Spring-MultiActionController

如果为每个请求都设计一个controller的话，随着开发的进行，工程也一定会日渐庞大。当然，Spring框架提供了避免这种情况出现的方法，那就是使你的controller继承自org.springframework.web.servlet.mvc.multiaction.MultiActionController。就像Struts里的DispatchAction一样，MultiActionController可以处理多个类似的请求。

   在Struts里，要使用DispatchAction只需要在其action的定义中加入parameter="method"即可。在Spring中，MultiActionController要配合一个org.springframework.web.servlet.mvc.multiaction.MethodNameResolver的实例使用（MethodNameResolver也是一个接口），但我个人认为这并不说明Spring比struts繁琐，在使用中自会体会到它的好处。

   MultiActionController的默认MethodNameResolver是org.springframework.web.servlet.mvc.multiaction.InternalPathMethodNameResolver。这个实现类是依据请求的路径来决定执行MultiActionController的那个方法的。例如路径为：getlist.htm，则执行相应controller的getlist方法。在实际开发中，不提倡使用这个MethodNameResolver。

    一般情况下，MultiActionController搭配的MethodNameResolver是org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver或org.springframework.web.servlet.mvc.multiaction.PropertiesMethodNameResolver，它们都是根据请求的参数来决定使用那个方法

UrlFileBuildAction.java

package org.dispenseModule.web;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;

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

import org.dispenseModule.service.IUrlsService;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

public class UrlFileBuildAction extends MultiActionController{
 private String fail_view;

 private String success_view;
 
 private IUrlsService urlsService;
 
 public void setFail_view(String fail_view) {
  this.fail_view = fail_view;
 }

 public void setSuccess_view(String success_view) {
  this.success_view = success_view;
 }
   
 public void setUrlsService(IUrlsService urlsService) {
  this.urlsService = urlsService;
 }

 public ModelAndView htmlFile(HttpServletRequest request,
   HttpServletResponse response) throws Exception {
       String urls=urlsService.getUrls("html");
       String filePath="F:/urlFile";
       try{
    File myFilePath = new File(filePath);
        if (!myFilePath.exists()) {
          myFilePath.mkdirs();
        }
        FileWriter write=new FileWriter(filePath+"/htmlUrl.txt");
        BufferedWriter writer=new BufferedWriter(write);
         writer.write(urls);
         writer.flush();
         String success = "生成成功";
         writer.close();
         writer.close();
         return new ModelAndView(this.success_view,"success",success);
       }catch(Exception e){
        String fail = "生成失败";
        return new ModelAndView(this.fail_view, "fail", fail);
       }
   
 }
 
 public ModelAndView ubbFile(HttpServletRequest request,
   HttpServletResponse response) throws Exception {
       String urls=urlsService.getUrls("ubb");
       String filePath="F:/urlFile";
       try{
    File myFilePath = new File(filePath);
        if (!myFilePath.exists()) {
          myFilePath.mkdirs();
        }
        FileWriter write=new FileWriter(filePath+"/ubbUrl.txt");
        BufferedWriter writer=new BufferedWriter(write);
         writer.write(urls);
         writer.flush();
         String success = "生成成功";
         writer.close();
         writer.close();
         return new ModelAndView(this.success_view,"success",success);
       }catch(Exception e){
        String fail = "生成失败";
        return new ModelAndView(this.fail_view, "fail", fail);
       }
   
 }
}

一、使用ParameterMethodNameResolver

1、配置applicationContext.xml

<bean id="methodNameResolver" class="org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver">
 <property name="paramName">
   <value>method</value>
  </property>
  <property name="defaultMethodName">
   <value>htmlFile</value>
  </property>

我在测试过程中，如何没有设置defaultMethodName,都不能通过

2、配置applicationContext-action.xml

 <bean id="urlFileBuildAction" class="org.dispenseModule.web.UrlFileBuildAction">
       <property name="fail_view">
      <value>fail</value>
  </property>
  <property name="success_view">
   <value>success</value>
  </property>
  <property name="urlsService">
   <ref bean="urlsService" />
  </property>
  <property name="methodNameResolver">
    <ref bean="methodNameResolver"/>
  </property>
   </bean>

<bean id="handlerMapping"
  class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
  <!--  <property name="defaultHandler" ref="urlFileBuildAction"/>-->
  <property name="mappings">
   <props>

<prop key="/urlFileBuildAction.do">urlFileBuildAction</prop>
   </props>
  </property>
 </bean>

使用方法urlFileBuildAction.do?method=htmlFile

二、使用PropertiesMethodNameResolver

1、配置applicatonContext.xml

<bean id="methodNameResolver" class="org.springframework.web.servlet.mvc.multiaction.PropertiesMethodNameResolver">
 <property name="mappings">
<props>
<prop key="/urlhtmlFileBuildAction.do">htmlFile</prop>

<prop key="/urlubbFileBuildAction.do">ubbFile</prop>
</props>
</property>
</bean>

2、配置applicatonContext-action.xml

<bean id="handlerMapping"
class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="defaultHandler" ref=" sampleMultiMethodController "/>
</bean>

 <bean id="urlFileBuildAction" class="org.dispenseModule.web.UrlFileBuildAction">
       <property name="fail_view">
      <value>fail</value>
  </property>
  <property name="success_view">
   <value>success</value>
  </property>
  <property name="urlsService">
   <ref bean="urlsService" />
  </property>
  <property name="methodNameResolver">
    <ref bean="methodNameResolver"/>
  </property>
   </bean>

使用urlhtmlFileBuildAction.do

评论

1 楼 gimy 2009-03-19  

写的很清楚，谢谢！