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 { @Override public 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; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { // TODO Auto-generated method stub } @Override public 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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