Spring MVC過濾器-委派過濾器代理(DelegatingFilterProxy)
阿新 • • 發佈:2019-01-31
org.springframework.web.filter中有一個特殊的類——DelegatingFilterProxy,該類其實並不能說是一個過濾器,它的原型是FilterToBeanProxy,即將Filter作為spring的bean,由spring來管理。
配置方式如下:
1.配置web.xml
方法1:(不要求filer-name與實現javax.servlet.Filter的bean的類名相同,只要將targetBeanName的value值設定為相應的bean的類名即可),但是這種方法不會執行filter的init()和destory()方法。
<filter >
<filter-name>testFilter2</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
<init-param>
<param-name>targetBeanName</param-name>
<param-value>testFilter2</param-value >
</init-param>
</filter>
<filter-mapping>
<filter-name>testFilter2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
方法2(要求filer-name與實現javax.servlet.Filter的bean的類名相同,但是這種方法不會執行filter的init()和destory()方法。):
<filter>
<filter-name>testFilter2</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-mapping>
<filter-name>testFilter2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
當然,也可以同時加上targetFilterLifecycle和targetBeanName引數,即:
<filter>
<filter-name>filter-name</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>
<init-param>
<param-name>targetBeanName</param-name>
<param-value>testFilter2</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>filter-name</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>