java基于tcp网络聊天

import java.io.BufferedReader;   
import java.io.IOException;   
import java.io.InputStreamReader;   
import java.io.PrintStream;   
import java.net.ServerSocket;   
import java.net.Socket;   
import java.util.StringTokenizer;   
import java.util.Vector;   
  
/**  
 * 服务器端编码  
 * @author 欧阳平 2009-3-17   
 */  
public class ChatServer {   
    static int port = 5566;//端口号   
    static Vector<Client> clients = new Vector<Client>(10);//存储连接客户信息   
    static ServerSocket server = null; //建立服务器socket   
    static Socket socket = null; //套接字连接   
    /**  
     * Constructs  
     */  
    public ChatServer() {   
        try {   
            System.out.println("Server start...");   
            server  = new ServerSocket(port); //初始化服务器套接字   
            while (true) {   
                socket = server.accept(); //等待连接   
                System.out.println(socket.getInetAddress()+"连接\n");//得到客户机地址   
                Client client = new Client(socket); //实例化一个客户线程(其中线程Client中有Socket，这里的的Socket只是起个过度作用)   
                //   

                clients.add(client);//增加客户线程到向量中   
                client.start();//启动线程   
                notifyChatRoom(); //监视聊天室连接变化   
            }   
        } catch (Exception ex) {   
            ex.printStackTrace();//输出出错信息   
        }   
    }   
       
    public static void notifyChatRoom() { //监视客户端线程   
        StringBuffer newUser = new StringBuffer("newUser");   
        for (int i = 0; i < clients.size(); i++) {   
            Client c = (Client)clients.elementAt(i);   
            newUser.append(":"+c.name); //客户端姓名字符串   
        }   
        sendClients(newUser);//发送信息到客户端   
    }   
       
    public static void sendClients(StringBuffer message) {   
        for (int i= 0 ; i < clients.size(); i++) {   
            Client client = (Client)clients.elementAt(i);//分别得到每个客户端的连接   
            client.send(message);//发送信息   
        }   
    }   
       
    public void closeAll() { //关闭所有连接   
        while (clients.size() > 0 ) { //遍历整个Vector   
            Client client = (Client) clients.firstElement(); //得到一个客户端   
            try {   
                client.socket.close();