Java加载资源Class.class.getResource与< classname> .class.getResource [英] Java loading resources Class.class.getResource vs <classname>.class.getResource

问题描述

两者之间有什么区别？

What is the difference between the two ?

我的资源文件打包在根级别包中。在我测试的特定情况下，调用Class.class.getResource（ / rec.txt）似乎可以正常工作。但是，当我尝试使用此jar作为较大环境中的依赖项（hadoop）时，此方法不起作用（返回null）。但是，将类更改为代码中的任何特定类都可以修复该问题。有人可以给我一些光。

my resource files are packaged in the root level package. And calling Class.class.getResource("/rec.txt") seemed to work in the specific case I tested. But, when I tried to use this jar as a dependency in a larger environment ( hadoop ) this didnt work ( returned null ). But, changing "Class" to any specific class in the code fixed it. Could someone throw some light.

推荐答案

发生这种情况的原因是getResource的工作方式。本质上，它将调用委托给< classname> 的classLoader。

The reason this is happening is that the way getResource works. It essentially delegates the call to the classLoader of the <classname> as put it in your question.

类对象可能是由企业应用程序中的引导类加载器加载的，而您的类< classname> 是由其他类加载器加载的。

The Class object was probably loaded by the bootstrap classloader in an enterprise application whereas your class <classname> was loaded by a different classloader.

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