使用Java 7中的ProcessBuilder构建流程管道 [英] Building a process pipe with ProcessBuilder in Java 7

问题描述

我一直试图弄清楚如何使用新的 ProcessBuilder 在Java中管理一些进程。我找不到一个合适的例子来说明我想要做什么，当我尝试自己做这个过程时，这个过程就会挂起。我将非常感谢一些运行相当于 cat test.txt |的代码的简单示例wc ，但不是通过shell。

I've been trying to figure out how to pipe a few processes in Java using the new ProcessBuilder. I can't find a suitable example of what I want to do and when I try to do it myself the process just hangs. I would appreciate a very simple example of some code that runs the equivalent of cat test.txt | wc, but not through a shell.

- 更新 -

好的，只是澄清一下。我知道有一些方法可以通过读写流来模拟管道。我想知道是否通过 redirectInput 和 redirectOutput Java 7中引入的方法。

OK, just to clarify. I know there are ways to simulate a pipe by reading and writing streams. I'm wondering if that's done in some automatic way by the redirectInput and redirectOutput methods introduced in Java 7.

推荐答案

在这种情况下你不需要管道。

You don't need a pipe in this case.

"grep bla test.txt"

但是假设你需要一个管道，你需要使用像bash这样的shell

however assuming you need a pipe, you need to use a shell like bash

"/bin/bash", "-c", "grep foo text.txt | grep bar"

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