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());

}

}

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();

}

private String serverIp;

private int port;

private Socket socket;

private boolean running=false; //连接状态

private long lastSendTime; //最后一次发送数据的时间

//用于保存接收消息对象类型及该类型消息处理的对象

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(); //保持长连接的线程，每隔2秒项服务器发一个一个保持连接的心跳消息

new Thread(new ReceiveWatchDog()).start(); //接受消息的线程，处理消息

}

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();

}

}

}

}

}