RequestBody (Spring Framework 4.3.30.RELEASE API)

```
@Target(PARAMETER)
@Retention(RUNTIME)
@Documented
public @interface RequestBody
```
Annotation indicating a method parameter should be bound to the body of the web request. The body of the request is passed through an HttpMessageConverter to resolve the method argument depending on the content type of the request. Optionally, automatic validation can be applied by annotating the argument with @Valid.
Supported for annotated handler methods in Servlet environments.
从以下版本开始:
3.0
作者:
Arjen Poutsma
另请参阅:
RequestHeader, ResponseBody, RequestMappingHandlerAdapter

- 可选元素概要
  可选元素
  修饰符和类型可选元素说明
  boolean required
  Whether body content is required.

- 元素详细资料
  - required
```
boolean required
```
    Whether body content is required.
    Default is true, leading to an exception thrown in case there is no body content. Switch this to false if you prefer null to be passed when the body content is null.
    从以下版本开始:
    3.2
    默认值:
    true