Java Web的简单登录应用

package com.xxxx.controller; import com.xxxx.entity.LotteryRecord; import com.xxxx.service.LotteryRecordService; import com.xxxx.mapper.LotteryMapperImpl; import com.xxxx.mapper.LotteryRecordMapper; import com.xxxx.util.MyBatisUtil; import org.apache.ibatis.session.SqlSessionFactory; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.util.List; @WebServlet("/center") public class LotteryRecordServlet extends HttpServlet { public static int userId; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // 获取 SqlSessionFactory 实例 SqlSessionFactory sqlSessionFactory = MyBatisUtil.getSqlSessionFactory(); int userId = Integer.parseInt(req.getParameter("userId")); // 创建 LotteryRecordMapperImpl 实例 LotteryRecordMapper mapper = new LotteryMapperImpl(sqlSessionFactory); // 创建 LotteryRecordService 实例 LotteryRecordService service = new LotteryRecordService(mapper); // 获取中奖记录 List<LotteryRecord> records = service.getLotteryRecordsByUserId(userId); // 将记录添加到请求属性 req.setAttribute("lotteryRecords", records); // 转发到 JSP 页面 RequestDispatcher dispatcher = req.getRequestDispatcher("/center.jsp"); dispatcher.forward(req, resp); } }