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：");
                String str = scanner.next();
                pw.println(str);
                pw.flush();
                String string=br.readLine();
                System.out.println("Client读到："+string);
                if(str.equals("exit")){
                    break;
                }
            } 
        }catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
        }
        try {
            br.close();
            pw.close();
        } catch (IOException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
        }
    }
}

Server类：

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


public class Server {
//    private static BufferedReader br=null;
//    private static PrintWriter pw=null;
    private static ServerSocket ss;
    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 {
        	int count=0;
        	ss=new ServerSocket(8888);
            System.out.println("服务器正常启动。。。。");
//            br=new BufferedReader(new InputStreamReader(s.getInputStream()));
//            pw=new PrintWriter(new OutputStreamWriter(s.getOutputStream()));
            while(true){
//                String string=br.readLine();
//                System.out.println("Server读到："+string);
//                System.out.println("Server端请输入：");
//                String str=scanner.next();
//                pw.println(str);
//                pw.flush();
//                if(str.equals("exit")){
//                    break;
//                }
            	s=ss.accept();//阻塞方法
            	ServerThread sst = new ServerThread(s);
            	sst.start();
            	count++;
            	System.out.println("客户端的数量: " + count); 
            	System.out.println("连接成功"+s.getRemoteSocketAddress());
            }
        } catch (Exception e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
        }
//        try {
//            pw.close();
//            br.close();
//        } catch (IOException e1) {
//                // TODO Auto-generated catch block
//            e1.printStackTrace();
//        }
    }
}

ServerThread类：

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


public class ServerThread extends Thread{
	static Scanner scanner=new Scanner(System.in);
	  Socket s = null;
	  BufferedReader br = null; 
	  PrintWriter pw = null;
	  public ServerThread(Socket s){ 
	    this.s = s; 
	  }
	
	public void run(){
		
		try{
			//String string=br.readLine();
			br=new BufferedReader(new InputStreamReader(s.getInputStream()));
            pw=new PrintWriter(new OutputStreamWriter(s.getOutputStream()));
			String string = null;
			while (true)
			{ string  = br.readLine();
				System.out.println("Server读到："+string);
             System.out.println("Server端请输入：");
             String str=scanner.next();
             pw.println(str);
             pw.flush();
             if(str.equals("exit")){
                 break;
             }}
		}
		catch (Exception e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
		}
		try {
            pw.close();
            br.close();
        } catch (IOException e1) {
                // TODO Auto-generated catch block
            e1.printStackTrace();
        }
	}
}