fifter、servlet、interceptor

fifter用來處理請求頭、請求參數(shù)、編碼的一些設(shè)置，然后轉(zhuǎn)交給servlet，處理業(yè)務(wù)，返回

servlet現(xiàn)在常用的spring,servlet攔截/到DispatcherServlet，交由spring管理

interceptor,servlet請求之后可以實(shí)現(xiàn)HandlerInterceptor做到preHandle、postHandle、afterCompletion在controller之前、之后、渲染之后

登陸

業(yè)務(wù)中常用的登陸、注冊，大部分用cookie、session來做，這時候就涉及到攔截判斷用戶是否登陸、是否有權(quán)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代碼如上,然后在servlet.xml中配置如下：

<!-- 攔截器 --> <!-- 多個攔截器，順序執(zhí)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攔截的path地址,mvc:exclude-mapping不攔截的path地址，比如一些登陸、注冊、驗(yàn)證碼、和可以不登錄操作的接口。

至此結(jié)束。

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