它们都是去取classpath下的资源，但它们在路径上有一些区别：
1、Class.getResourceAsStream如果在没有"/"开头的情况下是去相对于此class文件开始进行查询的，如：如果有一个com.elliot.A.class的类文件，如果用A.class.getResourceAsStream("test.xml"),其是去A.class包下即com/elliot/下去查找test.xml文件的。但如果其以A.class.getResourceAsStream("/test.xml")，就是从classpath的绝对路径去查找test.xml文件的，也就是和包com同级下去查找文件。
2、ClassLoader.getResourceAsStream方式是从classpath的绝对路径开始去查询资源的，其开头不能加"/",其效果和Class.getResourceAsStream以"/"等同。
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