Class ContentNegotiatingViewResolver

All Implemented Interfaces:
Aware, InitializingBean, ApplicationContextAware, Ordered, ServletContextAware, ViewResolver

public class ContentNegotiatingViewResolver extends WebApplicationObjectSupport implements ViewResolver, Ordered, InitializingBean
Implementation of ViewResolver that resolves a view based on the request file name or Accept header.

The ContentNegotiatingViewResolver does not resolve views itself, but delegates to other ViewResolvers. By default, these other view resolvers are picked up automatically from the application context, though they can also be set explicitly by using the viewResolvers property. Note that in order for this view resolver to work properly, the order property needs to be set to a higher precedence than the others (the default is Ordered.HIGHEST_PRECEDENCE).

This view resolver uses the requested media type to select a suitable View for a request. The requested media type is determined through the configured ContentNegotiationManager. Once the requested media type has been determined, this resolver queries each delegate view resolver for a View and determines if the requested media type is compatible with the view's content type). The most compatible view is returned.

Additionally, this view resolver exposes the defaultViews property, allowing you to override the views provided by the view resolvers. Note that these default views are offered as candidates, and still need have the content type requested (via file extension, parameter, or Accept header, described above).

For example, if the request path is /view.html, this view resolver will look for a view that has the text/html content type (based on the html file extension). A request for /view with a text/html request Accept header has the same result.

Arjen Poutsma, Juergen Hoeller, Rossen Stoyanchev
See Also:
  • Constructor Details

    • ContentNegotiatingViewResolver

      public ContentNegotiatingViewResolver()
  • Method Details

    • setContentNegotiationManager

      public void setContentNegotiationManager(@Nullable ContentNegotiationManager contentNegotiationManager)
      Set the ContentNegotiationManager to use to determine requested media types.

      If not set, ContentNegotiationManager's default constructor will be used, applying a HeaderContentNegotiationStrategy.

      See Also:
    • getContentNegotiationManager

      @Nullable public ContentNegotiationManager getContentNegotiationManager()
      Return the ContentNegotiationManager to use to determine requested media types.
    • setUseNotAcceptableStatusCode

      public void setUseNotAcceptableStatusCode(boolean useNotAcceptableStatusCode)
      Indicate whether a 406 Not Acceptable status code should be returned if no suitable view can be found.

      Default is false, meaning that this view resolver returns null for resolveViewName(String, Locale) when an acceptable view cannot be found. This will allow for view resolvers chaining. When this property is set to true, resolveViewName(String, Locale) will respond with a view that sets the response status to 406 Not Acceptable instead.

    • isUseNotAcceptableStatusCode

      public boolean isUseNotAcceptableStatusCode()
      Whether to return HTTP Status 406 if no suitable is found.
    • setDefaultViews

      public void setDefaultViews(List<View> defaultViews)
      Set the default views to use when a more specific view can not be obtained from the ViewResolver chain.
    • getDefaultViews

      public List<View> getDefaultViews()
    • setViewResolvers

      public void setViewResolvers(List<ViewResolver> viewResolvers)
      Sets the view resolvers to be wrapped by this view resolver.

      If this property is not set, view resolvers will be detected automatically.

    • getViewResolvers

      public List<ViewResolver> getViewResolvers()
    • setOrder

      public void setOrder(int order)
    • getOrder

      public int getOrder()
      Description copied from interface: Ordered
      Get the order value of this object.

      Higher values are interpreted as lower priority. As a consequence, the object with the lowest value has the highest priority (somewhat analogous to Servlet load-on-startup values).

      Same order values will result in arbitrary sort positions for the affected objects.

      Specified by:
      getOrder in interface Ordered
      the order value
      See Also:
    • initServletContext

      protected void initServletContext(ServletContext servletContext)
      Description copied from class: WebApplicationObjectSupport
      Subclasses may override this for custom initialization based on the ServletContext that this application object runs in.

      The default implementation is empty. Called by WebApplicationObjectSupport.initApplicationContext(org.springframework.context.ApplicationContext) as well as WebApplicationObjectSupport.setServletContext(jakarta.servlet.ServletContext).

      initServletContext in class WebApplicationObjectSupport
      servletContext - the ServletContext that this application object runs in (never null)
    • afterPropertiesSet

      public void afterPropertiesSet()
      Description copied from interface: InitializingBean
      Invoked by the containing BeanFactory after it has set all bean properties and satisfied BeanFactoryAware, ApplicationContextAware etc.

      This method allows the bean instance to perform validation of its overall configuration and final initialization when all bean properties have been set.

      Specified by:
      afterPropertiesSet in interface InitializingBean
    • resolveViewName

      @Nullable public View resolveViewName(String viewName, Locale locale) throws Exception
      Description copied from interface: ViewResolver
      Resolve the given view by name.

      Note: To allow for ViewResolver chaining, a ViewResolver should return null if a view with the given name is not defined in it. However, this is not required: Some ViewResolvers will always attempt to build View objects with the given name, unable to return null (rather throwing an exception when View creation failed).

      Specified by:
      resolveViewName in interface ViewResolver
      viewName - name of the view to resolve
      locale - the Locale in which to resolve the view. ViewResolvers that support internationalization should respect this.
      the View object, or null if not found (optional, to allow for ViewResolver chaining)
      Exception - if the view cannot be resolved (typically in case of problems creating an actual View object)
    • getMediaTypes

      @Nullable protected List<MediaType> getMediaTypes(HttpServletRequest request)
      Determines the list of MediaType for the given HttpServletRequest.
      request - the current servlet request
      the list of media types requested, if any