org.springframework.web.servlet.mvc.support

Interface RedirectAttributes

All Superinterfaces:

Model

All Known Implementing Classes:

RedirectAttributesModelMap

public interface RedirectAttributes
extends Model

A specialization of the Model interface that controllers can use to select attributes for a redirect scenario. Since the intent of adding redirect attributes is very explicit -- i.e. to be used for a redirect URL, attribute values may be formatted as Strings and stored that way to make them eligible to be appended to the query string or expanded as URI variables in org.springframework.web.servlet.view.RedirectView.

This interface also provides a way to add flash attributes. For a general overview of flash attributes see FlashMap. You can use RedirectAttributes to store flash attributes and they will be automatically propagated to the "output" FlashMap of the current request.

Example usage in an @Controller:

 @RequestMapping(value = "/accounts", method = RequestMethod.POST)
 public String handle(Account account, BindingResult result, RedirectAttributes redirectAttrs) {
   if (result.hasErrors()) {
     return "accounts/new";
   }
   // Save account ...
   redirectAttrs.addAttribute("id", account.getId()).addFlashAttribute("message", "Account created!");
   return "redirect:/accounts/{id}";
 }
 

A RedirectAttributes model is empty when the method is called and is never used unless the method returns a redirect view name or a RedirectView.

After the redirect, flash attributes are automatically added to the model of the controller that serves the target URL.

Since:

3.1

Author:

Rossen Stoyanchev

Method Summary

Modifier and Type	Method and Description
RedirectAttributes	addAllAttributes(java.util.Collection<?> attributeValues) Copy all attributes in the supplied Collection into this Map, using attribute name generation for each element.
RedirectAttributes	addAttribute(java.lang.Object attributeValue) Add the supplied attribute to this Map using a generated name.
RedirectAttributes	addAttribute(java.lang.String attributeName, java.lang.Object attributeValue) Add the supplied attribute under the supplied name.
RedirectAttributes	addFlashAttribute(java.lang.Object attributeValue) Add the given flash storage using a generated name.
RedirectAttributes	addFlashAttribute(java.lang.String attributeName, java.lang.Object attributeValue) Add the given flash attribute.
java.util.Map<java.lang.String,?>	getFlashAttributes() Return the attributes candidate for flash storage or an empty Map.
RedirectAttributes	mergeAttributes(java.util.Map<java.lang.String,?> attributes) Copy all attributes in the supplied Map into this Map, with existing objects of the same name taking precedence (i.e.

Methods inherited from interface org.springframework.ui.Model

addAllAttributes, asMap, containsAttribute

Method Detail

addAttribute

RedirectAttributes addAttribute(java.lang.String attributeName,
                                java.lang.Object attributeValue)

Description copied from interface: Model

Add the supplied attribute under the supplied name.

Specified by:

addAttribute in interface Model

Parameters:

attributeName - the name of the model attribute (never null)

attributeValue - the model attribute value (can be null)

addAttribute

RedirectAttributes addAttribute(java.lang.Object attributeValue)

Description copied from interface: Model

Add the supplied attribute to this Map using a generated name.

Note: Empty Collections are not added to the model when using this method because we cannot correctly determine the true convention name. View code should check for null rather than for empty collections as is already done by JSTL tags.

Specified by:

addAttribute in interface Model

Parameters:

attributeValue - the model attribute value (never null)

addAllAttributes

RedirectAttributes addAllAttributes(java.util.Collection<?> attributeValues)

Description copied from interface: Model

Copy all attributes in the supplied Collection into this Map, using attribute name generation for each element.

Specified by:

addAllAttributes in interface Model

See Also:

Model.addAttribute(Object)

mergeAttributes

RedirectAttributes mergeAttributes(java.util.Map<java.lang.String,?> attributes)

Description copied from interface: Model

Copy all attributes in the supplied Map into this Map, with existing objects of the same name taking precedence (i.e. not getting replaced).

Specified by:

mergeAttributes in interface Model

addFlashAttribute

RedirectAttributes addFlashAttribute(java.lang.String attributeName,
                                     java.lang.Object attributeValue)

Add the given flash attribute.

Parameters:

attributeName - the attribute name; never null

attributeValue - the attribute value; may be null

addFlashAttribute

RedirectAttributes addFlashAttribute(java.lang.Object attributeValue)

Add the given flash storage using a generated name.

Parameters:

attributeValue - the flash attribute value; never null

getFlashAttributes

java.util.Map<java.lang.String,?> getFlashAttributes()

Return the attributes candidate for flash storage or an empty Map.