Shiro_DelegatingFilterProxy

1.DelegatingFilterProxy实际上是Filter的一个代理对象。默认情况下，Spring会到IOC容器中查找与<filter-name>对应的filter bean。也可以通过targetBeanName的初始化参数来配置bean的id。

2.配置shiroFilter

--id必须和web.xml文件中配置的DelegatingFilterProxy的<filter-name>一致。为什么？（看下文）
--若不一致，则会抛出异常。因为Shiro会来IOC容器寻找与<filter-name>名字对应的filter Bean。

（1）查看org.springframework.web.filter.DelegatingFilterProxy的源码，

     /**
      * Return the name of the ServletContext attribute which should be used to retrieve the
      * {@link WebApplicationContext} from which to load the delegate {@link Filter} bean.
      */
     public String getContextAttribute() {
         return this.contextAttribute;
     }

     /**
      * Set the name of the target bean in the Spring application context.
      * The target bean must implement the standard Servlet Filter interface.
      * <p>By default, the {@code filter-name} as specified for the
      * DelegatingFilterProxy in {@code web.xml} will be used.
      */
     public void setTargetBeanName(String targetBeanName) {
         this.targetBeanName = targetBeanName;
     }

（2）做以下调整，

web.xml：

applicationContext.xml：

结果：可以正常运行。