拦截器

Posted 2021-03-22 tekken-wang

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创建拦截器

1 实现 HandlerInterceptor 创建拦截器

@Component
public class TimeInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        request.setAttribute("startTime", new Date().getTime());
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        Long start = (Long) request.getAttribute("startTime");
        System.out.println("time interceptor 耗时:"+ (new Date().getTime() - start));

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        Long start = (Long) request.getAttribute("startTime");
        System.out.println("time interceptor 耗时:"+ (new Date().getTime() - start));
        System.out.println("ex is "+ex);
    }

}

2 配置类中继承 WebMvcConfigurerAdapter 注册拦截器

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {
    
    @SuppressWarnings("unused")
    @Autowired
    private TimeInterceptor timeInterceptor;
    
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(timeInterceptor);
    }

}