code: public static String keyParam(String component_appid, String authorizer_appid) {
  		return String.format("%s%s%s", component_appid, KEY_JOIN, authorizer_appid);
  	}
docs: keys 组合
  
  @param component_appid
  component_appid
  @param authorizer_appid
  authorizer_appid
  @return keyParam