Java Socket 使用多线程实现服务器与多个客户端通信

Client 类：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;


public class Client {
    private static PrintWriter pw=null;
    private static BufferedReader br=null;
    private static Socket s;
    static Scanner scanner=new Scanner(System.in);
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        try {
            Socket s=new Socket(InetAddress.getLocalHost(),8888);
            pw=new PrintWriter(new OutputStreamWriter(s.getOutputStream()));
            br=new BufferedReader(new InputStreamReader(s.getInputStream()));
            while(true){
                System.out.println("Client端请输入：&