chat.java

实现简单的通信功能,让自己掌握socket编程

package com.tarena.chat1;
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;

public class Chat extends JDialog {
	private JButton startBtn;
	private JButton stopBtn;
	private Container contentPane;
	private JTextField userName;
	private JTextField host;
	private String title;
	
	public Chat(String title) {
		this.title=title;
		setTitle(title);
		setSize(250, 150);
		contentPane = getContentPane();
		GridBagLayout gbl = new GridBagLayout();
		contentPane.setLayout(gbl);
		GridBagConstraints gbc = new GridBagConstraints();
		JLabel userLbl = new JLabel("User Name:");
		JLabel hostLbl = new JLabel("Chat Host:");
		userName = new JTextField();
		host = new JTextField();
		userName.setText("Guest");
		host.setText("239.255.255.255");
		gbc.fill = GridBagConstraints.BOTH;
		gbc.gridwidth = 2;
		makeComponent(gbl, userLbl, gbc);
		gbc.gridwidth = GridBagConstraints.REMAINDER;
		makeComponent(gbl, userName, gbc);
		gbc.gridwidth = 2;
		makeComponent(gbl, hostLbl, gbc);
		gbc.gridwidth = GridBagConstraints.REMAINDER;
		makeComponent(gbl, host, gbc);
		startBtn = new JButton("start");
		ActionListener ca=new ActionListener(){
			public void actionPerformed(ActionEvent ae) {
				connect();
			}
		};
		startBtn.addActionListener(ca);
		userName.addActionListener(ca);
		host.addActionListener(ca);
		stopBtn = new JButton("stop");
		stopBtn.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				System.exit(0);
			}
		});
		gbc.fill = GridBagConstraints.CENTER;
		gbc.gridwidth = 2;
		makeComponent(gbl, startBtn, gbc);
		gbc.gridwidth = GridBagConstraints.REMAINDER;
		makeComponent(gbl, stopBtn, gbc);
		setDefaultCloseOperation(DISPOSE_ON_CLOSE);
		Dimension screenSize = 
			Toolkit.getDefaultToolkit().getScreenSize();
		setLocation((int)(screenSize.getWidth()-this.getWidth())/2,
				(int)(screenSize.getHeight()-this.getHeight())/2);
	}
	private void makeComponent(GridBagLayout gbl, Component c,
			GridBagConstraints gbc) {
		gbl.setConstraints(c, gbc);
		contentPane.add(c);
	}
	private void connect() {
		String user=userName.getText();
		if(user.indexOf(Helper.TAG)>=0){
			userName.setText("");
			return;
		}
		IConnecter conn =new UDPConnecter(
				host.getText(), 9998, userName.getText());
		if (conn.connect()) {
			setVisible(false);
			ISender sender = conn.getSender();
			View v = new View(sender);
			ReceiverThread rt = 
				new ReceiverThread(v, conn.getReceiver());
			v.showMe(title);
			rt.start();
		} else {
			System.out.println("Can not connected!");
			setVisible(true);
		}
	}
	public static void main(String[] args) {
		(new Chat("My Chat Room")).setVisible(true);
	}
}