Spring学习笔记之整合struts

1、现有项目是通过

     <action    path="/aaaaAction"
                type="org.springframework.web.struts.DelegatingActionProxy"
                name="plDraftPrLineForm"
                scope="request"
                parameter="method"
                validate="true">
            <forward name="list" path="/aaa.jsp"/>
            <forward name="batchSetting" path="/bbb.jsp"/>
            <forward name="list" path="/ccc.jsp" />
            <forward name="edit" path="/dddd.jsp" />
            <forward name="create" path="/eeee" redirect="true"/>
            <forward name="delete" path="/ffffff" redirect="true"/>
        </action>

<bean name="/aaaaAction" class="com.AaaAction">
        <property name="a" ref="m />
        <property name="b" ref="e"/>
        <property name="c" ref="f" />
        <property name="d" ref="g" />
    </bean>

这样整合的

2、DelegatingActionProxy

英语中

delegate 是被推选出代表人(是一个团体的代表)
proxy 代表人(只代表一个人) 即委任别人替你参与(会议/投票)活动 (或要收费若委任的是尊业人士)。
agent 经纪人 / 代理 (尊业要收费的)

3、DelegatingActionProxy中

package org.springframework.web.struts;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.config.ModuleConfig;

import org.springframework.beans.BeansException;
import org.springframework.web.context.WebApplicationContext;

/**
* Proxy for a Spring-managed Struts <code>Action</code> that is defined in
* {@link ContextLoaderPlugIn ContextLoaderPlugIn‘s}
* {@link WebApplicationContext}.
*
* <p>The proxy is defined in the Struts config file, specifying this
* class as the action class. This class will delegate to a Struts
* <code>Action</code> bean in the <code>ContextLoaderPlugIn</code> context.
*
* <pre class="code">&lt;action path="/login" type="org.springframework.web.struts.DelegatingActionProxy"/&gt;</pre>
*
* The name of the <code>Action</code> bean in the
* <code>WebApplicationContext</code> will be determined from the mapping
* path and module prefix. This can be customized by overriding the
* <code>determineActionBeanName</code> method.
*
* <p>Example:
* <ul>
* <li>mapping path "/login" -> bean name "/login"<br>
* <li>mapping path "/login", module prefix "/mymodule" ->
* bean name "/mymodule/login"
* </ul>
*
* <p>A corresponding bean definition in the <code>ContextLoaderPlugin</code>
* context would look as follows; notice that the <code>Action</code> is now
* able to leverage fully Spring‘s configuration facilities:
*
* <pre class="code">
* &lt;bean name="/login" class="myapp.MyAction"&gt;
*   &lt;property name="..."&gt;...&lt;/property&gt;
* &lt;/bean&gt;</pre>
*
* Note that you can use a single <code>ContextLoaderPlugIn</code> 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
* <code>ContextLoaderPlugIn</code> per Struts module, specifying appropriate
* "contextConfigLocation" parameters. In both cases, the Spring bean name
* has to include the module prefix.
*
* <p>If you want to avoid having to specify <code>DelegatingActionProxy</code>
* as the <code>Action</code> type in your struts-config file (for example to
* be able to generate your Struts config file with XDoclet) consider using the
* {@link DelegatingRequestProcessor DelegatingRequestProcessor}.
* The latter‘s disadvantage is that it might conflict with the need
* for a different <code>RequestProcessor</code> subclass.
*
* <p>The default implementation delegates to the {@link DelegatingActionUtils}
* class as much as possible, to reuse as much code as possible with
* <code>DelegatingRequestProcessor</code> and
* {@link DelegatingTilesRequestProcessor}.
*
* <p>Note: The idea of delegating to Spring-managed Struts Actions originated in
* Don Brown‘s <a href="http://struts.sourceforge.net/struts-spring">Spring Struts Plugin</a>.
* <code>ContextLoaderPlugIn</code> and <code>DelegatingActionProxy</code>
* 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!
*
* @author Juergen Hoeller
* @since 1.0.1
* @see #determineActionBeanName
* @see DelegatingRequestProcessor
* @see DelegatingTilesRequestProcessor
* @see DelegatingActionUtils
* @see ContextLoaderPlugIn
* @deprecated as of Spring 3.0
*/
@Deprecated
public class DelegatingActionProxy extends Action {

    /**
     * Pass the execute call on to the Spring-managed delegate <code>Action</code>.
     * @see #getDelegateAction
     */
    @Override
    public ActionForward execute(
            ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
            throws Exception {

        Action delegateAction = getDelegateAction(mapping);
        return delegateAction.execute(mapping, form, request, response);
    }

    /**
     * Return the delegate <code>Action</code> for the given <code>mapping</code>.
     * <p>The default implementation determines a bean name from the
     * given <code>ActionMapping</code> and looks up the corresponding bean in
     * the {@link WebApplicationContext}.
     * @param mapping the Struts <code>ActionMapping</code>
     * @return the delegate <code>Action</code>
     * @throws BeansException if thrown by <code>WebApplicationContext</code> methods
     * @see #determineActionBeanName
     */
    protected Action getDelegateAction(ActionMapping mapping) throws BeansException {
        WebApplicationContext wac = getWebApplicationContext(getServlet(), mapping.getModuleConfig());
        String beanName = determineActionBeanName(mapping);
        return (Action) wac.getBean(beanName, Action.class);
    }

    /**
     * Fetch ContextLoaderPlugIn‘s {@link WebApplicationContext} from the
     * <code>ServletContext</code>, falling back to the root
     * <code>WebApplicationContext</code>.
     * <p>This context is supposed to contain the Struts <code>Action</code>
     * beans to delegate to.
     * @param actionServlet the associated <code>ActionServlet</code>
     * @param moduleConfig the associated <code>ModuleConfig</code>
     * @return the <code>WebApplicationContext</code>
     * @throws IllegalStateException if no <code>WebApplicationContext</code> could be found
     * @see DelegatingActionUtils#findRequiredWebApplicationContext
     * @see ContextLoaderPlugIn#SERVLET_CONTEXT_PREFIX
     */
    protected WebApplicationContext getWebApplicationContext(
            ActionServlet actionServlet, ModuleConfig moduleConfig) throws IllegalStateException {

        return DelegatingActionUtils.findRequiredWebApplicationContext(actionServlet, moduleConfig);
    }

    /**
     * Determine the name of the <code>Action</code> bean, to be looked up in
     * the <code>WebApplicationContext</code>.
     * <p>The default implementation takes the
     * {@link org.apache.struts.action.ActionMapping#getPath mapping path} and
     * prepends the
     * {@link org.apache.struts.config.ModuleConfig#getPrefix module prefix},
     * if any.
     * @param mapping the Struts <code>ActionMapping</code>
     * @return the name of the Action bean
     * @see DelegatingActionUtils#determineActionBeanName
     * @see org.apache.struts.action.ActionMapping#getPath
     * @see org.apache.struts.config.ModuleConfig#getPrefix
     */
    protected String determineActionBeanName(ActionMapping mapping) {
        return DelegatingActionUtils.determineActionBeanName(mapping);
    }

}