TCP实现客户端,服务器通信(客户端发送一个字符串,服务器回馈字符串的反序)

服务器端(优先启动)

package socket;

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

public class Server {

    public static void main(String[] args) throws IOException {
        /*
         * 服务端(多线程)
         */
        ServerSocket server = new ServerSocket(5446);  //创建服务端连接,同时指定所要监听的端口号
        while(true){
            Socket socket = server.accept();   //监听端口,获得客户端对象

            /*
             * 开启一个新线程
             */
            new Thread(){
                public void run(){
                    try {
                                InputStream is = socket.getInputStream();   //获得输入流
                                OutputStream os = socket.getOutputStream();  //获得输出流

                                /*
                                 * 进行包装,方便字符串读写
                                 */
                                BufferedReader reader = 
                                new BufferedReader(new InputStreamReader(is)); 

                                PrintStream ps = new PrintStream(os);

                                //---------------------------------------------------------
                                String result = reader.readLine(); //得到客户端字符串
                                result = new StringBuilder(result).reverse().toString();  
                                //调用StringBuilder的reverse()方法,虽然StringBuilder是线程
                                // 不安全的,但是在每一个线程中不是并发的                                                                                        
                                ps.println(result); // 返回到客户端反转之后的字符串
                                socket.close(); 
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }.start();
        }



    }

}

客户端

package socket;

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

public class Client {

    public static void main(String[] args) throws IOException {
    /*
     * 客户端
     */
        Socket socket = new Socket("127.0.0.1",5446);  //创建客户端连接,指定要连接的目的ip和端口号

        InputStream is = socket.getInputStream();   //获得输入流
        OutputStream os = socket.getOutputStream();  //获得输出流

        /*
         * 进行包装,方便字符串读写
         */
        BufferedReader reader = new BufferedReader(new InputStreamReader(is)); 
        PrintStream ps = new PrintStream(os);

        //-----------------------------------------------------------------
        Scanner scanner = new Scanner(System.in);
        String string = scanner.nextLine();
        ps.println(string);  //向服务器发送字符串

        String result = reader.readLine();  //接受服务器反转后的字符串
        System.out.println(result);

        socket.close();  //关闭socket,相应的流也会关闭
    }

}