text/src/web/servlet/notify/NotifyListToServlet.java

package web.servlet.notify;

import domain.Admin;
import domain.Notify;
import domain.Student;
import domain.Teacher;
import service.NotifyService;
import service.impl.NotifyServiceImpl;

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("/notifyListToServlet")
public class NotifyListToServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        NotifyService service = new NotifyServiceImpl();
        List<Notify> notifys = service.findAll();
        request.setAttribute("notifys",notifys);

        // 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教师对象，则转发到学生通知列表页面
        if (student != null && teacher == null) {
            request.getRequestDispatcher("/WEB-INF/notify/notifyListToStudent.jsp").forward(request,response);
        // 如果会话中存在教师对象且不存在学生对象，则转发到教师通知列表页面
        } else if (teacher != null && student == null) {
            request.getRequestDispatcher("/WEB-INF/notify/notifyListToTeacher.jsp").forward(request,response);
        // 如果会话中既不存在学生对象也不存在教师对象，则转发到错误页面
        } else {
            request.getRequestDispatcher("error.jsp").forward(request, response);
        }

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request,response);
    }
}
//package web.servlet.notify;
//
//import domain.Admin;
//import domain.Notify;
//import domain.Student;
//import domain.Teacher;
//import service.NotifyService;
//import service.impl.NotifyServiceImpl;
//
//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;
///**
// * 转发到通知列表的Servlet
// */
//@WebServlet("/notifyListToServlet")
//public class NotifyListToServlet extends HttpServlet {
//    /**
//     * 处理POST请求，获取所有通知并转发到通知列表页面。
//     *
//     * @param request  HTTP请求对象，包含客户端发送的数据。
//     * @param response HTTP响应对象，用于生成返回给客户端的响应。
//     * @throws ServletException 如果处理请求时发生错误。
//     * @throws IOException      如果输入或输出异常发生。
//     */
//    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//        // 设置请求的字符编码为UTF-8，以支持中文字符的正确处理
//        request.setCharacterEncoding("utf-8");
//        // 创建通知服务的实例，以便获取通知数据
//        NotifyService service = new NotifyServiceImpl();
//        List<Notify> notifys = service.findAll();
//        request.setAttribute("notifys",notifys);
//
//        // 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教师对象，则转发到学生通知列表页面
//        if (student != null && teacher == null) {
//            request.getRequestDispatcher("/WEB-INF/notify/notifyListToStudent.jsp").forward(request,response);
//        // 如果会话中存在教师对象且不存在学生对象，则转发到教师通知列表页面
//        } else if (teacher != null && student == null) {
//            request.getRequestDispatcher("/WEB-INF/notify/notifyListToTeacher.jsp").forward(request,response);
//        // 如果会话中既不存在学生对象也不存在教师对象，则转发到错误页面
//        } else {
//            request.getRequestDispatcher("error.jsp").forward(request, response);
//        }
//
//    }
//
//    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//        doPost(request,response);
//    }
//}