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Spring之WEB模块配置详解

时间:2021-02-27 11:18     来源/作者:冰河winner

Spring框架七大模块简单介绍

Spring中MVC模块代码详解

Spring的WEB模块用于整合Web框架,例如Struts1、Struts2、JSF等

整合Struts1

继承方式

Spring框架提供了ActionSupport类支持Struts1的Action。继承了ActionSupport后就能获取Spring的BeanFactory,从而获得各种Spring容器内的各种资源

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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,HttpServletResponseresponse){
    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

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<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加载Spring配置文件-->
  <listener-class>
    org.springframework.web.context.ContextLoaderListener
  </listener-class>
</listener>
 
<filter><!-- 使用Spring自带的字符过滤器-->
  <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>

如果与Hibernate结合使用,需要在web.xml中添加OpenSessionInViewFilter过滤器,将session范围扩大到JSP层,防止抛出延迟加载异常

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<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><!-- 对Struts 1的Action启用-->
</filter-mapping>

代理方式

继承方式融入Spring非常简单,但是缺点是代码与Spring发生了耦合,并且Action并没有交给Spring管理,因此不能使用Spring的AOP、IoC特性,使用代理方式则可以避免这些缺陷

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public class CatAction extends Action{ //此处继承的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,HttpServletResponseresponse){
    CatForm catForm = (CatForm) form;
    ICatService catService =getCatService();
    List<Cat> catList =catService.listCats();
    request.setAttribute("carList",catList);
 
    return mapping.find("list");
  }
}

这个Action没有与Spring发生耦合,只是定义了一个ICatService属性,然后由Spring负责注入

struts-congfig.xml配置

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<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,该配置把Struts的Action交给Spring代理-->
<controller processorClass="org.springframework.web.struts.DelegatingRequestProcessor" />
 
<!-- controller配置生效后,Action的type属性就是去作用了,Struts不会用type属性指定的类来创建CatAction,而是到Spring配置中寻找,因此Spring中必须配置CatAction -->
<!-- Spring中配置Action使用的是name属性而不是id,Spring会截获"/cat.do"的请求,将catService通过setter方法注入到CatAction中,并调用execute()方法-->
<bean name="/cat" class=" com.clf.spring.CatAction">
  <property name="catService" ref="catService" />
</bean>

web.xml的配置与上面的继承方式相同

使用代理方式的Action可以配置拦截器等Spring特性,例如给CatAction配置方法前拦截器和返回后拦截器

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<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

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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,还需要<contstant/>添加名为struts.objectFactory的常量,把值设为spring,表示该Action由Spring产生。然后把<action/>的class属性改为catAction,Struts2将会到Spring中寻找名为catAction的bean

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

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

web.xml配置

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<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加载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>

总结

以上就是本文关于Spring之WEB模块配置详解的全部内容,希望对大家有所帮助。感兴趣的朋友可以继续参阅本站其他相关专题,如有不足之处,欢迎留言指出。

参考:

Spring框架web项目实战全代码分享

原文链接:http://blog.csdn.net/u012152619/article/details/44258343

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