- #1
zak100
- 462
- 11
Hi,
I made a program to send a message from a Server to a client on the same machine in NetBeans on a Button click. I used the following code in the button handler:
It worked but when i pressed the button again to send another message , i got following error:
To handle this error, i created two methods: createConnection( ) & closeConnection( ) but now i am getting following error:
and the client code is:
Some body please guide me how to get around with this problem.
Zulfi.
I made a program to send a message from a Server to a client on the same machine in NetBeans on a Button click. I used the following code in the button handler:
Java:
private void sendMsgButtonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
try{
ServerSocket sSocket=new ServerSocket(800);
System.out.println("Server Started");
Socket cSocket=sSocket.accept(); PrintWriter writer=new PrintWriter(cSocket.getOutputStream());
writer.println("Hello I am the Server"); writer.flush();
writer.close(); Thread.currentThread().sleep(2000);
cSocket.close();
sSocket.close();
}catch(SocketTimeoutException s)
{
System.out.println("Socket timed out!");
break;
}
catch(IOException e) {
e.printStackTrace();
} }To handle this error, i created two methods: createConnection( ) & closeConnection( ) but now i am getting following error:
My complete server code is:
Java:
import java.io.IOException;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketTimeoutException;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author HP
*/
public class Server2JFrame extends javax.swing.JFrame {
/**
* Creates new form Server2JFrame
*/
ServerSocket sSocket;
Sockect cSocket;
PrintWriter writer;
public void createConnection( ){
try{
sSocket=new ServerSocket(800);
System.out.println("Server Started");
cSocket=sSocket.accept();
Thread.currentThread().sleep(2000);
}catch(SocketTimeoutException s)
{
System.out.println("Socket timed out!");
break;
}
catch(IOException e) {
e.printStackTrace();
}
}
public static void closeConnection(){
cSocket.close();
sSocket.close();
}
public Server2JFrame() {
createConnection( );
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
sendMesgButton = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
sendMesgButton.setText("Send Multiple Message");
sendMesgButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
sendMesgButtonActionPerformed(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()
.addGap(65, 65, 65)
.addComponent(sendMesgButton)
.addContainerGap(82, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addContainerGap(42, Short.MAX_VALUE)
.addComponent(sendMesgButton)
.addGap(35, 35, 35))
);
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(87, 87, 87)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(25, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(79, 79, 79)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(121, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void sendMesgButtonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
writer=new PrintWriter(cSocket.getOutputStream());
writer.println("Hello I am the Server");
writer.flush();
writer.close();
}
/**
* @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(Server2JFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Server2JFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Server2JFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Server2JFrame.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 Server2JFrame().setVisible(true);
}
});
closeConnection( );
}
// Variables declaration - do not modify
private javax.swing.JPanel jPanel1;
private javax.swing.JButton sendMesgButton;
// End of variables declaration
}
Java:
import java.net.*;
import java.io.*;
public class NewJFrame extends javax.swing.JFrame {
/**
* Creates new form NewJFrame
*/
public NewJFrame() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
recvMesgButton = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
recvMesgButton.setText("Received Client Message");
recvMesgButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
recvMesgButtonActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addContainerGap(37, Short.MAX_VALUE)
.addComponent(recvMesgButton)
.addGap(34, 34, 34))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(66, 66, 66)
.addComponent(recvMesgButton)
.addContainerGap(71, Short.MAX_VALUE))
);
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(104, 104, 104)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(87, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(55, 55, 55)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(85, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void recvMesgButtonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
try{
Socket toServer=new Socket(InetAddress.getLocalHost(),800);
BufferedReader bufr=new BufferedReader(new InputStreamReader(toServer.getInputStream()));
System.out.println(bufr.readLine());
bufr.close();
toServer.close();
}catch(IOException e){
e.printStackTrace();
break;
}
}
/**
* @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(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(NewJFrame.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 NewJFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JPanel jPanel1;
private javax.swing.JButton recvMesgButton;
// End of variables declaration
}Some body please guide me how to get around with this problem.
Zulfi.