零侵入实现Strtus1.3和Spring的集成
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;}}....<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>....
.... <!--command className="org.apache.struts.chain.commands.servlet.CreateAction"/--> <command className="struts.demo.command.ComponentAutowireInterceptor"/><!--替换原先的CreateAction-->....