Spring interceptor拦截器配置及用法解析

fifter、servlet、interceptor

fifter用来处理请求头、请求参数、编码的一些设置，然后转交给servlet，处理业务，返回

servlet现在常用的spring,servlet拦截/到DispatcherServlet，交由spring管理

interceptor,servlet请求之后可以实现HandlerInterceptor做到preHandle、postHandle、afterCompletion在controller之前、之后、渲染之后

登陆

业务中常用的登陆、注册，大部分用cookie、session来做，这时候就涉及到拦截判断用户是否登陆、是否有权限？至此引出interceptor：

package com.bs.interceptor;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import com.bs.controller.BaseController;import com.bs.entity.Member;public class LoginInterceptor implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)throws Exception {Member member = BaseController.getMemberByCookie(request);System.out.println(member);if(member == null){response.sendRedirect('/officialweb/login.html'); }return false;}@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,ModelAndView modelAndView) throws Exception {// TODO Auto-generated method stub}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)throws Exception {// TODO Auto-generated method stub}}

java代码如上,然后在servlet.xml中配置如下：

<!-- 拦截器 --> <!-- 多个拦截器，顺序执行 --> <mvc:interceptors> <mvc:interceptor> <mvc:mapping path='/**'/> <mvc:exclude-mapping path='/**/cloud/**' /> <mvc:exclude-mapping path='/**/login/**' /> <bean class='com.bs.interceptor.LoginInterceptor'></bean> </mvc:interceptor> </mvc:interceptors>

mvc:mapping拦截的path地址,mvc:exclude-mapping不拦截的path地址，比如一些登陆、注册、验证码、和可以不登录操作的接口。

至此结束。

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