程序包 cn.taketoday.web.view

接口 View

所有已知子接口:
SmartView
所有已知实现类:
AbstractAtomFeedView, AbstractFeedView, AbstractJackson2View, AbstractPdfStamperView, AbstractPdfView, AbstractRssFeedView, AbstractTemplateView, AbstractUrlBasedView, AbstractView, AbstractXlsView, AbstractXlsxStreamingView, AbstractXlsxView, FreeMarkerView, GroovyMarkupView, InternalResourceView, JstlView, MappingJackson2JsonView, MappingJackson2XmlView, MarshallingView, RedirectView, ScriptTemplateView, XsltView
public interface View
View for a web interaction. Implementations are responsible for rendering content, and exposing the model. A single view exposes multiple model attributes.

This class and the MVC approach associated with it is discussed in Chapter 12 of Expert One-On-One J2EE Design and Development by Rod Johnson (Wrox, 2002).

View implementations may differ widely. An obvious implementation would be JSP-based. Other implementations might be XSLT-based, or use an HTML generation library. This interface is designed to avoid restricting the range of possible implementations.

Views should be beans. They are likely to be instantiated as beans by a ViewResolver. As this interface is stateless, view implementations should be thread-safe.

从以下版本开始:
4.0 2022/1/29 11:07
作者:
Rod Johnson, Arjen Poutsma, Rossen Stoyanchev, Harry Yang
另请参阅:

  • 字段详细资料

    • RESPONSE_STATUS_ATTRIBUTE

      static final String RESPONSE_STATUS_ATTRIBUTE
      Name of the RequestContext attribute that contains the response status code.

      Note: This attribute is not required to be supported by all View implementations.

    • SELECTED_CONTENT_TYPE

      static final String SELECTED_CONTENT_TYPE
      The MediaType selected during content negotiation, which may be more specific than the one the View is configured with. For example: "application/vnd.example-v1+xml" vs "application/*+xml".

  • 方法详细资料

    • getContentType

      @Nullable default String getContentType()
      Return the content type of the view, if predetermined.

      Can be used to check the view's content type upfront, i.e. before an actual rendering attempt.

      返回:
      the content type String (optionally including a character set), or null if not predetermined

    • render

      void render(@Nullable Map<String,?> model, RequestContext context) throws Exception
      Render the view given the specified model.

      The first step will be preparing the request: In the JSP case, this would mean setting model objects as request attributes. The second step will be the actual rendering of the view, for example including the JSP via a RequestDispatcher.

      参数:
      model - a Map with name Strings as keys and corresponding model objects as values (Map can also be null in case of empty model)
      context - current HTTP request and response context
      抛出:
      Exception - if rendering failed