我按照视频里的打完后 按顺序执行 server正常显示，client 执行后不报错也不显示

client：

package com.socketTCP;

import java.io.IOException;

import java.io.OutputStream;

import java.io.PrintWriter;

import java.net.Socket;

import java.net.UnknownHostException;

public class client {

public static void main (String[] args) {

       try {

Socket socket = new Socket ("localhost",1718);

OutputStream os = socket.getOutputStream();

PrintWriter pw = new PrintWriter(os);

pw.write("用户名：admin ； 密码：123");

pw.flush();

socket.shutdownOutput();

pw.close();

os.close();

socket.close();

} catch (UnknownHostException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

  }

server：

package com.socketTCP;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.ServerSocket;

import java.net.Socket;

public class Server {

public static void main(String[] args) {

  try {

ServerSocket serversocket = new ServerSocket(1718);

System.out.println("服务器即将启动，等待连接");

Socket socket = serversocket.accept();

InputStream is = socket.getInputStream();

InputStreamReader isr = new InputStreamReader(is);

BufferedReader br = new BufferedReader(isr);

    String info = null;

    while((info = br.readLine())!= null){

    System.out.println("我是服务器，客户端说："+info);

    }

    socket.shutdownInput();

    br.close();

    isr.close();

    is.close();

    socket.close();

    serversocket.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}