struts和spring的整合方式对比

最新推荐文章于 2017-11-13 23:57:00 发布

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#struts #spring #java #web #xml

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本文介绍如何将Struts与Spring框架集成，通过三种方法实现Action对象的管理：使用ActionSupport类、DelegatingRequestProcessor类及DelegatingActionProxy类。重点讲解不同集成方式的工作原理与优缺点。

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1.业务Action类继承ActionSupport类

业务Action中可以调用ActionSupport类中的getWebApplicationContext(),来获得wac,然后

调用wac.getBean("myservice")来获得需要的service对象

这种方法虽然可以,但是不推荐使用,原因如下:

1>业务Action类跟Spring的ActionSupport类藕合在一起不是很好

2>getWebApplicationContext().getBean("myservice")这种硬编码不是很好

3>这种方法Spring并没有托管Action对象

2.使用Spring的DelegatingRequestProcessor类来替代struts的RequestProcessor类

struts-config.xml

<controller 
	locale= "true"
	processorClass= "org.springframework.web.struts.DelegatingRequestProcessor">
</controller>

DelegatingRequestProcessor类继承了RequestProcessor类,并重写了RequestProcessor的一些方法

DelegatingRequestProcessor.java

public class DelegatingRequestProcessor extends RequestProcessor {

	private WebApplicationContext webApplicationContext;
	

	public void init(ActionServlet actionServlet, ModuleConfig moduleConfig) throws ServletException {
		super.init(actionServlet, moduleConfig);
		if (actionServlet != null) {
			this.webApplicationContext = initWebApplicationContext(actionServlet, moduleConfig);
		}
	}

	protected WebApplicationContext initWebApplicationContext(
			ActionServlet actionServlet, ModuleConfig moduleConfig) throws IllegalStateException {

		return DelegatingActionUtils.findRequiredWebApplicationContext(actionServlet, moduleConfig);
	}

	protected final WebApplicationContext getWebApplicationContext() {
		return this.webApplicationContext;
	}

	protected Action processActionCreate(
			HttpServletRequest request, HttpServletResponse response, ActionMapping mapping)
			throws IOException {

		Action action = getDelegateAction(mapping);
		if (action != null) {
			return action;
		}
		return super.processActionCreate(request, response, mapping);
	}

	protected Action getDelegateAction(ActionMapping mapping) throws BeansException {
		String beanName = determineActionBeanName(mapping);
		if (!getWebApplicationContext().containsBean(beanName)) {
			return null;
		}
		return (Action) getWebApplicationContext().getBean(beanName, Action.class);
	}

	protected String determineActionBeanName(ActionMapping mapping) {
		return DelegatingActionUtils.determineActionBeanName(mapping);
	}

}

1>调用init方法的时候,初始化并获得wac

2>调用processActionCreate方法的时候,先从wac中getBean("prefix+path"),如果找不到再从struts内部获取

3.所有的业务Action都配置成DelegatingActionProxy类

struts-config.xml

<action-mappings>
    	<action path="/login" type="org.springframework.web.struts.DelegatingActionProxy" name="userForm" scope="request">
            <forward name="success" path="/WEB-INF/jsp/index.jsp"/>
        </action>
</action-mappings>

DelegatingActionProxy.java

public class DelegatingActionProxy extends Action {


	public ActionForward execute(
			ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
			throws Exception {

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


	
	protected Action getDelegateAction(ActionMapping mapping) throws BeansException {
		WebApplicationContext wac = getWebApplicationContext(getServlet(), mapping.getModuleConfig());
		String beanName = determineActionBeanName(mapping);
		return (Action) wac.getBean(beanName, Action.class);
	}

	
	protected WebApplicationContext getWebApplicationContext(
			ActionServlet actionServlet, ModuleConfig moduleConfig) throws IllegalStateException {

		return DelegatingActionUtils.findRequiredWebApplicationContext(actionServlet, moduleConfig);
	}

	
	protected String determineActionBeanName(ActionMapping mapping) {
		return DelegatingActionUtils.determineActionBeanName(mapping);
	}

}

DelegatingActionProxy重写了execute方法,当struts调用execute方法的时候,内部会调用wac.getBean("prefix+path")获取被Spring托管的Action对象,然后再调用业务Action对象的execute方法,其实就是利用了代理模式对Action进行代理

Spring的配置文件:

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd">
  	
	<bean id="loginService" class="prd.tidy.test.service.LoginService">
			
	</bean>
	
	<bean name="/login" class="prd.tidy.test.action.LoginAction" scope="prototype">
		<property name="loginService" ref="loginService">
		
		</property>
	</bean>
    
</beans>