问题描述
在Windows我有一个环境变量EXTERNAL_LIB_ROOT指向C：\\ Program Files文件\\ MyExternalLibRoot。在另一台机器，它可能是C：\\ ExternalLibs
In Windows I have an environment variable EXTERNAL_LIB_ROOT that points to C:\Program Files\MyExternalLibRoot. On another machine, it may point to C:\ExternalLibs.
在一个Ant build.xml文件，我会用：
In an ant build.xml file I would use:
<pathelement location="${env.EXTERNAL_LIB_ROOT}/path/to/jar.jar"/>
我如何建立一个Eclipse项目.classpath文件使用EXTERNAL_LIB_ROOT环境变量？是否有可能使Eclipse自动使用上述环境变量生成build.xml文件？
How do I set up an Eclipse project .classpath file to use the EXTERNAL_LIB_ROOT environment variable? Is it possible to have Eclipse auto generate the build.xml file using the environment variable as above?
推荐答案
不是一个环境变量，但你可以设置<一个href=\"http://help.eclipse.org/indigo/index.jsp?topic=/org.eclipse.platform.doc.user/concepts/cpathvars.htm\"相对=nofollow>在Eclipse路径变量。路径变量是每个工作区。因此，它们是共享工作空间内的多个项目之间的共同位置的方便的方法。我已经使用它们共享项目中一个lib文件夹。
Not an environment variable, but you can set up a Path Variable in Eclipse. Path variables are per-workspace. They are therefore a convenient way of sharing a common location among multiple projects within a workspace. I have used them to share a lib folder among projects.
要创建一个路径变量（无论是第一次，或重复使用在项目现有）：
To create a Path Variable (either for the first time, or to re-use an existing one in a project):
- 文件/新建/文件夹
- 打开新建文件夹对话框
- 打开选择路径变量对话框
在你的情况下，创建一个名为EXTERNAL_LIB_ROOT变量。
In your case, create a variable called EXTERNAL_LIB_ROOT.
（顺便说一句，而不是从你的.classpath产生一个build.xml，我会建议，而不是创建您的build.xml的.classpath和.project）。
(BTW, rather than generating a build.xml from your .classpath, I would suggest instead creating .classpath and .project from your build.xml.)
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