mvc 拦截器 类似javaweb中的过滤器

1 创建拦截器类实现HandlerInterceptor接口

package com.jc.interceptor;

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

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

//拦截器 1创建拦截器类来实现 HanlderInterceptor
public class MyHandleInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//方法将在请求处理之前进行调用，
        System.out.println("拦截器成功");

        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
//   该方法是在当前请求进行处理之后被调用
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
//   该方法将在整个请求结束之后 执行
   }
}

2 配置拦截器

<!--配置拦截器-->
<mvc:interceptors>
<mvc:interceptor>
<!--对哪些资源执行拦截操作-->
<mvc:mapping path="/**"/>
<bean class="com.itheima.interceptor.MyInterceptor2"/>
</mvc:interceptor>
<mvc:interceptor>
<!--对哪些资源执行拦截操作-->
<mvc:mapping path="/**"/>
<bean class="com.itheima.interceptor.MyInterceptor1"/>
</mvc:interceptor>
</mvc:interceptors>