java 路徑尋址Class.getResource和ClassLoader.getResource

如下內容參考、學習自下面兩篇博客

關於Class.getResource和ClassLoader.getResource的路徑問題

Class.getResource和ClassLoader.getResource的區別分析

Class.getResource(String path)

path不以'/'開頭時，默認是從此類（當前類）所在的包下取資源；path以'/'開頭時，則是從項目的ClassPath根下獲取資源。在這裏'/'表示ClassPath

Class.getClassLoader().getResource(String path)

path不能以'/'開頭， path不以'/'開頭時從ClassPath根下獲取資源。

例子：

代碼：

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"));
    }

}

結果：

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

 

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