（转）Springboot 中filter 注入对象

Posted 2020-10-05 人艰不拆_zmc

问题：我建立一个全局拦截器，当然，这是测试的时候建立的，我把它命名为LogFilter，它继承了Filter，web应用启动的顺序是：listener->filter->servlet，而因为项目应用了springboot，所以我们项目启动时，先初始化listener，因此注解的bean会被初始化和注入；然后再来就filter的初始化，再接着才到我们的dispathServlet的初始化，因此，当我们需要在filter里注入一个注解的bean时，就会注入失败，因为filter初始化时，注解的bean还没初始化，没法注入。

那么，解决方法如下：

public FilterRegistrationBean filterProxy(){
   FilterRegistrationBean registrationBean = new FilterRegistrationBean();
   DelegatingFilterProxy httpBasicFilter = new DelegatingFilterProxy();
   registrationBean.setFilter(httpBasicFilter);
   Map<String,String> m = new HashMap<String,String>();
   m.put("targetBeanName","logFilter");
   m.put("targetFilterLifecycle","true");
   registrationBean.setInitParameters(m);
   List<String> urlPatterns = new ArrayList<String>();
   urlPatterns.add("/*");
   registrationBean.setUrlPatterns(urlPatterns);
   return registrationBean;
}

这样你就可以在LogFilter里面添加@Autowired下的bean了。 

public class LogFilter implements Filter {
    @Autowired
    @Qualifier(value="rztRabbitTemplate")
    private RabbitTemplate rabbitTemplate;

@Bean
    public FilterRegistrationBean securityFilter() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new DelegatingFilterProxy("SecurityFilter"));
        registration.addInitParameter("targetFilterLifecycle", "true");
        registration.addUrlPatterns("/*");
        registration.setOrder(102);
        return registration;
    }
    
    @Bean(name = "SecurityFilter")
    public SecurityFilter getSecurityFilter(){
        return new SecurityFilter();
    }

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转自：http://blog.csdn.net/u013030980/article/details/55270818#comments