Package jakarta.ws.rs

Annotation Type FormParam

@Target({PARAMETER,METHOD,FIELD})
@Retention(RUNTIME)
@Documented
public @interface FormParam
Binds the value(s) of a form parameter contained within a request entity body to a resource method parameter. Values are URL decoded unless this is disabled using the Encoded annotation. A default value can be specified using the DefaultValue annotation. If the request entity body is absent or is an unsupported media type, the default value is used. The type T of the annotated parameter must either:
  1. Be a primitive type
  2. Have a constructor that accepts a single String argument
  3. Have a static method named valueOf or fromString that accepts a single String argument (see, for example, Integer.valueOf(String))
  4. Have a registered implementation of ParamConverterProvider JAX-RS extension SPI that returns a ParamConverter instance capable of a "from string" conversion for the type.
  5. Be List<T>, Set<T> or SortedSet<T>, where T satisfies 2, 3 or 4 above. The resulting collection is read-only.

If the type is not one of the collection types listed in 5 above and the form parameter is represented by multiple values then the first value (lexically) of the parameter is used.

If this annotation is used to bind form parameters, a JAX-RS implementation MUST use the entity provider API to create a Form and derive the values from this instance. If there is at least one FormParam for a resource method, JAX-RS implementations MUST support a Form entity parameter for the same method. Support for other entity parameter types is OPTIONAL.

Note that, whilst the annotation target permits use on fields and methods, this annotation is only required to be supported on resource method parameters.

Since:
1.0
Author:
Paul Sandoz, Marc Hadley
See Also:
DefaultValue, Encoded

  • Required Element Summary

    Required Elements 
    Modifier and Type Required Element Description
    String value
    Defines the name of the form parameter whose value will be used to initialize the value of the annotated method argument.

  • Element Details

    • value

      String value
      Defines the name of the form parameter whose value will be used to initialize the value of the annotated method argument. The name is specified in decoded form, any percent encoded literals within the value will not be decoded and will instead be treated as literal text. E.g. if the parameter name is "a b" then the value of the annotation is "a b", not "a+b" or "a%20b".
      Returns:
      form parameter name.