【Spring】解决Filter不能注入Spring bean的问题

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我们都知道Filter的优先级大于Servlet，而springMVC又是基于Servlet来进行注入bean的，所以这就导致了Filter无法注入bean

接下来我们进行配置Filter:

web.xml

<filter>
  	<filter-name>loginFilter</filter-name>
  	<filter-class>com.ipp.filter.LoginFilter</filter-class>
  </filter>
  <filter-mapping>
  	<filter-name>loginFilter</filter-name>
  	<url-pattern>/loanref/*</url-pattern>
  </filter-mapping>

在LoginFilter中继续进行注入

接下来编写一个SpringUtils进行手动注入bean

/**  
 * @author yqb  
 * @date 2018年9月29日  
 * @version 1.0  
 */
@Component
public class SpringUtils implements ApplicationContextAware{
	private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {
        if (SpringUtils.applicationContext == null) {
            SpringUtils.applicationContext = applicationContext;
        }

    }

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    //根据name
    public static Object getBean(String name) {
        return getApplicationContext().getBean(name);
    }

    //根据类型
    public static <T> T getBean(Class<T> clazz) {
        return getApplicationContext().getBean(clazz);
    }

    public static <T> T getBean(String name, Class<T> clazz) {
        return getApplicationContext().getBean(name, clazz);
    }

}

接着在init方法中将userService的bean通过SpringUtils给注入进来

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