fileName = "url.properties";
  fileName =
   System.getProperties().getProperty("user.dir")
    + System.getProperties().getProperty("file.separator")
    + fileName;

  Properties login = new Properties();
  //InputStream is = getClass().getResourceAsStream(fileName);
  FileInputStream is = new FileInputStream(fileName);

  if (is == null) {
   throw new RuntimeException("未找到资源:" + fileName);
  }
  login.load(is);
  dbparam = login;
  this.constr = login.getProperty("DBCONN"); 

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