getResource和getResourceAsStream读取类资源

Java里读取资源文件时，经常用到的两个方法，但是经常会用错的方法
方法说明如下

引用

public URL getResource(String name)

Finds the resource with the given name. A resource is some data (images, audio, text, etc) that can be accessed by class code in a way that is independent of the location of the code.

The name of a resource is a '/'-separated path name that identifies the resource.
这句明确说明，name参数是以‘/’来作为路径分隔符，不是File.separator，如果使用了File.separator，正确的路径也返回null

This method will first search the parent class loader for the resource; if the parent is null the path of the class loader built-in to the virtual machine is searched. That failing, this method will invoke findResource(String) to find the resource.

Parameters:
    name - The resource name
Returns:
    A URL object for reading the resource, or null if the resource could not be found or the invoker doesn't have adequate privileges to get the resource.
Since: