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?
也就是说,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?
That is, if Thread.currentThread().getContextClassLoader()
and getClass().getClassLoader()
return different class loader objects, which one will be used?
推荐答案
每个类将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,或者它的父母.
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()
如果它想加载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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