Socket心跳包编程

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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {

    public static void main(String[] args) throws Exception {
//        接收心跳包的Server
        int port = 4000;
        byte ipAddressTemp[] = {127, 0, 0, 1};
        InetAddress ipAddress = InetAddress.getByAddress(ipAddressTemp);

        //创建ServerSocket
        ServerSocket serverSocket = new ServerSocket(port);

        System.out.println("Server start...");
        //调用服务器的accept（）进行阻塞（程序会在这等待），当有申请连接时会打开阻塞并返回一个socket
        Socket socket = serverSocket.accept();
        //socket输入流BufferedReader socketIn
        BufferedReader socketIn = new BufferedReader(new InputStreamReader(socket.getInputStream()));

        String inTemp = null;
        boolean end = true;
        while (end) {
            inTemp = socketIn.readLine();
            if (inTemp != null) {
                System.out.println(inTemp);
            }
        }

        socketIn.close();
        socket.close();
        serverSocket.close();
    }
}

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

public class Client implements Runnable{
    //调试时要先启动服务端，客户端查不到服务端就启动不了
    public static void main(String[] args) throws Exception {
//        发送心跳包client
        int port = 4000;
        byte ipAddressTemp[] = {127, 0, 0, 1};
        InetAddress ipAddress = InetAddress.getByAddress(ipAddressTemp);

        //设置socket
        socket = new Socket(ipAddress, port);
        System.out.println("Client start...");
        startThreadSocket();
    }

//    心跳包
        private static Thread thread;//循环发送心跳包的线程
        private static Socket socket;//与服务器建立连接的socket对象
        private static OutputStream outputStream;//输出流，用于发送心跳包
        private static final String socketContent = "Heat Beat!"+"n";//这里为与服务器协商的特殊字符串，用于识别是发送的心跳信息

        public static void startThreadSocket() throws IOException {
            try{
                if(!socket.getKeepAlive())
                    socket.setKeepAlive(true);//true,若长时间没有则断开
                if(!socket.getOOBInline())
                    socket.setOOBInline(true);//true，允许发送紧急数据，不做处理
                outputStream = socket.getOutputStream();//获得socket的输出流
                Client client = new Client();
                //开启三个客户端线程
                new Thread(client,"1").start();
                new Thread(client,"2").start();
                new Thread(client,"3").start();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }


        @Override
        public void run() {
            while (true){
                try{
                    outputStream.write((Thread.currentThread().getName()+"号客户端发来的心跳包"+socketContent).getBytes("UTF-8"));
                    outputStream.flush();//刷新缓存，让server能够接受到数据
                    Thread.sleep(10*1000);//10s发送一次心跳
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }