org.springframework.web.servlet.view
Class AbstractTemplateView

java.lang.Object
  extended by org.springframework.context.support.ApplicationObjectSupport
      extended by org.springframework.web.context.support.WebApplicationObjectSupport
          extended by org.springframework.web.servlet.view.AbstractView
              extended by org.springframework.web.servlet.view.AbstractUrlBasedView
                  extended by org.springframework.web.servlet.view.AbstractTemplateView
All Implemented Interfaces:
Aware, BeanNameAware, InitializingBean, ApplicationContextAware, ServletContextAware, View
Direct Known Subclasses:
FreeMarkerView, VelocityView

public abstract class AbstractTemplateView
extends AbstractUrlBasedView

Adapter base class for template-based view technologies such as Velocity and FreeMarker, with the ability to use request and session attributes in their model and the option to expose helper objects for Spring's Velocity/FreeMarker macro library.

JSP/JSTL and other view technologies automatically have access to the HttpServletRequest object and thereby the request/session attributes for the current user. Furthermore, they are able to create and cache helper objects as request attributes themselves.

Since:
1.0.2
Author:
Juergen Hoeller, Darren Davison
See Also:
AbstractTemplateViewResolver, VelocityView, FreeMarkerView

Field Summary
static String SPRING_MACRO_REQUEST_CONTEXT_ATTRIBUTE
          Variable name of the RequestContext instance in the template model, available to Spring's macros: e.g.
 
Fields inherited from class org.springframework.web.servlet.view.AbstractView
DEFAULT_CONTENT_TYPE
 
Fields inherited from class org.springframework.context.support.ApplicationObjectSupport
logger
 
Fields inherited from interface org.springframework.web.servlet.View
RESPONSE_STATUS_ATTRIBUTE
 
Constructor Summary
AbstractTemplateView()
           
 
Method Summary
protected  void applyContentType(HttpServletResponse response)
          Apply this view's content type as specified in the "contentType" bean property to the given response.
protected  void renderMergedOutputModel(Map<String,Object> model, HttpServletRequest request, HttpServletResponse response)
          Subclasses must implement this method to actually render the view.
protected abstract  void renderMergedTemplateModel(Map<String,Object> model, HttpServletRequest request, HttpServletResponse response)
          Subclasses must implement this method to actually render the view.
 void setAllowRequestOverride(boolean allowRequestOverride)
          Set whether HttpServletRequest attributes are allowed to override (hide) controller generated model attributes of the same name.
 void setAllowSessionOverride(boolean allowSessionOverride)
          Set whether HttpSession attributes are allowed to override (hide) controller generated model attributes of the same name.
 void setExposeRequestAttributes(boolean exposeRequestAttributes)
          Set whether all request attributes should be added to the model prior to merging with the template.
 void setExposeSessionAttributes(boolean exposeSessionAttributes)
          Set whether all HttpSession attributes should be added to the model prior to merging with the template.
 void setExposeSpringMacroHelpers(boolean exposeSpringMacroHelpers)
          Set whether to expose a RequestContext for use by Spring's macro library, under the name "springMacroRequestContext".
 
Methods inherited from class org.springframework.web.servlet.view.AbstractUrlBasedView
afterPropertiesSet, checkResource, getUrl, isUrlRequired, setUrl, toString
 
Methods inherited from class org.springframework.web.servlet.view.AbstractView
addStaticAttribute, createRequestContext, createTemporaryOutputStream, exposeModelAsRequestAttributes, generatesDownloadContent, getAttributesMap, getBeanName, getContentType, getRequestContextAttribute, getStaticAttributes, prepareResponse, render, setAttributes, setAttributesCSV, setAttributesMap, setBeanName, setContentType, setRequestContextAttribute, writeToResponse
 
Methods inherited from class org.springframework.web.context.support.WebApplicationObjectSupport
getServletContext, getTempDir, getWebApplicationContext, initApplicationContext, initServletContext, isContextRequired, setServletContext
 
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
 

Field Detail

SPRING_MACRO_REQUEST_CONTEXT_ATTRIBUTE

public static final String SPRING_MACRO_REQUEST_CONTEXT_ATTRIBUTE
Variable name of the RequestContext instance in the template model, available to Spring's macros: e.g. for creating BindStatus objects.

See Also:
Constant Field Values
Constructor Detail

AbstractTemplateView

public AbstractTemplateView()
Method Detail

setExposeRequestAttributes

public void setExposeRequestAttributes(boolean exposeRequestAttributes)
Set whether all request attributes should be added to the model prior to merging with the template. Default is "false".


setAllowRequestOverride

public void setAllowRequestOverride(boolean allowRequestOverride)
Set whether HttpServletRequest attributes are allowed to override (hide) controller generated model attributes of the same name. Default is "false", which causes an exception to be thrown if request attributes of the same name as model attributes are found.


setExposeSessionAttributes

public void setExposeSessionAttributes(boolean exposeSessionAttributes)
Set whether all HttpSession attributes should be added to the model prior to merging with the template. Default is "false".


setAllowSessionOverride

public void setAllowSessionOverride(boolean allowSessionOverride)
Set whether HttpSession attributes are allowed to override (hide) controller generated model attributes of the same name. Default is "false", which causes an exception to be thrown if session attributes of the same name as model attributes are found.


setExposeSpringMacroHelpers

public void setExposeSpringMacroHelpers(boolean exposeSpringMacroHelpers)
Set whether to expose a RequestContext for use by Spring's macro library, under the name "springMacroRequestContext". Default is "true".

Currently needed for Spring's Velocity and FreeMarker default macros. Note that this is not required for templates that use HTML forms unless you wish to take advantage of the Spring helper macros.

See Also:
SPRING_MACRO_REQUEST_CONTEXT_ATTRIBUTE

renderMergedOutputModel

protected final void renderMergedOutputModel(Map<String,Object> model,
                                             HttpServletRequest request,
                                             HttpServletResponse response)
                                      throws Exception
Description copied from class: AbstractView
Subclasses must implement this method to actually render the view.

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.

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

applyContentType

protected void applyContentType(HttpServletResponse response)
Apply this view's content type as specified in the "contentType" bean property to the given response.

When running on Servlet 2.4, only applies the view's contentType if no content type has been set on the response before. This allows handlers to override the default content type beforehand.

Parameters:
response - current HTTP response
See Also:
AbstractView.setContentType(java.lang.String)

renderMergedTemplateModel

protected abstract void renderMergedTemplateModel(Map<String,Object> model,
                                                  HttpServletRequest request,
                                                  HttpServletResponse response)
                                           throws Exception
Subclasses must implement this method to actually render the view.

Parameters:
model - combined output Map, with request attributes and session attributes merged into it if required
request - current HTTP request
response - current HTTP response
Throws:
Exception - if rendering failed