Web Filter中使用Spring注入bean
方法一：
web.xml配置一个

    <filter>        <filter-name>DelegatingFilterProxy</filter-name>        <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>        <init-param>            <param-name>targetBeanName</param-name>            <param-value>myFilter</param-value>         //自己过滤器的名字        </init-param>        <init-param>            <param-name>targetFilterLifecycle</param-name>            <param-value>true</param-value>        </init-param>    </filter>    <filter-mapping>        <filter-name>DelegatingFilterProxy</filter-name>        <url-pattern>/*</url-pattern>    </filter-mapping>

方法二：
web.xml配置一个

    <filter>        <filter-name>myFilter</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>DelegatingFilterProxy</filter-name>        <url-pattern>/*</url-pattern>    </filter-mapping>

方法一或者二不同的地方就是在web.xml中的写法不同而已没有太大的区别，配完web.xml之后还要配置applicationContext.xml中的bean。
applicationContext.xml配置:

<bean id="myFilter" parent="baseTransactionProxy">//这里的service封装了所有对数据库的操作        <property name="target">            <bean class="com.maimaiche.service.MaiMaiCheServiceImpl">             ......             </bean>       </property></bean>