问题描述

java, client传值控制server端 JLabel上的text值, 可是值一直不变

client端代码：
public class KeyboardGUI{

public final String PASSWORD = "123";
public JFrame frame;
public JTextField textField;
public JLabel lblOnoff;
public Socket socket;

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                KeyboardGUI window = new KeyboardGUI();
                window.frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the application.
 */
public KeyboardGUI() {
    initialize();

}

/**
 * Initialize the contents of the frame.
 */
public void initialize() {
    frame = new JFrame();
    frame.setBounds(100, 100, 323, 437);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().setLayout(null);

    lblOnoff = new JLabel("ON/OFF");
    lblOnoff.setFont(new Font("Tahoma", Font.PLAIN, 35));
    lblOnoff.setBounds(132, 11, 150, 53);
    frame.getContentPane().add(lblOnoff);

    JButton button = new JButton("1");
    button.setFont(new Font("Tahoma", Font.PLAIN, 18));
    button.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            textField.setText(textField.getText() + "1");
        }
    });
    button.setBounds(30, 110, 80, 50);
    frame.getContentPane().add(button);

    JButton button_1 = new JButton("2");
    button_1.setFont(new Font("Tahoma", Font.PLAIN, 18));
    button_1.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            textField.setText(textField.getText() + "2");
        }
    });
    button_1.setBounds(116, 110, 80, 50);
    frame.getContentPane().add(button_1);

    JButton button_2 = new JButton("3");
    button_2.setFont(new Font("Tahoma", Font.PLAIN, 18));
    button_2.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            textField.setText(textField.getText() + "3");
        }
    });
    button_2.setBounds(202, 110, 80, 50);
    frame.getContentPane().add(button_2);

    JButton button_3 = new JButton("4");
    button_3.setFont(new Font("Tahoma", Font.PLAIN, 18));
    button_3.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            textField.setText(textField.getText() + "4");
        }
    });
    button_3.setBounds(30, 167, 80, 50);
    frame.getContentPane().add(button_3);

    JButton button_4 = new JButton("5");
    button_4.setFont(new Font("Tahoma", Font.PLAIN, 18));
    button_4.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            textField.setText(textField.getText() + "5");
        }
    });
    button_4.setBounds(116, 167, 80, 50);
    frame.getContentPane().add(button_4);

    JButton btnReset = new JButton("Reset");
    btnReset.setFont(new Font("Tahoma", Font.PLAIN, 18));
    btnReset.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            textField.setText("");
        }
    });
    btnReset.setBounds(30, 337, 80, 50);
    frame.getContentPane().add(btnReset);

    JButton btnSubmit = new JButton("Submit");
    btnSubmit.setFont(new Font("Tahoma", Font.PLAIN, 18));
    btnSubmit.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {

            try {
                KeypadClientSocket();
            } catch (Exception e3) {
                // TODO Auto-generated catch block
                e3.printStackTrace();
            }

            DataOutputStream out = null;
            try {
                out = new DataOutputStream(socket.getOutputStream());
            } catch (IOException e2) {
                // TODO Auto-generated catch block
                e2.printStackTrace();
            }
            String textFieldSting = new String();
            textFieldSting = textField.getText();
            if(textFieldSting.equals(PASSWORD))
            {
                lblOnoff.setText("OFF");
                lblOnoff.setForeground(Color.GREEN);
                try {
                    out.writeInt(1);

                    out.flush();

                    out.close();

                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
            else {
                lblOnoff.setText("ON");
                lblOnoff.setForeground(Color.RED);
                try {
                    out.writeInt(0);

                    out.flush();

                    out.close();

                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }

            textField.setText("");

        }
    });
    btnSubmit.setBounds(116, 337, 166, 50);
    frame.getContentPane().add(btnSubmit);

    textField = new JTextField();
    textField.setFont(new Font("Tahoma", Font.PLAIN, 15));
    textField.setBounds(30, 65, 252, 39);
    textField.setText("");
    frame.getContentPane().add(textField);

}

 public void KeypadClientSocket() throws Exception
    {

     socket = new Socket("10.0.0.29", 4000);

    }

}

Server端代码：
Main.java:

public class Main
{
public static void main(String[] args) throws Exception
{
SensorGUI1 sensorGUI = new SensorGUI1();
sensorGUI.SensorGUI();

    KeypadServerThread();

}

public static void KeypadServerThread() throws Exception {

    ServerSocket serverSocket = new ServerSocket(4000);

    while (true)
    {
        Socket socket = serverSocket.accept();

        new KeypadServerThread(socket).start();

    }
}

}

KeypadServerThread.java:

public class KeypadServerThread extends Thread
{
private Socket socket;
public int data=0;

public KeypadServerThread(Socket socket)
{
    super();
    this.socket = socket;
}

@Override
public void run()
{
    try
    {
        DataInputStream is = new DataInputStream(socket.getInputStream());

        NumObservable numObservable = new NumObservable();
        numObservable.addObserver(new SensorGUI1());
        int dataFromUser = is.readInt();
        numObservable.setData(dataFromUser);

        if (dataFromUser == 1) {
            is.close();
        }

    }
    catch (IOException e)
    {
        e.printStackTrace();
    }
}

}

class NumObservable extends Observable {
public int data=2;

public int getData() {
   return data;
}

public void setData(int i) {
   data = i;
   setChanged();
   notifyObservers();
}

}

SensorGUI1.java:

public class SensorGUI1 implements Observer {

private JFrame frame;
JButton btnOn;
JLabel lblBackgroud;
int feedBack;
NumObservable myObserable;

/**
 * Launch the application.
 */
public void SensorGUI() {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                SensorGUI1 window = new SensorGUI1();
                window.frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

public SensorGUI1() {
    initialize();
}

public void initialize() {
    frame = new JFrame();
    frame.setBounds(100, 100, 749, 414);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().setLayout(null);

    JLayeredPane layeredPane = new JLayeredPane();
    layeredPane.setBounds(10, 11, 713, 353);
    frame.getContentPane().add(layeredPane);

    lblBackgroud = new JLabel("Backgroud");
    lblBackgroud.setBounds(622, 282, 62, 14);
    layeredPane.add(lblBackgroud);

    btnOn = new JButton("ON");
    btnOn.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
        }
    });
    btnOn.setBounds(603, 11, 89, 44);
    layeredPane.add(btnOn);

}

@Override
public void update(Observable o, Object arg) {
    myObserable = (NumObservable) o;

    new Thread(new Runnable() {

        @Override
        public void run() {
            if (myObserable.getData() == 1) {
                System.out.println(myObserable.getData());
                lblBackgroud.setText("OFF");
                JOptionPane.showMessageDialog(frame, "The user turned off the system");

            } else if (myObserable.getData() == 0) {
                lblBackgroud.setText("ON");
                JOptionPane.showMessageDialog(frame, "The user turned on the system");
            }
        }
    }).start();;

}

}