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couple of problems with TCP in Java

Ask Time:2012-09-22T17:11:17         Author:Mirwais Maarij

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Okay so firstly it does connect to the server so there is no problem with the connection, the following code show the connection and sending a message to the server, when I click run it doesn't open up the JFrame, the window where I can see my tool... Also I'm trying to send what I get from jMessage.getText into ows, but I get an error at this line:

String process = jMessage.getText();

Also I'd like to call osw.write(process); ONLY when I click the bSend button, so how can I use this inside the main method? Please take a look at the code, also remember the first question that my JFrame wont open in a new window showing me my tool, it just prints out the System.out.println at netbeans console:

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package tcpservidor;

import java.io.*;
import java.net.InetAddress;
import java.net.Socket;

/**
 *
 * @author Damage
 */
public class TeKServer extends javax.swing.JFrame {

/**
 * Creates new form TeKServer
 */
public TeKServer() {
    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() {

    jLabel1 = new javax.swing.JLabel();
    jScrollPane1 = new javax.swing.JScrollPane();
    textArea = new javax.swing.JTextArea();
    jMessage = new javax.swing.JTextField();
    bSendMessage = new javax.swing.JButton();
    jLabel2 = new javax.swing.JLabel();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jLabel1.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
    jLabel1.setText("Chat Client");

    textArea.setColumns(20);
    textArea.setRows(5);
    textArea.setEnabled(false);
    jScrollPane1.setViewportView(textArea);

    bSendMessage.setText("Send");
    bSendMessage.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            bSendMessageActionPerformed(evt);
        }
    });

    jLabel2.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
    jLabel2.setText("Message");

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
            .addGap(0, 0, Short.MAX_VALUE)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                    .addComponent(jLabel1)
                    .addGap(294, 294, 294))
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                    .addComponent(jLabel2)
                    .addGap(303, 303, 303))))
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jScrollPane1)
                        .addComponent(jMessage))
                    .addContainerGap())
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                    .addGap(0, 291, Short.MAX_VALUE)
                    .addComponent(bSendMessage, javax.swing.GroupLayout.PREFERRED_SIZE, 81, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(286, 286, 286))))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jLabel1)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 319, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(jLabel2)
            .addGap(3, 3, 3)
            .addComponent(jMessage, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .addComponent(bSendMessage)
            .addContainerGap())
    );

    pack();
}// </editor-fold>

private void bSendMessageActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:


}

/**
 * @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(TeKServer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(TeKServer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(TeKServer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(TeKServer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>
    /** Define a host server */
        String host = "192.168.0.8";
        /** Define a port */
        int port = 7777;

        StringBuffer instr = new StringBuffer();
        String TimeStamp;
        System.out.println("SocketClient initialized");
        try {
        /** Obtain an address object of the server */
        InetAddress address = InetAddress.getByName(host);
        /** Establish a socket connetion */
        Socket connection = new Socket(address, port);
        System.out.println("Connection Established!");
        /** Instantiate a BufferedOutputStream object */
        BufferedOutputStream bos = new BufferedOutputStream(connection.
        getOutputStream());

        /** Instantiate an OutputStreamWriter object with the optional character
        * encoding.
        */
        OutputStreamWriter osw = new OutputStreamWriter(bos, "US-ASCII");
        TimeStamp = new java.util.Date().toString();

        String process = jMessage.getText();
        /** Write across the socket connection and flush the buffer */
        osw.write(process);
        osw.flush();
         /** Instantiate a BufferedInputStream object for reading
        /** Instantiate a BufferedInputStream object for reading
        * incoming socket streams.
        */

        BufferedInputStream bis = new BufferedInputStream(connection.
            getInputStream());
        /**Instantiate an InputStreamReader with the optional
        * character encoding.
        */

        InputStreamReader isr = new InputStreamReader(bis, "US-ASCII");

        /**Read the socket's InputStream and append to a StringBuffer */
        int c;
        while ( (c = isr.read()) != 13)
            instr.append( (char) c);

        /** Close the socket connection. */
        connection.close();
        System.out.println(instr);
        }
        catch (IOException f) {
        System.out.println("IOException: " + f);
        }
        catch (Exception g) {
        System.out.println("Exception: " + g);
        }

    /*
     * Create and display the form
     */
    java.awt.EventQueue.invokeLater(new Runnable() {

        @Override
        public void run() {
            new TeKServer().setVisible(true);
        }
    });
}
// Variables declaration - do not modify
private javax.swing.JButton bSendMessage;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
public javax.swing.JTextField jMessage;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextArea textArea;
// End of variables declaration
}

Author:Mirwais Maarij,eproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article:https://stackoverflow.com/questions/12542458/couple-of-problems-with-tcp-in-java
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