java获取项目绝对路径

    public static void main(String[] args) {
        //获取是项目的绝对路径
        System.out.println(System.getProperty("user.dir"));
        System.out.println(new File("").getAbsolutePath());
        //获取到clsspath绝对路径
        System.out.println(ServerDemo.class.getResource("/"));
        System.out.println(Thread.currentThread().getContextClassLoader().getResource(""));
        System.out.println(ServerDemo.class.getClassLoader().getResource(""));
   
    }