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);
    }
}