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）

分手后的思念是犯贱 2022-06-09 12:57 153阅读 0赞

**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();
            }
        }
    
    }