类加载器工厂

ClassLoaderFactory

内部类Repository

DIR:表示整个目录下的资源，包括所有Class、Jar包及其他类型资源；

GLOB：所有Jar资源；

JAR：单个Jar资源；

URL:从URL上获取的Jar包资源；

URLClassLoader

This class loader is used to load classes and resources from a search

* path of URLs referring to both JAR files and directories. Any URL that

* ends with a '/' is assumed to refer to a directory. Otherwise, the URL

* is assumed to refer to a JAR file which will be opened as needed.

*

* The AccessControlContext of the thread that created the instance of

* URLClassLoader will be used when subsequently loading classes and

* resources.

*

* The classes that are loaded are by default granted permission only to

* access the URLs specified when the URLClassLoader was created