Struts1.3与Spring以底侵入方式集成

以前都是用webwork，最近因为遗留项目的维护，捣腾起struts1.x，原先的代码到处充斥着ApplicationContext.getBean的代码，实在没法容忍，上网找了struts和spring集成的例子，基本上都是struts1.3以前版本的代码，很不优雅。struts1.3和之前版本相比，使用command-chain来处理请求，有点类似于webwork的拦截器，下面介绍下整个实现思路，欢迎批评指正。

1、首先需要一个ServletContextListener，用于获取Spring的ApplicationContext实例（使用Quake Wang的jert的代码），具体请参考附件源码

2、定义ComponentAutowireInterceptor实现ActionCommon接口，以实现spring bean的注入，这里为了方便，直接从CreateAction继承：

/**
 * $Revision: 1.0 $
 * Created: 2007-8-17
 * $Date: 2007-8-17 $
 *
 * Author: Keven Chen
 */
package struts.demo.command;

import org.apache.struts.action.Action;
import org.apache.struts.chain.commands.servlet.CreateAction;
import org.apache.struts.chain.contexts.ActionContext;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.comwave.webui.core.container.Application;

/**
 * @author Keven Chen
 * @version $Revision 1.0 $
 *
 */
public class ComponentAutowireInterceptor extends CreateAction {

    protected Action createAction(ActionContext context, String type) throws Exception {
        Action action = super.createAction(context, type);
        if(action !=null){
            Application.getInstance().getContainer().autowireComponent(action);
            System.out.println("装配Action");
        }
        return action;
    }

}

/**
 * $Revision: 1.0 $
 * Created: 2007-8-17
 * $Date: 2007-8-17 $
 * 
 * Author: Keven Chen
 */
package struts.demo.command;

import org.apache.struts.action.Action;
import org.apache.struts.chain.commands.servlet.CreateAction;
import org.apache.struts.chain.contexts.ActionContext;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.comwave.webui.core.container.Application;

/**
 * @author Keven Chen
 * @version $Revision 1.0 $
 *
 */
public class ComponentAutowireInterceptor extends CreateAction {
	
	protected Action createAction(ActionContext context, String type) throws Exception {
		Action action = super.createAction(context, type);
		if(action !=null){
			Application.getInstance().getContainer().autowireComponent(action);
			System.out.println("装配Action");
		}
		return action;
	}

}

3、配置web.xml和chain-config.xml配置片段（完整配置请参考附件代码）

web.xml

....
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring/applicationContext*.xml</param-value>
    </context-param>

    <listener>        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <listener>        <listener-class>com.comwave.webui.core.web.listener.DefaultApplicationSetupListener</listener-class>
    </listener>

    <servlet>
        <servlet-name>action</servlet-name>
        <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
        <init-param>
            <param-name>config</param-name>
            <param-value>struts/struts-config.xml</param-value>
        </init-param>
        <init-param>
            <param-name>chainConfig</param-name>
            <param-value>struts/chain-config.xml</param-value>
        </init-param>
        <load-on-startup>2</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>action</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>
....

....
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:spring/applicationContext*.xml</param-value>
	</context-param>
	
	<listener>		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>

	<listener>		<listener-class>com.comwave.webui.core.web.listener.DefaultApplicationSetupListener</listener-class>
	</listener>
	
	<servlet>
		<servlet-name>action</servlet-name>
		<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
		<init-param>
			<param-name>config</param-name>
			<param-value>struts/struts-config.xml</param-value>
		</init-param>
		<init-param>
			<param-name>chainConfig</param-name>
			<param-value>struts/chain-config.xml</param-value>
		</init-param>
		<load-on-startup>2</load-on-startup>
	</servlet>

	<servlet-mapping>
		<servlet-name>action</servlet-name>
		<url-pattern>*.do</url-pattern>
	</servlet-mapping>
....

chain-config.xml

....
     <!--command className="org.apache.struts.chain.commands.servlet.CreateAction"/-->

     <command className="struts.demo.command.ComponentAutowireInterceptor"/><!--替换原先的CreateAction-->
....

....
     <!--command className="org.apache.struts.chain.commands.servlet.CreateAction"/-->

     <command className="struts.demo.command.ComponentAutowireInterceptor"/><!--替换原先的CreateAction-->
....

Struts的Action无需实现任何接口，也不需要特别的配置，就可以自动实现spring bean的注入。

 

原文摘自：http://balaschen.iteye.com/blog/113507