org.springframework.web.servlet.view

Class AbstractTemplateView

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.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

Fields

Modifier and Type	Field and Description
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

PATH_VARIABLES, RESPONSE_STATUS_ATTRIBUTE, SELECTED_CONTENT_TYPE

Constructor Summary

Constructors

Constructor and Description
AbstractTemplateView()

Method Summary

Methods

Modifier and Type	Method and Description
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, createMergedOutputModel, createRequestContext, createTemporaryOutputStream, exposeModelAsRequestAttributes, generatesDownloadContent, getAttributesMap, getBeanName, getContentType, getRequestContextAttribute, getStaticAttributes, isExposePathVariables, prepareResponse, render, setAttributes, setAttributesCSV, setAttributesMap, setBeanName, setContentType, setExposePathVariables, setRequestContextAttribute, setResponseContentType, 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