java web开发中获取tomcat上properties文件内容的方法

String dir = System.getProperty("user.dir"); //获得tomcat所在的工作路径 
    System.out.println(dir);
    
    //获取到存储了文件存储位置的filedir.properties 文件路径
    String dir2 = dir.substring(0, dir.length()-4) + File.separator +"webapps" + File.separator + "NGBOSSmonitor" +File.separator + "WEB-INF"
           + File.separator + "classes" + File.separator + "META-INF" + File.separator + "config" + File.separator + "filedir.properties";

/**
   * 获取filePath路径【properities文件】中key对应的值，
   * @param filePath properities文件路径【包含properities文件】
   * @param key 要查找的key值
   * @return key对应的value
   */
   public String GetValueByKey(String filePath, String key) {
         Properties pps = new Properties();
         try {
           InputStream in = new BufferedInputStream (new FileInputStream(filePath)); 
           pps.load(in);
           String value = pps.getProperty(key);
           //System.out.println(key + " = " + value);
           in.close();
           return value;
           
         }catch (IOException e) {
           e.printStackTrace();
           return null;
         }
       }