[英]Java ServerSocket and Android LocalServerSocket
我已经实现了我自己的android服务,如下所示
public class MyService extends Service {
private static final String TAG = "MyService";
private Server mServer;
private LocalServerSocket server;
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
Log.d(TAG, "onCreate");
mServer = new Server();
mServer.start();
}
@Override
public void onDestroy() {
Log.d(TAG, "onDestroy");
if(server != null){
try {
server.close();
} catch (IOException e) {
Log.d(TAG, "exception in server close");
e.printStackTrace();
}
}
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.d(TAG, "onStart");
return START_STICKY;
}
class Server extends Thread {
@Override
public void run() {
try {
server = new LocalServerSocket("my.socket");
while (true) {
LocalSocket receiver;
try{
receiver = server.accept();
}catch(SocketException e){
Log.d(TAG, "SocketException");
break;
}
catch(IOException e){
Log.d(TAG, "IOException");
break;
}
if (receiver != null) {
Log.d(TAG, "Got Data in receiver");
}
receiver.close();
}
} catch (IOException e) {
Log.d(TAG, "one more");
e.printStackTrace();
}
}
}
}
我面临的问题是,如果我的LocalServerSocket阻塞了accept(),那么在OnDestroy()中对server.close()的调用将不会引发SocketException。 因此,下次启动服务时,我会收到“地址已在使用中异常”。 如果我使用java.net.Socket而不是LocalServerSocket,则会得到所需的行为。 我想知道为什么LocalServerSocket的行为不同于Java Socket。 就我而言,我该如何退出while循环。
我遇到了同样的问题,并以此方式“解决”了。 线程run()方法正在检查“!isInterrupted()”。 我添加到侦听器线程的方法“ stopSocketServer()”将线程标记为interrupt(),然后向其自身发出连接请求以触发accept()方法。
/**
* Executed if thread is started.
*/
public void run() {
try {
// leave while loop if thread is marked for interrupt.
while (!isInterrupted()) {
LocalSocket clientSocket = serverSocket.accept();
if (!isInterrupted()) {
threadPool.execute(new ClientProcessor(clientSocket));
}
}
} catch (IOException e) {
if (!isInterrupted()) {
Log.e(TAG, "socket listener terminated", e);
}
} finally {
try {
if (serverSocket != null) {
serverSocket.close();
}
if (threadPool != null) {
threadPool.shutdownNow();
}
Log.i(TAG, "socket listener stopped");
} catch (IOException e) {
}
}
}
public void stopSocketServer() {
if (serverSocket != null) {
try {
// mark thread as interrupted
interrupt();
// now send connect request to myself to trigger leaving accept()
LocalSocket ls = new LocalSocket();
ls.connect(serverSocket.getLocalSocketAddress());
ls.close();
} catch (IOException e) {
Log.e(TAG, "stopSocketServer failed", e);
}
}
}
从您发布的代码来看,您的LocalServerSocket server
看起来永远是null
而onDestroy()
不会将其关闭。 另外,关闭套接字通常不应引发IOException-但是,如果同时关闭套接字, accept()
会抛出该异常。
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