Class.getResource(String path)

path不以"/“開頭時，預設是從此類所在的包下取資源；
path 以”/"開頭時，則是從ClasPath根下獲取資源；

public class ResourceTest {

    @Test
    public void testClassGetResource() {
        Class<ResourceTest> clz = ResourceTest.class;
        URL resource = clz.getResource(""); //file:/Users/jianglei/yunhe/spring-example/mybatis-01/target/test-classes/com/resource/
 

        resource = clz.getResource("/");    //file:/Users/jianglei/yunhe/spring-example/mybatis-01/target/test-classes/
    }
}

ClassLoader.getResource(String path)

path不能以"/"開頭;
path是從ClassPath根下獲取

public class ResourceTest {

    @Test
    public void testClassLoaderGetResource() {
        ClassLoader classLoader =
 
 ResourceTest.class.getClassLoader();
        URL resource = classLoader.getResource("");  //  file:/Users/jianglei/yunhe/spring-example/mybatis-01/target/test-classes/
        URL resource1 = classLoader.getResource("/"); // null
    }
}