Class类的getResource(String name)方法和ClassLoader的getResource(String name)方法

Posted 2020-10-17 小蘇

1、Class.getResource(String name)

package path;

import org.junit.Test;

import jodd.emial.JoddDemo;

public class PathTest {

    @Test
    public void pathTest() {
        System.out.println(JoddDemo.class.getResource(""));//输出file:/E:/workspace/MyDemo/target/classes/jodd/emial/
        System.out.println(JoddDemo.class.getResource("/"));//输出file:/E:/workspace/MyDemo/target/test-classes/
    }
}

由上面程序输出结果可以知道，不加“/”的参数获取的是JoddDemo类所在的包的路径，加“/”的参数获取到的是classpath根目录的路径

package path;

import org.junit.Test;

import jodd.emial.JoddDemo;

public class PathTest {

    @Test
    public void pathTest(){
        System.out.println(JoddDemo.class.getResource(""));
        System.out.println(JoddDemo.class.getResource("/"));
        
        System.out.println(JoddDemo.class.getClassLoader().getResource(""));
        System.out.println(JoddDemo.class.getClassLoader().getResource("/"));
        
        System.out.println(JoddDemo.class.getResource("/image/dongman1.jpg"));
        System.out.println(JoddDemo.class.getClassLoader().getResource("/image/dongman1.jpg"));
    }
}

输出结果依次为：

file:/E:/workspace/MyDemo/target/classes/jodd/emial/
file:/E:/workspace/MyDemo/target/test-classes/
file:/E:/workspace/MyDemo/target/test-classes/
null
file:/E:/workspace/MyDemo/target/classes/image/dongman1.jpg
null