确定一个类来自哪个 JAR 文件 [英] Determine which JAR file a class is from

问题描述

我现在不在 IDE 面前，只是在查看 API 规范.

I am not in front of an IDE right now, just looking at the API specs.

CodeSource src = MyClass.class.getProtectionDomain().getCodeSource();
if (src != null) {
    URL jar = src.getLocation();
}

我想确定一个类来自哪个 JAR 文件.是这样吗?

I want to determine which JAR file a class is from. Is this the way to do it?

推荐答案

是的.它适用于除引导类加载器加载的类之外的所有类.另一种确定方法是:

Yes. It works for all classes except classes loaded by bootstrap classloader. The other way to determine is:

Class klass = String.class;
URL location = klass.getResource('/' + klass.getName().replace('.', '/') + ".class");

正如notnoop 指出的klass.getResource() 方法返回类文件本身的位置.例如:

As notnoop pointed out klass.getResource() method returns the location of the class file itself. For example:

jar:file:/jdk/jre/lib/rt.jar!/java/lang/String.class
file:/projects/classes/pkg/MyClass$1.class

getProtectionDomain().getCodeSource().getLocation() 方法返回jar文件或CLASSPATH的位置

The getProtectionDomain().getCodeSource().getLocation() method returns the location of the jar file or CLASSPATH

file:/Users/home/java/libs/ejb3-persistence-1.0.2.GA.jar
file:/projects/classes

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