Spring与Struts1整合方式之通过Spring的DelegatingActionProxy类

　　Spring提供了DelegatingActionProxy类，用来代理Struts中的Action，负责在Spring配置文档中查找对应的Action映射，从而把Struts的Action与Spring分离开，并把Struts的动作置于Spring框架的控制之下。

　　1.创建web工程，将需要的资源包导入工程的WEB-INF/lib下，所需要的资源包包括：commons-beanutils- 1.8.0.jar、commons-chain-1.2.jar、commons-digester-1.8.jar、commons- logging-1.0.4.jar、log4j-1.2.14.jar、spring.jar、struts-core-1.3.10.jar、 struts-extras-1.3.10.jar。

　　2.配置web.xml，采用struts1分配请求连接，配置如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
    http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <!-- 定义Struts1请求处理对象 -->
    <servlet>
        <servlet-name>actionServlet</servlet-name>
        <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>

        <!-- 初始化配置文档 -->
        <init-param>
            <param-name>config</param-name>
            <param-value>struts.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <!-- 分配请求，将匹配*.do的请求交给actionServlet处理 -->
    <servlet-mapping>
        <servlet-name>actionServlet</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

    <display-name></display-name>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

web.xml

　　3.在classpath中导入struts.xml配置文件，文件内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration1.2//EN"
 "http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">
<struts-config>
    <form-beans>
        <form-bean name="helloWorld" type="com.luxl.action.HelloWorld"></form-bean>
    </form-beans>

    <!-- 配置请求连接 -->
    <action-mappings>
        <action path="/helloWorld" type="org.springframework.web.struts.DelegatingActionProxy" name="helloWorld">
            <forward name="show" path="/JSP/index.jsp"/>
        </action>
        <!-- 请求的URL对应于<action>中的path属性 -->
        <action path="/newHelloWorld"
                type="org.apache.struts.actions.ForwardAction"
                parameter="/JSP/newHelloWorld.jsp" />
    </action-mappings>

    <!-- 注册ContextLoaderPlugIn插件 -->
    <plug-in className="org.springframework.web.struts.ContextLoaderPlugIn">
        <set-property property="contextConfigLocation" value="/WEB-INF/spring.xml"></set-property>
    </plug-in>
</struts-config>

struts.xml

　　4.在WEB-INF/lib下导入spring.xml配置文件，文件内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
 "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <bean id="helloWorldService" class="com.luxl.service.impl.HelloWorldServiceImpl">
    </bean>

    <!-- 定义对应于struts.xml中的action的bean,name与action的path对应 -->
    <bean name="/helloWorld" class="com.luxl.action.HelloWorldAction">
        <property name="service">
            <ref bean="helloWorldService" />
        </property>
    </bean>
</beans>

spring.xml

　　5.定义Struts的Action类时，使其继承Struts的Action类，实例Action类如下：

package com.luxl.action;

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

import org.apache.log4j.Level;
import org.apache.log4j.Logger;
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 com.luxl.service.HelloWorldService;

public class HelloWorldAction extends Action{

    private Logger logger = Logger.getLogger(this.getClass());

    private HelloWorldService service;

    public HelloWorldService getService() {
        return service;
    }

    public void setService(HelloWorldService service) {
        this.service = service;
    }

    @Override
    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        // TODO Auto-generated method stub
        //通过ApplicationContext获取配置文件
        logger.log(Level.INFO, "receive request");
        String msg = service.addMsg((HelloWorld)form);
        request.setAttribute("helloWorld", msg);
        return mapping.findForward("show");
    }
}

HelloWorldAction.java

注：DelegatingActionProxy类比DelegatingRequestProcessor的优势在于，它代理的是Action，而不是RequestProcessor，即使用户自定义了RequestProcessor也无所谓。