查找从哪里加载java类 [英] Find where java class is loaded from

问题描述

有谁知道如何以编程方式找出java类加载器实际加载类的位置？

Does anyone know how to programmaticly find out where the java classloader actually loads the class from?

我经常在大型项目上工作，其中类路径变得非常长并且手动搜索实际上不是一个选项。我最近有一个问题，其中类加载器加载的版本不正确class，因为它位于两个不同位置的类路径上。

I often work on large projects where the classpath gets very long and manual searching is not really an option. I recently had a problem where the classloader was loading an incorrect version of a class because it was on the classpath in two different places.

那么如何让类加载器告诉我实际的类文件来自磁盘的哪个位置？

So how can I get the classloader to tell me where on disk the actual class file is coming from?

编辑： 如果由于版本不匹配（或其他原因）类加载器实际上无法加载类怎么办？ ，无论如何我们可以在它读取之前找出它试图读取的文件吗？

What about if the classloader actually fails to load the class due to a version mismatch (or something else), is there anyway we could find out what file its trying to read before it reads it?

推荐答案

这是一个例子：

package foo;

public class Test
{
    public static void main(String[] args)
    {
        ClassLoader loader = Test.class.getClassLoader();
        System.out.println(loader.getResource("foo/Test.class"));
    }
}

打印出来：

file:/C:/Users/Jon/Test/foo/Test.class

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