java用ServerSocket类结合io流实现一对一聊天（java实现简单的TCP聊天程序只能用telnet连接后方可使用）

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

public class ServerSocketDemo {
//一对一发消息
public static void test3(){
//服务端
System.out.println("等待连接中。。。");
ServerSocket ss;
try {
ss = new ServerSocket(6666);
while(true){
Socket a = ss.accept();
System.out.println(a.getInetAddress()+" 已连接成功！");
OutputStream os = a.getOutputStream();
PrintWriter pw = new PrintWriter(os);
pw.write("欢迎来到"+"\r\n");
pw.write("小询聊天世界"+"\r\n");
pw.flush();
//一对一互相发送数据 服务端先发送消息 若有一方不回复则不能继续聊天

Scanner scanner = new Scanner(System.in);
String wl = null;
InputStream is = a.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
while (scanner.hasNextLine()) {
String str = scanner.nextLine();
pw.println("服务端："+str);
System.out.println("我："+str);
pw.flush();
String clien = br.readLine();
System.out.println("客户端："+clien);
pw.println("我："+clien); pw.flush();
}
}

} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void main(String[] args) {
test3();
}
}