InputStream in = PropertiesUtils.class.getClassLoader().getResourceAsStream(fileName);		prop.load(in);		prop.setProperty(propertyName, propertyVlaue);		String url = PropertiesUtils.class.getClassLoader().getResource(fileName).toString().substring(6);		File file = new File(url);

substring(6)的作用是去掉取得路径的/file: