问题描述
我有这个java应用程序并遇到了解析STDF的要求。
I have this java application and ran into a requirement to parse an STDF.
实际上我只需要获取stdf的FAR，MIR和MRR部分文件。在sourceforge上存在一个stdf4j，但由于缺少文档，我不能使用它。
Actually all I needed is to get the FAR,MIR and MRR sections of an stdf file. There exists a stdf4j on sourceforge but I can't use it that much due to lack of documentation.
决心使用用python编写的stdfparser并且是相对更直接，更容易完成工作，实际上我已经修改过以满足我的需求。
The resolve was to use the stdfparser which is written in python and is relatively more straightforward and gets the job done easier, which in fact I have already modified to suit my needs.
所以现在我只需要详细调用这个脚本并阅读用Java生成文件并继续使用现有的应用程序。
So now I just need to invoke this script verbosely and read the resulting file in Java and move on with the exisiting application.
使用时出现问题：
Process p = r.exec("cmd /c python parser.py sample_data.std.gz -v test.txt");
生成的文本文件始终为空。 （请注意，我已经在实际的命令行上运行了这个并成功检索了我需要的内容。）
the resulting text file is always blank. (Note that I already ran this on the actual command line and successfully retrieved the contents I needed.)
有什么我错过了，或者有没有更好的备择方案。 （我正在努力避免使用jython，因为我无法在生产环境中安装它。）
Is there anything I'm missing out, or are there any better alternatives. (I'm trying to avoid jython as I cannot install it's jar on the production environment.)
推荐答案
你应该打电话给 p.waitFor（）; 以便您的Java程序在外部进程执行完之后才会继续运行。
You should perhaps call p.waitFor(); so that your Java program doesn't move on until after the external process has finished executing.
Update 1：还要确保你正在读取 p.getErrorStream（）和 p.getInputStream（）。如果不这样做可能会导致此过程停止。
Update 1: Also make sure you are reading all the bytes out of p.getErrorStream() and p.getInputStream(). Failure to do so may hang the process.
更新2：您可能还需要检查错误代码的进程返回代码。进程返回代码通过 waitFor（）的返回值访问。
Update 2: You may also want to check the process return code for an error code. The process return code is accessed via waitFor()'s return value.
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