Java Tutorial: how to create simple java gui for chatting

What Will I Learn?

• You will learn how to create graphics user interface GUI on netbeans.
• You will learn how to create program to send and recieve message using netbeans
• You will learn how to create simple chatting App
• You will learn how to implement program to jFrame project

Requirements

• you must know about java programming
• you must know about the items on NetBeans jFrame
• you must know about NetBeans tools
• NetBeans

Difficulty

• Intermediate

Tutorial Contents

okay, today I will make a tutorial how to make a simple chat application, here we will make two interconnected program so that can do chatting process using java programming language on netbeans.
okay, we just go into the tutorial.

• the first step you should do is open the netbeans application.
  

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• create new project
  

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• select java catagories, and project java application.
  

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• then name it for your new project, then click finish
  
• then right click on the project you have created then select new, then select jFrame.
  
• then create JFrame class and name it for your jFrame class, then click finish.
  
• then, design your GUI application, here I just make a simple GUI for both server.
  

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• then change the variable name to each component of the GUI you created by right clicking on the object you want to change the variable.
  

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• then fill the code in the source section for your jFrame class.
  

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• below is the code that you have to enter into the source JFrame class you have created

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.file.Path;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
public class ProgramKirim1 extends javax.swing.JFrame {
int Port =Integer.parseInt(JOptionPane.showInputDialog("Input Your Port : "));
String IP = JOptionPane.showInputDialog("Input Your IP Server : ");
 public ProgramKirim1() {
        initComponents();
    }
 @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {
        pilihFile = new javax.swing.JButton();
        sendFile = new javax.swing.JButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        txtPath = new javax.swing.JTextArea();
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        pilihFile.setLabel("Choose File");
        pilihFile.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                pilihFileActionPerformed(evt);
            }
        });
        sendFile.setLabel("Send File");
        sendFile.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                sendFileActionPerformed(evt);
            }
        });
        txtPath.setColumns(20);
        txtPath.setRows(5);
        jScrollPane1.setViewportView(txtPath);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(2, 2, 2)
                .addComponent(pilihFile)
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(sendFile)
                        .addGap(0, 0, Short.MAX_VALUE))
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 293, Short.MAX_VALUE)))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(66, 66, 66)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(pilihFile)
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 103, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addComponent(sendFile)
                .addContainerGap(90, Short.MAX_VALUE))
        );
        pack();
    }    private void pilihFileActionPerformed(java.awt.event.ActionEvent evt) {                                          
        JFileChooser pilih=new JFileChooser();
        int confirm=pilih.showOpenDialog(null);
        if(confirm==JFileChooser.APPROVE_OPTION){
            Path path=pilih.getSelectedFile().toPath();
            txtPath.append(path.toString());
        }
    }                                         
    private void sendFileActionPerformed(java.awt.event.ActionEvent evt) {                                        
        try {
            int buffer_size=1024;
            byte[] buffer = new byte[buffer_size];
            ServerSocket servsock = new ServerSocket(Port);
            Socket sock = servsock.accept();
            System.out.println("koneksi terbentuk");
            String folderFile=txtPath.getText();
            BufferedInputStream in = new BufferedInputStream(new FileInputStream(folderFile));
            BufferedOutputStream out = new BufferedOutputStream(sock.getOutputStream());
            int len;
            while((len = in.read(buffer)) > 0){
                out.write(buffer,0,len);
            }
            out.flush();
            servsock.close();
            sock.close();
            in.close();
            out.close();
        } catch (IOException ex){
            Logger.getLogger(ProgramKirim1.class.getName()).log(Level.SEVERE, null, ex);                 
        }
    }                                        
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {     java.util.logging.Logger.getLogger(ProgramKirim1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {       java.util.logging.Logger.getLogger(ProgramKirim1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex){ java.util.logging.Logger.getLogger(ProgramKirim1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {       java.util.logging.Logger.getLogger(ProgramKirim1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new ProgramKirim1().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                     
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JButton pilihFile;
    private javax.swing.JButton sendFile;
    private javax.swing.JTextArea txtPath;
    // End of variables declaration                   
}

• this is the declaration of the class name send public class Send writing class names must be capitalized, and should not use spaces.

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.file.Path;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;

• this Throws IOException Is A Method That Reads String Data Input
• this is a variable declaration process port int Port =Integer.parseInt(JOptionPane.showInputDialog with JOptionPane input method.
• initComponent(); is the method generated by netbeans by default. Then there is also a method getter and setter for the userList variable.
• Modifier private on data: means data can only be accessed from the same class.
• JFileChooser is a component of Java Swing that serves to provide convenience to the user to select / open the file.
• public int showOpenDialog(Component parent) throws HeadlessException.
• BUFFER_SIZE 1024 Buffer management macros.
• java.net.ServerSocket used by Server to listen to connections.
• java.net.Socket used by Client for connection initialization.
• BufferedOutputStream can be used for reading and writing binary data from a file.
• out.flush(); Allocate new memory to ObjectInputStream.
• servsock.close(); serves to close the file.
• this is a mandatory class and can not be changed

// Variables declaration - do not modify                     
   private javax.swing.JScrollPane jScrollPane1;
   private javax.swing.JButton pilihFile;
   private javax.swing.JButton sendFile;
   private javax.swing.JTextArea txtPath;

• okay, next is full code for the recipient program, I do not explain anymore about this program because the syntax is same with previous program only different in some part only.

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
public class ProgramTerima extends javax.swing.JFrame {
int Port =Integer.parseInt(JOptionPane.showInputDialog("Input Your Port : "));
String IP = JOptionPane.showInputDialog("Input Your IP Server : ");  
    public ProgramTerima() {
        initComponents();
    }
 <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {
        jPanel1 = new javax.swing.JPanel();
        jScrollPane1 = new javax.swing.JScrollPane();
        txtPath = new javax.swing.JTextArea();
        saveCommand = new javax.swing.JButton();
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        jPanel1.setBackground(new java.awt.Color(204, 153, 0));
        txtPath.setColumns(20);
        txtPath.setRows(5);
        jScrollPane1.setViewportView(txtPath);
        saveCommand.setLabel("Simpan");
        saveCommand.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                saveCommandActionPerformed(evt);
            }
        });
        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addComponent(saveCommand)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 317, Short.MAX_VALUE)
                .addContainerGap())
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(117, 117, 117)                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(saveCommand)
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 75, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(156, Short.MAX_VALUE))
        );
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );
        pack();
    }// </editor-fold>                       
    private void saveCommandActionPerformed(java.awt.event.ActionEvent evt) {                                              
       JFileChooser pilih=new JFileChooser();
       pilih.setDialogTitle("Tentukan Tempat Penyimpanan");
       int userSelection = pilih.showSaveDialog(null);
       if(userSelection == JFileChooser.APPROVE_OPTION){
           File fileToSave = pilih.getSelectedFile();
           System.out.println("Save as file : "+ fileToSave.getAbsolutePath());
           txtPath.append(fileToSave.getAbsolutePath());
           try {
            int buffer_size=1024;
            byte[] buffer = new byte[buffer_size];
            Socket socket = new Socket("127.0.0.1",Port);
            BufferedInputStream in = new BufferedInputStream(socket.getInputStream());
            BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(fileToSave));
            int len;
            while((len = in.read(buffer)) > 0){
                out.write(buffer,0,len);
            }
            out.flush();
            socket.close();
            in.close();
            out.close();
        } catch (IOException ex){
           Logger.getLogger(ProgramTerima.class.getName()).log(Level.SEVERE, null, ex);   
        }
       }
    }                                           
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {            java.util.logging.Logger.getLogger(ProgramTerima.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {         java.util.logging.Logger.getLogger(ProgramTerima.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {         java.util.logging.Logger.getLogger(ProgramTerima.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {    java.util.logging.Logger.getLogger(ProgramTerima.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
      /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new ProgramTerima().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                     
    private javax.swing.JPanel jPanel1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JButton saveCommand;
    private javax.swing.JTextArea txtPath;
    // End of variables declaration                   
}

• okay, we'll run two programs we've created
  
• then write the message you want to send.
  

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• Okay, then we run the recipient program.
  

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• okay, the message we sent successfully entered the recipient program, meaning that both programs we created successfully.

Curriculum

• Java Tutorial: How To Create a Program To Send And Receive Files On NetBeans