Java Socket read from socket in real time
ssh_input = new javax.swing.JPanel();
    connect = new javax.swing.JButton();
    jLabel1 = new javax.swing.JLabel();
    jLabel2 = new javax.swing.JLabel();
    jLabel3 = new javax.swing.JLabel();
    hostname = new javax.swing.JTextField();
    username = new javax.swing.JTextField();
    password = new javax.swing.JPasswordField();
    ssh_command = new javax.swing.JTextField();
    ssh_output_pannel = new javax.swing.JPanel();
    jScrollPane1 = new javax.swing.JScrollPane();
    ssh_output = new javax.swing.JTextArea();
    clear_text = new javax.swing.JButton();

    connect.setText("Connect");
    connect.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            connectActionPerformed(evt);
        }
    });

    jLabel1.setText("Host Name");

    jLabel2.setText("User Name");

    jLabel3.setText("Password");

    hostname.setText("10.4.0.135");

    username.setText("xzhang");

    password.setText("Samboapple0827!");

    ssh_command.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            ssh_commandActionPerformed(evt);
        }
    });

    javax.swing.GroupLayout ssh_inputLayout = new javax.swing.GroupLayout(ssh_input);
    ssh_input.setLayout(ssh_inputLayout);
    ssh_inputLayout.setHorizontalGroup(
        ssh_inputLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(ssh_inputLayout.createSequentialGroup()
            .addContainerGap()
            .addGroup(ssh_inputLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jLabel1)
                .addGroup(ssh_inputLayout.createSequentialGroup()
                    .addGroup(ssh_inputLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jLabel2)
                        .addComponent(jLabel3))
                    .addGap(18, 18, 18)
                    .addGroup(ssh_inputLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                        .addComponent(username, javax.swing.GroupLayout.Alignment.TRAILING)
                        .addComponent(password)
                        .addComponent(hostname, javax.swing.GroupLayout.PREFERRED_SIZE, 122, javax.swing.GroupLayout.PREFERRED_SIZE))))
            .addGroup(ssh_inputLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(ssh_inputLayout.createSequentialGroup()
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addComponent(connect))
                .addGroup(ssh_inputLayout.createSequentialGroup()
                    .addGap(49, 49, 49)
                    .addComponent(ssh_command, javax.swing.GroupLayout.PREFERRED_SIZE, 300, javax.swing.GroupLayout.PREFERRED_SIZE)))
            .addContainerGap(60, Short.MAX_VALUE))
    );
    ssh_inputLayout.setVerticalGroup(
        ssh_inputLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(ssh_inputLayout.createSequentialGroup()
            .addGap(14, 14, 14)
            .addGroup(ssh_inputLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel1)
                .addComponent(hostname, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(connect))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(ssh_inputLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel2)
                .addComponent(username, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addGroup(ssh_inputLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel3)
                .addComponent(password, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(ssh_command, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addContainerGap(18, Short.MAX_VALUE))
    );

    ssh_output.setColumns(20);
    ssh_output.setEditable(false);
    ssh_output.setLineWrap(true);
    ssh_output.setRows(5);
    jScrollPane1.setViewportView(ssh_output);

    clear_text.setText("Clear");
    clear_text.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            clear_textActionPerformed(evt);
        }
    });

    javax.swing.GroupLayout ssh_output_pannelLayout = new javax.swing.GroupLayout(ssh_output_pannel);
    ssh_output_pannel.setLayout(ssh_output_pannelLayout);
    ssh_output_pannelLayout.setHorizontalGroup(
        ssh_output_pannelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(ssh_output_pannelLayout.createSequentialGroup()
            .addContainerGap()
            .addGroup(ssh_output_pannelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 591, Short.MAX_VALUE)
                .addComponent(clear_text, javax.swing.GroupLayout.Alignment.TRAILING))
            .addContainerGap())
    );
    ssh_output_pannelLayout.setVerticalGroup(
        ssh_output_pannelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(ssh_output_pannelLayout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 371, Short.MAX_VALUE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(clear_text)
            .addContainerGap())
    );

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addComponent(ssh_input, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        .addComponent(ssh_output_pannel, 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)
        .addGroup(layout.createSequentialGroup()
            .addComponent(ssh_input, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(ssh_output_pannel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
    );
}// </editor-fold>

private void connectActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:
                    /*get host_name*/
                host_name=hostname.getText();
                user_name=username.getText();
                pass_word=password.getText();
        /* Create a connection instance */
                  app_conn=new Connection(host_name);
                  try
        {
                          app_conn.connect();
        /* Authenticate.
         * If you get an IOException saying something like
         * "Authentication method password not supported by the server at this stage."
         * then please check the FAQ.
         */
        boolean isAuthenticated = app_conn.authenticateWithPassword(user_name, pass_word);

        if (isAuthenticated == false)
            throw new IOException("Authentication failed.");

                     JOptionPane.showMessageDialog(null, "You are connected to host "+host_name, "Connection",
                                    JOptionPane.INFORMATION_MESSAGE);
        /* Create a session */
                    }
                    catch(IOException e)
                    {}


}

private void ssh_commandActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
    String command=ssh_command.getText();
     try
    {

    app_session=app_conn.openSession();
    app_session.execCommand( command );
        InputStream stdout = new StreamGobbler( app_session.getStdout() );
        BufferedReader br = new BufferedReader(new InputStreamReader(stdout));
        String line ;
        while( (line= br.readLine()) != null )
        {
            ssh_output.append( line + "n" );
            //line = br.readLine();
        }
        // DEBUG: dump the exit code
        System.out.println( "ExitCode: " + app_session.getExitStatus() );

        // Close the session
        app_session.close();
    }
     catch(Exception e)
     {}
}

private void clear_textActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:
    ssh_output.setText("");
}


// Variables declaration - do not modify
private javax.swing.JButton clear_text;
private javax.swing.JButton connect;
private javax.swing.JTextField hostname;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JPasswordField password;
private javax.swing.JTextField ssh_command;
private javax.swing.JPanel ssh_input;
private javax.swing.JTextArea ssh_output;
private javax.swing.JPanel ssh_output_pannel;
private javax.swing.JTextField username;
// End of variables declaration