6.[练习]服务端反转字符串

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

实现

package cn.giteasy.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;
/**
 * 服务端
 *
 * 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：cn/giteasy/test/Test01Client.java
 */
public class Test01Server {
    public static void main(String[] args) throws IOException {
        ServerSocket server = new ServerSocket(8888);
        System.out.println("服务端启动...");
        while(true) {
            //接受客户端的请求
            final Socket socket = server.accept();
            System.out.println("收到一个请求...");
            //开启一条线程
            new Thread() {
                @Override
                public void run() {
                    try {
                        BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                        PrintStream ps = new PrintStream(socket.getOutputStream());
                        //将客户端写过来的数据读取出来
                        String line = br.readLine();
                        //链式编程反转这符串
                        line = new StringBuilder(line).reverse().toString();
                        //反转后写回去
                        ps.println(line);
                        socket.close();
                    } catch (IOException e) {                        
                        e.printStackTrace();
                    }
                }
            }.start();
        }
    }
}

package cn.giteasy.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;
/**
 * 客户端：
 *
 *
 * 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
 *
 * 服务端：cn/giteasy/test/Test02Server.java
 */
public class Test01Client {
    public static void main(String[] args) throws UnknownHostException, IOException {
        Scanner sc = new Scanner(System.in);
        //创建客户端,指定ip地址和端口号
        Socket socket = new Socket("localhost", 8888);
        //获取输出流
        BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));    //获取输入流
        //获取输出流
        PrintStream ps = new PrintStream(socket.getOutputStream());
        System.out.println("请录入一个字符串：");
        //将字符串写到服务器去
        ps.println(sc.nextLine());
        //将反转后的结果读出来
        System.out.println(br.readLine());
        socket.close();
    }
}