SpringMVC --- 拦截器 HandlerInterceptor

1.  springmvc.xml 设置拦截器

  <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/*"/>
            <bean class="com.xing.intercep.IntercepterDemo"></bean>
        </mvc:interceptor>
    </mvc:interceptors>

2. Class AccountMapper implements HandlerInterceptor @Override pre post after

package com.xing.intercep;

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

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

public class IntercepterDemo implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("控制拦截器执行前");
        return true;

    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("控制拦截器执行后");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("视图解析后");
    }
}