java中获取类资源的方法总结

package com.io.test;

import java.io.InputStream;

public class TestIo {
  public static void main(String[] args) {
    //一、通过ClassLoader方式
    ClassLoader loader = TestIo.class.getClassLoader();//直接从跟路径搜索
    InputStream a1 = loader.getResourceAsStream("a.txt");
    InputStream b1 = loader.getResourceAsStream("test/file/b.txt");
    InputStream c1 = loader.getResourceAsStream("com/io/test/c.txt");
    System.out.println("a1=>"+a1);
    System.out.println("b1=>"+b1);
    System.out.println("c1=>"+c1);
    
    //二、通过Class方式
    Class<TestIo> clazz = TestIo.class;
    InputStream a2 = clazz.getResourceAsStream("/a.txt");//斜杠表示直接从根路径开始搜索
    InputStream a3 = clazz.getResourceAsStream("../../../a.txt");//通过相对路径
    InputStream c2 = clazz.getResourceAsStream("c.txt");//当前类路劲，相对路径
    InputStream c3 = clazz.getResourceAsStream("/com/io/test/c.txt");//从跟路径开始搜索
    System.out.println("a2=>"+a2);
    System.out.println("a3=>"+a3);
    System.out.println("c2=>"+c2);
    System.out.println("c3=>"+c3);
  }
}

a1=>java.io.BufferedInputStream@15db9742
b1=>java.io.BufferedInputStream@6d06d69c
c1=>java.io.BufferedInputStream@7852e922
a2=>java.io.BufferedInputStream@4e25154f
a3=>java.io.BufferedInputStream@70dea4e
c2=>java.io.BufferedInputStream@5c647e05
c3=>java.io.BufferedInputStream@33909752