public class DemoInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("prehandle");
        return true;
    }

    //在控制器之后執(zhí)行
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("posthandle");
    }

    //在視圖處理后執(zhí)行
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterComplete");
    }
}

@Configuration
@ComponentScan("cn.tedu.controller")
//WebMvcConfigurer 是springmvc的配置模板,配合注解一起使用
@EnableWebMvc
public class SpringMvcConfig implements WebMvcConfigurer {

    //重寫配置模板中的攔截器方法
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //創(chuàng)建DemoInterceptor對(duì)象，注冊(cè)到SpringMVC中
        //addPathPatterns()方法到作用是約定攔截器到URL
        //注冊(cè)一個(gè)攔截器，在請(qǐng)求/home/index.do時(shí)候執(zhí)行攔截器到功能
        registry.addInterceptor(new DemoInterceptor()).addPathPatterns("/home/index.do");
    }
}