Java无法执行系统命令（Ubuntu） [英] Java cannot execute system command (Ubuntu)

问题描述

这不是我第一次尝试从Java执行系统命令;但这一次结果证明是非常困难的。我有一个脚本，从终端执行得很好。它从文件（input.txt）读取输入，它处理它并将结果导出到另一个文件（ouput.txt）。整件事不超过1秒。但是，当我尝试从Java执行它时，它会卡住并且永远不会完成。这是我的代码：

It's not the first time I have tried to execute a system command from Java; but this time it turns out to be very hard. I have a script that executes just fine from the terminal. It reads input from a file (input.txt), it processes it and exports the result in another file (ouput.txt). The whole thing lasts no more than 1sec. But, when I try to execute it from Java, it gets stuck and never finishes. This is my code:

Process p = new ProcessBuilder("./runCalculator.sh").start();
p.waitFor();

我也试过 Runtime.getRuntime（）。exec（。 /runCalculator.sh）但都是一样的。我已经读过进程的InputStream和ErrorStream。错误流只返回开始计算...之类的消息。

I have also tried with Runtime.getRuntime().exec("./runCalculator.sh") but all the same. I've read both the InputStream and the ErrorStream of the process. The error stream returns nothing but a message like "Starting Calculation..."

任何想法？

推荐答案

您需要使用以下代码：

ProcessBuilder pb = new ProcessBuilder();
pb.command("bash", "-c", "./runCalculator.sh");
Process process = pb.start();
int retValue = process.waitFor();

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