org.springframework.web.bind.annotation

Annotation Type RequestParam

@Target(value=PARAMETER)
 @Retention(value=RUNTIME)
 @Documented
public @interface RequestParam

Annotation which indicates that a method parameter should be bound to a web request parameter. Supported for annotated handler methods in Servlet and Portlet environments.

If the method parameter type is Map and a request parameter name is specified, then the request parameter value is converted to a Map assuming an appropriate conversion strategy is available.

If the method parameter is Map<String, String> or MultiValueMap<String, String> and a parameter name is not specified, then the map parameter is populated with all request parameter names and values.

Since:

2.5

Author:

Arjen Poutsma, Juergen Hoeller

See Also:

RequestMapping, RequestHeader, CookieValue, RequestMappingHandlerAdapter, AnnotationMethodHandlerAdapter, AnnotationMethodHandlerAdapter

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
String	defaultValue The default value to use as a fallback when the request parameter value is not provided or empty.
boolean	required Whether the parameter is required.
String	value The name of the request parameter to bind to.

Element Detail

value

public abstract String value

The name of the request parameter to bind to.

Default:

""

required

public abstract boolean required

Whether the parameter is required.

Default is true, leading to an exception thrown in case of the parameter missing in the request. Switch this to false if you prefer a null in case of the parameter missing.

Alternatively, provide a defaultValue, which implicitly sets this flag to false.

Default:

true

defaultValue

public abstract String defaultValue

The default value to use as a fallback when the request parameter value is not provided or empty. Supplying a default value implicitly sets required() to false.

Default:

"\n\t\t\n\t\t\n\ue000\ue001\ue002\n\t\t\t\t\n"