Spring Framework过滤器，未注入Bean [英] Spring Framework filter, bean not injected

问题描述

Servlet过滤器有2个条目，一个在web.xml中，一个在Spring applicationContext.xml中

There are 2 entries for a Servlet Filter, one in web.xml and one in Spring applicationContext.xml

我将过滤器添加到applicationContext.xml中，因为我想将creditProcessor bean注入其中.

I added the filter into applicationContext.xml because I wanted to inject creditProcessor bean into it.

唯一的问题是web.xml中的条目被JBoss选中然后使用，因此creditProcessor为空.

The only problem is that the entry in web.xml got picked up by JBoss and then used, so creditProcessor is null.

我是否必须使用Spring的delegatingFilterProxy或类似的东西，以便可以向Bean中注入东西，或者可以调整web.xml?

Do I have to use Spring's delegatingFilterProxy or similar so I can inject stuffs into the bean, or can I tweak the web.xml?

web.xml:

<filter>
    <filter-name>CreditFilter</filter-name>
    <filter-class>credit.filter.CreditFilter</filter-class>
</filter>

<filter-mapping>
    <filter-name>CreditFilter</filter-name>
    <url-pattern>/coverage/*</url-pattern>        
</filter-mapping>

Spring-applicationContext.xml:

Spring-applicationContext.xml:

<bean id="creditFilter" class="credit.filter.CreditFilter" >
      <property name="creditProcessor" ref="creditProcessor"/>
</bean>

推荐答案

您不能像这样对Filter Spring进行管理.使用您的设置，它会在每年春天实例化一次，并在servlet容器中实例化一次.相反，请使用 :

You can't make a Filter spring managed like this. With your setup it is instantiated once by spring, and once by the servlet container. Instead, use DelegatingFilterProxy:

1. 在web.xml中将过滤器代理声明为<filter>

2. 设置过滤器定义的targetBeanName init-param以指定应实际处理过滤的Bean:

1. declare the filter proxy as a <filter> in web.xml

2. Set the targetBeanName init-param of the filter definition to specify the bean that should actually handle the filtering:

<init-param>
    <param-name>targetBeanName</param-name>
    <param-value>creditFilter</param-value>
</init-param>

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