如何在Java中捕获shell命令的退出状态？ [英] How to capture the exit status of a shell command in Java?

问题描述

我正在为我的CSVreader创建一个Junit测试文件。我正在读取CSV文件的内容并将内容写入另一个文件。我想使用diff实用程序比较它们，我想使用diff的退出状态来知道内容是否相同。一般是$？给出退出状态，但我不知道如何捕获它并在我的代码中使用它。在这方面有谁可以帮助我？

I'm creating a Junit test file for my CSVreader. I'm reading the contents of CSV files and writing the contents into another file. I want to compare them using diff utility and I want to use the exit status of diff to know whether the contents are same or not. Generally $? gives the exit status but I don't know how to capture it and use it in my code. Can anyone help me in this regard?

这是我的代码看起来的样子

This is how my code looks

 boolean hasSameContents = false;

    command="diff "+mp.get("directory")+"/"+fileName+" "+mp.get("outdir")+"/"+fileName;
    p= Runtime.getRuntime().exec(command);
    p.waitFor();

在此之后我想获得退出状态并在if这样的条件下使用它

After this I want to get the exit status and use it in a if condition like this

 if(exit_status==0)
     hasSameContents = true;
  else
     hasSameContents = false;

即使是其他建议也值得赞赏。 ：）

Even alternative suggestions appreciated. :)

推荐答案

您正在寻找 Process＃exitValue

String command = "diff "+mp.get("directory")+"/"+fileName+" "+mp.get("outdir")+"/"+fileName;
Process p = Runtime.getRuntime().exec(command);
p.waitFor();
int exitStatus = p.exitValue();

不要忘了，你应该阅读 InputStream的内容即使你不在乎，有些进程会在读取输出缓冲区之前阻塞（不完成）...

Don't forget, you should read the contents of the InputStream even if you don't care, some processes will choke (not finish) until the output buffer has been read...

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