springboot-自定義過濾器

**
 * @Auther: Jhon Li
 * @Date: 2018/12/20 11:51
 * @Description:  過濾器         spring自己的可以用 component註解 來注入,如果是第三方就需要從新 通過 配置類來注入,config中
 *
 * 缺點 :可以拿到http請求的原始信息,但是拿不到真正處理這個請求的方法信息
 */
//@Component        這個註解式全部路徑過濾
public class TimeFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("time filter init");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("time filter start");
        long time = new Date().getTime();
        filterChain.doFilter(servletRequest,servletResponse);
        System.out.println("time filter :"+(new Date().getTime()-time));
        System.out.println("time filter finish");
    }

    @Override
    public void destroy() {
        System.out.println("time filter destroy");
    }
}

也可以在配置類注入

 

/**
 * @Auther: Jhon Li
 * @Date: 2018/12/20 12:04
 * @Description:
 */
@Configuration
public class WebConfig   extends WebMvcConfigurerAdapter{
    @Autowired
    private TimeInterceptor timeInterceptor;

    //添加攔截器到配置中
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
 //       registry.addInterceptor(timeInterceptor);
    }

  //  @Bean
    public FilterRegistrationBean filterRegistrationBean(){
        FilterRegistrationBean filterRegistrationBean=new FilterRegistrationBean();
        TimeFilter timeFilter=new TimeFilter();
        filterRegistrationBean.setFilter(timeFilter);
        List<String> urls=new ArrayList<>();
        urls.add("/**"); //指定那些url 過濾
        filterRegistrationBean.setUrlPatterns(urls);
        return filterRegistrationBean;
    }
}