Spring拦截器使用

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1.写一个类实现HandlerInterceptor接口

package com.spring.intercepter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;public class LoginIntercepter implements HandlerInterceptor {    public void afterCompletion(HttpServletRequest arg0,            HttpServletResponse arg1, Object arg2, Exception arg3)            throws Exception {        System.out.println("afterCompletion");    }    public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,            Object arg2, ModelAndView arg3) throws Exception {        System.out.println("postHandle");        //可以通过ModelAndView参数来改变显示的视图,或修改发往视图的方法        arg3.setViewName("home");        arg3.addObject("msg", "这是返回的数据！");    }    /*     * 返回值      * true 请求继续     * false 请求终止     * arg2 被拦截的请求的目标对象     */    public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1,            Object arg2) throws Exception {        System.out.println("preHandle");        //为请求设置编码        arg0.setCharacterEncoding("utf-8");        //对用户是否登录进行判断        if(arg0.getSession().getAttribute("user") == null){            arg0.getRequestDispatcher("login.jsp").forward(arg0, arg1);            return false;        }        return true;    }}

2。在spring配置文件注册

<mvc:interceptors>    <mvc:interceptor>        <mvc:mapping path="/**"></mvc:mapping>        <bean class="com.spring.intercepter.LoginIntercepter"</bean>    </mvc:interceptor></mvc:interceptors>

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