public class RequestParamMethodArgumentResolver extends AbstractNamedValueMethodArgumentResolver implements UriComponentsContributor
RequestParam, arguments of
type MultipartFile in conjunction with Spring's MultipartResolver
abstraction, and arguments of type javax.servlet.http.Part in conjunction
with Servlet 3.0 multipart requests. This resolver can also be created in default
resolution mode in which simple types (int, long, etc.) not annotated with
@RequestParam are also treated as request parameters with
the parameter name derived from the argument name.
If the method parameter type is Map, the name specified in the
annotation is used to resolve the request parameter String value. The value is
then converted to a Map via type conversion assuming a suitable
Converter or PropertyEditor has been registered.
Or if a request parameter name is not specified the
RequestParamMapMethodArgumentResolver is used instead to provide
access to all request parameters in the form of a map.
A WebDataBinder is invoked to apply type conversion to resolved request
header values that don't yet match the method parameter type.
RequestParamMapMethodArgumentResolverAbstractNamedValueMethodArgumentResolver.NamedValueInfo| Constructor and Description |
|---|
RequestParamMethodArgumentResolver(boolean useDefaultResolution) |
RequestParamMethodArgumentResolver(ConfigurableBeanFactory beanFactory,
boolean useDefaultResolution) |
| Modifier and Type | Method and Description |
|---|---|
void |
contributeMethodArgument(MethodParameter parameter,
Object value,
UriComponentsBuilder builder,
Map<String,Object> uriVariables,
ConversionService conversionService)
Process the given method argument and either update the
UriComponentsBuilder or add to the map with URI variables
to use to expand the URI after all arguments are processed. |
protected AbstractNamedValueMethodArgumentResolver.NamedValueInfo |
createNamedValueInfo(MethodParameter parameter)
Create the
AbstractNamedValueMethodArgumentResolver.NamedValueInfo object for the given method parameter. |
protected String |
formatUriValue(ConversionService cs,
TypeDescriptor sourceType,
Object value) |
protected void |
handleMissingValue(String name,
MethodParameter parameter,
NativeWebRequest request)
Invoked when a named value is required, but
AbstractNamedValueMethodArgumentResolver.resolveName(String, MethodParameter, NativeWebRequest)
returned null and there is no default value. |
protected Object |
resolveName(String name,
MethodParameter parameter,
NativeWebRequest request)
Resolve the given parameter type and value name into an argument value.
|
boolean |
supportsParameter(MethodParameter parameter)
Supports the following:
@RequestParam-annotated method arguments.
|
handleMissingValue, handleResolvedValue, resolveArgumentpublic RequestParamMethodArgumentResolver(boolean useDefaultResolution)
useDefaultResolution - in default resolution mode a method argument
that is a simple type, as defined in BeanUtils.isSimpleProperty(java.lang.Class<?>),
is treated as a request parameter even if it isn't annotated, the
request parameter name is derived from the method parameter name.public RequestParamMethodArgumentResolver(ConfigurableBeanFactory beanFactory, boolean useDefaultResolution)
beanFactory - a bean factory used for resolving ${...} placeholder
and #{...} SpEL expressions in default values, or null if default
values are not expected to contain expressionsuseDefaultResolution - in default resolution mode a method argument
that is a simple type, as defined in BeanUtils.isSimpleProperty(java.lang.Class<?>),
is treated as a request parameter even if it isn't annotated, the
request parameter name is derived from the method parameter name.public boolean supportsParameter(MethodParameter parameter)
Map params where the annotation doesn't
specify a name. See RequestParamMapMethodArgumentResolver
instead for such params.
MultipartFile
unless annotated with @RequestPart.
javax.servlet.http.Part
unless annotated with @RequestPart.
RequestParam.
supportsParameter in interface HandlerMethodArgumentResolversupportsParameter in interface UriComponentsContributorparameter - the method parameter to checktrue if this resolver supports the supplied parameter;
false otherwiseprotected AbstractNamedValueMethodArgumentResolver.NamedValueInfo createNamedValueInfo(MethodParameter parameter)
AbstractNamedValueMethodArgumentResolverAbstractNamedValueMethodArgumentResolver.NamedValueInfo object for the given method parameter. Implementations typically
retrieve the method annotation by means of MethodParameter.getParameterAnnotation(Class).createNamedValueInfo in class AbstractNamedValueMethodArgumentResolverparameter - the method parameterprotected Object resolveName(String name, MethodParameter parameter, NativeWebRequest request) throws Exception
AbstractNamedValueMethodArgumentResolverresolveName in class AbstractNamedValueMethodArgumentResolvername - the name of the value being resolvedparameter - the method parameter to resolve to an argument value
(pre-nested in case of a Optional declaration)request - the current requestnull)Exception - in case of errorsprotected void handleMissingValue(String name, MethodParameter parameter, NativeWebRequest request) throws Exception
AbstractNamedValueMethodArgumentResolverAbstractNamedValueMethodArgumentResolver.resolveName(String, MethodParameter, NativeWebRequest)
returned null and there is no default value. Subclasses typically throw an exception in this case.handleMissingValue in class AbstractNamedValueMethodArgumentResolvername - the name for the valueparameter - the method parameterrequest - the current requestExceptionpublic void contributeMethodArgument(MethodParameter parameter, Object value, UriComponentsBuilder builder, Map<String,Object> uriVariables, ConversionService conversionService)
UriComponentsContributorUriComponentsBuilder or add to the map with URI variables
to use to expand the URI after all arguments are processed.contributeMethodArgument in interface UriComponentsContributorparameter - the controller method parameter (never null)value - the argument value (possibly null)builder - the builder to update (never null)uriVariables - a map to add URI variables to (never null)conversionService - a ConversionService to format values as Stringsprotected String formatUriValue(ConversionService cs, TypeDescriptor sourceType, Object value)