在 GWT 中处理连接超时
我正在使用 GWT 和 PHP，并且通过 RequestBuilder 类进行通信， 但我需要处理是否存在互联网连接并显示一些消息 但是 RequestBuilder 类支持 RequestCallback 接口，无法处理互联网 连接是否存在。解决办法是什么？
I am using GWT and PHP and communication is via the RequestBuilder class,
but I need to handle internet connection present or not and show some message
but RequestBuilder class supports RequestCallback interface which cannot handle internet
connection present or not. What is the solution?
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RequestCallback .sendRequest（或只是send()) 抛出RequestException- 我的猜测是这是失败点无网络连接的情况下。此外，<传递给 send(Request) 方法的 code>RequestCallback 还有一个onError方法如下：您可能应该自己做一些测试，看看何时抛出
RequestException异常以及何时控制到达onError- 尽管通常您使用相同的代码/方法来处理这两种情况，所以哪个处理什么可能并不重要，只是它们一起处理所有事情:)RequestCallback.sendRequest(or justsend()) throwsRequestException- my guess would be that this is the point of failure in case of no net connection. Additionally, theRequestCallbackyou pass to the send(Request) method also has anonErrormethod which is:You should probably do some testing yourself to see when the
RequestExceptionexception is being thrown and when the control gets toonError- although, usually you use the same code/method to handle both cases, so it might not matter which handles what, just that together they handle everything :)