SpringMVC 拦截器

<!--配置拦截器，可定义多个拦截器-->
<mvc:interceptors>
    <!--定义1个拦截器-->
    <mvc:interceptor>
        <!--用于指定拦截器匹配url-->
        <mvc:mapping path="/user/**"/>
        <!--用于指定拦截器排除的url-->
        <mvc:exclude-mapping path="/"/>
        <!--用来指定拦截器-->
        <bean class="com.tobie.interceptor.MyHandlerInterceptor"/>
    </mvc:interceptor>
</mvc:interceptors>

package com.tobie.interceptor;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author Tobieance
 * @description 自定义拦截器
 * @date 2023-09-14 16:02
 */
public class MyHandlerInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println(this.getClass().getSimpleName()+".preHandler");
        request.setAttribute("msg","<h1>拦截</h1>");
        request.getRequestDispatcher("/WEB-INF/view/result.jsp").forward(request,response);
        //返回值为true表示通过（默认），false表示拦截
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println(this.getClass().getSimpleName()+".postHandler");

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println(this.getClass().getSimpleName()+".afterCompletion");
    }
}