web filter用spring注入对象

tomcat容器初始化顺序监听器–>过滤器–>servlet，因此springMVCservlet初始化之前，过滤器就已经初始化过了，如果在过滤器中需要注入spring容器管理的bean是注入不进去的，因此需要在spring监听器中初始化需要注入的bean，才能在过滤器中注入，而且过滤器的定义需要使用spring定义的DelegatingFilterProxy来实现，web.xml部分代码如下

如果要保留Filter原有的init，destroy方法的调用，还需要配置初始化参数targetFilterLifecycle为true，该参数默认为false，代码例子如下：

web.xml配置一

 <filter>
       <filter-name>clickstream</filter-name>
       <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
 
    <init-param>  
        <param-name>targetBeanName</param-name>  
        <param-value>clickstreamFilter</param-value>         
    </init-param>  
    <init-param>  
        <param-name>targetFilterLifecycle</param-name>  
        <param-value>true</param-value>  
    </init-param>

  </filter>     
     <filter-mapping>
       <filter-name>clickstream</filter-name>
       <url-pattern>/*</url-pattern>
     </filter-mapping>

web.xml配置二

<filter>
       <filter-name>clickstream</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>

<filter-mapping>
       <filter-name>clickstream</filter-name>
       <url-pattern>/*</url-pattern>
     </filter-mapping> 

基本上没有太大区别

@Componen("clickstreamFilter")    //这括号里面写不写一样的吧
public class ClickstreamFilter implements Filter {
    @Resource(name="locusRecordManager")  
    private ILocusRecordManager locusRecordManager;        
    public ILocusRecordManager getLocusRecordManager() {
        return locusRecordManager;
    }
    public void setLocusRecordManager(ILocusRecordManager locusRecordManager) {
        this.locusRecordManager = locusRecordManager;
    }

}

spring配置

注入Filter类

<bean  id="clickstreamFilter" class="com.ClickstreamFilter">

<property name="locusRecordManager"> //filter类的对象

<ref bean="locusRecordManager"/>  //service类的id

</property>

</bean>

注入service