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

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