20220525

服务端线程类

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.Socket;

public class ServerThread extends Thread {
    private Socket soc;

    public ServerThread(Socket soc) {
        this.soc = soc;
    }

    @Override
    public void run() {
        try {
            InputStream is = soc.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            String msg;
            while ((msg = br.readLine()) != null){
                System.out.println(soc.getRemoteSocketAddress()+" has sent: "+ msg);
            }

        } catch (Exception e) {
            System.out.println(soc.getRemoteSocketAddress()+" he left~~~");
        }
    }
}

服务端

import java.net.ServerSocket;
import java.net.Socket;

public class ServerDemo2 {
    public static void main(String[] args) {
        System.out.println("=====TCP Server Started=====");
        try {
            ServerSocket ss = new ServerSocket(4444);

            while (true){
                Socket soc = ss.accept();
                //ss的accept方法返回一个套接字对象，等到了对方request，就在本地生成一个socket对应
                System.out.println(soc.getRemoteSocketAddress()+" he came~~~");

                new ServerThread(soc).start();
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

发送端

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

public class ClientDemo1 {
    public static void main(String[] args) {
        System.out.println("====TCP Client Started====");
        try {
            Socket soc = new Socket("127.0.0.1",4444);
            OutputStream os = soc.getOutputStream();
            PrintStream ps = new PrintStream(os);

            Scanner sc = new Scanner(System.in);
            String msg;
            while (true){
                System.out.println("Input your msg here:");
                msg = sc.nextLine();
                if ("exit".equals(msg)){
                    break;
                }
                ps.println(msg);
                ps.flush();
            }
//            soc.close();别主动关闭，程序跑完对服务端来说回是异常，可以用提示下线的功能
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}