如何检查路径中是否存在程序 [英] How to check existence of a program in the path

问题描述

我正在用scala编写一个程序，调用：

I'm writing a program in scala which call:

Runtime.getRuntime().exec( "svn ..." )

我想检查命令行中是否有svn（即它是可在PATH中到达）。
我该怎么做？

I want to check if "svn" is available from the commandline (ie. it is reachable in the PATH). How can I do this ?

PS：我的程序设计在windows上运行

PS: My program is designed to be run on windows

推荐答案

我不是scala程序员，但我会用任何语言做的，就是执行' svn help '这样的事情检查exec方法的返回码（0或1）...如果失败则svn不在路径中：P

I'm no scala programmer, but what I would do in any language, is to execute something like 'svn help' just to check the return code (0 or 1) of the exec method... if it fails the svn is not in the path :P

Runtime rt = Runtime.getRuntime();
Process proc = rt.exec("svn help");
int exitVal = proc.exitValue();

按照惯例，值0表示正常终止。

By convention, the value 0 indicates normal termination.

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