springboot自定义拦截器

自定义拦截器

自定义拦截器有两种方法，继承HandlerInterceptorAdapter和实现HandlerInterceptor接口
本例继承HandlerInterceptorAdapter

@Component
public class MyInterceptor extends HandlerInterceptorAdapter{
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        long startTime = System.currentTimeMillis();
        request.setAttribute("startTime",startTime);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        long startTime = (Long) request.getAttribute("startTime");
        request.removeAttribute("startTime");
        long endTime = System.currentTimeMillis();
        System.out.println(endTime-startTime);
        request.setAttribute("handTime",endTime-startTime);
    }
}

注册拦截器

定义拦截器时，springboot和传统的ssm框架并没有什么不同，传统的ssm框架一般是采用xml的方式注册拦截器，比较麻烦；springboot提倡使用注解，方式如下

@SpringBootConfiguration
public class MyAdapter extends WebMvcConfigurerAdapter{
   /* @Bean
    public MyInterceptor myInterceptor(){
        return new MyInterceptor();
    }*/

    @Autowired
    private MyInterceptor myInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(myInterceptor).addPathPatterns("/**");
    }
}

结果

在浏览器中访问任意路径，控制台会打印处理此请求的时间