Java Socket编程心跳包创建实例解析

package cn.yw.socket.heart;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class Server extends Thread{
	private ServerSocket server = null;
	Object obj = new Object();
	@Override
	  public void run() {
		try{
			while(true){
				server = new ServerSocket(25535);
				Socket client = server.accept();
				synchronized(obj){
					new Thread(new Client(client)).start();
				}
			}
		}
		catch(Exception e){
			e.printStackTrace();
		}
	}
	/**
   * 客户端线程
   * @author USER
   *
   */
	class Client implements Runnable{
		Socket client;
		public Client(Socket client){
			this.client = client;
		}
		@Override
		    public void run() {
			try{
				while(true){
					ObjectInput in = new ObjectInputStream(client.getInputStream());
					Entity entity = (Entity)in.readObject();
					System.out.println(entity.getName());
					System.out.println(entity.getSex());
				}
			}
			catch(Exception e){
				e.printStackTrace();
			}
		}
	}
	/**
   *程序的入口main方法
   * @param args
   */
	public static void main(String[] args){
		new Server().start();
	}
}

package cn.yw.socket.heart;
public class Client extends Thread{
	@Override
	  public void run() {
		try{
			while(true){
				ClientSender.getInstance().send();
				synchronized(Client.class){
					//          this.wait(5000);
					Thread.sleep(2000);
				}
			}
		}
		catch(Exception e){
			e.printStackTrace();
		}
	}
	/**
   * 程序的入口main方法
   * @param args
   */
	public static void main(String[] args){
		Client client = new Client();
		client.start();
	}
}

package cn.yw.socket.heart;
import java.io.ObjectOutputStream;
import java.net.InetAddress;
import java.net.Socket;
public class ClientSender{
	private ClientSender(){
	}
	Socket sender = null;
	private static ClientSender instance;
	public static ClientSender getInstance(){
		if(instance==null){
			synchronized(Client.class){
				instance = new ClientSender();
			}
		}
		return instance;
	}
	public void send(){
		try{
			sender = new Socket(InetAddress.getLocalHost(),25535);
			while(true){
				ObjectOutputStream out = new ObjectOutputStream(sender.getOutputStream());
				Entity obj = new Entity();
				obj.setName("syz");
				obj.setSex("男");
				out.writeObject(obj);
				out.flush();
				Thread.sleep(5000);
			}
		}
		catch(Exception e){
		}
	}
}

package cn.yw.socket.heart;
import java.io.Serializable;
public class Entity implements Serializable{
	private String name;
	private String sex;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
}