配置Java Socket以在断开连接时快速失败？ [英] Configure a Java Socket to fail-fast on disconnect?

问题描述

我的服务器上有一个监听端口，我正在使用Java类和 Socket 接口连接，即

I have a listening port on my server that I'm connecting to using a Java class and the Socket interface, i.e.

Socket mySocket = new Socket(host,port);

然后我抓住 OutputStream ，装饰一个 PrintWriter 在autoflush模式下，我笑了 - 除非监听端口关闭。然后我得到

I then grab an OutputStream, decorate with a PrintWriter in autoflush mode and I'm laughing - except if the listening port closes. Then I get

tcp4       0      0  *.9999                 *.*                    LISTEN
tcp        0      0  127.0.0.1.45737        127.0.0.1.9999         CLOSE_WAIT

我似乎无法在程序中发现问题 - 我我尝试在套接字上使用 isConnected（）方法但它似乎不知道连接已关闭。

and I can't seem to detect the problem in the program - I've tried using the isConnected() method on the socket but it doesn't seem to know that the connection is closed.

我想在下次尝试写入Socket时意识到这个问题，以便我可以尝试重新连接并报告问题。

I want to be aware of the problem the next time I try and write to the Socket so that I can try and reconnect and report the issue.

任何建议拜托？

全部谢谢

推荐答案

设置短暂超时？

isOutputShutdown（）不能得到你想要的东西吗？

Does isOutputShutdown() not get you what you want?

你总是可以构建一个 SocketWatcher 类，它在自己的 Thread 中旋转并反复尝试写空字符串到 Socket ，直到提升为止a SocketClosedException 。

You could always build a SocketWatcher class that spins up in its own Thread and repeatedly tries to write empty strings to the Socket until that raises a SocketClosedException.

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