idea中tomcat下读取资源文件的路径，资源文件放在web下面

        Properties properties = new Properties();
        try {
//            System.out.println("开始try...");
            InputStream is = this.getServletContext().getResourceAsStream("/db.properties");
            properties.load(is);
//            System.out.println("读取文件位置没有报错..");
        } catch (Exception e) {
//            e.printStackTrace();
            System.out.println("有问题..");
        } finally {
            System.out.println("finally...");
        }

        System.out.println(properties);
        String driveClassName = properties.getProperty("driveClassName");
        String url = properties.getProperty("url");
        System.out.println(driveClassName);
        System.out.println(url);