检测tomcat servlet中的客户端断开连接？ [英] Detecting client disconnect in tomcat servlet?

问题描述

如何检测tomcat servlet请求的客户端是否已断开连接？我已经读过我应该做一个response.getOutputStream（）。print（），然后是一个response.getOutputStream（）。flush（）并捕获一个IOException，但有没有一种方法可以检测到它而不写任何数据？ / p>

编辑：

servlet发出的数据流不一定结束，但不一定有任何数据流过它（这是一个实时事件流）。我需要实际检测客户端何时断开连接，因为我需要进行一些清理工作（要释放的资源等）。如果我有可用的HttpServletRequest，如果客户端断开连接，会尝试读取抛出IOException吗？

解决方案

有没有办法可以在不写任何数据的情况下检测到这个
？

不，因为没有在TCP / IP中检测它而不写任何数据的方法。

不要担心。只需完成请求操作并编写响应即可。如果客户端已经消失，那将导致IOException：connection reset，它将被抛入servlet容器中。你无需做任何事情。

How can I detect that the client side of a tomcat servlet request has disconnected? I've read that I should do a response.getOutputStream().print(), then a response.getOutputStream().flush() and catch an IOException, but is there a way I can detect this without writing any data?

EDIT:

The servlet sends out a data stream that doesn't necessarily end, but doesn't necessarily have any data flowing through it (it's a stream of real time events). I need to actually detect when the client disconnects because I have some cleanup I have to do at that point (resources to release, etcetera). If I have the HttpServletRequest available, will trying to read from that throw an IOException if the client disconnects?

解决方案

is there a way I can detect this without writing any data?

No because there isn't a way in TCP/IP to detect it without writing any data.

Don't worry about it. Just complete the request actions and write the response. If the client has disappeared, that will cause an IOException: connection reset, which will be thrown into the servlet container. Nothing you have to do about that.

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