正确配置:
spring配置
A.配置命名空间

<beans xmlns="http://www.springframework.org/schema/beans" 

 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

 xmlns:aop="http://www.springframework.org/schema/aop" 

 xmlns:tx="http://www.springframework.org/schema/tx" 

 xmlns:context="http://www.springframework.org/schema/context" 

 xsi:schemaLocation="http://www.springframework.org/schema/beans 

 http://www.springframework.org/schema/beans/spring-beans-2.5.xsd 
 http://www.springframework.org/schema/tx 

 http://www.springframework.org/schema/tx/spring-tx-2.5.xsd 

 http://www.springframework.org/schema/aop 

 http://www.springframework.org/schema/aop/spring-aop-2.5.xsd 

 http://www.springframework.org/schema/context 

 http://www.springframework.org/schema/context/spring-context-2.5.xsd">

B.加入自动注入

<context:annotation-config/> 

 <context:component-scan base-package="net.shopxx"/>

C.spring组件

@Component("jcaptchaFilter") 

public class JcaptchaFilter implements Filter {

D.引入需要注入的类

public class AdminAction extends ActionSupport { 


 @Autowired 

 @Qualifier("jcaptchaFilter") 

 private JcaptchaFilter jcaptchaFilter;