Copy this link when reproducing:
http://www.casperlee.com/en/y/blog/226
Although I normally don't want to use Java to create a GUI, I'm gonna do it this time, because I want to develop a Socket Server with Java, and it is better to have a User Interface then have nothing. Actually creating a GUI with Java is not that complex.
Just like before, let's take it easy and enjoy a few beautiful photos first.
1. To develop and run Java programs in Windows, you need to install JDK (Java Development Kit) and probably Eclipse too. Check this link http://www.casperlee.com/x/y/blog/78 for detail if necessary.
2. Create a Java project.
I. Run Eclipse, select "File -> New -> Project..." from the main menu, a dialog will be popped up:
II. Select "Java -> Java Project", and click "Next >" to continue.
III. Type in the project name and click "Next >" to continue.
IV. Click "Finish" to continue.
V. Click "Open Perspective", if you see the dialog above. Eclipse will create a Java project.
3. Create the main form.
I. Right click on "src" in the Package explorer, select "New -> Class" from the popped menu, a dialog will be popped up:
II. Type in the class name, tick "public static void main(String[] args)", and click "Finish", Eclipse will create a class named "MainForm".
III. Open the file MainForm.java, put the following text in:
package com.casperlee.CSocketServer;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class MainForm extends JFrame {
// Widgets
GridLayout glMain = new GridLayout(0, 1);
JLabel lblTop = new JLabel("This is a common socket server.");
JTextField tfPort = new JTextField();
JButton btnStart = new JButton("Start");
JButton btnStop = new JButton("Stop");
JButton btnViewLog = new JButton("View Log");
JButton btnQuit = new JButton("Quit");
// Constants
private static final long serialVersionUID = 1562493580742512448L;
// Fields
private CServer server;
// Constructors
public MainForm() {
super("Casper Socket Server");
this.addComponents();
this.initialize();
}
// Private functions
private void addComponents() {
this.setLayout(glMain);
this.add(lblTop);
this.add(tfPort);
this.add(btnStart);
this.add(btnStop);
this.add(btnViewLog);
this.add(btnQuit);
}
private void initialize() {
this.tfPort.setText(Integer.toString(CServer.defaultPortNum));
this.btnStart.addActionListener(new ButtonClickListener());
this.btnStop.addActionListener(new ButtonClickListener());
this.btnViewLog.addActionListener(new ButtonClickListener());
this.btnQuit.addActionListener(new ButtonClickListener());
}
private void updateUI() {
if (this.server.isAlive()) {
this.btnStart.setEnabled(false);
this.btnStop.setEnabled(true);
this.lblTop.setText("Casper Socket Server Started!");
} else {
this.btnStart.setEnabled(true);
this.btnStop.setEnabled(false);
this.lblTop.setText("Casper Socket Server Stopped!");
}
}
// Event handlers
private void performStartAction(ActionEvent e) {
if (this.server != null && this.server.isAlive()) {
return;
}
this.server = new CServer();
this.server.start();
this.updateUI();
}
private void performStopAction(ActionEvent e) {
if (!this.server.isAlive()) {
return;
}
this.server.interrupt();
try {
this.server.join();
} catch (InterruptedException e1) {
e1.printStackTrace();
}
this.updateUI();
}
private void performViewLogAction(ActionEvent e) {
}
private void performQuitAction(ActionEvent e) {
}
// private classes
private class ButtonClickListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource() instanceof JButton) {
JButton btn = (JButton)e.getSource();
if (btn == btnStart) {
performStartAction(e);
} else if (btn == btnStop) {
performStopAction(e);
} else if (btn == btnViewLog) {
performViewLogAction(e);
} else if (btn == btnQuit) {
performQuitAction(e);
}
}
}
}
// Main function
public static void main(String[] args) {
MainForm f = new MainForm();
f.pack();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}4. As you may already noticed, the main form is using a class named "CServer". Here is the code of the CServer class:
package com.casperlee.CSocketServer;
public class CServer extends Thread {
// Constants
public static final int defaultPortNum = 9527;
// Fields
private int portNum;
// Constructor
public CServer(int aPort) {
super();
this.portNum = aPort;
}
public CServer() {
super();
this.portNum = defaultPortNum;
}
// Override functions
@Override
public void run() {
while (true) {
if (this.isInterrupted()) {
break;
}
}
}
}5. Done!