java.lang.Object
- org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport
- - org.springframework.web.reactive.result.method.annotation.AbstractNamedValueArgumentResolver
  - - org.springframework.web.reactive.result.method.annotation.AbstractNamedValueSyncArgumentResolver
    - - org.springframework.web.reactive.result.method.annotation.RequestParamMethodArgumentResolver

All Implemented Interfaces:
HandlerMethodArgumentResolver, SyncHandlerMethodArgumentResolver
```
public class RequestParamMethodArgumentResolver
extends AbstractNamedValueSyncArgumentResolver
```
Resolver for method arguments annotated with @RequestParam from URI query string parameters.
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 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.
Since:
5.0
Author:
Rossen Stoyanchev
See Also:
RequestParamMapMethodArgumentResolver

Nested Class Summary
- Nested classes/interfaces inherited from class org.springframework.web.reactive.result.method.annotation.AbstractNamedValueArgumentResolver
  AbstractNamedValueArgumentResolver.NamedValueInfo

Field Summary
- Fields inherited from class org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport
  logger

Constructor Summary

Constructors
Constructor	Description
`RequestParamMethodArgumentResolver(ConfigurableBeanFactory factory, ReactiveAdapterRegistry registry, boolean useDefaultResolution)`	Class constructor with a default resolution mode flag.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected AbstractNamedValueArgumentResolver.NamedValueInfo`	`createNamedValueInfo(MethodParameter parameter)`	Create the `AbstractNamedValueArgumentResolver.NamedValueInfo` object for the given method parameter.
`protected void`	`handleMissingValue(String name, MethodParameter parameter, ServerWebExchange exchange)`	Invoked when a named value is required, but `AbstractNamedValueArgumentResolver.resolveName(String, MethodParameter, ServerWebExchange)` returned `null` and there is no default value.
`protected Object`	`resolveNamedValue(String name, MethodParameter parameter, ServerWebExchange exchange)`	Actually resolve the value synchronously.
`boolean`	`supportsParameter(MethodParameter param)`	Whether this resolver supports the given method parameter.

Methods inherited from class org.springframework.web.reactive.result.method.annotation.AbstractNamedValueSyncArgumentResolver
resolveArgument, resolveArgumentValue, resolveName

Methods inherited from class org.springframework.web.reactive.result.method.annotation.AbstractNamedValueArgumentResolver
handleMissingValue, handleResolvedValue

Methods inherited from class org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport
checkAnnotatedParamNoReactiveWrapper, checkParameterType, checkParameterTypeNoReactiveWrapper, getAdapterRegistry

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - RequestParamMethodArgumentResolver
```
public RequestParamMethodArgumentResolver(@Nullable
                                          ConfigurableBeanFactory factory,
                                          ReactiveAdapterRegistry registry,
                                          boolean useDefaultResolution)
```
    Class constructor with a default resolution mode flag.
    Parameters:
    factory - a bean factory used for resolving ${...} placeholder and #{...} SpEL expressions in default values, or null if default values are not expected to contain expressions
    registry - for checking reactive type wrappers
    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.
- Method Detail
  - supportsParameter
```
public boolean supportsParameter(MethodParameter param)
```
    Description copied from interface: HandlerMethodArgumentResolver
    Whether this resolver supports the given method parameter.
    Parameters:
    param - the method parameter
  - createNamedValueInfo
```
protected AbstractNamedValueArgumentResolver.NamedValueInfo createNamedValueInfo(MethodParameter parameter)
```
    Description copied from class: AbstractNamedValueArgumentResolver
    Create the AbstractNamedValueArgumentResolver.NamedValueInfo object for the given method parameter. Implementations typically retrieve the method annotation by means of MethodParameter.getParameterAnnotation(Class).
    Specified by:
    createNamedValueInfo in class AbstractNamedValueArgumentResolver
    Parameters:
    parameter - the method parameter
    Returns:
    the named value information
  - resolveNamedValue
```
protected Object resolveNamedValue(String name,
                                   MethodParameter parameter,
                                   ServerWebExchange exchange)
```
    Description copied from class: AbstractNamedValueSyncArgumentResolver
    Actually resolve the value synchronously.
    Specified by:
    resolveNamedValue in class AbstractNamedValueSyncArgumentResolver
  - handleMissingValue
```
protected void handleMissingValue(String name,
                                  MethodParameter parameter,
                                  ServerWebExchange exchange)
```
    Description copied from class: AbstractNamedValueArgumentResolver
    Invoked when a named value is required, but AbstractNamedValueArgumentResolver.resolveName(String, MethodParameter, ServerWebExchange) returned null and there is no default value. Subclasses typically throw an exception in this case.
    Overrides:
    handleMissingValue in class AbstractNamedValueArgumentResolver
    Parameters:
    name - the name for the value
    parameter - the method parameter
    exchange - the current exchange

Class RequestParamMethodArgumentResolver

Nested Class Summary

Nested classes/interfaces inherited from class org.springframework.web.reactive.result.method.annotation.AbstractNamedValueArgumentResolver

Field Summary

Fields inherited from class org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport

Constructor Summary

Method Summary

Methods inherited from class org.springframework.web.reactive.result.method.annotation.AbstractNamedValueSyncArgumentResolver

Methods inherited from class org.springframework.web.reactive.result.method.annotation.AbstractNamedValueArgumentResolver

Methods inherited from class org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport

Methods inherited from class java.lang.Object

Constructor Detail

RequestParamMethodArgumentResolver

Method Detail

supportsParameter

createNamedValueInfo

resolveNamedValue

handleMissingValue