终止在 Java 中调用的子进程时出现问题
在我的程序中，我调用一个 Linux 进程，读取该进程的输出，对其进行处理，然后休眠直到下一次迭代。我遇到的问题是，即使我执行 childProcess.destroy() ，我调用的进程并不总是会终止。代码如下：
while(true) {
Process childProcess = Runtime.getRuntime().exec("./getData");
InputStream input = childProcess.getInputStream();
BufferedReader inPipe = new BufferedReader(new InputStreamReader(input));
while((lineRead = inPipe.readLine()) != null) {
// do stuff
}
childProcess.destroy();
inPipe.close();
input.close();
}
绝大多数情况下，./getData 会正常运行、退出，并且我的程序会按预期运行。但是......有时它不会退出，只是坐在那里消耗CPU。我需要一种方法来消灭它。我还尝试在调用它之前添加它，但这不起作用：
Process killGetData = Runtime.getRuntime().exec("pkill -9 getData");
killGetData.destroy();
我猜测也许我陷入了内部 while() 循环中。
如有任何想法、意见和建议，我们深表谢意。预先非常感谢
约翰
From within my program, I invoke a Linux process, read the output from that process, process it and then sleep until the next iteration. The problem I'm having is that the process I call doesn't always die, even when I do a childProcess.destroy(). Here's the code:
while(true) {
Process childProcess = Runtime.getRuntime().exec("./getData");
InputStream input = childProcess.getInputStream();
BufferedReader inPipe = new BufferedReader(new InputStreamReader(input));
while((lineRead = inPipe.readLine()) != null) {
// do stuff
}
childProcess.destroy();
inPipe.close();
input.close();
}
The vast majority of the time, ./getData runs, exits gracefully and my program works as it should. But....sometimes it doesn't exit and just sits there consuming CPU. I need a way of killing it off. I also tried adding this BEFORE I invoke it but this didn't work:
Process killGetData = Runtime.getRuntime().exec("pkill -9 getData");
killGetData.destroy();
I'm guessing that perhaps I'm getting stuck in the inner while() loop.
Any thoughts, ideas and tips gratefully received. Many thanks in advance
John
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您必须关闭子进程的输入管道才能终止它。添加
（它是父进程的输出流，但子进程的输入）。
[编辑] 另外不要忘记调用
childProcess.waitFor()来清理僵尸进程。You must close the input pipe to the child process to terminate it. Add
(it's an output stream for the parent process but the input for the child).
[EDIT] Also don't forget to call
childProcess.waitFor()to clean up the zombie process.