Spring之WEB模塊

n672 11年前發布 | 20K 次閱讀 Spring JEE框架

Spring的WEB模塊用于整合Web框架，例如Struts 1、Struts 2、JSF等

整合Struts 1

繼承方式

Spring框架提供了ActionSupport類支持Struts 1的Action。繼承了ActionSupport后就能獲取Spring的BeanFactory，從而獲得各種Spring容器內的各種資源

import  org.springframework.web.struts.ActionSupport;

public class CatAction extends ActionSupport{
      public ICatService getCarService(){
             return (ICatService) getWebApplicationContext().getBean(＂catService＂);
      }
      public ActionForward execute(ActionMappingmapping,ActionForm form,HttpServletRequest request,HttpServletResponseresponse){
             CatForm catForm = (CatForm) form;
             if(＂list＂.equals(catForm.getAction())){
                    returnthis.list(mapping,form,request,response);
             }
      }

      public ActionForward list(ActionMappingmapping,ActionForm form,HttpServletRequest request,HttpServletResponse response){
             CatForm catForm = (CatForm) form;
             ICatService catService =getCatService();
             List<Cat> catList =catService.listCats();
             request.setAttribute(＂carList＂,catList);

             return mapping.find(＂list＂);
      }
}

Spring在web.xml中的配置

<context-param><!--  Spring配置文件的位置-->
      <param-name>contextConfigLocation</param-name>
      <param-value>/WEB-INF/classes/applicationContext.xml</param-value>
</context-param>

<listener><!--  使用Listener加載Spring配置文件-->
      <listener-class>
             org.springframework.web.context.ContextLoaderListener
      </listener-class>
</listener>

<filter><!--  使用Spring自帶的字符過濾器-->
      <filter-name>CharacterEncodingFilter</filter-name>
      <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
      <init-param>
             <param-name>encoding</param-name>
             <param-value>UTF-8</param-value>
      </init-param>
      <init-param>
             <param-name>forceEncoding</param-name>
             <param-value>true</param-value>
      </init-param>
</filter>
<filter-mapping>
      <filter-name>CharacterEncodingFilter</filter-name>
      <url-pattern>/*</url-pattern>
</filter-mapping>
如果與Hibernate結合使用，需要在web.xml中添加OpenSessionInViewFilter過濾器，將session范圍擴大到JSP層，防止拋出延遲加載異常
<filter>
      <filter-name>hibernateFilter</filter-name>
      <filter-class>org.springframework.orm.hibernate3.support. OpenSessionInViewFilter</filter-class>
</filter>
<filter-mapping>
      <filter-name> hibernateFilter </filter-name>
      <url-pattern>*.do</url-pattern><!--  對Struts 1的Action啟用-->
</filter-mapping>

代理方式

繼承方式融入Spring非常簡單，但是缺點是代碼與Spring發生了耦合，并且Action并沒有交給Spring管理，因此不能使用Spring的AOP、IoC特性，使用代理方式則可以避免這些缺陷

public class CatAction extends Action{  //此處繼承的Struts 1的Action
      private ICatService catService；
      //setter、getter略

      public ActionForward execute(ActionMappingmapping,ActionForm form,HttpServletRequest request,HttpServletResponseresponse){
             CatForm catForm = (CatForm) form;
             if(＂list＂.equals(catForm.getAction())){
                    returnthis.list(mapping,form,request,response);
             }
      }

      public ActionForward list(ActionMappingmapping,ActionForm form,HttpServletRequest request,HttpServletResponse response){
             CatForm catForm = (CatForm) form;
             ICatService catService =getCatService();
             List<Cat> catList =catService.listCats();
             request.setAttribute(＂carList＂,catList);

             return mapping.find(＂list＂);
      }
}

這個Action沒有與Spring發生耦合，只是定義了一個ICatService屬性，然后由Spring負責注入

struts-congfig.xml配置

<form-beans>
      <form-bean name=＂catForm＂ type=＂com.clf.spring.CatForm＂>
</form-beans>

<action-mappings>
      <action name=＂ catForm＂  path=＂/cat＂ type=＂com.clf.spring.CatAction＂>
             <forward name=＂list＂ path=＂/jsp/listCat.jsp＂></forward>
      </action>
</action-mappings>

<!--  最核心的配置，該配置把Struts的Action交給Spring代理-->
<controller processorClass=＂org.springframework.web.struts.DelegatingRequestProcessor＂ />

controller配置生效后，Action的type屬性就是去作用了，Struts不會用type屬性指定的類來創建CatAction，而是到Spring配置中尋找，因此Spring中必須配置CatAction

<!--  Spring中配置Action使用的是name屬性而不是id，Spring會截獲＂/cat.do＂的請求，將catService通過setter方法注入到CatAction中，并調用execute()方法-->
<bean name=＂/cat＂ class=＂ com.clf.spring.CatAction＂>
      <property name=＂catService＂ ref=＂catService＂ />
</bean>

web.xml的配置與上面的繼承方式相同

使用代理方式的Action可以配置攔截器等Spring特性，例如給CatAction配置方法前攔截器和返回后攔截器

<bean id=＂catBeforeInterceptor＂ class=＂org.springframework.aop.support.NameMatchMethodPointcutAdvodor＂>
      <property name=＂advice＂>
             <bean class=＂com.clf.spring.MethodBeforeInterceptor＂ />
      </property>
      <property name=＂mappedName＂ value=＂*＂></property>
</bean>

<bean id=＂catAfterInterceptor＂ class=＂org.springframework.aop.support.NameMatchMethodPointcutAdvodor＂>
      <property name=＂advice＂>
             <bean class=＂com.clf.spring.MethodAfterInterceptor＂ />
      </property>
      <property name=＂mappedName＂ value=＂*＂></property>
</bean>

<bean name=＂/cat＂ class=＂org.springframework.aop.framework.ProxyFactoryBean＂>
      <property name=＂interceptorNames＂>
             <list>
                    <value> catBeforeInterceptor</value>
                    <value> catAfterInterceptor</value>
             </list>
      </property>
      <property name=＂target＂>
             <bean class=＂com.clf.spring.CatAction＂>
                    <property name=＂catService＂ ref=＂catService＂></property>
             </bean>
      </property>
</bean>

整合Struts 2

Spring整合Struts 2需要struts2-spring-2.011.jar包

public class CatAction{
      private ICatService catService;
      private Cat cat;
      //setter、getter略

      public String list(){
             catService.listCats();
             return ＂list＂;
      }

      public String add(){
             catService.createCat(cat);
             return list();
      }
}

struts.xml配置

除了正常的配置之外，還需要<contstant/>添加名為struts.objectFactory的常量，把值設為spring，表示該Action由Spring產生。然后把<action/>的class屬性改為catAction，Struts 2將會到Spring中尋找名為catAction的bean

<constant name=＂ struts.objectFactory＂ value=＂spring＂ />

<package name=＂cat＂ extends=＂struts-default＂>
<action name=＂*_cat＂ method=＂{1}＂ class=＂catAction＂>
      <param name=＂action＂ >{1}</param>
      <result>/list.jsp</result>
      <result name=＂list＂>/list.jsp</result>
</action>
</package>

Spring配置

<bean id=＂catAction＂ scope=＂prototype＂ class=＂com.clf.spring.CatAction＂>
      <property name=＂catService＂ ref=＂catService＂></property>
</bean>

web.xml配置

<context-param><!--  Spring配置文件的位置-->
      <param-name>contextConfigLocation</param-name>
      <param-value>/WEB-INF/classes/applicationContext.xml</param-value>
</context-param>

<listener><!--  使用Listener加載Spring配置文件-->
<listener-class>
             org.springframework.web.context.ContextLoaderListener
      </listener-class>
</listener>
<filter>
      <filter-name>Struts2</filter-name>
      <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
      <filter-name> Struts2</filter-name>
      <url-pattern>/*</url-pattern>
</filter-mapping>

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Spring JEE框架

Spring之WEB模塊

整合Struts 1

整合Struts 2

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