java 路径寻址Class.getResource和ClassLoader.getResource

如下内容参考、学习自下面两篇博客

关于Class.getResource和ClassLoader.getResource的路径问题

Class.getResource和ClassLoader.getResource的区别分析

Class.getResource(String path)

path不以'/'开头时，默认是从此类（当前类）所在的包下取资源；path以'/'开头时，则是从项目的ClassPath根下获取资源。在这里'/'表示ClassPath

Class.getClassLoader().getResource(String path)

path不能以'/'开头， path不以'/'开头时从ClassPath根下获取资源。

例子：

代码：

package com.zjl.Test;

public class test {
    public static void main(String[] args){
        System.out.println(test.class.getResource(""));
        System.out.println(test.class.getResource("/"));
        System.out.println("***************************************************************");
        System.out.println(test.class.getClassLoader().getResource(""));
        System.out.println(test.class.getClassLoader().getResource("/"));
        System.out.println("***************************************************************");
        System.out.println(test.class.getResource("/file1.txt"));
        System.out.println(test.class.getResource("/com/zjl/file2.txt"));
        System.out.println(test.class.getResource("file3.txt"));
        System.out.println("***************************************************************");
        System.out.println(test.class.getClassLoader().getResource("file1.txt"));
        System.out.println(test.class.getClassLoader().getResource("com/zjl/file2.txt"));
        System.out.println(test.class.getClassLoader().getResource("com/zjl/Test/file3.txt"));
    }

}

结果：

file:/C:/Users/Administrator/workspace/TestObject/out/production/TestObject/com/zjl/Test/
file:/C:/Users/Administrator/workspace/TestObject/out/production/TestObject/
***************************************************************
file:/C:/Users/Administrator/workspace/TestObject/out/production/TestObject/
null
***************************************************************
file:/C:/Users/Administrator/workspace/TestObject/out/production/TestObject/file1.txt
file:/C:/Users/Administrator/workspace/TestObject/out/production/TestObject/com/zjl/file2.txt
file:/C:/Users/Administrator/workspace/TestObject/out/production/TestObject/com/zjl/Test/file3.txt
***************************************************************
file:/C:/Users/Administrator/workspace/TestObject/out/production/TestObject/file1.txt
file:/C:/Users/Administrator/workspace/TestObject/out/production/TestObject/com/zjl/file2.txt
file:/C:/Users/Administrator/workspace/TestObject/out/production/TestObject/com/zjl/Test/file3.txt

Process finished with exit code 0

 

回家睡觉~