idea启动与jar包启动中使用resource资源文件路径的问题

ClassLoader classLoader = this.class.getClassLoader();   
URL appUrl = classLoader.getResource("center/AppStarter.java"); 
File appJava = new File(appUrl.getFile());

//2.创建输入流
String path = "META-INF/item.xml"
InputStream is = this.getClass().getClassLoader().getResourceAsStream(path);

      ClassPathResource resource = new ClassPathResource("/map/map.properties");
        InputStream inputStream = resource.getInputStream();
        System.out.println("inputStream.available() = " + inputStream.available());
        System.out.println("resource.getFile().getAbsolutePath() = " +    	resource.getFile().getAbsolutePath());

 ClassPathResource classPathResource = new ClassPathResource("/map/map.properties");
        InputStream cis = classPathResource.getInputStream();
        //获取classpath下第一个/map/map.properties，这个根据jar包的加载先后顺序有关
        InputStream ris = ClassPathResource.class.getClassLoader().getResourceAsStream("/map/map.properties");
        //这个是获取classpath下所有的map/map.properties，在jvm运行时，所有jar都相当于是一个classpath
        Enumeration<URL> resources = ClassPathResource.class.getClassLoader().getResources("/map/map.properties");