org.displaytag.filter
Class DisplayTagSpringInterceptor

java.lang.Object
  org.displaytag.filter.DisplayTagSpringInterceptor

All Implemented Interfaces:

org.springframework.web.servlet.HandlerInterceptor

public class DisplayTagSpringInterceptor
extends java.lang.Object
implements org.springframework.web.servlet.HandlerInterceptor

Allow the author of an included JSP page to reset the content type to something else (like a binary stream), and then write the new info back as the exclusive response, clearing the buffers of all previously added content.

This interceptor allows TableTag users to perform exports from pages that are run as includes, such as from Struts or a jsp:include. If that is your intention, just add this interceptor to your spring dispatcher context xml and map it to the appropriate requests, using something like:

 <bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
   <property name="interceptors">
     <list>
       <bean class="org.displaytag.filter.DisplayTagSpringInterceptor"/>
     </list>
   </property
 </bean>
 

By default the interceptor buffers all the export content before writing it out. You can set an optional parameter buffer to false to make the interceptor write directly to the output stream. This could be faster and uses less memory, but the content length will not be set.

  <bean class="org.displaytag.filter.DisplayTagSpringInterceptor">
      <property name="buffer"><value>false</value></property>
  </bean>
  

Version:

$Revision: 1081 $ ($Author: fgiust $)

Author:

Keith Garry Boyce, rapruitt, Fabrizio Giustina

Constructor Summary

DisplayTagSpringInterceptor()

Method Summary

void	afterCompletion(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, java.lang.Object obj, java.lang.Exception exception)
void	postHandle(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, java.lang.Object obj, org.springframework.web.servlet.ModelAndView modelAndView)
boolean	preHandle(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, java.lang.Object handler)
void	setBuffer(boolean bufferingEnabled) Sets the buffer state.

Methods inherited from class java.lang.Object

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

Constructor Detail

DisplayTagSpringInterceptor

public DisplayTagSpringInterceptor()

Method Detail

setBuffer

public void setBuffer(boolean bufferingEnabled)

Sets the buffer state.

Parameters:

bufferingEnabled - it true buffering will be used

preHandle

public boolean preHandle(javax.servlet.http.HttpServletRequest request,
                         javax.servlet.http.HttpServletResponse response,
                         java.lang.Object handler)
                  throws java.lang.Exception

Specified by:

preHandle in interface org.springframework.web.servlet.HandlerInterceptor

Throws:

java.lang.Exception

See Also:

HandlerInterceptor.preHandle(HttpServletRequest,HttpServletResponse, Object)

postHandle

public void postHandle(javax.servlet.http.HttpServletRequest request,
                       javax.servlet.http.HttpServletResponse response,
                       java.lang.Object obj,
                       org.springframework.web.servlet.ModelAndView modelAndView)
                throws java.lang.Exception

Specified by:

postHandle in interface org.springframework.web.servlet.HandlerInterceptor

Throws:

java.lang.Exception

See Also:

HandlerInterceptor.postHandle(HttpServletRequest,HttpServletResponse, Object, ModelAndView)

afterCompletion

public void afterCompletion(javax.servlet.http.HttpServletRequest request,
                            javax.servlet.http.HttpServletResponse response,
                            java.lang.Object obj,
                            java.lang.Exception exception)
                     throws java.lang.Exception

Specified by:

afterCompletion in interface org.springframework.web.servlet.HandlerInterceptor

Throws:

java.lang.Exception

See Also:

HandlerInterceptor.afterCompletion(HttpServletRequest,HttpServletResponse, Object, Exception)