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public static void main(String[] args) throws Exception {
  System.out.println(Thread.currentThread().getContextClassLoader().getResource(""));
  System.out.println(Test.class.getClassLoader().getResource(""));
  System.out.println(ClassLoader.getSystemResource(""));
  System.out.println(Test.class.getResource(""));
  System.out.println(Test.class.getResource("/")); //Class文件所在路径
  System.out.println(new File("/").getAbsolutePath());
  System.out.println(System.getProperty("user.dir"));
}