java socket长连接

package com.paic.umap.tcp;  
  
  
import java.io.IOException;  
import java.io.InputStream;  
import java.io.ObjectInputStream;  
import java.io.ObjectOutputStream;  
import java.net.ServerSocket;  
import java.net.Socket;  
import java.util.concurrent.ConcurrentHashMap;  
  
/** 
 * C/S架构的服务端对象。 
 * <p> 
 * @since 1.0 
 */  
public class Server {  
  
    /** 
     * 要处理客户端发来的对象，并返回一个对象，可实现该接口。 
     */  
    public interface ObjectAction{  
        Object doAction(Object rev);  
    }  
      
    public static final class DefaultObjectAction implements ObjectAction{  
        public Object doAction(Object rev) {  
            System.out.println("处理并返回："+rev);  
            return rev;  
        }  
    }  
      
    public static void main(String[] args) {  
        int port = 65432;  
        Server server = new Server(port);  
        server.start();  
    }  
      
    private int port;  
    private volatile boolean running=false;  
    private long receiveTimeDelay=3000;  
    private ConcurrentHashMap<Class, ObjectAction> actionMapping = new ConcurrentHashMap<Class,ObjectAction>();  
    private Thread connWatchDog;  
      
    public Server(int port) {  
        this.port = port;  
    }  
  
    public void start(){  
        if(running)return;  
        running=true;  
        connWatchDog = new Thread(new ConnWatchDog());  
        connWatchDog.start();  
    }  
      
    @SuppressWarnings("deprecation")  
    public void stop(){  
        if(running)running=false;  
        if(connWatchDog!=null)connWatchDog.stop();
    }  
      
    public void addActionMap(Class<Object> cls,ObjectAction action){  
        actionMapping.put(cls, action);  
    }  
      
    class ConnWatchDog implements Runnable{  
        public void run(){  
            try {  
                ServerSocket ss = new ServerSocket(port,5);  
                while(running){  
                    Socket s = ss.accept();  
                    new Thread(new SocketAction(s)).start();  
                }  
            } catch (IOException e) {  
                e.printStackTrace();  
                Server.this.stop();  
            }  
              
        }  
    }  
      
    class SocketAction implements Runnable{  
        Socket s;  
        boolean run=true;  
        long lastReceiveTime = System.currentTimeMillis();  
        public SocketAction(Socket s) {  
            this.s = s;  
        }  
        public void run() {  
            while(running && run){  
                if(System.currentTimeMillis()-lastReceiveTime>receiveTimeDelay){  
                    overThis();  
                }else{  
                    try {  
                        InputStream in = s.getInputStream();  
                        if(in.available()>0){  
                            ObjectInputStream ois = new ObjectInputStream(in);  
                            Object obj = ois.readObject();  
                            lastReceiveTime = System.currentTimeMillis();  
                            System.out.println("接收：\t"+obj);  
                            ObjectAction oa = actionMapping.get(obj.getClass());  
                            oa = oa==null?new DefaultObjectAction():oa;  
                            Object out = oa.doAction(obj);  
                            if(out!=null){  
                                ObjectOutputStream oos = new ObjectOutputStream(s.getOutputStream());  
                                oos.writeObject(out);  
                                oos.flush();  
                            }  
                        }else{  
                            Thread.sleep(10);  
                        }  
                    } catch (Exception e) {  
                        e.printStackTrace();  
                        overThis();  
                    }   
                }  
            }  
        }  
          
        private void overThis() {
            if(run)run=false;
            if(s!=null){
                try {
                    s.close();  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  
            }  
            System.out.println("关闭："+s.getRemoteSocketAddress());  
        }  
          
    }  
      
}  

package com.paic.umap.tcp;  
  
import java.io.IOException;  
import java.io.InputStream;  
import java.io.ObjectInputStream;  
import java.io.ObjectOutputStream;  
import java.net.Socket;  
import java.net.UnknownHostException;  
import java.util.concurrent.ConcurrentHashMap;  
  
/** 
 *  C/S架构的客户端对象，持有该对象，可以随时向服务端发送消息。 
 * <p> 
 * @since 1.0 
 */  
public class Client {  
  
    /** 
     * 处理服务端发回的对象，可实现该接口。 
     */  
    public static interface ObjectAction {
        void doAction(Object obj,Client client);  
    }  
    public static final class DefaultObjectAction implements ObjectAction {
        public void doAction(Object obj,Client client) {  
            System.out.println("处理：\t"+obj.toString());  
        }  
    }
      
    private String serverIp;  
    private int port;  
    private Socket socket;  
    private boolean running=false;  
    private long lastSendTime;  
    private ConcurrentHashMap<Class, ObjectAction> actionMapping = new ConcurrentHashMap<Class,ObjectAction>();  
      
    public Client(String serverIp, int port) {  
        this.serverIp=serverIp;this.port=port;  
    }  
      
    public void start() throws UnknownHostException, IOException {  
        if(running)return;  
        socket = new Socket(serverIp,port);  
        System.out.println("本地端口："+socket.getLocalPort());  
        lastSendTime=System.currentTimeMillis();  
        running=true;  
        new Thread(new KeepAliveWatchDog()).start();  
        new Thread(new ReceiveWatchDog()).start();  
    }  
      
    public void stop(){  
        if(running)running=false;  
    }  
      
    /** 
     * 添加接收对象的处理对象。 
     * @param cls 待处理的对象，其所属的类。 
     * @param action 处理过程对象。 
     */  
    public void addActionMap(Class<Object> cls,ObjectAction action){  
        actionMapping.put(cls, action);  
    }  
  
    public void sendObject(Object obj) throws IOException {  
        ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());  
        oos.writeObject(obj);  
        System.out.println("发送：\t"+obj);  
        oos.flush();  
    }  
      
    class KeepAliveWatchDog implements Runnable {
        long checkDelay = 10;  
        long keepAliveDelay = 2000;  
        public void run() {  
            while(running){  
                if(System.currentTimeMillis()-lastSendTime>keepAliveDelay){  
                    try {  
                        Client.this.sendObject(new KeepAlive());  
                    } catch (IOException e) {  
                        e.printStackTrace();  
                        Client.this.stop();  
                    }  
                    lastSendTime = System.currentTimeMillis();  
                }else{  
                    try {  
                        Thread.sleep(checkDelay);  
                    } catch (InterruptedException e) {  
                        e.printStackTrace();  
                        Client.this.stop();  
                    }  
                }  
            }  
        }  
    }  
      
    class ReceiveWatchDog implements Runnable {
        public void run() {  
            while(running){  
                try {  
                    InputStream in = socket.getInputStream();  
                    if(in.available()>0){  
                        ObjectInputStream ois = new ObjectInputStream(in);  
                        Object obj = ois.readObject();  
                        System.out.println("接收：\t"+obj);  
                        ObjectAction oa = actionMapping.get(obj.getClass());  
                        oa = oa==null?new DefaultObjectAction():oa;  
                        oa.doAction(obj, Client.this);  
                    }else{  
                        Thread.sleep(10);  
                    }  
                } catch (Exception e) {  
                    e.printStackTrace();  
                    Client.this.stop();  
                }   
            }  
        }  
    }
    
    public static void main(String[] args) throws UnknownHostException, IOException {  
        String serverIp = "127.0.0.1";  
        int port = 65432;  
        Client client = new Client(serverIp,port);  
        client.start();  
    } 
}  

package com.paic.umap.tcp;  
  
import java.io.Serializable;
import java.text.SimpleDateFormat;
import java.util.Date;
  
/** 
 * 维持连接的消息对象。 
 * <p> 
 * @since 1.0 
 */  
public class KeepAlive implements Serializable{  
  
    private static final long serialVersionUID = -2813120366138988480L;  
  
    /* 覆盖该方法，仅用于测试使用。 
     * @see java.lang.Object#toString() 
     */  
    @Override  
    public String toString() {  
        return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date())+"\t维持连接包";  
    }  
  
}