package web.servlet.cdc;

import domain.Admin;
import domain.CDC;
import domain.Student;
import domain.Teacher;
import service.CDCService;
import service.StudentService;
import service.impl.CDCServiceImpl;
import service.impl.StudentServiceImpl;

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 javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.List;

@WebServlet("/cdcListServlet")
public class CDCListServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        //调用StudentService完成查询-
        CDCService service = new CDCServiceImpl();
        List<CDC> cdcs = service.findAll();
        //将list存入request域-
        request.setAttribute("cdcs",cdcs);

        // 获取当前会话
        HttpSession session = request.getSession();
        // 从会话中获取学生对象
        Student student= (Student)session.getAttribute("student");
        // 从会话中获取管理员对象
        Admin admin= (Admin)session.getAttribute("admin");
        // 从会话中获取教师对象
        Teacher teacher= (Teacher)session.getAttribute("teacher");

        // 如果会话中存在学生对象，且不存在管理员对象和教师对象，则跳转到学生CDC列表页面
        if (student != null && admin == null && teacher == null) {
            request.getRequestDispatcher("/WEB-INF/student/sCDCList.jsp").forward(request, response);
        // 如果会话中存在管理员对象，且不存在学生对象和教师对象，则跳转到管理员CDC列表页面
        } else if (admin != null && student == null && teacher == null) {
            request.getRequestDispatcher("/WEB-INF/admin/aCDCList.jsp").forward(request, response);
        // 如果会话中存在教师对象，且不存在学生对象和管理员对象，则跳转到教师CDC列表页面
        } else if (teacher != null && admin == null && student == null) {
            request.getRequestDispatcher("/WEB-INF/teacher/tCDCList.jsp").forward(request, response);
        // 如果会话中不存在学生对象、管理员对象和教师对象，则跳转到错误页面
        } else {
            request.getRequestDispatcher("error.jsp").forward(request, response);
        }
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request,response);
    }
}
//package web.servlet.cdc;
//
//import domain.Admin;
//import domain.CDC;
//import domain.Student;
//import domain.Teacher;
//import service.CDCService;
//import service.StudentService;
//import service.impl.CDCServiceImpl;
//import service.impl.StudentServiceImpl;
//
//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 javax.servlet.http.HttpSession;
//import java.io.IOException;
//import java.util.List;
//
//@WebServlet("/cdcListServlet")
//public class CDCListServlet extends HttpServlet {
//    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//        request.setCharacterEncoding("utf-8");
//        //调用StudentService完成查询-
//        CDCService service = new CDCServiceImpl();
//        List<CDC> cdcs = service.findAll();
//        //将list存入request域-
//        request.setAttribute("cdcs",cdcs);
//
//        // 获取当前会话
//        HttpSession session = request.getSession();
//        // 从会话中获取学生对象
//        Student student= (Student)session.getAttribute("student");
//        // 从会话中获取管理员对象
//        Admin admin= (Admin)session.getAttribute("admin");
//        // 从会话中获取教师对象
//        Teacher teacher= (Teacher)session.getAttribute("teacher");
//
//        // 如果会话中存在学生对象，且不存在管理员对象和教师对象，则跳转到学生CDC列表页面
//        if (student != null && admin == null && teacher == null) {
//            request.getRequestDispatcher("/WEB-INF/student/sCDCList.jsp").forward(request, response);
//        // 如果会话中存在管理员对象，且不存在学生对象和教师对象，则跳转到管理员CDC列表页面
//        } else if (admin != null && student == null && teacher == null) {
//            request.getRequestDispatcher("/WEB-INF/admin/aCDCList.jsp").forward(request, response);
//        // 如果会话中存在教师对象，且不存在学生对象和管理员对象，则跳转到教师CDC列表页面
//        } else if (teacher != null && admin == null && student == null) {
//            request.getRequestDispatcher("/WEB-INF/teacher/tCDCList.jsp").forward(request, response);
//        // 如果会话中不存在学生对象、管理员对象和教师对象，则跳转到错误页面
//        } else {
//            request.getRequestDispatcher("error.jsp").forward(request, response);
//        }
//    }
//
//    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//        this.doPost(request,response);
//    }
//}