code: public Boolean getParaToBoolean(String name, Boolean defaultValue) {
  		return toBoolean(request.getParameter(name), defaultValue);
  	}
docs: Returns the value of a request parameter and convert to Boolean with a default value if it is null.
  @param name a String specifying the name of the parameter
  @return true if the value of the parameter is "true" or "1", false if it is "false" or "0", default value if it is null