qqclient.java

简易的QQ聊天程序 里面只有两个文件 server.java client.java 供初学者研究学习

import java.net.*;
import java.io.*;
import java.util.*;

import javax.swing.*;
import java.awt.event.*;
public class QQClient {
	String name;
	BufferedReader in;
	PrintWriter out;
	JTextField jtf;
	JTextArea jta;
	JComboBox jcb;
	public static void main(String[] args) {
		if (args.length==0 || args[0].equals("All")||args[0].indexOf(":")!=-1){
			System.out.println("Error!");
			System.exit(0);
		}
		Socket s=null;
		try {
			s = new Socket("127.0.0.1",7755);
			QQClient client=new QQClient(s,args[0]);
			client.prepare();
			client.receive();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	public QQClient(Socket s,String name) throws Exception{
		this.name=name;
		this.in=new BufferedReader(new InputStreamReader(s.getInputStream()));
		this.out=new PrintWriter(s.getOutputStream());
		JFrame frame=new JFrame("Client "+name);
		frame.setSize(400,300);
		JPanel panel=new JPanel();
		this.jcb=new JComboBox();
		jcb.addItem("All");
		this.jtf=new JTextField(25);
		panel.add(jcb);
		panel.add(jtf);
		this.jta=new JTextArea();
		this.jta.setEditable(false);
		frame.getContentPane().add(new JScrollPane(jta));
		frame.getContentPane().add(panel,"South");
		frame.setVisible(true);
		frame.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent arg0) {
				end();
			}
		});
		this.jtf.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent arg0) {
				send();
			}
		});
	}
	void prepare() throws Exception{
		out.println("1:"+name+":");
		out.flush();
	}
	void end(){
		out.println("2:"+name+":");
		out.flush();
		
		System.exit(0);
	}
	void send(){
		String receiver=(String)(this.jcb.getSelectedItem());
		if (receiver==null) return;
		String text=this.jtf.getText();
		if ((text.indexOf(":"))!=-1){
			this.jtf.setText("");
			return;
		}
		out.println("3:"+receiver+":"+text);
		out.flush();
		this.jtf.setText("");
	}
	void receive(){
		while(true){
			try {
				String str=in.readLine();
				String[] info=parseString(str);
				if (info[0].equals("1")){
					this.jta.append(info[1]+" entered!"+"\n");
					this.jcb.addItem(info[1]);
				}
				else if (info[0].equals("2")){
					this.jta.append(info[1]+" exit!"+"\n");
					this.jcb.removeItem(info[1]);
				}
				else{
					this.jta.append(info[1]+" said:"+info[2]+"\n");
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
	private String[] parseString(String s){
		String[] ss=new String[3];
		int i=0;
		StringTokenizer st=new StringTokenizer(s,":");
		while(st.hasMoreTokens()){
			ss[i]=st.nextToken();
			i++;
		}
		return ss;
	}	

}