SpringBoot中在除controller以外注入service-过滤器中注入

一般我们都是在controller层注入service那么如何在过滤器中注入service呢 一般使用过滤器在启动类中添加如下代码

@SpringBootApplication
@MapperScan("com.cmbchina.ccd.itpm.baffle.dao")

public class BaffleApplication extends SpringBootServletInitializer {
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(BaffleApplication.class);
    }

    public static void main(String[] args) {
        SpringApplication.run(BaffleApplication.class, args);
    }
    //配置过滤器
    @Bean
    public FilterRegistrationBean filterRegistrationBean(){
        FilterRegistrationBean filterFilterRegistrationBean = new FilterRegistrationBean(new UrlFilter());
        filterFilterRegistrationBean.addUrlPatterns("/*");
        return filterFilterRegistrationBean;
    }


}

这样的话启动的时候就会加载这个过滤器 要是直接在过滤器中直接@Autowired 会出先空指针的我们可以采用下面的方法

@Component
public class UrlFilter implements Filter {
    @Autowired
    private UrlServicer urlServicer;
   /* private static  Logger logger= LoggerFactory.getLogger(UrlFilter .class);*/
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        ServletContext sc = filterConfig.getServletContext();
        WebApplicationContext cxt = WebApplicationContextUtils.getWebApplicationContext(sc);
        if(cxt != null && cxt.getBean(UrlServicer.class) != null && urlServicer == null) {
            urlServicer =cxt.getBean(UrlServicer.class);
        }
    }

在过滤器加上@Component注解在init方法中初始化你要注入的service就可以了

感谢阅读