009 parameter Mapping---base type and wrapper type, array

Source: Internet
Author: User
Tags wrapper

One. Overview

In a web framework, the most important thing we need is to complete the mapping of parameters (data binding).

There are many data types that are supported in Springmvc, and in the following ways we will talk about almost all the possible scenarios.

Two. Basic type and package type

In the process of use, the biggest difference between the basic type and the wrapper type is the processing of NULL.

Speaking of which, we know the difference between the basic type and the type of packaging.

Three. Parameter correction

When we pass parameters that are inconsistent with the parameters in the background, we can use @requestparam () to correct

The name of the parameter, in addition we can specify whether the parameter must be passed, and also give a default value.

Four. Array type

Most of us use array types to use string arrays.

So how do we pass the parameters?

Very simply, we can do it directly by giving the key with the same name.

009 parameter Mapping---base type and wrapper type, array

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.