java SpringMvc中拦截器的应用

public class DemoInterceptor implements HandlerInterceptor {

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

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

    //在视图处理后执行
    @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 {

    //重写配置模板中的拦截器方法
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //创建DemoInterceptor对象，注册到SpringMVC中
        //addPathPatterns()方法到作用是约定拦截器到URL
        //注册一个拦截器，在请求/home/index.do时候执行拦截器到功能
        registry.addInterceptor(new DemoInterceptor()).addPathPatterns("/home/index.do");
    }
}