Test_Java_网络编程（客户端向服务器发送字符串，服务器将字符串反转后发送给客户端）

需求： 客户端向服务器写字符串(键盘录入),服务器(多线程)将字符串反转后写回,客户端再次读取到是反转后的字符串

Test1_Client.java

package com.soar.test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;

public class Test1_Client {
    /*
     * 客户端向服务器写字符串(键盘录入),服务器(多线程)将字符串反转后写回,
     * 客户端再次读取到是反转后的字符串
     */
    public static void main(String[] args) throws UnknownHostException, IOException {
        Scanner sc = new Scanner(System.in);        //创建键盘录入对象
        Socket socket = new Socket("127.0.0.1", 54321); //创建客户端，指定ip地址和端口号

        //获取输入流
        BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        //获取输出流
        PrintStream ps = new PrintStream(socket.getOutputStream());

        ps.println(sc.nextLine());      //将字符串写到服务器中
        System.out.println(br.readLine());  //将反转后的结果输出来

        socket.close();
    }

}

Test1_Server.java

package com.soar.test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Test1_Server {

    public static void main(String[] args) throws IOException {
        ServerSocket server = new ServerSocket(54321);
        System.out.println("服务器启动，绑定54321端口");

        while(true){
            final Socket socket = server.accept();

            new Thread(){               //开启一条线程
                public void run(){
                    try {
                        BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream())); //获取输入流
                        PrintStream ps = new PrintStream(socket.getOutputStream()); //获取输出流

                        String line = br.readLine();        //将客户端写过来的数据读取出来
                        line = new StringBuilder(line).reverse().toString();    //链式编程
                        ps.println(line);                   //反转后写回去
                        socket.close();
                    } catch (IOException e) {

                        e.printStackTrace();
                    }
                }
            }.start();
        }
    }

}