org.springframework.web.servlet.view
Class InternalResourceView

java.lang.Object
  org.springframework.context.support.ApplicationObjectSupport
      org.springframework.web.context.support.WebApplicationObjectSupport
          org.springframework.web.servlet.view.AbstractView
              org.springframework.web.servlet.view.AbstractUrlBasedView
                  org.springframework.web.servlet.view.InternalResourceView

All Implemented Interfaces:

BeanNameAware, InitializingBean, ApplicationContextAware, View

Direct Known Subclasses:

JstlView, TilesView

public class InternalResourceView
extends AbstractUrlBasedView

Wrapper for a JSP or other resource within the same web application. Exposes model objects as request attributes and forwards the request to the specified resource URL using a RequestDispatcher.

A URL for this view is supposed to specify a resource within the web application, suitable for RequestDispatcher's forward or include method.

If operating within an already included request or within a response that has already been committed, this view will fall back to an include instead of a forward. This can be enforced by calling response.flushBuffer() (which will commit the response) before rendering the view.

Typical usage with InternalResourceViewResolver would look as follows, from the perspective of the DispatcherServlet context definition:

 <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
   <property name="prefix" value="/WEB-INF/jsp/"/>
   <property name="suffix" value=".jsp"/>
 </bean>

Every view name returned from a handler will be translated to a JSP resource (for example: "myView" -> "/WEB-INF/jsp/myView.jsp"), using this view class by default.

Author:

Rod Johnson, Juergen Hoeller

See Also:

RequestDispatcher.forward(javax.servlet.ServletRequest, javax.servlet.ServletResponse), RequestDispatcher.include(javax.servlet.ServletRequest, javax.servlet.ServletResponse), ServletResponse.flushBuffer(), InternalResourceViewResolver

Field Summary

Fields inherited from class org.springframework.web.servlet.view.AbstractView

DEFAULT_CONTENT_TYPE

Fields inherited from class org.springframework.context.support.ApplicationObjectSupport

logger

Constructor Summary

InternalResourceView()
Constructor for use as a bean.

InternalResourceView(String url)
Create a new InternalResourceView with the given URL.

Method Summary

protected void	exposeHelpers(HttpServletRequest request) Expose helpers unique to each rendering operation.
protected void	exposeModelAsRequestAttributes(Map model, HttpServletRequest request) Expose the model objects in the given map as request attributes.
protected String	prepareForRendering(HttpServletRequest request, HttpServletResponse response) Prepare for rendering, and determine the request dispatcher path to forward to (or to include).
protected void	renderMergedOutputModel(Map model, HttpServletRequest request, HttpServletResponse response) Render the internal resource given the specified model.
protected boolean	useInclude(HttpServletRequest request, HttpServletResponse response) Determine whether to use RequestDispatcher's include or forward method.

Methods inherited from class org.springframework.web.servlet.view.AbstractUrlBasedView

afterPropertiesSet, getUrl, setUrl, toString

Methods inherited from class org.springframework.web.servlet.view.AbstractView

addStaticAttribute, createRequestContext, getAttributesMap, getBeanName, getContentType, getRequestContextAttribute, getStaticAttributes, render, setAttributes, setAttributesCSV, setAttributesMap, setBeanName, setContentType, setRequestContextAttribute

Methods inherited from class org.springframework.web.context.support.WebApplicationObjectSupport

getServletContext, getTempDir, getWebApplicationContext, isContextRequired

Methods inherited from class org.springframework.context.support.ApplicationObjectSupport

getApplicationContext, getMessageSourceAccessor, initApplicationContext, requiredContextClass, setApplicationContext

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

InternalResourceView

public InternalResourceView()

Constructor for use as a bean.

InternalResourceView

public InternalResourceView(String url)

Create a new InternalResourceView with the given URL.

Parameters:

url - the URL to forward to

Method Detail

renderMergedOutputModel

protected void renderMergedOutputModel(Map model,
                                       HttpServletRequest request,
                                       HttpServletResponse response)
                                throws Exception

Render the internal resource given the specified model. This includes setting the model as request attributes.

Specified by:

renderMergedOutputModel in class AbstractView

Parameters:

model - combined output Map (never null), with dynamic values taking precedence over static attributes

request - current HTTP request

response - current HTTP response

Throws:

Exception - if rendering failed

exposeModelAsRequestAttributes

protected void exposeModelAsRequestAttributes(Map model,
                                              HttpServletRequest request)
                                       throws Exception

Expose the model objects in the given map as request attributes. Names will be taken from the model Map.

Called by renderMergedOutputModel. This method is suitable for all resources reachable by RequestDispatcher.

Parameters:

model - Map of model objects to expose

request - current HTTP request

Throws:

Exception

See Also:

renderMergedOutputModel(java.util.Map, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse), RequestDispatcher

exposeHelpers

protected void exposeHelpers(HttpServletRequest request)
                      throws Exception

Expose helpers unique to each rendering operation. This is necessary so that different rendering operations can't overwrite each other's contexts etc.

Called by renderMergedTemplateModel. The default implementation is empty. This method can be overridden to add custom helpers as request attributes.

Parameters:

request - current HTTP request

Throws:

Exception - if there's a fatal error while we're adding attributes

See Also:

renderMergedOutputModel(java.util.Map, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse), JstlView.exposeHelpers(javax.servlet.http.HttpServletRequest), TilesJstlView.exposeHelpers(javax.servlet.http.HttpServletRequest)

prepareForRendering

protected String prepareForRendering(HttpServletRequest request,
                                     HttpServletResponse response)
                              throws Exception

Prepare for rendering, and determine the request dispatcher path to forward to (or to include).

This implementation simply returns the configured URL. Subclasses can override this to determine a resource to render, typically interpreting the URL in a different manner.

Parameters:

request - current HTTP request

response - current HTTP response

Returns:

the request dispatcher path to use

Throws:

Exception - if preparations failed

See Also:

AbstractUrlBasedView.getUrl(), TilesView.prepareForRendering(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)

useInclude

protected boolean useInclude(HttpServletRequest request,
                             HttpServletResponse response)

Determine whether to use RequestDispatcher's include or forward method.

Performs a check whether an include URI attribute is found in the request, indicating an include request, and whether the response has already been committed. In both cases, an include will be performed, as a forward is not possible anymore.

Parameters:

request - current HTTP request

response - current HTTP response

Returns:

true for include, false for forward

See Also:

RequestDispatcher.forward(javax.servlet.ServletRequest, javax.servlet.ServletResponse), RequestDispatcher.include(javax.servlet.ServletRequest, javax.servlet.ServletResponse), ServletResponse.isCommitted(), WebUtils.isIncludeRequest(javax.servlet.ServletRequest)