从一个类里面找到一个jar的路径？ [英] Finding the path to a jar from a Class inside it?

问题描述

插件x.y.z应该运行在Java项目之上，并生成一些Java代码。该代码将需要在构建和运行时在Plugin的jar中提供类。因此，插件的jar（或安装目录）应该出现在构建类路径中。

Plugin x.y.z is supposed to run on top of a Java project and generate some Java-Code. This code will need classes available in the Plugin's jar at build and run time. Hence, the Plugin's jar (or installation directory) should appear in the build classpath.

插件如何找到自己的jar /安装目录的确切路径，或对于这个问题，可以通过便携式的方法来连接一些相关的插件的jar的路径？

How can a plugin find out the exact path of it's own jar/installation directory, or, for that matter, the path to the jar of some associated plugin in a portable way?

我想制作一个向导，用户可以运行该向导来启用xyz自然在一个项目。应向用户提供有意义的默认位置，以查找所需的运行时功能，并将给定的库添加到构建路径。

Background is I want to make a wizard that the user can run to enable x.y.z. nature on a project. The user should be provided with a meaningful default for where to find the required runtime functionality, and the given library will be added to the build path.

推荐答案

我们使用它来查找类的位置：

We use this to find the location of a class:

public static URL getLocation(final Class cls) {
  final ProtectionDomain pd = cls.getProtectionDomain();
  final CodeSource cs = pd.getCodeSource();
  return cs.getLocation();
}

不知道它来自哪里。

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