谢谢阅读！
背景：
我正在为服务器开发一个Android客户端,其中需求是app,需要与基于WebSockets的服务器来回连续交换消息.
实现：对于客户端,我使用适用于Android的weberknecht’s WebSocket客户端库,而服务器是基于Tornado的.
问题：
目前,我通过生成AsyncTask来调用onCreate中的initWebSocketClient.但是,我一直收到客户端超时异常.
Android客户端：
private void initWebSocketClient() {
Log.e(TAG,"initWebSocketClient");
try {
URI url = new URI("ws://192.168.207.84:8080/");
WebSocket websocket = new WebSocketConnection(url);
// Register Event Handlers
websocket.setEventHandler(new WebSocketEventHandler() {
public void onOpen()
{
Log.e(TAG,"--open");
}
public void onMessage(WebSocketMessage message)
{
Log.e(TAG,"--received message: " + message.getText());
}
public void onClose()
{
Log.e(TAG,"--close");
}
});
// Establish WebSocket Connection
websocket.connect();
// Send UTF-8 Text
websocket.send("hello world");
// Close WebSocket Connection
websocket.close();
}
catch (WebSocketException wse) {
wse.printStackTrace();
}
catch (URISyntaxException use) {
use.printStackTrace();
}
}
龙卷风服务器：
#!/usr/bin/env python
import tornado.ioloop
import tornado.web
import tornado.websocket
class EchoWebSocketHandler(tornado.websocket.WebSocketHandler):
def open(self):
print "WebSocket opened"
def on_message(self,message):
self.write_message(u"You said: " + message)
def on_close(self):
print "WebSocket closed"
application = tornado.web.Application([
(r"/",EchoWebSocketHandler),])
if __name__ == "__main__":
application.listen(8080)
tornado.ioloop.IOLoop.instance().start()
客户超时例外：
01-31 19:28:01.367: W/System.err(5668): de.roderick.weberknecht.WebSocketException: error while creating socket to ws://192.168.207.84:8080/ 01-31 19:28:01.386: W/System.err(5668): at de.roderick.weberknecht.WebSocketConnection.createSocket(WebSocketConnection.java:244) 01-31 19:28:01.386: W/System.err(5668): at de.roderick.weberknecht.WebSocketConnection.connect(WebSocketConnection.java:83) 01-31 19:28:01.386: W/System.err(5668): at com.sagar.websockclient.MainActivity.initWebSocketClient(MainActivity.java:55) 01-31 19:28:01.390: W/System.err(5668): at com.sagar.websockclient.MainActivity.access$0(MainActivity.java:30) 01-31 19:28:01.390: W/System.err(5668): at com.sagar.websockclient.MainActivity$WebSocketTask.doInBackground(MainActivity.java:75) 01-31 19:28:01.390: W/System.err(5668): at com.sagar.websockclient.MainActivity$WebSocketTask.doInBackground(MainActivity.java:1) 01-31 19:28:01.390: W/System.err(5668): at android.os.AsyncTask$2.call(AsyncTask.java:264) 01-31 19:28:01.390: W/System.err(5668): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 01-31 19:28:01.390: W/System.err(5668): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 01-31 19:28:01.390: W/System.err(5668): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 01-31 19:28:01.390: W/System.err(5668): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 01-31 19:28:01.390: W/System.err(5668): at java.lang.Thread.run(Thread.java:856) 01-31 19:28:01.390: W/System.err(5668): Caused by: java.net.ConnectException: Failed to connect to /192.168.207.84 (port 8080): connect Failed: ETIMEDOUT (Connection timed out) 01-31 19:28:01.390: W/System.err(5668): at libcore.io.IoBridge.connect(IoBridge.java:114) 01-31 19:28:01.394: W/System.err(5668): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192) 01-31 19:28:01.394: W/System.err(5668): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) 01-31 19:28:01.394: W/System.err(5668): at java.net.Socket.startupSocket(Socket.java:566) 01-31 19:28:01.394: W/System.err(5668): at java.net.Socket.tryAllAddresses(Socket.java:127) 01-31 19:28:01.394: W/System.err(5668): at java.net.Socket.(Socket.java:177) 01-31 19:28:01.394: W/System.err(5668): at java.net.Socket.(Socket.java:149) 01-31 19:28:01.394: W/System.err(5668): at de.roderick.weberknecht.WebSocketConnection.createSocket(WebSocketConnection.java:238) 01-31 19:28:01.394: W/System.err(5668): ... 11 more 01-31 19:28:01.394: W/System.err(5668): Caused by: libcore.io.ErrnoException: connect Failed: ETIMEDOUT (Connection timed out) 01-31 19:28:01.398: W/System.err(5668): at libcore.io.Posix.connect(Native Method) 01-31 19:28:01.398: W/System.err(5668): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85) 01-31 19:28:01.398: W/System.err(5668): at libcore.io.IoBridge.connectErrno(IoBridge.java:127) 01-31 19:28:01.398: W/System.err(5668): at libcore.io.IoBridge.connect(IoBridge.java:112) 01-31 19:28:01.398: W/System.err(5668): ... 18 more
有人可以帮帮我吗？
更新：添加AutoBahn(适用于Android的WebSocket客户端库)实现细节：
AutoBahn客户端
private void connect2() {
mConnection = new WebSocketConnection();
final String wsuri = "ws://192.168.0.137:8888/";
String TAG = "ArticlesListActivity";
try {
mConnection.connect(wsuri,new WebSocketHandler() {
@Override
public void onOpen() {
Log.e(TAG,"Connected to: " + wsuri);
}
@Override
public void onTextMessage(String payload) {
Log.e(TAG,"Message recieved = " + payload);
}
@Override
public void onClose(int code,String reason) {
Log.e(TAG,"Connection Lost.");
}
});
} catch (WebSocketException e) {
Log.d(TAG,e.toString());
}
}
使用此库 – 我能够立即连接到服务器,连接丢失. (请参阅下面的“AutoBahn客户端日志”.切换回weberknecht工作正常.我没有明确地在任何地方调用mConnection.disconnect().所以我不知道连接是如何终止的.
AutoBahn客户端日志
02-27 14:27:36.605: D/de.tavendo.autobahn.WebSocketConnection(27701): created 02-27 14:27:36.656: D/dalvikvm(27701): GC_FOR_ALLOC freed 164K,4% free 9247K/9543K,paused 17ms 02-27 14:27:36.671: D/dalvikvm(27701): GC_FOR_ALLOC freed 7K,4% free 9368K/9735K,paused 14ms 02-27 14:27:36.671: D/de.tavendo.autobahn.WebSocketReader(27701): created 02-27 14:27:36.675: D/de.tavendo.autobahn.WebSocketConnection(27701): WS reader created and started 02-27 14:27:36.675: D/de.tavendo.autobahn.WebSocketReader(27701): running 02-27 14:27:36.675: D/de.tavendo.autobahn.WebSocketWriter(27701): created 02-27 14:27:36.675: D/de.tavendo.autobahn.WebSocketConnection(27701): WS writer created and started 02-27 14:27:36.769: D/de.tavendo.autobahn.WebSocketReader(27701): run() : ConnectionLost 02-27 14:27:36.773: D/de.tavendo.autobahn.WebSocketReader(27701): ended 02-27 14:27:36.777: D/de.tavendo.autobahn.WebSocketConnection(27701): opening handshake received 02-27 14:27:36.777: E/ArticlesListActivity(27701): Connected to: ws://192.168.0.137:8888/ 02-27 14:27:36.781: D/de.tavendo.autobahn.WebSocketConnection(27701): fail connection [code = 3,reason = WebSockets connection lost 02-27 14:27:36.784: D/de.tavendo.autobahn.WebSocketReader(27701): quit 02-27 14:27:36.788: D/de.tavendo.autobahn.WebSocketWriter(27701): ended 02-27 14:27:36.792: E/ArticlesListActivity(27701): Connection Lost. 02-27 14:27:36.792: D/de.tavendo.autobahn.WebSocketConnection(27701): worker threads stopped
解决方法
以下是我将如何开始对此进行故障排除：
>您是否尝试在手机(设备)或模拟器上执行此操作？如果您尝试在手机上执行此操作并通过3G连接,则不会发生这种情况.在这种情况下,您尝试从WAN连接到无法正常工作的内部IP地址.
>再次假设您在设备上执行此操作,如果您通过Wifi连接,那么这是另一个故事.确保可以通过192.168.207.84:8080联系服务器.一种快速测试连接的方法(来自您的PC)：
telnet 192.168.207.84 8080
如果超时,您知道您的服务器没有响应.当然,这假设您的PC与Wifi网络位于同一子网中.
>如果您尝试从模拟器执行此操作,请按照[2]中的步骤确保服务器可访问,并确保模拟器处于(IP)桥接模式.
总而言之,超时通常发生的主要原因是缺乏服务器可用性(即缺乏连接性).您没有提到网络的详细信息,因此我根据您尝试连接的IP(192.168.207.84)做了一些假设.
