在web.xml中进行配置,对所有的URL请求进行过滤,就像"击鼓传花"一样,链式处理。
配置分为两种A和B。
A:普通配置
在web.xml中增加如下内容:
<filter>
<filter-name>permissionFilter</filter-name>
<filter-class>com.taobao.riskm.filter.PermissionFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>permissionFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
由filter和filter-mapping构成。filter指定过滤器处理类(实现了Filter接口),filter-mapping指定过滤的规则。
<filter>
<filter-name>permissionFilter</filter-name>
<filter-class>com.taobao.riskm.filter.PermissionFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>permissionFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
由filter和filter-mapping构成。filter指定过滤器处理类(实现了Filter接口),filter-mapping指定过滤的规则。
B:高级配置(允许代理注入Spring bean)
在web.xml中增加如下内容:
<filter>
<filter-name>permission</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
<init-param>
<param-name>targetFilterLifecycle</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>permission</filter-name>
<url-pattern>*.htm</url-pattern>
</filter-mapping>
在spring bean配置中加入:
<bean id="permission" class="com.taobao.kfc.kwb.web.permission.PermissionHttpServlet"></bean>
<filter>
<filter-name>permission</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
<init-param>
<param-name>targetFilterLifecycle</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>permission</filter-name>
<url-pattern>*.htm</url-pattern>
</filter-mapping>
在spring bean配置中加入:
<bean id="permission" class="com.taobao.kfc.kwb.web.permission.PermissionHttpServlet"></bean>
因为filter比bean先加载,也就是spring会先加载filter指定的类到container中,这样filter中注入的spring bean就为null了。
解决办法:
先filter中加入DelegatingFilterProxy类,"targetFilterLifecycle"指明作用于filter的所有生命周期。
原理是,DelegatingFilterProxy类是一个代理类,所有的请求都会首先发到这个filter代理,然后再按照"filter-name"委派到spring中的这个bean。
在Spring中配置的bean的name要和web.xml中的<filter-name>一样.
------------------------------------------------------------------------------------------------------
在Shiro的配置文件中,发现与上述有所差异,Spring中配置的bean的name如下
在web.xml中
<filter> <filter-name>shiroFilter</filter-name> <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class> <init-param> <param-name>targetFilterLifecycle</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>shiroFilter</filter-name> <url-pattern>/actions/*</url-pattern> </filter-mapping>
<!-- Shiro Filter 拦截器相关配置 --> <bean id="shiroFilter" class="org.apache.shiro.spring.web.ShiroFilterFactoryBean"> <!-- securityManager --> <property name="securityManager" ref="securityManager"/> <!-- 重新登录路径 --> <property name="loginUrl" value="/actions/invalid"/> <!-- 用户访问无权限的链接时跳转此页面 --> <property name="unauthorizedUrl" value="/actions/index"/> <!-- 验证成功跳转此页面 --> <property name="successUrl" value="/actions/secured/home"/> <!-- 过滤链定义 --> <property name="filterChainDefinitions"> <value><!-- 注意拦截顺序,从上往下依次设置--> /actions/locale* = anon /actions/index* = anon /actions/logout = logout /actions/security/authenticate* = anon /actions/secured/** = authc,userAccessControlFilter /actions/**=authc </value> </property> <property name="filters"> <map> <entry key="userAccessControlFilter" value-ref="userAccessControlFilter"/> <entry key="logout" value-ref="logoutFilter"/> </map> </property> </bean>
<!-- Shiro 生命周期处理器,,保证实现shiro内部的生命周期函数bean的执行 --> <bean id="lifecycleBeanPostProcessor" class="org.apache.shiro.spring.LifecycleBeanPostProcessor"/>