调用Runtime.exec时捕获stdout [英] Capturing stdout when calling Runtime.exec

问题描述

在客户端计算机上遇到网络问题时，我希望能够运行一些命令行并将结果通过电子邮件发送给我自己。

When experiencing networking problems on client machines, I'd like to be able to run a few command lines and email the results of them to myself.

我发现Runtime.exec将允许我执行任意命令，但收集字符串中的结果更有趣。

I've found Runtime.exec will allow me to execute arbitrary commands, but Collecting the results in a String is more interesting.

我意识到我可以将输出重定向到文件，并且然后从文件中读取，但我的蜘蛛侠意识告诉我有一种更优雅的方式。

I realize I could redirect output to a file, and then read from the file, but my spidey sense is telling me there's a more elegant way of doing it.

建议？

推荐答案

您需要捕获进程中的std out和std err。然后，您可以将std写入文件/邮件或类似文件。

You need to capture both the std out and std err in the process. You can then write std out to a file/mail or similar.

参见这篇文章了解更多信息，特别注意 StreamGobbler 在单独的线程中捕获stdout / err的机制。这对于防止阻塞至关重要，如果你没有正确执行，就会成为众多错误的来源！

See this article for more info, and in particular note the StreamGobbler mechanism that captures stdout/err in separate threads. This is essential to prevent blocking and is the source of numerous errors if you don't do it properly!

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