//这是客户端
package com.test;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.net.Socket;

import java.net.UnknownHostException;

public class Client {

    public Client() {

        try {

            Socket s = new Socket("127.0.0.1",9999);

            PrintWriter pw = new PrintWriter(s.getOutputStream(),true);

            InputStreamReader isr = new InputStreamReader(System.in);

            BufferedReader br = new BufferedReader(isr);

            InputStreamReader isr2 = new InputStreamReader(s.getInputStream());

            BufferedReader br2 = new BufferedReader(isr2);

             while (true) {

                System.out.println("请输入你对服务器的话");

                String info = br.readLine();

                pw.println(info);

                String res = br2.readLine();

                System.out.println("服务器说"+ res);

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    public static void main(String[] args) {

        Client client = new Client();

    }

}

//这是服务器
package com.test;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.net.ServerSocket;

import java.net.Socket;

public class Server {

    public static void main(String[] args) {

        Server server =new Server();

    }

    public Server(){

        try {

            System.out.println("服务器在9999监听");

            ServerSocket ss    = new ServerSocket(9999);

            Socket s = ss.accept();

            InputStreamReader isr = new InputStreamReader(s.getInputStream());

            BufferedReader br = new BufferedReader(isr);

            PrintWriter pw = new PrintWriter(s.getOutputStream(),true);

            InputStreamReader isr2 = new InputStreamReader(System.in);

            BufferedReader br2 = new BufferedReader(isr2);     

            while (true) {

                String infoFromClient = br.readLine();

                System.out.println("客户端发来"+infoFromClient);

                System.out.println("请输入你想对客户端说的话");

                String     response = br2.readLine();

                pw.println(response);

            }

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

}