SpringMVC拦截器

拦截器

拦截器是SpringMVC框架自己的，只有使用了SpringMVC框架的工程才能使用

拦截器只会拦截访问的控制器方法， 如果访问的是jsp/html/css/image/js是不会进行拦截的

package com.yy.interCeptor;

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

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

public class MyInterCeptor implements HandlerInterceptor {

    //return true 执行下一个拦截器：放行
    //return false 不放行
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("==================处理前======================");
        return true;
    }

    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("==================处理后======================");

    }

    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("==================清理======================");

    }
}

配置：

    <!--拦截器配置-->
    <mvc:interceptors>
        <mvc:interceptor>
            <!--拦截所有请求-->
            <mvc:mapping path="/**"/>
            <bean class="com.yy.interCeptor.MyInterCeptor"></bean>
        </mvc:interceptor>
    </mvc:interceptors>