java基础案例9-2字符串反转

//第一个项目
package com.itheima;

import java.net.*;
import java.io.*;

class TCPSever{
    private static final int PORT = 7788;
    public static void listen()throws Exception{
        ServerSocket serverSocket = new ServerSocket(PORT);
        while(true)
        {
            final Socket client = serverSocket.accept();//服务器接收端
            new Thread(){
                public void run(){
                    OutputStream os;
                    InputStream it;
                    try{
                        os = client.getOutputStream();
                        System.out.println("开始与客户端交互数据");
                        os.write(("连接成功").getBytes());

                        //字符串反转
                        it = client.getInputStream();
                        byte[] buf = new byte[1024];
                        int len = it.read(buf);
                        System.out.println("进行字符反转");
                        String str = new String(buf, 0, len);
                        StringBuffer st = new StringBuffer();
                        st.append(str);
                        os.write(("反转后的字符串为:"+ st.reverse()).getBytes());

                        Thread.sleep(5000);
                        System.out.println("结束与客户端交互数据");
                        os.close();
                        client.close();
                    }catch(Exception e)
                    {
                        e.printStackTrace();
                    }
                }
            }.start();
        }
    }
}

public class Main{
    public static void main(String[] args)throws Exception
    {
        new TCPSever().listen();
    }
}



//第二个项目
package com.itheima;

import java.net.*;
import java.io.*;
import java.util.Scanner;

class TCPClient{
    private static final int PORT = 7788;
    static Scanner in = new Scanner(System.in);
    public void connect()throws Exception{
        Socket client = new Socket(InetAddress.getLocalHost(), PORT);
        InputStream is = client.getInputStream();

        byte[] buf = new byte[1024];
        int len = is.read(buf);
        System.out.println(new String(buf, 0, len));

        //传出字符串
        OutputStream ot = client.getOutputStream();
        String str = in.next();
        ot.write((str).getBytes());

        //传入字符串
        byte[] buff = new byte[1024];
        int len1 = is.read(buff);
        String st = new String(buff, 0, len1);
        System.out.println(st);
        client.close();
    }
}

public class Main{
    public static void main(String[] args)throws Exception{
        new TCPClient().connect();
    }
}