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BackService.java
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BackService.java
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package danxx.library.socket;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.ref.WeakReference;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Arrays;
import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.os.RemoteException;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;
/**
* Created by dawish on 2017/7/24.
* 由于移动设备的网络的复杂性,经常会出现网络断开,如果没有心跳包的检测,
* 客户端只会在需要发送数据的时候才知道自己已经断线,会延误,甚至丢失服务器发送过来的数据。
*/
public class BackService extends Service {
private static final String TAG = "danxx";
/**心跳频率*/
private static final long HEART_BEAT_RATE = 3 * 1000;
/**服务器ip地址*/
public static final String HOST = "192.168.123.27";// "192.168.1.21";//
/**服务器端口号*/
public static final int PORT = 9800;
/**服务器消息回复广播*/
public static final String MESSAGE_ACTION="message_ACTION";
/**服务器心跳回复广播*/
public static final String HEART_BEAT_ACTION="heart_beat_ACTION";
/**读线程*/
private ReadThread mReadThread;
private LocalBroadcastManager mLocalBroadcastManager;
/***/
private WeakReference<Socket> mSocket;
// For heart Beat
private Handler mHandler = new Handler();
/**心跳任务,不断重复调用自己*/
private Runnable heartBeatRunnable = new Runnable() {
@Override
public void run() {
if (System.currentTimeMillis() - sendTime >= HEART_BEAT_RATE) {
boolean isSuccess = sendMsg("HeartBeat");//就发送一个\r\n过去 如果发送失败,就重新初始化一个socket
if (!isSuccess) {
mHandler.removeCallbacks(heartBeatRunnable);
mReadThread.release();
releaseLastSocket(mSocket);
new InitSocketThread().start();
}
}
mHandler.postDelayed(this, HEART_BEAT_RATE);
}
};
private long sendTime = 0L;
/**
* aidl通讯回调
*/
private IBackService.Stub iBackService = new IBackService.Stub() {
/**
* 收到内容发送消息
* @param message 需要发送到服务器的消息
* @return
* @throws RemoteException
*/
@Override
public boolean sendMessage(String message) throws RemoteException {
return sendMsg(message);
}
};
@Override
public IBinder onBind(Intent arg0) {
return iBackService;
}
@Override
public void onCreate() {
super.onCreate();
new InitSocketThread().start();
mLocalBroadcastManager=LocalBroadcastManager.getInstance(this);
}
public boolean sendMsg(final String msg) {
if (null == mSocket || null == mSocket.get()) {
return false;
}
final Socket soc = mSocket.get();
if (!soc.isClosed() && !soc.isOutputShutdown()) {
new Thread(new Runnable() {
@Override
public void run() {
try {
OutputStream os = soc.getOutputStream();
String message = msg + "\r\n";
os.write(message.getBytes());
os.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
sendTime = System.currentTimeMillis();//每次发送成数据,就改一下最后成功发送的时间,节省心跳间隔时间
} else {
return false;
}
return true;
}
private void initSocket() {//初始化Socket
try {
Socket so = new Socket(HOST, PORT);
mSocket = new WeakReference<Socket>(so);
mReadThread = new ReadThread(so);
mReadThread.start();
mHandler.postDelayed(heartBeatRunnable, HEART_BEAT_RATE);//初始化成功后,就准备发送心跳包
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 心跳机制判断出socket已经断开后,就销毁连接方便重新创建连接
* @param mSocket
*/
private void releaseLastSocket(WeakReference<Socket> mSocket) {
try {
if (null != mSocket) {
Socket sk = mSocket.get();
if (!sk.isClosed()) {
sk.close();
}
sk = null;
mSocket = null;
}
} catch (IOException e) {
e.printStackTrace();
}
}
class InitSocketThread extends Thread {
@Override
public void run() {
super.run();
initSocket();
}
}
// Thread to read content from Socket
class ReadThread extends Thread {
private WeakReference<Socket> mWeakSocket;
private boolean isStart = true;
public ReadThread(Socket socket) {
mWeakSocket = new WeakReference<Socket>(socket);
}
public void release() {
isStart = false;
releaseLastSocket(mWeakSocket);
}
@Override
public void run() {
super.run();
Socket socket = mWeakSocket.get();
if (null != socket) {
try {
InputStream is = socket.getInputStream();
byte[] buffer = new byte[1024 * 4];
int length = 0;
while (!socket.isClosed() && !socket.isInputShutdown()
&& isStart && ((length = is.read(buffer)) != -1)) {
if (length > 0) {
String message = new String(Arrays.copyOf(buffer,
length)).trim();
Log.e(TAG, message);
//收到服务器过来的消息,就通过Broadcast发送出去
if(message.equals("ok")){//处理心跳回复
Intent intent=new Intent(HEART_BEAT_ACTION);
mLocalBroadcastManager.sendBroadcast(intent);
}else{
//其他消息回复
Intent intent=new Intent(MESSAGE_ACTION);
intent.putExtra("message", message);
mLocalBroadcastManager.sendBroadcast(intent);
}
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
@Override
public void onDestroy() {
super.onDestroy();
mHandler.removeCallbacks(heartBeatRunnable);
mReadThread.release();
releaseLastSocket(mSocket);
}
}