Package org.springframework.web.servlet.mvc.method.annotation

Class RequestPartMethodArgumentResolver

java.lang.Object

org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver

org.springframework.web.servlet.mvc.method.annotation.RequestPartMethodArgumentResolver

All Implemented Interfaces:

HandlerMethodArgumentResolver

public class RequestPartMethodArgumentResolver
extends AbstractMessageConverterMethodArgumentResolver

Resolves the following method arguments:

• Annotated with @RequestPart
• Of type MultipartFile in conjunction with Spring's MultipartResolver abstraction
• Of type jakarta.servlet.http.Part in conjunction with Servlet multipart requests

When a parameter is annotated with @RequestPart, the content of the part is passed through an HttpMessageConverter to resolve the method argument with the 'Content-Type' of the request part in mind. This is analogous to what @RequestBody does to resolve an argument based on the content of a regular request.

When a parameter is not annotated with @RequestPart or the name of the part is not specified, the request part's name is derived from the name of the method argument.

Automatic validation may be applied if the argument is annotated with any annotations that trigger validation. In case of validation failure, a MethodArgumentNotValidException is raised and a 400 response status code returned if the DefaultHandlerExceptionResolver is configured.

Since:

3.1

Author:

Rossen Stoyanchev, Brian Clozel, Juergen Hoeller

Field Summary

Fields inherited from class org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver

logger, messageConverters

Constructor Summary

Constructors

Constructor	Description
RequestPartMethodArgumentResolver(List<HttpMessageConverter<?>> messageConverters)	Basic constructor with converters only.
RequestPartMethodArgumentResolver(List<HttpMessageConverter<?>> messageConverters, List<Object> requestResponseBodyAdvice)	Constructor with converters and RequestBodyAdvice and ResponseBodyAdvice.

Method Summary

Modifier and Type	Method	Description
Object	resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest request, WebDataBinderFactory binderFactory)	Resolves a method parameter into an argument value from a given request.
boolean	supportsParameter(MethodParameter parameter)	Whether the given method parameter is supported as multipart.

Methods inherited from class org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver

adaptArgumentIfNecessary, createInputMessage, getSupportedMediaTypes, isBindExceptionRequired, readWithMessageConverters, readWithMessageConverters, validateIfApplicable

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

RequestPartMethodArgumentResolver

public RequestPartMethodArgumentResolver(List<HttpMessageConverter<?>> messageConverters)

Basic constructor with converters only.

RequestPartMethodArgumentResolver

public RequestPartMethodArgumentResolver(List<HttpMessageConverter<?>> messageConverters,
 List<Object> requestResponseBodyAdvice)

Constructor with converters and RequestBodyAdvice and ResponseBodyAdvice.

Method Details

supportsParameter

public boolean supportsParameter(MethodParameter parameter)

Whether the given method parameter is supported as multipart. Supports the following method parameters:

• annotated with @RequestPart
• of type MultipartFile unless annotated with @RequestParam
• of type jakarta.servlet.http.Part unless annotated with @RequestParam

Parameters:

parameter - the method parameter to check

Returns:

true if this resolver supports the supplied parameter; false otherwise

resolveArgument

@Nullable
public Object resolveArgument(MethodParameter parameter,
 @Nullable
 ModelAndViewContainer mavContainer,
 NativeWebRequest request,
 @Nullable
 WebDataBinderFactory binderFactory)
                       throws Exception

Description copied from interface: HandlerMethodArgumentResolver

Resolves a method parameter into an argument value from a given request. A ModelAndViewContainer provides access to the model for the request. A WebDataBinderFactory provides a way to create a WebDataBinder instance when needed for data binding and type conversion purposes.

Parameters:

parameter - the method parameter to resolve. This parameter must have previously been passed to HandlerMethodArgumentResolver.supportsParameter(org.springframework.core.MethodParameter) which must have returned true.

mavContainer - the ModelAndViewContainer for the current request

request - the current request

binderFactory - a factory for creating WebDataBinder instances

Returns:

the resolved argument value, or null if not resolvable

Throws:

Exception - in case of errors with the preparation of argument values