Question

感谢阅读！

背景我正在为服务器开发一个Android客户端，其中需求是应用程序，需要与基于 WebSockets的服务器来回连续交换消息。

实施：对于客户端，我使用适用于Android的weberknecht's WebSocket客户端库，而服务器基于Tornado。

问题： 目前，我通过生成initWebSocketClient在onCreate中调用AsyncTask。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

有人可以帮助我吗？

更新：添加AutoBahn（适用于Android的WebSocket客户端库）实施细节：

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

Answer 1

以下是我将如何开始排除故障的方法：

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和，则通过3G连接，则不会发生这种情况。在这种情况下，您尝试从WAN连接到内部 IP地址，但这不起作用。
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192.168.207.84:8080处的服务器到达。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，则表示您的服务器没有响应。当然，这假设您的PC与您的Wifi网络位于相同的子网。
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，并确保您的模拟器处于（IP）桥接模式。
< / LI>
总而言之，主原因超时通常是由于缺乏服务器可用性（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。

Answer 2

据我所知，Weberknecht只支持Hybi-10，而不是最终的RFC6455规范，更有问题的是它是否在主（UI）线程上建立网络。这通常是个坏主意，并且在Android＆gt; 2上会失败。

对于Android原生应用，有适用于Android的高速公路WebSockets

https://github.com/oberstet/AutobahnAndroid

它支持最终的RFC6455，与UI和服务应用程序很好地集成，通过WebSockets提供RPC和PubSub等等。在GitHub上查看项目README。

免责声明：我是高速公路的作者。

android websocket客户端超时

2 个答案: