Java Tutorial: How To Create GUI For Send And Receive File Application On NetBeans

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 receive file using netbeans
• 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

Difficulty

• Intermediate

Tutorial Contents

okay on this occasion I will make a tutorial how to make a GUI for an application to send and receive files with netbeans, my tutorial this time related to my previous tutorial that is mebuat access between the two programs so that become interconnected. okay, we just go into the tutorial.

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

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• then create a new project
  

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• in the categories select java, and in the project select java application. then press next
  

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• then name it for your new project, then press the finish button.
  

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• then right click on the project you have created then select new, then select jFrame.
  

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• then create a name for your class jFrame, then click finish.
  

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• then create a design for your GUI application, here I just make a simple GUI, just use tools text area, and tools button.
  

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• then change the variable name to each component of the GUI you created by right click on the object you want to change the variable. make sure the name you created is the same as the variables that exist in the source program that you created so that the component can work in accordance with what we want.
  

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• then write the code in the source section of the jFrame class you have created.
  

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• here is the full code for the SendApp program we want to create. I will explain it below.

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 SendApp extends javax.swing.JFrame {
int Port =Integer.parseInt(JOptionPane.showInputDialog("Input Your Port : "));
String IP = JOptionPane.showInputDialog("Input Your IP Server : ");
 public SendApp() {
        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 dan setter for variabel userList.
• Modifier private means that data can only be accessed from the same class.
• JFileChooser is a component of Java Swing that serves to make it easy for 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(); Allocating new memory to ObjectInputStream
• servsock.close(); serves to close the file.
• these are some classes that have been available and can not be modified

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 ReceiveApp extends javax.swing.JFrame {
int Port =Integer.parseInt(JOptionPane.showInputDialog("Input Your Port : "));
String IP = JOptionPane.showInputDialog("Input Your IP Server : ");  
    public RecieveApp() {
        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 then we try to run both programs we have created.
• right click on file, then select run file.
  
• then select the file you want to send.
  

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• then press send button.

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• Okay, then we run the recipient program.
  

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• select the folder where you want to save the previously sent file and press save button.
  

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• okay, after the above process is finished we will check whether the file that is sent is contained in the destination folder.
  
• okay file is available in our destination folder, it means GUI application to send and receive file we have successfully created.

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THANKS TOLD THIS TUTORIAL TO FINISH, SORRY IF I'VE A MISTAKE IN THIS TUTORIAL

Curriculum

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

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Posted on Utopian.io - Rewarding Open Source Contributors

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