网站服务器是指什么,网站备案期,电子商务网站建设臧良运课后答案,面试网站建设的问题流程#xff1a;从cookie中获取凭证#xff0c;根据凭证查询用户#xff0c;并在本次请求中持有用户#xff0c;在视图模板上显示登录用户的信息。
1. 定义拦截器
package com.nowcoder.community.controller.Interceptor;import com.nowcoder.community.entity.LoginTic…流程从cookie中获取凭证根据凭证查询用户并在本次请求中持有用户在视图模板上显示登录用户的信息。
1. 定义拦截器
package com.nowcoder.community.controller.Interceptor;import com.nowcoder.community.entity.LoginTicket;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CookieUtil;
import com.nowcoder.community.util.HostHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Date;Componentpublic class LoginTicketInterceptor implements HandlerInterceptor {Autowiredprivate UserService userService;Autowiredprivate HostHolder hostHolder;Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {// 从cookie中获取凭证String ticket CookieUtil.getValue(request, ticket);if(ticket ! null){ // 已经登陆LoginTicket loginTicket userService.findLoginTicket(ticket);// 检查ticket是否有效if(loginTicket ! null loginTicket.getExpired().after(new Date()) loginTicket.getStatus()0){// 根据凭证查询用户User user userService.findUserById(loginTicket.getUserId());// 在本次请求中持有用户hostHolder.setUsers(user);}}return true;}// 在模板引擎之前使用user将user放到model里Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {User user hostHolder.getUser();if(user ! null modelAndView ! null){modelAndView.addObject(loginUser,user);}}// 在模板引擎启动后清掉threadlocal防止内存泄露Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {hostHolder.clear();}
}
2. 配置拦截器
package com.nowcoder.community.config;import com.nowcoder.community.controller.Interceptor.AlphaInterceptor;
import com.nowcoder.community.controller.Interceptor.LoginTicketInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;Configurationpublic class WebMvcConfig implements WebMvcConfigurer {Autowiredprivate AlphaInterceptor alphaInterceptor;Autowiredprivate LoginTicketInterceptor loginTicketInterceptor;Overridepublic void addInterceptors(InterceptorRegistry registry) {// 通过重写addInterceptors()方法可以配置拦截器对请求进行预处理或后处理。registry.addInterceptor(alphaInterceptor).excludePathPatterns(/**/*.css, /**/*.js, /**/*.png, /**/*.jpg, /**/*.jpeg).addPathPatterns(/register,/login);registry.addInterceptor(loginTicketInterceptor).excludePathPatterns(/**/*.css, /**/*.js, /**/*.png, /**/*.jpg, /**/*.jpeg);}
}
