student-management/src/main/java/com/student/servlet/admin/AttendanceStatsServlet.java

package com.student.servlet.admin;



import com.student.bean.AttendanceStats;

import com.student.bean.Course;

import com.student.service.AttendanceService;

import com.student.service.CourseService;

import com.student.servlet.BaseServlet;

import com.student.util.ParamUtil;



import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.util.List;



/**

 * 管理员 - 考勤统计

 */

@WebServlet("/admin/attendanceStats")

public class AttendanceStatsServlet extends BaseServlet {



    private final AttendanceService attendanceService = new AttendanceService();

    private final CourseService courseService = new CourseService();



    @Override

    protected void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        int courseId = ParamUtil.getInt(request, "courseId", 0);

        List<Course> courseList = courseService.findAll();

        request.setAttribute("courseList", courseList);

        AttendanceStats stats = new AttendanceStats();

        if (courseId > 0) {

            request.setAttribute("courseId", courseId);

            stats = attendanceService.getStatsByCourse(courseId);

        }

        request.setAttribute("stats", stats);

        request.getRequestDispatcher("/admin/attendance_stats.jsp").forward(request, response);

    }

}