DelegatingActionProxy (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.web.struts
Class DelegatingActionProxy

java.lang.Object
  org.apache.struts.action.Action
      org.springframework.web.struts.DelegatingActionProxy

public class DelegatingActionProxy
extends Action
extends Action

Proxy for a Spring-managed Struts Action that's defined in ContextLoaderPlugIn's WebApplicationContext.

The proxy is defined in the Struts config file, specifying this class as action class. It will delegate to a Struts Action bean in the ContextLoaderPlugIn context.

 <action path="/login" type="org.springframework.web.struts.DelegatingActionProxy"/>

The name of the Action bean in the WebApplicationContext will be determined from the mapping path and module prefix. This can be customized by overriding the determineActionBeanName method.

Example:

mapping path "/login" -> bean name "/login"
mapping path "/login", module prefix "/mymodule" -> bean name "/mymodule/login"

A corresponding bean definition in the ContextLoaderPlugin context looks as follows, being able to fully leverage Spring's configuration facilities:

 <bean name="/login" class="myapp.MyAction">
   <property name="...">...</property>
 </bean>

Note that you can use a single ContextLoaderPlugIn for all Struts modules. That context can in turn be loaded from multiple XML files, for example split according to Struts modules. Alternatively, define one ContextLoaderPlugIn per Struts module, specifying appropriate "contextConfigLocation" parameters. In both cases, the Spring bean name has to include the module prefix.

If you want to avoid having to specify DelegatingActionProxy as Action type in your struts-config, for example to be able to generate your Struts config file with XDoclet, consider DelegatingRequestProcessor. The latter's disadvantage is that it might conflict with the need for a different RequestProcessor subclass.

The default implementation delegates to the DelegatingActionUtils class as fas as possible, to reuse as much code as possible with DelegatingRequestProcessor and DelegatingTilesRequestProcessor.

Note: The idea of delegating to Spring-managed Struts Actions originated in Don Brown's Spring Struts Plugin. ContextLoaderPlugIn and DelegatingActionProxy constitute a clean-room implementation of the same idea, essentially superseding the original plugin. Many thanks to Don Brown and Matt Raible for the original work and for the agreement to reimplement the idea in Spring proper!

Since:: 1.0.1
Author:: Juergen Hoeller
See Also:: determineActionBeanName(org.apache.struts.action.ActionMapping), DelegatingRequestProcessor, DelegatingTilesRequestProcessor, DelegatingActionUtils, ContextLoaderPlugIn

Field Summary

Fields inherited from class org.apache.struts.action.Action

defaultLocale, servlet

Constructor Summary

DelegatingActionProxy()


Method Summary

protected String determineActionBeanName(ActionMapping mapping)
          Determine the name of the Action bean, to be looked up in the WebApplicationContext.

ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
          Pass the execute call on to the Spring-managed delegate Action.

protected Action getDelegateAction(ActionMapping mapping)
          Return the delegate Action for the given mapping.

protected WebApplicationContext getWebApplicationContext(ActionServlet actionServlet, ModuleConfig moduleConfig)
          Fetch ContextLoaderPlugIn's WebApplicationContext from the ServletContext, falling back to the root WebApplicationContext.

Methods inherited from class org.apache.struts.action.Action

addErrors, addMessages, execute, generateToken, getDataSource, getDataSource, getErrors, getLocale, getMessages, getResources, getResources, getServlet, isCancelled, isTokenValid, isTokenValid, resetToken, saveErrors, saveErrors, saveErrors, saveMessages, saveMessages, saveToken, setLocale, setServlet

Methods inherited from class java.lang.Object

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

Fields inherited from class org.apache.struts.action.Action
`defaultLocale, servlet`

Constructor Summary
`DelegatingActionProxy()`

Method Summary
`protected String`	`determineActionBeanName(ActionMapping mapping)` Determine the name of the Action bean, to be looked up in the WebApplicationContext.
`ActionForward`	`execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)` Pass the execute call on to the Spring-managed delegate Action.
`protected Action`	`getDelegateAction(ActionMapping mapping)` Return the delegate Action for the given mapping.
`protected WebApplicationContext`	`getWebApplicationContext(ActionServlet actionServlet, ModuleConfig moduleConfig)` Fetch ContextLoaderPlugIn's WebApplicationContext from the ServletContext, falling back to the root WebApplicationContext.

Methods inherited from class org.apache.struts.action.Action
`addErrors, addMessages, execute, generateToken, getDataSource, getDataSource, getErrors, getLocale, getMessages, getResources, getResources, getServlet, isCancelled, isTokenValid, isTokenValid, resetToken, saveErrors, saveErrors, saveErrors, saveMessages, saveMessages, saveToken, setLocale, setServlet`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail