JAVA基础（字符翻转）

1，字符翻转

• 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

 

客户端：

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

     * @throws IOException

     * @throws UnknownHostException

     */

    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

        

        BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));    //获取输入流

        PrintStream ps = new PrintStream(socket.getOutputStream());//获取输出流

        

        ps.println(sc.nextLine());                            //将字符串写到服务器去

        System.out.println(br.readLine());                     //将反转后的结果读出来

        

        socket.close();

    }

}

服务端：

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();                    //接受客户端的请求

            

            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();

        }

    }

}