org.springframework.web.servlet.view

Class JstlView

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

org.springframework.web.servlet.view.JstlView

All Implemented Interfaces:

Aware, BeanNameAware, InitializingBean, ApplicationContextAware, ServletContextAware, View

public class JstlView
extends InternalResourceView

Specialization of InternalResourceView for JSTL pages, i.e. JSP pages that use the JSP Standard Tag Library.

Exposes JSTL-specific request attributes specifying locale and resource bundle for JSTL's formatting and message tags, using Spring's locale and MessageSource.

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="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
   <property name="prefix" value="/WEB-INF/jsp/"/>
   <property name="suffix" value=".jsp"/>
 </bean>

 <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
   <property name="basename" value="messages"/>
 </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 to enable explicit JSTL support.

The specified MessageSource loads messages from "messages.properties" etc files in the class path. This will automatically be exposed to views as JSTL localization context, which the JSTL fmt tags (message etc) will use. Consider using Spring's ReloadableResourceBundleMessageSource instead of the standard ResourceBundleMessageSource for more sophistication. Of course, any other Spring components can share the same MessageSource.

This is a separate class mainly to avoid JSTL dependencies in InternalResourceView itself. JSTL has not been part of standard J2EE up until J2EE 1.4, so we can't assume the JSTL API jar to be available on the class path.

Hint: Set the AbstractView.setExposeContextBeansAsAttributes(boolean) flag to "true" in order to make all Spring beans in the application context accessible within JSTL expressions (e.g. in a c:out value expression). This will also make all such beans accessible in plain ${...} expressions in a JSP 2.0 page.

Since:

27.02.2003

Author:

Juergen Hoeller

See Also:

JstlUtils.exposeLocalizationContext(javax.servlet.http.HttpServletRequest, org.springframework.context.MessageSource), InternalResourceViewResolver, ResourceBundleMessageSource, ReloadableResourceBundleMessageSource

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

Fields inherited from interface org.springframework.web.servlet.View

PATH_VARIABLES, RESPONSE_STATUS_ATTRIBUTE, SELECTED_CONTENT_TYPE

Constructor Summary

Constructors

Constructor and Description
JstlView() Constructor for use as a bean.
JstlView(java.lang.String url) Create a new JstlView with the given URL.
JstlView(java.lang.String url, MessageSource messageSource) Create a new JstlView with the given URL.

Method Summary

Modifier and Type	Method and Description
protected void	exposeHelpers(HttpServletRequest request) Exposes a JSTL LocalizationContext for Spring's locale and MessageSource.
protected void	initServletContext(ServletContext servletContext) Wraps the MessageSource with a JSTL-aware MessageSource that is aware of JSTL's javax.servlet.jsp.jstl.fmt.localizationContext context-param.

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

getRequestDispatcher, isContextRequired, prepareForRendering, renderMergedOutputModel, setAlwaysInclude, setPreventDispatchLoop, useInclude

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, getRequestToExpose, getStaticAttributes, isExposePathVariables, prepareResponse, render, setAttributes, setAttributesCSV, setAttributesMap, setBeanName, setContentType, setExposeContextBeansAsAttributes, setExposedContextBeanNames, setExposePathVariables, setRequestContextAttribute, setResponseContentType, writeToResponse

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

getServletContext, getTempDir, getWebApplicationContext, initApplicationContext, 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

Constructor Detail

JstlView

public JstlView()

Constructor for use as a bean.

See Also:

AbstractUrlBasedView.setUrl(java.lang.String)

JstlView

public JstlView(java.lang.String url)

Create a new JstlView with the given URL.

Parameters:

url - the URL to forward to

JstlView

public JstlView(java.lang.String url,
                MessageSource messageSource)

Create a new JstlView with the given URL.

Parameters:

url - the URL to forward to

messageSource - the MessageSource to expose to JSTL tags (will be wrapped with a JSTL-aware MessageSource that is aware of JSTL's javax.servlet.jsp.jstl.fmt.localizationContext context-param)

See Also:

JstlUtils.getJstlAwareMessageSource(javax.servlet.ServletContext, org.springframework.context.MessageSource)

Method Detail

initServletContext

protected void initServletContext(ServletContext servletContext)

Wraps the MessageSource with a JSTL-aware MessageSource that is aware of JSTL's javax.servlet.jsp.jstl.fmt.localizationContext context-param.

Overrides:

initServletContext in class WebApplicationObjectSupport

Parameters:

servletContext - the ServletContext that this application object runs in (never null)

See Also:

JstlUtils.getJstlAwareMessageSource(javax.servlet.ServletContext, org.springframework.context.MessageSource)

exposeHelpers

protected void exposeHelpers(HttpServletRequest request)
                      throws java.lang.Exception

Exposes a JSTL LocalizationContext for Spring's locale and MessageSource.

Overrides:

exposeHelpers in class InternalResourceView

Parameters:

request - current HTTP request

Throws:

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

See Also:

JstlUtils.exposeLocalizationContext(javax.servlet.http.HttpServletRequest, org.springframework.context.MessageSource)