Lotto Predictions - Java AI

Hello, we want to show you simple AI algorithm and how can he produce some lotto numbers for us.

We created small algorithm, load some numbers that happen before, do some calculations and print out the next 7 numbers winning combination.

First we need to have a way to represent this sequence of 7 numbers.
For example numbers: 37, 2, 11, 15, 14, 22, 1

What we can notice immediately is that we can sort them, it doesn't matter in witch order they arrived on screen, they will still represent combination of 7 numbers. So in our case it is: 1, 2, 11, 14, 15, 22, 37

We can create simple class for that.

Helper class:

public class Numbers {
   
    private final int num1;   private final int num2;   private final int num3;
    private final int num4;   private final int num5;   private final int num6;
    private final int num7;

    public Lotto(int num1, int num2, int num3, int num4, int num5, int num6, int num7) {
        this.num1= num1;   this.num2= num2;   this.num3= num3;
        this.num4= num4;   this.num5= num5;   this.num6= num6;
        this.num7= num7;
    }
    // some getters for this numbers
}
Now we can reuse this helper class and initialize some results we already know.

First we will create some List and some maps, in list we will collect all previous result so it would be easier for us to use them and maps will be created just to remember how many points each number have.

In our case point would be how many time he was in results from before.

Using static block we will populate result list and we can start processing.

Go over result list and populate maps with numbers.
Call print prediction that will go over maps and find best matches.

Take a look at the code:

Main class:

public class Lotto {
    // here we will store all results that we know in advance
    private static List<Lotto> results = new ArrayList<Lotto>();
   
    // we will use this maps to store info for number how many times he already were in results
    private static Map<Integer, Integer> number1 = new HashMap<>();
    private static Map<Integer, Integer> number2 = new HashMap<>();
    private static Map<Integer, Integer> number3 = new HashMap<>();
    private static Map<Integer, Integer> number4 = new HashMap<>();
    private static Map<Integer, Integer> number5 = new HashMap<>();
    private static Map<Integer, Integer> number6 = new HashMap<>();
    private static Map<Integer, Integer> number7 = new HashMap<>();
   
    static { // this will load some results that already were in lottery winners
        Numbers l1 = new Numbers (2, 7, 9, 13, 14, 29, 31);
        Numbers l2 = new Numbers (8, 14, 16, 22, 27, 29, 37);
        Numbers l3 = new Lotto(12, 17, 18, 19, 26, 35, 39);
        Numbers l4 = new Lotto(4, 6, 9, 10, 11, 18, 32);
        Numbers l5 = new Lotto(2, 3, 6, 7, 10, 15, 25);
        Numbers l6 = new Lotto(13, 21, 22, 28, 30, 32, 39);
        Numbers l7 = new Lotto(9, 12, 19, 22, 28, 36, 39);
        Numbers l8 = new Lotto(11, 15, 18, 22, 24, 36, 37);
        Numbers l9 = new Lotto(4, 8, 12, 18, 19, 24, 31);
        Numbers l10 = new Lotto(4, 9, 13, 14, 17, 37, 39);
        // add values to the list          
        results.add(l1);results.add(l2);results.add(l3);results.add(l4);results.add(l5);
        results.add(l6);results.add(l7);results.add(l8);results.add(l9);results.add(l10);
       
    }
   
    // our main program
    public static void main (String [] args) {
        for (Numbers l : results) {
            addNumber(l.getNum1(), number1); addNumber(l.getNum2(), number2);
            addNumber(l.getNum3(), number3); addNumber(l.getNum4(), number4);
            addNumber(l.getNum5(), number5); addNumber(l.getNum6(), number6);
            addNumber(l.getNum7(), number7);
        }
        printPrediction();
    }

    private static void printPrediction() {
        int n1Prediction = findNumber(number1);
        int n2Prediction = findNumber(number2);
        int n3Prediction = findNumber(number3);
        int n4Prediction = findNumber(number4);
        int n5Prediction = findNumber(number5);
        int n6Prediction = findNumber(number6);
        int n7Prediction = findNumber(number7);
       
        System.out.println("Prediction for new lotto result is:");
        System.out.print("Numbers: " + n1Prediction + ", " + n2Prediction
                        + ", " + n3Prediction + ", " + n4Prediction
                        + ", " + n5Prediction + ", " + n6Prediction
                        + ", " + n7Prediction);
    }
   
    // our magic goes here
    private static int findNumber(Map<Integer, Integer> map) {
        int number = -1;
        int value = -1;
        for (Map.Entry<Integer, Integer> entry : map.entrySet()) {
            if (entry.getValue() >= value) {
                number = entry.getKey();
                value = entry.getValue();
            }
        }
        return number;
    }

    // if value exist in map then remove it and add it once again with counter + 1
    private static void addNumber(int num, Map<Integer, Integer> map) {
        if (map.containsKey(num)) {
            int exist = map.get(num).intValue();
            map.remove(num);
            map.put(num, exist + 1);
        } else {
            map.put(num, 1);
        }
    }
   
}

After running this program we get this:
Prediction for new lotto result is:
Numbers: 4, 15, 9, 22, 30, 29, 39

Why did he find that results?

He was checking witch number is most popular to happen on that place and print out that one.
Our logic is fair simple, in order to create something "smarter" you will need better algorithm for this.

Add more results, change method print prediction, count more factors not just 1 and you should get better results, and at one point hit the jackpot!

Until then, please subscribe to our blog, post some comments, like us on Facebook, share it and enjoy.

Kind regards,
M.L.

Speed test: String vs StringBuilder in JAVA

We compare String with StringBuilder, run this code and see yourself, example:

public class SpeedTest
{
    public static void main(String[] args)
    {
        final String SAMPLE = "The Quick Brown Fox Jumps Over The Lazy Dog.";
        final int COUNT = 5000;

        // string
        String str = "";
        long start = System.nanoTime();
        for (int i = 0; i < COUNT; i++)
            str += SAMPLE;
        long strTotal = System.nanoTime() - start;
        if (str.length() == 123)
            System.exit(0);

        // StringBuilder
        StringBuilder builder = new StringBuilder(SAMPLE.length() * COUNT);
        start = System.nanoTime();
        for (int i = 0; i < COUNT; i++)
            builder.append(SAMPLE);
        long sbTotal = System.nanoTime() - start;

        System.out.println("String total time: " + (strTotal / 1000000.0)
                + " ms");
        System.out.println("StringBuilder total time: " + (sbTotal / 1000000.0)
                + " ms");
        System.out.println("StringBuilder vs. String: " + (strTotal / sbTotal));
    }

}

If this little "code" helped you, please subscribe, like us on facebook, share it, or do whatever you want with it

Have a good one. M.L.

Do you know how simple is programming? Try it yourself. AutoIT

You don't need to be IT expert to write a program, you can write your own programs with this script language:

 

AutoIT

There are a lot of complicated programming languages​​, but there are also simple language that everyone can use, one of them is AutoIT script language.

He is very simple and easy to learn. You can write simple and complicated programs for whatever you need.

How to start with AutoIT? You need to do 1. and 3. step on this link. After that you are ready to write your own programs.

I will show you how to make program to open your CD drive and close it in a loop every 1 minute. :D
We all wanted in some point to be a hackers, this is a closest you can be a hacker without knowing anything about programing.

So how to start? You can do like this, go to your desktop or folder you want to make programs and click right click, from menu select "New" then select AutoIT script. Name it like "CD Drive" or something like that. After you name it, you need to right click on it and click on Edit Script, by default if you just open it i will run script and nothing will be executed because you don't have any code on script.

So we click on Edit Script and now you see Script Editor, all you need to do now is to write your code and use your imagination. :)

We are building CD script, so what do we need? Script gonna be in a loop because we want that CD open's every 1 minute. So how to make a loop?

You can do a loop very easy and intuitive like this:

While 1=1

Wait! What? :D Yes this is a loop, if you think about it loop will do code while condition is correct, in our example 1 is always equal to 1 so our loop will do this always! :)

So how will the loop know where is the end of our code? We need to add this:

WEnd

W - represents while loop and End - end of the loop so every simple for now. :D

Hmm we want to do this loop every 60 second so we need to pause or "sleep" our program for 1 minute, how we gonna do that? Just add this:    sleep(time in millisecond)

So we need to our program sleeps for 60 second, 1 second has 1000 millisecond so we just add sleep method:

while 1=1

sleep(60000)

WEnd

We have our loop who will execute code in every minute in just 3 line of code's :D How cool is that? :)

Now we need to open a CD drive, you can say hmm that is hard, hmm no! Programing is simple because all you need to do is to call method who will do something that we need, so we need method to get CD Drive.

$var = DriveGetDrive( "CDROM" ) 

In this variable called "$var" we get all CD drives on computer, if you think what is this "$" sign means, that is AutoIT thing to say what is variable, you don't need to know anything about that...

So we have all drives in one variable, now we need to open it, so we need to iterate through all cd drive's and open it. We will do it like this:

If not @error Then
For $i = 1 to $var[0]
    CDTray($var[$i] , "open")
Next
EndIf

We first ask is there some kind of error in calling CD Drive's? If not we use for loop to iterate through all CD drives, so if we have 3 drives, with for we go from 1 to 3, we now use 1drive call method to open it: CDTray($var[$i] , "open")When we are finished with first drive we call method Next it will give us next drive, so for loop will now do same thing with second drive, after second is finished we call Next and call it for third drive. So with that 5 lines of codes we open all CD drives on computer. Our code look like this now:

While 1=1

$var = DriveGetDrive( "CDROM" )
If not @error Then
For $i = 1 to $var[0]
    CDTray($var[$i] , "open")
Next
EndIf

sleep(60000)

WEnd

And we finish it :D If you want to close it and after a few second you can use that same code but change "open" to "close" for operation and add sleep between open and close about 20-30 second and you are good. :D

Now we need to create executive program that we can send someone to make a joke with him. :)
In Script Editor menu you have Tools tab, open it and click "Build". That will call AutoIT function to make our program become executive or .exe file. If you don't have any mistakes with your code in your folder or desktop where did you create this script will be file NameOfTheScript.exe and all you need to do now is to zip it or rar it and send it to someone you want to go insane. :P

You can run it on your computer as well, if you want to stop it just use Ctrl+Alt+Delete and kill the program... :) 

This is a tutorial how to make CD Room open's with 10 lines of code and you don't need to be programer to do that. 

If you want to learn more try to read AutoIT documentation or just leave comment bellow and we will make new tutorial how to do similar crazy stuff with AutoIT... :)

If you like this post please like us on Facebook, subscribe, share it, do whatever you want with it... :)
Have a good one. M.L.

Best algorithms for sorting arrays - Java

Bubble sort, Insertion sort and Selection sort

Which one you will use depends on what do you need. Bubble sort is a simplest algorithm, it will do the job but he will be slow, if you need something faster try Selection Sort and Insertion Sort.

They use different methods of sorting if you want to know how they works read it on this links:

Insertion Sort

Selection Sort

Bubble Sort

My example of implementation this 3 algorithm's, I add speed test so you will see results which one is the best.

Notice: If you are using algorithms for different things, test it in all 3 algorithms it can give different results.

public class Example {

    public static void insertion_sort (int array[]) {
        long start = System.nanoTime();
        for (int i = 1; i < array.length; i++) {
            int j = i;
            int B = array[i];
            while ((j > 0) && (array[j-1] > B)) {
                array[j] = array[j-1];
                j--;
            }
            array[j] = B;
        }
        long total = System.nanoTime() - start;
        System.out.println("Time needed for sorting: "
                + (total / 1000000.0));
    }

    public static void selection_sort (int array[]) {
        long start = System.nanoTime();
        for (int x = 0; x < array.length; x++) {
            int index_of_min = x;
            for (int y = x; y < array.length; y++) {
                if (array[index_of_min] < array[y]) {
                    index_of_min = y;
                }
            }
            int temp = array[x];
            array[x] = array[index_of_min];
            array[index_of_min] = temp;
        }
        long total = System.nanoTime() - start;
        System.out.println("Time needed for sorting: "
                + (total / 1000000.0));
    }


    public static void bubble_sort( int a[] ) {
        long start = System.nanoTime();
        int i, j,t=0;
        for (i = 0; i < a.length; i++) {
            for (j = 1; j < (a.length-i); j++) {
                if (a[j-1] > a[j]){
                    t = a[j-1];
                    a[j-1] = a[j];
                    a[j] = t;
                }
            }
        }
        long total = System.nanoTime() - start;
        System.out.println("Time needed for sorting: "
                + (total / 1000000.0));
    }
   
   
    public static void main (String [] args) {
        int i;
        int array[] = {12,9,3,5,7,9,11,17,22,15,4,99,120,1,3,10};
        System.out.println();
        bubble_sort(array);
        System.out.print("After bubble sort algorithm:\n");
        for(i = 0; i <array.length; i++)
        System.out.print(array[i]+"  ");
        System.out.println();
       
        int p;
        int array2[] = {12,9,3,5,7,9,11,17,22,15,4,99,120,1,3,10};
        System.out.println();
        selection_sort(array2);
        System.out.print("After selection sort algorithm:\n");
        for(p = 0; p < array2.length; p++)
        System.out.print(array2[p]+"  ");
        System.out.println();
       
        int c;
        int array3[] = {12,9,3,5,7,9,11,17,22,15,4,99,120,1,3,10};
        System.out.println();
        insertion_sort(array3);
        System.out.print("After insertion sort algorithm:\n");
        for(c = 0; c < array3.length; c++)
        System.out.print(array3[c]+"  ");
        System.out.println();

    }
}

If you see this as useful please subscribe, like it, share it do whatever you want with it.
Have a good one. M.L.

Component Based Development - CBD - Java EJB 3.1 - Example

Blog platform in EJB 3.1

Assignment!
We need to create EJB layer for a blog site.

Clients communicate with stateful session bean. It is necessary to implement the method for search blogs and method for setting up a new blog.
In the case of passivation of the stateful session bean , we need just before passivation to print a message on the console about session bean is going to be pasive.
Singleton bean keeps customer information (name , username , password ... ) and data on blogs ( text, date , number of like- s) in ArrayList.
Singleton is NOT instantiated immediately upon deployment, but by the first call. By instantiate initialize ArrayList in which data need to be stored.
If we call the method that is used to search, interceptor intercepts that method and he update statistics (number of views for each blog).
Call method to set up a new blog interceptor intercepts that method and he update statistics on the number of blogs set up during the day
The statistic data is stored in the same Singleton which are stored and other information .
All interceptor's is required to be implemented in a separate class.
It is necessary to implement a timer that starting from 1.1.2014 . Every day at 00:00 timer need to print on console how many visit blog's have that day.

Please share this post if you like it.

Singleton Class

import java.util.ArrayList;
import java.util.Date;
import javax.ejb.LocalBean;
import javax.ejb.Singleton;

/**
 * Developed by codeMaker
 */
@Singleton
@LocalBean
public class Baza implements BazaLocal {

    public ArrayList<Klijent> listaKlijenata = new ArrayList<Klijent>();
    public ArrayList<Blog> listaBlogova = new ArrayList<Blog>();
   
    int brojPB = 0;
   
    public int getBrojPB() {
        return brojPB;
    }
    public void setBrojPB(int brojPB) {
        this.brojPB = brojPB;
    }
    public void setListaBlogova(ArrayList<Blog> listaBlogova) {
        this.listaBlogova = listaBlogova;
    }
    public void setListaKlijenata(ArrayList<Klijent> listaKlijenata) {
        this.listaKlijenata = listaKlijenata;
    }
    public ArrayList<Klijent> getListaKlijenata() {
        return listaKlijenata;
    }
    public ArrayList<Blog> getListaBlogova() {
        return listaBlogova;
    }
    public Baza() {
        // TODO Auto-generated constructor stub
        Klijent klijent = new Klijent("Niki", "Re", "user", "pass");
        listaKlijenata.add(klijent);
        Blog blog = new Blog("tekst", new Date());
        listaBlogova.add(blog);
    }
}

SingletonLocal interface

import java.util.ArrayList;
import javax.ejb.Local;

@Local
public interface BazaLocal {
    ArrayList<Klijent> getListaKlijenata();
    ArrayList<Blog> getListaBlogova();
    void setListaBlogova(ArrayList<Blog> lista);
    void setListaKlijenata(ArrayList<Klijent> lista);
    int getBrojPB();
    void setBrojPB(int brojPB);
}

Klijent class

import java.util.ArrayList;

public class Klijent {

    public String ime;
    public String prezime;
    public String username;
    public String pass;
   
    public ArrayList<Blog> listaBlogova;
   
    public Klijent(String ime, String prezime, String username, String pass) {
        this.ime = ime;
        this.prezime = prezime;
        this.username = username;
        this.pass = pass;
        listaBlogova = new ArrayList<Blog>();
    }

    public String getIme() {
        return ime;
    }
    public void setIme(String ime) {
        this.ime = ime;
    }
    public String getPrezime() {
        return prezime;
    }
    public void setPrezime(String prezime) {
        this.prezime = prezime;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPass() {
        return pass;
    }
    public void setPass(String pass) {
        this.pass = pass;
    }
    public ArrayList<Blog> getListaBlogova() {
        return listaBlogova;
    }
    public void setListaBlogova(ArrayList<Blog> listaBlogova) {
        this.listaBlogova = listaBlogova;
    }      
}


Blog class

import java.util.Date;

public class Blog {
  
    public String tekst;
    public Date datum;
    public int brojLajkova;
    public int brojPregleda;
   
    public Blog(String tekst, Date datum) {
        this.tekst = tekst;
        this.datum = datum;
        brojLajkova = 0;
        brojPregleda = 0;
    }
    public String getTekst() {
        return tekst;
    }
    public void setTekst(String tekst) {
        this.tekst = tekst;
    }
    public Date getDatum() {
        return datum;
    }
    public void setDatum(Date datum) {
        this.datum = datum;
    }
    public int getBrojLajkova() {
        return brojLajkova;
    }
    public void setBrojLajkova(int brojLajkova) {
        this.brojLajkova = brojLajkova;
    }
    public int getBrojPregleda() {
        return brojPregleda;
    }
    public void setBrojPregleda(int brojPregleda) {
        this.brojPregleda = brojPregleda;
    }

Stateful bean Blogovanje - Clients communicate with him

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import javax.ejb.EJB;
import javax.ejb.LocalBean;
import javax.ejb.PrePassivate;
import javax.ejb.Stateful;
import javax.interceptor.Interceptors;

@Stateful
@LocalBean
public class Blogovanje implements BlogovanjeRemote {
   
    @EJB BazaLocal baza;
   
    public Blogovanje() {
        
    }
   
    @Interceptors(PretragaInterceptor.class)
    public String pretraga(String upit) {
        List<Blog> lista = baza.getListaBlogova();
        for (Blog b : lista) {
            String tekst = b.getTekst();
            if (tekst.equalsIgnoreCase(upit)) {
                return "Blog je pronadjen!";
            }
        }
        return "Blog nije pronadjen.";
    }
   
    @Interceptors(PretragaInterceptor.class)
    public String postaviBlog(String username, String pass, String tekstBloga) {
       
        int uspjeh = 0;
        ArrayList<Klijent> lista = baza.getListaKlijenata();
        for(Klijent k : lista) {
            String user = k.getUsername();
            String p = k.getPass();
            if((username.equalsIgnoreCase(user)) && (pass.equalsIgnoreCase(p))) {
                Blog b = new Blog(tekstBloga, new Date());
                ArrayList<Blog> listaBlogova = baza.getListaBlogova();
                listaBlogova.add(b);
                baza.setListaBlogova(listaBlogova);
                k.getListaBlogova().add(b);
                uspjeh++;
            }
        }
        baza.setListaKlijenata(lista);
        if (uspjeh > 0) {
            return "Uspeh";
        } else {
            return "Nismo uspjeli da postavimo blog, user i pass ne odgovaraju!";
        }
    }
   
    @PrePassivate
    public void prijePasiviziranja() {
        System.out.println("Jagoda u supermarketu.");
    }
}

BlogovanjeRemote interface - For session bean
Methods in this class will be visible for clients

import javax.ejb.Remote;

@Remote
public interface BlogovanjeRemote {
    String pretraga(String upit);
    String postaviBlog(String username, String pass, String tekstBloga);
}


Interceptors in one class you can build it in seperate classes.

import java.util.ArrayList;
import java.util.List;
import javax.ejb.EJB;
import javax.interceptor.AroundInvoke;
import javax.interceptor.InvocationContext;

public class PretragaInterceptor {
   
    @EJB BazaLocal baza;
   
    @AroundInvoke
    public Object brojPregledaStatistika(InvocationContext ic) throws Exception {
       
        String imeMetoda = ic.getMethod().getName();
       
        if (imeMetoda.equalsIgnoreCase("pretraga")) {
        Object [] listaO = ic.getParameters();
        String upit = (String) listaO[0];
       
        List<Blog> lista = baza.getListaBlogova();
        for (Blog b : lista) {
            String tekst = b.getTekst();
            if (tekst.equalsIgnoreCase(upit)) {
                b.setBrojPregleda(b.getBrojPregleda() + 1);
            }
        }
       
        return ic.proceed();
        }
       
        if (imeMetoda.equalsIgnoreCase("postaviBlog")) {
           
            Object [] listaO = ic.getParameters();
            String username = (String) listaO[0];
            String pass = (String) listaO[1];
           
            ArrayList<Klijent> lista = baza.getListaKlijenata();
            for(Klijent k : lista) {
                String user = k.getUsername();
                String p = k.getPass();
                if((username.equalsIgnoreCase(user)) && (pass.equalsIgnoreCase(p))) {
                    baza.setBrojPB(baza.getBrojPB() + 1);
                }
            }
            return ic.proceed();
        }
        return ic.proceed();
    }   
}

Timer class

import java.text.SimpleDateFormat;
import java.util.Date;
import javax.annotation.PostConstruct;
import javax.annotation.Resource;
import javax.ejb.EJB;
import javax.ejb.LocalBean;
import javax.ejb.Singleton;
import javax.ejb.Startup;
import javax.ejb.Timeout;
import javax.ejb.TimerService;

@Startup
@Singleton
@LocalBean
public class IspisTimer {

    @EJB BazaLocal baza;
    @Resource TimerService ts;
   
    @Timeout
    public void ispsi() {
        System.out.println("Danas je postavljeno: " + baza.getBrojPB() + " blogova!");
        baza.setBrojPB(0);
    }
   
    @PostConstruct
    public void startuj(){
        SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy HH:mm");
        Date date = null;
        try {
            date = sdf.parse("31-12-2013 23:59");
        } catch (Exception e) {    }
        ts.createTimer(date, 86400000, null);
    }
}


And Klijent app, so we can test it.

import java.util.Hashtable;
import java.util.Properties;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import binovi.Blogovanje;
import binovi.BlogovanjeRemote;

public class Klijent {

    static Context initialContext;

    public static void main(String[] args) {
        try {
            Context context = getInitialContext();
            String name = getLookUpName();
            BlogovanjeRemote bean = (BlogovanjeRemote) context.lookup(name);
            System.out.println();
            System.out.println(bean.postaviBlog("user", "pass", "text"));
            System.out.println(bean.postaviBlog("ssa2", "agawa", "text"));
            System.out.println(bean.pretraga("text"));

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static String getLookUpName() {

        String appName = "";
        String moduleName = "Blogovanje";
        String distinctName = "";
        String beanName = Blogovanje.class.getSimpleName();
        String interfaceName = BlogovanjeRemote.class.getName();

        String name = "ejb:" + appName + "/" + moduleName + "/" + distinctName
                + "/" + beanName + "!" + interfaceName+"?stateful";

        System.out.println(name);

        return name;
    }

    public static Context getInitialContext() {
           if (initialContext == null) {
            try {
                final Hashtable jndiProperties = new Hashtable();
                jndiProperties.put(Context.URL_PKG_PREFIXES,
                        "org.jboss.ejb.client.naming");
                initialContext = new InitialContext(jndiProperties);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return initialContext;
    }
}

If you have any questions or need help with coding post a comment bellow.
Please share this post if you like it.

Fast screen capture in Java - Example

 Read pixels from screen in Java

If you want to fast read pixels from screen you will need Java class called Robot.

The main purpose of class Robot is to generate native system inputs (mouse, keyboard inputs) for the purpose of test automation. 

If you need to read pixels from screen you can use Robot method called getPixelColor(int x, int y) x and y represents coordinates of pixels you want to grab. Method getPixelColor(...) returns object Color so if you need to now RGB you must use color.getBlue(), color.getGreen(), color.getRed();

This method is good if you want to read 2-3 pixels but if you need to reed a 10x10 pixels from screen i don't recommend using it. Main reason is because getPixelColor is slow, first you read pixel that you create object Color and then you can work with that pixel.

If you want to read 10x10 pixels from screen or more you can use Robot's method called createScreenCapture(Rectangle r); that method returns BufferedImage. First you may think why is he taking Rectangle and returns a image? Method createScreenCapture(...) need to know from which coordinates he must start (x,y) and how much weight and height go right and down.

So you get something like this:

Robot robot = new Robot();

BufferedImage image = robot.createScreenCapture(new Rectangle(100, 100, 10, 10));

So you can easy capture 10x10 pixels from screen in one line of code, if you want to use getPixelColor in a loop to do that you will need 2 or 3 second for that. (that's a lot!!!)

When you have BufferedImage you can easy save it like "bmp":

ImageIO.write(image, "bmp", new File("Image.bmp"));

If you want to work with pixels you get in BufferedImage you can do it like this:
boolean fail = false;
for (int x = 0; !fail  && x < image.getHeight();  x++) {
                for (int y = 0; !fail  &&  y < image.getWidth(); y++) {
                    if ( image.getRGB(x, y) != color.getRGB() ) {
                        System.out.println("Pixels are different stop!");
                        fail = true;
                        }
                    }
           }
}
color.getRGB() returns just one color if you need to check are two pictures the same you can use:
if ( image.getRGB(x, y) != image2.getRGB(x, y) 
So if pixels on x, y position on image and image2 are different we stop and write message for that, if we don't get that message fail will stay on false and we can after all this add this:
if (!fail) {
  System.out.println("Pictures are equal!");
}

Robot is powerful class, you can click mouse, keyboard or read pixels from screen.
If you want to learn more about Robot class you can read Java documentation on this link.

If you have any questions or need help with coding post a comment bellow.
And if you like this post please share it. :)

IS2 - JSP Pages and Servlet - Examples

Napomena!
JSP stranice zbog ustede na prostoru ubacicemo samo tag "body", jedan primjer zaglavlja i kod nece biti fino formatiran

Iz servleta cemo izbaciti import i dio generickog koda

Primjeri za JSTL biblioteku, "Core Tags" mi koristimo...

Zaglavlje JSP stranica...

If you want to translate this code to HTML 5 you need to write Docture type like this <!DOCTYPE html> 

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1" %>
    <%@ page isELIgnored="false"  %>
    <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>

ZADUZENJE CLANA JSP

 <body>
<c:if test="${!empty clan}">
<form action="/library/GetSlobodniPrimerciZaNaslov">
<table>
<tr><td>Clanski broj:</td><td>${clan.clanskiBroj}</td></tr>
<tr><td>Ime:</td><td>${clan.ime}</td></tr>
<tr><td>Prezime:</td><td>${clan.prezime}</td></tr>
<tr><td>Kategorija:</td><td>${clan.kategorija.nazivkategorije}</td></tr>
</table>
<br><br><br>
Naslov knjige za zaduzenje: <input name="naslovFind" type="text"> <input type="submit" value="Nadji">
</form>
<c:if test="${!empty primerci}">
<table>
<thead><td>Naslov</td><td>Autor</td><td>Godina izdanja</td><td>Inventarni broj</td><td>Zaduzi</td></thead>
<c:forEach var="primerak" items="${primerci}">
<tr><td>${primerak.knjiga.naslov}</td><td>${primerak.knjiga.autor}</td><td>${primerak.knjiga.godinaIzdanja}</td>
<td>${primerak.invBroj}</td><td><a href="/library/ZaduziClana?invBroj=${primerak.invBroj}">Zaduzi</a></td></tr>
</c:forEach </table> </c:if> </c:if> </body>

RAZDUZI CLANA JSP

<body>
<c:if test="${!empty clan}">
<table>
<tr><td>Clanski broj:</td><td>${clan.clanskiBroj}</td></tr>
<tr><td>Ime:</td><td>${clan.ime}</td></tr>
<tr><td>Prezime:</td><td>${clan.prezime}</td></tr>
<tr><td>Kategorija:</td><td>${clan.kategorija.nazivkategorije}</td></tr>
</table> <br> Nerazduzena zaduzenja <br><br>
<table border=1>
<thead><td>Datum zaduzenja</td><td>Inventarni broj</td><td>Naslov knjige</td></thead>
<c:forEach var="zaduzenje" items="${clan.zaduzenjes}" >
<c:if test="${empty zaduzenje.datumVracanja}">
<tr><td>${zaduzenje.datumZaduzenja}</td><td>${zaduzenje.primerak.invBroj}</td>
<td>${zaduzenje.primerak.knjiga.naslov}</td><td><a href="/library/RazduziClana?idZad=${zaduzenje.id}">Razduzi</a></td></tr>
</c:if> </c:forEach> </table> </c:if> </body>

FIND CLANA JSP

<body>
<form action="/library/ReturnClanForClanskiBroj?action=zaduzi" method="post">
Clanski broj: <input name="clanskiBroj" type="text">
<input type="submit">
</form> </body>

SHOW SVE KNJIGE JSP

<body>
<table border=1>
<thead><td>Naslov</td><td>Autor</td><td>Izdavac</td><td>Godina</td></thead>
<c:forEach var="knjiga" items="${sveKnjige}">
<tr><td>${knjiga.naslov}</td>
    <td>${knjiga.autor}</td>
    <td>${knjiga.izdavac}</td>
    <td>${knjiga.godinaIzdanja}</td></tr>
</c:forEach> </table> </body>

PRINT MESSAGE JSP

<html> <head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head> <body>
${poruka}
</body> </html>

SHOW ZADUZENJA JSP

<body> <table>
    <tr><td>ID Clana</td><td><input value="${clbroj}" name="id2" type="text"></td></tr>
    <tr><td>Ime</td><td><input value="${ime}" name="ime" type="text"></td></tr>
    <tr><td>Prezime</td><td><input value="${prz}" name="prezime" type="text"></td></tr>
</table> ${poruka} <table>
    <tr><td>Inv. Broj</td><td>Naslov</td><td>Autor</td><td>Razduzi</td><tr>
    <c:forEach var="zad" items="${zaduzenja}">
    <tr><td><div>${zad.primerak.invBroj}</div></td><td><div>${zad.primerak.knjiga.naslov}</div></td><td><div>${zad.primerak.knjiga.autor}</div></td><td><a href="/library/RazduziClana?id=${zad.id}">Link</a></td><tr>
    </c:forEach> </table> </body>

SERVLET

GET SVE KNJIGE / GET BOOKS

@WebServlet("/GetSveKnjigeServlet")

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        KnjigaManager kmg = new KnjigaManager();
        List<Knjiga> sveKnjige = kmg.listKnjige();
        request.setAttribute("sveKnjige", sveKnjige);
        RequestDispatcher rd = getServletContext().getRequestDispatcher("/izvestaji/prikaziSveKnjige.jsp");
        rd.forward(request, response);       
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

RAZDUZI CLANA

@WebServlet("/RazduziClana")

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String idZaduzenja = request.getParameter("idZad");
        ZaduzenjeManager zm = new ZaduzenjeManager();
        Zaduzenje z = zm.getZaduzenjeForId(Integer.parseInt(idZaduzenja));       
        boolean ok = zm.razduziZaduzenje(z);
        ClanManager cmg = new ClanManager();
        Clan clan = cmg.getClanAndZaduzenjesForId(z.getClan().getClanskiBroj());
        request.setAttribute("clan", clan);
        RequestDispatcher rd = getServletContext().getRequestDispatcher("/zaduzenja/RazduzivanjeClana.jsp");
        rd.forward(request, response);
  }



SNIMANJE CLANA / SAVE CLAN (USER)

 @WebServlet("/SnimanjeClanaServlet")

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String clanskiBroj = request.getParameter("clanskiBroj");
        String ime = request.getParameter("ime");
        String prezime = request.getParameter("prezime");
        String adresa = request.getParameter("adresa");
        //datumi
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String datumRodjenjaStr = request.getParameter("datumRodjenja");
        String datumUpisaStr = request.getParameter("datumUpisa");
        String idKategorije = request.getParameter("kategorija");
        KategorijaManager kmg = (KategorijaManager)request.getSession().getAttribute("kategorijaManager");
           String poruka;
            try {
            Date datumRodjenja = sdf.parse(datumRodjenjaStr);
            Date datumUpisa = sdf.parse(datumUpisaStr);
            ClanManager cmg = new ClanManager();
            Kategorija kat = kmg.getKategorijaForId(Integer.parseInt(idKategorije));
            boolean ok = cmg.saveClan(Integer.parseInt(clanskiBroj), ime, prezime, adresa, datumRodjenja, datumUpisa, kat);
            if(ok)
                poruka = "Clan je uspesno sacuvan.";
            else
                poruka = "Doslo je do greske. Clan nije sacuvan.";           
          } catch (ParseException e) {
            poruka="Clan nije sacuvan. Neispravan format datuma.";
        }catch(NumberFormatException ex){
            poruka = "Clan nije sacuvan. Neispravan format broja.";
        }
        request.setAttribute("poruka", poruka);
        RequestDispatcher rd = getServletContext().getRequestDispatcher("/unos/unosClana.jsp");
        rd.forward(request, response);
    }

SNIMANJE KNJIGE / SAVE BOOK IN DATABASE

@WebServlet("/SnimanjeKnjigeServlet")

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String idKnjige = request.getParameter("idKnjige");
        String naslov = request.getParameter("naslov");
        String autor = request.getParameter("autor");       
        String izdavac = request.getParameter("izdavac");
        String godinaIzdanja = request.getParameter("godinaIzdanja");
        KnjigaManager kmg = new KnjigaManager();
        Knjiga k = kmg.createAndStoreKnjiga(Integer.parseInt(idKnjige), naslov, autor, godinaIzdanja, izdavac);       
        String forwardPageURL= "/unos/unosKnjigeJSP.jsp";;
        if(k!=null){
            request.setAttribute("poruka", "Knjiga je uspesno sacuvana.");           
          }else{           
            request.setAttribute("poruka","Doslo je do greske, knjiga nije sacuvana.");
          }
         RequestDispatcher rd = getServletContext().getRequestDispatcher(forwardPageURL);
        rd.forward(request, response);   
        }

UNOS PRIMJERKA / INSERT NEW COPY OF SINGLE BOOK

@WebServlet("/UnesiPrimjerak")

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String broj = request.getParameter("broj");
        int idK = (int) request.getSession().getAttribute("idKnjige");
        int br = Integer.parseInt(broj);
        KnjigaManager k = new KnjigaManager();
        List p = k.addPrimeraks(idK, br);
        String poruka = "";
        if (p.size() > 0) {
            poruka = "Success...";
        }
        else {
            poruka = "Error";
        }
        request.setAttribute("poruka", poruka);
        request.setAttribute("lista", p);
        request.setAttribute("brojInv", p.size());
        RequestDispatcher rd = getServletContext().getRequestDispatcher("/UnosPodataka/Izvjestaj.jsp");
        rd.forward(request, response);
    }

NOVI KOD

 JavaBEAN - Vraca sve kategorije / GET ALL CATEGORIES

public class SveKategorijeBean  {
    private List<Kategorija> sveKategorije = null;
    public SveKategorijeBean() {
        try {
            Session session = HibernateUtil.getSessionFactory().getCurrentSession();
            session.beginTransaction();
            sveKategorije = session.createQuery("from Kategorija").list();
            session.getTransaction().commit();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }    public List<Kategorija> getSveKategorije() {
        return sveKategorije;
    } public void setSveKategorije(List<Kategorija> sveKategorije) {
        this.sveKategorije = sveKategorije;
    }
}

PRIMJER HTML - 5 Komponenta za DATUM ujedno i UNOS CLANA JSP stranica, Poziv SveKateforijeBEAN klasa koju smo napravili da bi njenim pozivom vec iz baze izvadili sve kategorije...
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Unos Clana</title>
</head>
<jsp:useBean id="sveKategorije" class="rs.ac.uns.dmi.is2.managers.SveKategorijeBean" scope="session"></jsp:useBean>
<body>
<form action="../SnimajClana" method="post">
<table>
    <tr><td>Ime</td><td><input name="ime" type="text"></td></tr>
    <tr><td>Prezime</td><td><input name="prezime" type="text"></td></tr>
    <tr><td>Adresa</td><td><input name="adresa" type="text"></td></tr>
    <tr><td>Kategorija</td>
        <td><select name="Kategorije">
        <c:forEach items="${sveKategorije.sveKategorije}" var="kat">
        <option value="${kat.idkategorije}">${kat.nazivkategorije} </option>
        </c:forEach>
        </select></td></tr>
    <tr><td>Datum upisa</td><td><input type="date" name="datumUpisa"></input> </td></tr>
    <tr><td>Datum rodjenja</td><td><input type="date" name="datumRodjenja"></input> </td></tr>
</table>
<input type="submit" value="Sacuvaj">
</form> ${poruka} </body> </html>


 INSERT NEW BOOK JSP

<body>
<form action="../SnimanjeKnjige" method="post">
    <table> <tr>
    <td>Naslov</td><td><input name="naslov" type="text"></td></tr>
    <tr><td>Autor</td><td><input name="autor" type="text"></td></tr>
    <tr><td>Izdavac</td><td><input name="izdavac" type="text"></td></tr>
    <tr><td>Godina Izdanja</td><td><input name="godinaIzdanja" type="text"></td></tr>
    </table>    <input type="submit" value="Sacuvaj">
</form> </body>

 SERVLET

AZURIRAJ CLANA Servlet

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String idString = request.getParameter("id");
        int id = Integer.parseInt(idString);
        ClanManager cr = new ClanManager();
        Clan c = cr.getClan(id);
        request.setAttribute("clbroj", id);
        request.setAttribute("clan", c);
        RequestDispatcher rd = getServletContext().getRequestDispatcher("/UnosPodataka/AzurirajClana.jsp");
        rd.forward(request, response);
    }

Example using SESSION! // EXAMPLE HOW TO USE SESSION

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String idString = request.getParameter("id");
        int clBr = Integer.parseInt(idString);
        ClanManager cm = new ClanManager();
        List<Zaduzenje> lista = cm.getNerazduzenaZaClanskiBroj(clBr);
        Clan c = cm.getClan(clBr);
        request.getSession().setAttribute("clbroj", clBr);
        request.getSession().setAttribute("ime", c.getIme());
        request.getSession().setAttribute("prz", c.getPrezime());   
        request.setAttribute("zaduzenja", lista);
        RequestDispatcher rd = getServletContext().getRequestDispatcher("/UnosPodataka/PrikazZaduzenja.jsp");
        rd.forward(request, response);     
    }

UPDATA CLANA // UPDATE USER

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String cl = request.getParameter("id2");
        int clanskiBroj = Integer.parseInt(cl);
        String Ime = request.getParameter("ime");
        String Prezime = request.getParameter("prezime");
        String Adresa = request.getParameter("adresa");
        String kat = request.getParameter("Kategorije");
        int br = Integer.parseInt(kat);
        String datumcic = request.getParameter("datumRodjenja");
        System.out.println(datumcic);
        Date datum1 = null;
        try {
            datum1 = sdf.parse(datumcic);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        ClanManager cc = new ClanManager();
        Kategorija kategorija = cc.getKategorija(br);
        int rez = cc.updateClan(clanskiBroj, Ime, Prezime, Adresa, kategorija, datum1);
        String poruka = "";
        if (rez == 0) {
            poruka = "Clan nije updejtovan";
        }
        else {
            poruka = "Clan je updejtovan!";
        }
        request.setAttribute("poruka", poruka);
        RequestDispatcher rd = getServletContext().getRequestDispatcher("/UnosPodataka/AzurirajClana.jsp");
        rd.forward(request, response);
    }


COMBO BOX!!! Profesorica je rekla da moze da dodje nesto da moramo da stavimo npr. da je nesto oznaceno u Combo Box-u i evo jedan primjer JSP stranice koja to radi...
Pitamo da li je to sto nama treba ako jeste postavi ga na selected.

<body>
<form action="/library/AzurirajClana" method="post">
<table>
<tr><td>ID Clana</td><td><input name="id" type="text"></td></tr>
</table>
<input type="submit" value="Uzmi Clana">
</form>
<form action="/library/UpdateClana" method="post">
<table>
    <tr><td>ID Clana</td><td><input value="${clbroj}" name="id2" type="text"></td></tr>
    <tr><td>Ime</td><td><input value="${clan.ime }" name="ime" type="text"></td></tr>
    <tr><td>Prezime</td><td><input value="${clan.prezime }" name="prezime" type="text"></td></tr>
    <tr><td>Adresa</td><td><input value="${clan.adresa }" name="adresa" type="text"></td></tr>
    <tr><td>Kategorija</td>
        <td><select name="Kategorije">
        <c:forEach items="${sveKategorije.sveKategorije}" var="kat">
        <c:choose>
              <c:when test="${clan.kategorija.idkategorije == kat.idkategorije}">
                <option selected="selected" value="${kat.idkategorije}">${kat.nazivkategorije} </option>
              </c:when>
              <c:otherwise>
                  <option value="${kat.idkategorije}">${kat.nazivkategorije} </option>
              </c:otherwise>
        </c:choose>
        </c:forEach>
        </select></td></tr>
    <tr><td>Datum upisa</td><td><input value="${clan.datumUpisa}" type="date" name="datumUpisa"></input> </td></tr>
    <tr><td>Datum rodjenja</td><td><input value="${clan.datumRodjenja}" type="date" name="datumRodjenja"></input> </td></tr>
</table>
<input type="submit" value="Sacuvajte Clana">
</form>
${poruka}
</body>




Novi DIO



<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1" isELIgnored="false"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="/library/GetZaduzenje?by=invBroj">
<input type="text" name="invBroj">
<input type="submit" value="Ucitaj">
</form>
<c:if test="${!empty zaduzenja}">
<table border=1>
<thead><td>Datum zaduzenja</td><td>Inventarni broj</td><td>Naslov</td><td>Ime i prezime</td></thead>
<c:forEach var="zad" items="${zaduzenja}">
<tr><td>${zad.datumZaduzenja}</td><td>${zad.primerak.invBroj}</td><td>${zad.primerak.knjiga.naslov}</td>
<td>${zad.clan.ime} ${zad.clan.prezime}</td></tr>
</c:forEach>
</table>
<br><br>
<form action="/library/RazduziZaduzenja">
<input type="text" name="datumRazduzenja" value='<fmt:formatDate pattern="yyyy-MM-dd" value="<%= new java.util.Date() %>"/>'>
<input type="submit" value="Razduzi">
</form>
</c:if>
</body>
</html>


JOS JEDAN


<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1" isELIgnored="false"%>
 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
 <jsp:useBean id="kategorijaManager" class="rs.ac.uns.dmi.is2.manager.KategorijaManager" scope="session"/>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="/library/ReturnClanForClanskiBroj?action=promenaKategorije" method="post">
Clanski broj: <input name="clanskiBroj" type="text">
<input type="submit" value="Nadji clana">
</form>
Selektovani clanovi: <br><br>
<table border=1>
<thead><td>Ime</td><td>Prezime</td><td>Kategorija</td></thead>
<c:forEach var="clan" items="${clanovi}">
<tr><td>${clan.ime}</td><td>${clan.prezime}</td><td>${clan.kategorija.nazivkategorije}</td></tr>
</c:forEach>
</table>
<br>
Nova kategorija: <br>
<form action="/library/PromenaKategorija">
<select name="kategorija">
<c:forEach var="kat" items="${kategorijaManager.sveKategorije}">
<option value="${kat.idkategorije}" >${kat.nazivkategorije}</option>
</c:forEach>
</select>
<input type="submit" value="Promeni">
</form>

</body>
</html>


JOS JEDAN


<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>  
<%@ page isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Sve knjige</title>
</head>
<body>
<table border=1>
<thead><td>Naslov</td><td>Autor</td><td>Izdavac</td><td>Godina</td></thead>
<c:forEach var="knjiga" items="${sveKnjige}">
<tr><td>${knjiga.naslov}</td>
<td>${knjiga.autor}</td>
<td>${knjiga.izdavac}</td>
<td>${knjiga.godinaIzdanja}</td></tr>
</c:forEach>
</table>
</body>
</html>

NOVI


<%@ page isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<body>
Primerci:<br>
<c:forEach var="primerak" items="${knjiga.primeraks}">
${primerak.invBroj}<br>

</c:forEach>

</body>
</html>

UNOS PRIMJERKA


<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ page isELIgnored="false" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Unos primeraka knjige</title>
</head>
<body>
${message}
<table>
<tr><td>Naslov:</td><td>${knjiga.naslov}</td></tr>
<tr><td>Autor:</td><td>${knjiga.autor}</td></tr>
<tr><td>Izdavanje:</td><td>${knjiga.izdavac} (${knjiga.godinaIzdanja})</td></tr>
</table>
<br>

<form action="/library/DodajPrimerakKnjiga" method="post">
Dodaj primerak <br><br>
Inventarni broj <input name="invBroj" type="text">
<input type="submit" value="Dodaj">
</form>
<br><br>
<%@ include file="../izvestaji/prikaziPrimerkeKnjige.jsp" %>
</body>
</html>

NADJI CLANA



<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1" isELIgnored="false"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="/library/ReturnClanForClanskiBroj?action=${param.action}" method="post">
Clanski broj: <input name="clanskiBroj" type="text">
<input type="submit">
</form>

</body>
</html>


Servlet for Jasper reports!

// This is a list of values that I want to send to servlet
List<Radnik> radnici = RadnikManager.getSviRadnici();
        HashMap<String, Object> params = new HashMap<String, Object>();
        ServletContext context = this.getServletContext();       
        String reportsDirectory = context.getRealPath("/") + "/WEB-INF/classes/reports/";
        String jasperFile = reportsDirectory+"SviRadnici.jasper";
        JasperPrint jasperPrint = null;
        try{
        if(radnici.size()==0){ // ask is list have nothing inside
            JREmptyDataSource dataSource = new JREmptyDataSource();
            jasperPrint = JasperFillManager.fillReport(jasperFile,params, dataSource);
        }else{ // create a repoert
            JRDataSource dataSource = new JRBeanCollectionDataSource(radnici);
            jasperPrint = JasperFillManager.fillReport(jasperFile,params, dataSource);
        }
        ServletOutputStream servletOutputStream = response.getOutputStream();
// this will create pdf report
        JRPdfExporter pdfExporter = new JRPdfExporter();
           
        pdfExporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
        pdfExporter.setParameter(JRExporterParameter.OUTPUT_STREAM,servletOutputStream);
           
           
        pdfExporter.exportReport();
           
            response.setContentType("application/pdf");
           
            servletOutputStream.flush();
            servletOutputStream.close();
        }catch(Exception e){
            e.printStackTrace();
        }

IS2 - HQL Query and Criteria - Examples

HQL Query and Criteria - Examples

HQL doc. - dokumentacija

two examples - dva primjera

Criterium doc. - kriterijumi dokumentacija

Criteria - kriterija


Vrati zaduzene Primjerke

Session sesija = HibernateUtil.getSessionFactory().getCurrentSession();
            sesija.beginTransaction();
       
            List<Primerak> lista = new ArrayList<Primerak>();
            Query upit = sesija.createQuery("select p from Primerak as p join p.knjiga as k join p.zaduzenjes as z"
            + " where z.datumVracanja is null");
            lista = upit.list();
            sesija.getTransaction().commit();

List<Knjiga> getKnjigeForZaduzenjeKategorija(Date od, Date doK, Kategorija kat)

Session sesija = HibernateUtil.getSessionFactory().getCurrentSession();
            sesija.beginTransaction();
       
            List<Knjiga> lista = new ArrayList<Knjiga>();
           
            Query upit = sesija.createQuery("select k from Knjiga as k " +
                    "join k.primeraks as p join p.zaduzenjes as z where z.clan.kategorija = :kat " +
                    "and z.datumZaduzenja >= :od and z.datumZaduzenja <= :doK");
            upit.setParameter("kat", kat);
            upit.setParameter("od", od);
            upit.setParameter("doK", doK);
            lista = upit.list();
            sesija.getTransaction().commit();

List<Knjiga> findKnjigeby (String izdavac, String godinaIzdanja)

Session sesija = HibernateUtil.getSessionFactory().getCurrentSession();
            sesija.beginTransaction();
            List<Knjiga> lista = new ArrayList<Knjiga>();
            Criteria crit = sesija.createCriteria(Knjiga.class);
            if (izdavac != null){
                crit.add(Restrictions.like("izdavac", izdavac).ignoreCase());
            }
            if (godinaIzdanja != null){
                crit.add(Restrictions.like("godinaIzdanja", godinaIzdanja).ignoreCase());
            }
            lista = crit.list();
            sesija.getTransaction().commit();



List<Clan> getPrezaduzeniClanovi(int maxZaduzenje)

Session sesija = HibernateUtil.getSessionFactory().getCurrentSession();
            sesija.beginTransaction();
       
            List<Clan> lista = new ArrayList<Clan>();
            Query upit = sesija.createQuery("select c from Clan c join c.zaduzenjes as z " +
                    "where z.datumVracanja is null " +
                    "group by c having count(z) > :maxZ");
           
            upit.setInteger("maxZ", maxZaduzenje);
            lista = upit.list();
            sesija.getTransaction().commit();

List<Zaduzenje> getNerazduzenaZaClanskiBroj(int clanskiBroj)

Session sesija = HibernateUtil.getSessionFactory().getCurrentSession();
            sesija.beginTransaction();
       
            List<Zaduzenje> lista = new ArrayList<Zaduzenje>();
            Query upit = sesija.createQuery("from Zaduzenje z where z.datumVracanja is null and " +
             "z.clan.clanskiBroj = :clbroj");
            upit.setParameter("clbroj", clanskiBroj);
            lista = upit.list();
            sesija.getTransaction().commit();


         * TODO Zadatak 3 (10 poena)
         * Implementirati operaciju koja vraca sve knjige
         * koje su u periodu @param datumOd do @param datumDo
         * zaduzivane vise od @param minBrZaduzenja puta
       
        public List<Knjiga> getKnjigeBrojZaduzenja(Date datumOd, Date datumDo, int minBrZaduzenja){           
            Session session = HibernateUtil.getSessionFactory().getCurrentSession();
            session.beginTransaction();
            Query q = session.createQuery("select k from Knjiga k join k.primeraks p join p.zaduzenjes z " +
                    "where z.datumZaduzenja > :datumOd and z.datumZaduzenja < :datumDo group by k having count(z)>:minBr");
           
            q.setDate("datumOd", datumOd);
            q.setDate("datumDo", datumDo);
            q.setInteger("minBr", minBrZaduzenja);
            List<Knjiga> knjige = q.list();      
            session.getTransaction().commit();
            return knjige;
        }

*TODO Zadatak 1 (5 poena)
     * Implementirati operaciju koja pronalazi clana sa zadatim clanskim brojem
     * i zaduzuje ga za primerak @param p
     * Operacija treba da vrati true ako je clan zaduzen,
     * odnosno false ako nije
   
    public boolean zaduziClana(int clanskiBroj, Primerak p){
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();
        Clan c = (Clan) session.get(Clan.class, clanskiBroj);
        session.getTransaction().commit();       
        if(c==null || !isSlobodanPrimerak(p.getInvBroj())) return false;
        session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();
        Zaduzenje z = new Zaduzenje();
        z.setId(446);
        z.setClan(c);
        z.setPrimerak(p);
        z.setDatumZaduzenja(new Date());
        session.save(z);   
        session.getTransaction().commit();  
        return true;
    }
   

     * TODO Zadatak 2 (5 poena)
     * @param invBroj
     * @return

    public boolean isSlobodanPrimerak(String invBroj){
           Session session = HibernateUtil.getSessionFactory().getCurrentSession();
           session.beginTransaction();
           Query q = session.createQuery("from Zaduzenje z where z.primerak.invBroj like :invBroj and z.datumVracanja is null");
           q.setString("invBroj",invBroj);
           if(q.list().isEmpty()){
               session.getTransaction().commit();
               return true; 
           }else{
               session.getTransaction().commit();
               return false;
           }          
       }


     * Vraca sve clanove cije prezime je jednako  @param prezime
     * i koji su rodeni u periodu @param datumOd @param datumDo
     * @return
   
    public List<Clan> getClanoviPrezimeRodjenje(String prezime, Date datumOd, Date datumDo){
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();
        Criteria criteria = session.createCriteria(Clan.class);
        criteria.add(Restrictions.like("prezime", prezime));
        criteria.add(Restrictions.between("datumRodjenja", datumOd, datumDo));
       
        List<Clan> clanovi = criteria.list();
        session.getTransaction().commit();
        return clanovi;       
    }
   

     * Vraca clanove koji imaju nerazduzenih zaduzenja
     * pre @param datumDo
     * @return

      public List<Clan> getZaduzeniClanovi(Date datumDo){
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();
        Query query = session.createQuery("select c from Clan c join c.zaduzenjes z where " +
                "z.datumZaduzenja< :datumDo and z.datumVracanja is null");
        query.setDate("datumDo", datumDo);
        List<Clan> clanovi = query.list();       
        session.getTransaction().commit();   
        return clanovi;
    }
   

     * TODO Zadatak 2 (10 poena)
     * Implementirati operaciju koja vraca sve clanove kategorije
     * @param kat koji su u periodu @param datumOd do @param datumDo
     * imali vise od  @param minBrZaduzenja zaduzenja
   
    public List<Clan> getClanoviBrojZaduzenja(Kategorija kat, Date datumOd, Date datumDo, int minBrZaduzenja){      
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();
        Query query = session.createQuery("select c from Clan c join c.zaduzenjes z where c.kategorija = :kat " +
                "and z.datumZaduzenja> :d1 and z.datumZaduzenja < :d2 group by c having count(z) > :min ");
        query.setEntity("kat", kat);
        query.setDate("d1", datumOd);
        query.setDate("d2", datumDo);
        query.setInteger("min", minBrZaduzenja);
        List<Clan> result = query.list();       
        return result;
    }


* TODO Zadatak 1 (10 poena)
     * Implementirati operaciju koja pronalazi primerak sa inventarnim brojem
     * @param invBroj
     * i zaduzuje ga za clana @param c
     * pri tome treba voditi racuna
     * da primerak ne moze biti dva puta zaduzen i
     * da clan ne moze imati vise od tri nerazduzena zaduzenja
     * Operacija treba da vrati true ako je clan zaduzen,
     * odnosno false ako nije
   
    public boolean zaduziClana(String invBroj, Clan c){       
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();
        Primerak p = (Primerak)session.get(Primerak.class, invBroj);
        if(p==null){
            session.getTransaction().commit();
            return false;
        }
        Query queryZaduzenjaPrimerak = session.createQuery(
                        "select z from Zaduzenje z where z.primerak = :primerak and z.datumVracanja is null");
        queryZaduzenjaPrimerak.setEntity("primerak", p);       
        Query queryZaduzenjaClan = session.createQuery(
                        "select z from Zaduzenje z where z.clan = :clan and z.datumVracanja is null");
        queryZaduzenjaClan.setEntity("clan", c);       
        if((queryZaduzenjaPrimerak.list().size() > 0) || (queryZaduzenjaClan.list().size() > 3)){
            session.getTransaction().commit();
            return false;
        }       
        else{           
            Zaduzenje zaduzenje = new Zaduzenje();
            zaduzenje.setId(9990);
            zaduzenje.setPrimerak(p);
            zaduzenje.setClan(c);
            zaduzenje.setDatumZaduzenja(new Date());           
            session.saveOrUpdate(zaduzenje);
            session.getTransaction().commit();
            return true;
        }   
    }


      * TODO 2. (12 poena) Implementirati operaciju

* koja vraca sve clanove koji su knjigu sa istim autorom i naslovom

* zaduzili vise od @param brZaduzenja puta

public static List<Clan> getClanoviForBrojZaduzenja(int brZaduzenja){

try{

        Session session = HibernateUtil.getSessionFactory().getCurrentSession();

        session.beginTransaction();

        Query query = session.createQuery("select c from Clan c join c.zaduzenjes z " +

                                                                        "group by c,z.primerak.knjiga.naslov,z.primerak.knjiga.autor having count(z) > :min ");

        query.setInteger("min", brZaduzenja);

        List<Clan> result = query.list();

        return result;

}catch(Exception e){

        return null;

}

}

* TODO 1. (8 poena) Koriscenjem upita prema kriterijumu

* implementirati operaciju koja vraca sve knjige koje imaju

* primerke i ciji naslov sadrzi podstring @param naslov deo

* Rezultujuce knjige sortirati po naslovu

public static List<Knjiga> getKnjigeZaDeoNaslova(String naslovDeo){

try{

        Session session = HibernateUtil.getSessionFactory().getCurrentSession();

        session.beginTransaction();

        Criteria crit = session.createCriteria(Knjiga.class);

        crit.add(Restrictions.like("naslov", naslovDeo, MatchMode.ANYWHERE));

        crit.add(Restrictions.sizeGt("primeraks", 0));

        List<Knjiga> knjigas = crit.list();

        session.getTransaction().commit();

        return knjigas;

}catch(Exception e){

        return null;

}

}


List<Primerak> list = getZaduzeniPrimerci();
        for (Primerak p:list){
            System.out.println(p.getInvBroj() + " " + p.getKnjiga().getNaslov());
        }


        <set name="primeraks" table="PRIMERAK" inverse="true" lazy="true" fetch="select">
            <key>
                <column name="ID_KNJIGE" />
            </key>
            <one-to-many class="rs.ac.uns.dmi.is2.dbmodel.Primerak" />
        </set>



<many-to-one name="knjiga" class="rs.ac.uns.dmi.is2.dbmodel.Knjiga" fetch="select" lazy="false">
            <column name="ID_KNJIGE" />
        </many-to-one> 


PARSIRANJE DATUMA 


 static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    static Date date = new Date();
    static Date datumod;
    static Date datumdo;



try{
            datumod = sdf.parse("2013-03-03");
            datumdo = sdf.parse("2013-03-12");
        }catch(Exception e){
            e.printStackTrace();
        }



public static int updateClan(int clanskiBroj, String ime, String prezime, String adresa, Kategorija kategorija, Date datum1){

try{
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();

Clan c = new Clan();
c.setClanskiBroj(clanskiBroj);
c.setIme(ime);
c.setPrezime(prezime);
c.setAdresa(adresa);
c.setDatumRodjenja(datum1);
c.setDatumUpisa(date);
c.setKategorija(kategorija);
c.setZaduzenjes(null);
session.save(c);
session.getTransaction().commit();
return clanskiBroj;
} catch(Exception e) {
e.printStackTrace();
return 0;
}
}

public static int createAndStoreClan(String ime, String prezime, String adresa, Kategorija kategorija, Date datum1){

try{
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();

Clan c = new Clan();
c.setIme(ime);
c.setPrezime(prezime);
c.setAdresa(adresa);
c.setDatumRodjenja(datum1);
c.setDatumUpisa(date);
c.setKategorija(kategorija);
c.setZaduzenjes(null);
Integer clanskiBroj = (Integer) session.save(c);
session.getTransaction().commit();
return clanskiBroj;
} catch(Exception e) {
e.printStackTrace();
return 0;
}
}

KOLOKVIJUM ODRZAN 04.02.2013 GRUPA 1
Resenje prvog zadatka ne radi ako budete pokusavali da pokrenete u eclipse-u jer se to sada radi na drugi nacin ali je profesorica prihvatila jer nam to ona nije pokazala kako treba ustvari, greska je boldirana i podvucena.


     * TODO 1. (8 poena) Koriscenjem upita prema kriterijumu implementirati
     * operaciju koja vraca sva razduzena zaduzenja za koje vazi barem jedan od
     * dva uslova: - zaduzenje se odnosi na knjige koja u naslovu sadrze @param
     * naslovDeo - zaduzenje je izvrseno u periodu @param datumOd - @param
     * datumDo

    public static List<Zaduzenje> getZaduzenjaZaNaslov(String naslovDeo,
            Date datumOd, Date datumDo) {

        try {
            Session session = HibernateUtil.getSessionFactory()
                    .getCurrentSession();
            session.beginTransaction();

            List<Zaduzenje> lista = new ArrayList<Zaduzenje>();

            Criteria crit = session.createCriteria(Zaduzenje.class);

            Criterion lhs = Restrictions.like("primerak.knjiga.naslov",
                    naslovDeo, MatchMode.ANYWHERE);


            Criterion rhs = Restrictions.between("datumZaduzenja", datumOd,
                    datumDo);

            crit.add(Restrictions.isNotNull("datumVracanja"));
            crit.add(Restrictions.or(lhs, rhs));
           
           
            lista = crit.list();

            if (lista.isEmpty()) {
                System.out.println("Rezultat upita je prazan!");
                return null;
            }

            session.getTransaction().commit();
            return lista;
        } catch (Exception e) {
            System.out.println("Doslo je do greske!");
            e.printStackTrace();
            return null;
        }

    }

     * TODO 2. (12 poena) Implementirati operaciju koja vraca sve primerke koji
     * su istog dana bili greskom zaduzeni vise puta

    public static List<Primerak> pronadjiGreskomZaduzene() {

        try {
            Session session = HibernateUtil.getSessionFactory()
                    .getCurrentSession();
            session.beginTransaction();

            List<Primerak> result = new ArrayList<Primerak>();

            Query query = session
                    .createQuery("select p from Primerak p join p.zaduzenjes z where z.datumVracanja is null"
                            + " or (z.datumZaduzenja != z.datumVracanja)"
                            + " group by p, z.datumZaduzenja, z.datumVracanja having count(z) > 1");
           
           
            result = query.list();

            if (result.isEmpty()) {
                System.out.println("Rezultat upita je prazan!");
                return null;
            }

            return result;

        } catch (Exception e) {
            System.out.println("Doslo je do greske!");
            e.printStackTrace();
            return null;
        }

    }

Kolokvijum odrzan 05.04.2013 god, zadaci su bez resenja to je za vjezbu ukoliko ko bude isao na porpavni ako ko ima resenja neka postavi u komentaru dole...



* TODO 2. (14 poena)

* Implementirati operaciju
* koja zaduzuje clana sa clanskim brojem @param clanskiBroj
* za vise primeraka datih u listi @param invBrojevi pri tom izvrsiti sledece provere:
*
* - clan kategorije student moze zaduziti maksimalno 5 primeraka
* - clanovi ostalih kategorija mogu da zaduze najvise 3 primerka
* - da bi se primerak zaduzio on mora biti slobodan
*
* Ukoliko su ispunjeni uslovi, zaduzenja sacuvati u bazi i vratiti izgenerisane primarne kljuceve


public static List<Integer> zaduzi(int clanskiBroj, List<Integer> invBrojevi){ return null; }


* TODO 1. (6 poena)

* Koriscenjem upita prema kriterijumu
* implementirati operaciju koja vraca sve knjige
* za koje vazi barem jedan od dva uslova:
* - izdavac im se nalazi u listi @param izdavaci
* - naslov ne sadrzi string @param naslovDeo


public static List<Knjiga> getKnjigeZaIzdavace(List<String> izdavaci, String naslovDeo){ return null; }