线程的上下文类加载器和普通类加载器的区别

Difference between thread#39;s context class loader and normal classloader(线程的上下文类加载器和普通类加载器的区别)

问题描述

线程的上下文类加载器和普通的类加载器有什么区别?

What is the difference between a thread's context class loader and a normal class loader?

即如果Thread.currentThread().getContextClassLoader()和getClass().getClassLoader()返回不同的类加载器对象，会使用哪一个呢?

That is, if Thread.currentThread().getContextClassLoader() and getClass().getClassLoader() return different class loader objects, which one will be used?

推荐答案

每个类都会使用自己的类加载器来加载其他类.所以如果 ClassA.class 引用 ClassB.class 那么 ClassB 需要在 ClassA 的类加载器的类路径上，或其父母.

Each class will use its own classloader to load other classes. So if ClassA.class references ClassB.class then ClassB needs to be on the classpath of the classloader of ClassA, or its parents.

线程上下文类加载器是当前线程的当前类加载器.可以从 ClassLoaderC 中的类创建对象，然后将其传递给 ClassLoaderD 拥有的线程.在这种情况下，对象需要直接使用 Thread.currentThread().getContextClassLoader() 如果它想要加载在它自己的类加载器上不可用的资源.

The thread context classloader is the current classloader for the current thread. An object can be created from a class in ClassLoaderC and then passed to a thread owned by ClassLoaderD. In this case the object needs to use Thread.currentThread().getContextClassLoader() directly if it wants to load resources that are not available on its own classloader.

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