Socket编程客户端给服务端发送消息，服务端回复

1、创建服务端

package server_scoket;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class Server_Socket {

   public static void main(String[] args) throws IOException {
       //创建服务端，绑定端口8081
       ServerSocket server = new ServerSocket(8081) ;
       System.out.println("Scoket 服务启动成功。。。。。。。。。。。。。");
       //阻塞状态、监听服务端口8081
       Socket client = server.accept() ;
       System.out.println("来访问客户端信息：" + " 客户端ip："+client.getInetAddress()
               + "客户端端口："+client.getInetAddress().getLocalHost() + "已连接服务器" );

BufferedReader bReader = new BufferedReader(new InputStreamReader(client.getInputStream()));
//读取客户端发送来的消息
       String msg = bReader.readLine();
       System.out.println("客户端发来的消息：" + msg);

BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(client.getOutputStream()));
bw.write("服务端返回的信息: "+msg+"1"+"\n");
bw.flush();
}

}

启动服务端，服务端显示信息如下：
Scoket 服务启动成功。。。。。。。。。。。。。

2、创建服务端

package server_scoket;

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.net.Socket;
import java.net.UnknownHostException;

public class Client {

public static void main(String[] args) {

       try {
           //指定连接服务端的IP 端口
           Socket socket = new Socket("127.0.0.1" , 8081) ;
           //创建IO输入输出流
           InputStream iStream = socket.getInputStream();        //输入流
           OutputStream oStream = socket.getOutputStream() ;   //输出流

           BufferedWriter bWriter = new BufferedWriter(new OutputStreamWriter(oStream)) ;

           //向服务器端发送一条消息
           bWriter.write("测试客户端和服务器通信，服务器接收到消息返回到客户端\n") ;
           bWriter.flush();

           //读取服务器返回的消息
           BufferedReader bReader = new BufferedReader(new InputStreamReader(iStream)) ;
           String msg = bReader.readLine();

           System.out.println(msg);
       } catch (UnknownHostException e) {
           e.printStackTrace();
       } catch (IOException e) {
           e.printStackTrace();
       }
   }

}

启动客户端，给服务器发消息，服务端控制台显示
来访问客户端信息：客户端ip：/127.0.0.1客户端端口：AUTOBVT-O9SA5CQ/18.141.65.119已连接服务器客户端发来的消息：测试客户端和服务器通信，服务器接收到消息返回到客户端

服务器回给客户端的消息
服务端返回的信息: 测试客户端和服务器通信，服务器接收到消息返回到客户端1