diff --git a/app_function.py b/app_function.py
new file mode 100644
index 0000000..8237055
--- /dev/null
+++ b/app_function.py
@@ -0,0 +1,924 @@
+from flask import Flask, request, jsonify, redirect, url_for, render_template, session, make_response, flash
+from flask_mail import Mail, Message
+from flask_bcrypt import Bcrypt
+import mysql.connector
+import boto3
+from botocore.client import Config
+import os
+import logging
+import random
+import pandas as pd
+from dotenv import load_dotenv
+from flask import send_file
+import io
+from functools import wraps
+import tempfile
+import shutil
+import zipfile
+import time
+from urllib.parse import quote
+
+load_dotenv()
+bcrypt = Bcrypt()
+
+# 配置 AWS S3
+aws_access_key_id = os.getenv('AWS_ACCESS_KEY_ID')
+aws_secret_access_key = os.getenv('AWS_SECRET_ACCESS_KEY')
+region_name = os.getenv('AWS_REGION')
+bucket_name = os.getenv('S3_BUCKET_NAME')
+s3_client = boto3.client(
+    's3',
+    aws_access_key_id=aws_access_key_id,
+    aws_secret_access_key=aws_secret_access_key,
+    region_name=region_name,
+    config=Config(signature_version='s3v4')
+)
+
+# 下载相关
+def download_and_zip_files(bucket_name, folder_key):
+    """下载文件并进行支持 ZIP64 的压缩打包"""
+    temp_dir = tempfile.mkdtemp()  # 创建一个临时目录
+    zip_file_path = os.path.join(temp_dir, 'homework.zip')
+
+    try:
+        # 列出文件
+        file_keys = list_files_in_folder(bucket_name, folder_key)
+
+        if not file_keys:
+            logging.error(f"No files found in folder: {folder_key}")
+            return None
+
+        # 下载文件
+        for file_key in file_keys:
+            file_name = os.path.basename(file_key)
+            file_download_path = os.path.join(temp_dir, file_name)
+
+            # 下载文件
+            logging.info(f"Downloading {file_key} to {file_download_path}")
+            s3_client.download_file(bucket_name, file_key, file_download_path)
+        
+        # ZIP 压缩过程
+        with zipfile.ZipFile(zip_file_path, 'w', zipfile.ZIP_DEFLATED, allowZip64=True) as zipf:
+            for root, _, files in os.walk(temp_dir):
+                for file in files:
+                    file_path = os.path.join(root, file)
+
+                    # 排除自身的 ZIP 文件，防止自我压缩
+                    if file == os.path.basename(zip_file_path):
+                        logging.info(f"Skipping self zip file: {file}")
+                        continue
+                    
+                    # 打包其它文件
+                    arcname = os.path.relpath(file_path, start=temp_dir)
+                    logging.info(f"Adding {file} to archive as {arcname}")
+                    zipf.write(file_path, arcname=arcname)
+
+        logging.info(f"Zip file created at {zip_file_path}")
+        return zip_file_path  # 返回 ZIP 文件路径
+
+    except Exception as e:
+        logging.error(f"Error during download or zip operation: {e}")
+        return None
+
+
+def upload_zip_to_s3(zip_file_path, bucket_name, object_key):
+    """上传压缩包文件到S3"""
+    try:
+        s3_client.upload_file(zip_file_path, bucket_name, object_key)
+    except ClientError as e:
+        logging.error(f"Error uploading zip to S3: {e}")
+        return None
+
+    return generate_presigned_download_url(bucket_name, object_key)
+
+# 列出文件
+def list_files_in_folder(bucket_name, folder_key):
+    try:
+        response = s3_client.list_objects_v2(Bucket=bucket_name, Prefix=folder_key)
+        if 'Contents' not in response:
+            logging.error(f"No contents found in S3 folder {folder_key}")
+            return []
+        
+        files = [obj['Key'] for obj in response['Contents'] if obj['Key'] != folder_key]
+        logging.info(f"Files in folder {folder_key}: {files}")
+        return files
+    
+    except ClientError as e:
+        logging.error(f"Error listing files in folder {folder_key}: {e}")
+        return []
+
+# 数据库连接函数
+def get_db_connection():
+    return mysql.connector.connect(
+        host=os.getenv('MYSQL_HOST'),
+        user=os.getenv('MYSQL_USER'),
+        password=os.getenv('MYSQL_PASSWORD'),
+        database=os.getenv('MYSQL_DB')
+    )
+
+# 验证学生身份
+def validate_student(student_id, password, bcrypt):
+    conn = get_db_connection()
+    cursor = conn.cursor(dictionary=True)
+    cursor.execute('SELECT * FROM students WHERE id = %s', (student_id,))
+    student = cursor.fetchone()
+    cursor.close()
+    conn.close()
+    if student and bcrypt.check_password_hash(student['password'], password):
+        return student
+    return None
+
+# 验证管理员身份
+def validate_admin(username, password):
+    conn = get_db_connection()
+    cursor = conn.cursor(dictionary=True)
+    cursor.execute('SELECT * FROM administrators WHERE username = %s', (username,))
+    admin = cursor.fetchone()
+    cursor.close()
+    conn.close()
+
+    if admin and bcrypt.check_password_hash(admin['password'], password):
+        return admin
+    return None
+
+# 验证教师身份
+def validate_teacher(email, password, bcrypt):
+    conn = get_db_connection()  # 或者其他方法来获取数据库连接
+    cursor = conn.cursor(dictionary=True)
+    cursor.execute('SELECT * FROM teachers WHERE email = %s', (email,))
+    teacher = cursor.fetchone()
+    cursor.close()
+    conn.close()
+
+    if teacher and bcrypt.check_password_hash(teacher['password'], password):
+        return teacher
+    return None
+
+def fetch_all_departments():
+    conn = get_db_connection()
+    cursor = conn.cursor(dictionary=True)
+    cursor.execute('SELECT * FROM departments')
+    departments = cursor.fetchall()
+    cursor.close()
+    conn.close()
+    return departments
+
+def fetch_all_grades():
+    conn = get_db_connection()
+    cursor = conn.cursor(dictionary=True)
+    cursor.execute('SELECT * FROM grades')
+    grades = cursor.fetchall()
+    cursor.close()
+    conn.close()
+    return grades
+
+def fetch_all_classes():
+    conn = get_db_connection()
+    cursor = conn.cursor(dictionary=True)
+    cursor.execute('SELECT * FROM classes')
+    classes = cursor.fetchall()
+    cursor.close()
+    conn.close()
+    return classes
+
+def fetch_all_teachers():
+    conn = get_db_connection()
+    cursor = conn.cursor(dictionary=True)
+    cursor.execute('SELECT * FROM teachers')
+    teachers = cursor.fetchall()
+    cursor.close()
+    conn.close()
+    return teachers
+
+def fetch_teacher_classes(teacher_id):
+    conn = get_db_connection()
+    cursor = conn.cursor(dictionary=True)
+
+    # 假设每个教师和班级的关联存储在一个中间表 `class_teacher` 中
+    cursor.execute('''
+        SELECT c.id, c.name FROM classes c
+        JOIN class_teacher ct ON c.id = ct.class_id
+        WHERE ct.teacher_id = %s
+    ''', (teacher_id,))
+
+    classes = cursor.fetchall()
+
+    cursor.close()
+    conn.close()
+    return classes
+
+def fetch_class_assignments(class_id):
+    conn = get_db_connection()
+    cursor = conn.cursor(dictionary=True)
+    pivot_query = '''
+        SELECT * FROM assignments
+        WHERE class_id = %s
+    '''
+    cursor.execute(pivot_query, (class_id,))
+    assignments = cursor.fetchall()
+    cursor.close()
+    conn.close()
+    return assignments
+
+
+def fetch_class_students(class_id):
+    conn = get_db_connection()
+    cursor = conn.cursor(dictionary=True)
+
+    # 查询属于给定class_id的所有学生
+    cursor.execute('''
+        SELECT * FROM students
+        WHERE class_id = %s
+    ''', (class_id,))
+
+    students = cursor.fetchall()
+
+    cursor.close()
+    conn.close()
+    return students
+
+
+# 添加到提交历史表
+def add_to_submission_history(student_id, assignment_id, filename):
+    conn = get_db_connection()
+    cursor = conn.cursor()
+    cursor.execute(
+        'INSERT INTO submission_history (student_id, assignment_id, filename, submit_date) VALUES (%s, %s, %s, NOW())',
+        (student_id, assignment_id, filename)
+    )
+    conn.commit()
+    cursor.close()
+    conn.close()
+
+# 添加或更新作业提交记录
+def add_or_update_submission(student_id, assignment_id, filename, code_verified=False):
+    add_to_submission_history(student_id, assignment_id, filename)  # 保留历史记录
+
+    conn = get_db_connection()
+    cursor = conn.cursor()
+    if code_verified:
+        cursor.execute(
+            'UPDATE submissions SET submit_date = NOW(), filename = %s WHERE student_id = %s AND assignment_id = %s',
+            (filename, student_id, assignment_id))
+    else:
+        cursor.execute(
+            'INSERT INTO submissions (student_id, assignment_id, filename, submit_date) VALUES (%s, %s, %s, NOW())',
+            (student_id, assignment_id, filename))
+    conn.commit()
+    cursor.close()
+    conn.close()
+
+# 生成预签名URL
+def generate_presigned_url(object_key, content_type, expiration=3600):
+    try:
+        url = s3_client.generate_presigned_url(
+            'put_object',
+            Params={'Bucket': bucket_name, 'Key': object_key, 'ContentType': content_type},
+            ExpiresIn=expiration
+        )
+        return url
+    except Exception as e:
+        logging.error(f"Failed to generate presigned URL: {str(e)}")
+        return None
+
+# 添加管理员路由
+def add_admin_routes(app, mail, bcrypt):
+    # 管理员登录装饰器
+    def admin_required(f):
+        @wraps(f)
+        def decorated_function(*args, **kwargs):
+            if 'admin_id' not in session:
+                return redirect(url_for('admin_login'))
+            return f(*args, **kwargs)
+        return decorated_function
+
+    @app.route('/admin/add_department', methods=['POST'])
+    @admin_required
+    def add_department():
+        name = request.form['name']
+        conn = get_db_connection()
+        cursor = conn.cursor()
+        cursor.execute('INSERT INTO departments (name) VALUES (%s)', (name,))
+        conn.commit()
+        cursor.close()
+        conn.close()
+        flash('Department added successfully', 'success')
+        return redirect(url_for('admin_panel'))
+
+    @app.route('/admin/add_grade', methods=['POST'])
+    @admin_required
+    def add_grade():
+        year = request.form['year']
+        conn = get_db_connection()
+        cursor = conn.cursor()
+        cursor.execute('INSERT INTO grades (year) VALUES (%s)', (year,))
+        conn.commit()
+        cursor.close()
+        conn.close()
+        flash('Grade added successfully', 'success')
+        return redirect(url_for('admin_panel'))
+
+    @app.route('/admin/add_class', methods=['POST'])
+    @admin_required
+    def add_class():
+        name = request.form['name']
+        department_id = request.form['department_id']
+        grade_id = request.form['grade_id']
+        conn = get_db_connection()
+        cursor = conn.cursor()
+        cursor.execute('INSERT INTO classes (name, department_id, grade_id) VALUES (%s, %s, %s)',
+                       (name, department_id, grade_id))
+        conn.commit()
+        cursor.close()
+        conn.close()
+        flash('Class added successfully', 'success')
+        return redirect(url_for('admin_panel'))
+
+    @app.route('/admin/add_teacher', methods=['POST'])
+    @admin_required
+    def add_teacher():
+        name = request.form['name']
+        email = request.form['email']
+        password = bcrypt.generate_password_hash(request.form['password']).decode('utf-8')
+        conn = get_db_connection()
+        cursor = conn.cursor()
+        cursor.execute('INSERT INTO teachers (name, email, password) VALUES (%s, %s, %s)',
+                       (name, email, password))
+        conn.commit()
+        cursor.close()
+        conn.close()
+        flash('Teacher added successfully', 'success')
+        return redirect(url_for('admin_panel'))
+
+    @app.route('/admin/add_administrator', methods=['POST'])
+    @admin_required
+    def add_administrator():
+        username = request.form['username']
+        password = bcrypt.generate_password_hash(request.form['password']).decode('utf-8')
+        teacher_id = request.form['teacher_id']
+        conn = get_db_connection()
+        cursor = conn.cursor()
+        cursor.execute('INSERT INTO administrators (username, password, teacher_id) VALUES (%s, %s, %s)',
+                       (username, password, teacher_id))
+        conn.commit()
+        cursor.close()
+        conn.close()
+        flash('Administrator added successfully', 'success')
+        return redirect(url_for('admin_panel'))
+
+    @app.route('/admin/assign_teacher', methods=['POST'])
+    @admin_required
+    def assign_teacher():
+        class_id = request.form['class_id']
+        teacher_id = request.form['teacher_id']
+        conn = get_db_connection()
+        cursor = conn.cursor()
+        cursor.execute('INSERT INTO class_teacher (class_id, teacher_id) VALUES (%s, %s)', (class_id, teacher_id))
+        conn.commit()
+        cursor.close()
+        conn.close()
+        flash('Teacher assigned to class successfully', 'success')
+        return redirect(url_for('admin_panel'))
+
+    @app.route('/admin/login', methods=['GET', 'POST'])
+    def admin_login():
+        if request.method == 'POST':
+            username = request.form['username']
+            password = request.form['password']
+            admin = validate_admin(username, password)
+            if admin:
+                session['admin_id'] = admin['id']
+                return redirect(url_for('admin_panel'))
+            else:
+                flash('Invalid credentials', 'error')
+        return render_template('admin_login.html')
+
+    @app.route('/admin/logout')
+    def admin_logout():
+        session.pop('admin_id', None)
+        return redirect(url_for('admin_login'))
+
+    @app.route('/admin/panel')
+    @admin_required
+    def admin_panel():
+        # Retrieve necessary data (e.g., departments, grades, classes, etc.)
+        departments = fetch_all_departments()
+        grades = fetch_all_grades()
+        classes = fetch_all_classes()
+        teachers = fetch_all_teachers()
+        return render_template('admin_panel.html', departments=departments, grades=grades, classes=classes, teachers=teachers)
+
+    @app.route('/admin/add_assignment', methods=['POST'])
+    @admin_required
+    def admin_add_assignment():
+        value = request.form['value']
+        name = request.form['name']
+        deadline = request.form['deadline']
+        conn = get_db_connection()
+        cursor = conn.cursor()
+        cursor.execute('INSERT INTO assignments (value, name, deadline) VALUES (%s, %s, %s)', (value, name, deadline))
+        conn.commit()
+        cursor.close()
+        conn.close()
+        flash('Assignment added successfully', 'success')
+        return redirect(url_for('admin_panel'))
+
+    @app.route('/login', methods=['GET', 'POST'])
+    def login():
+        if request.method == 'POST':
+            student_id = request.form.get('student_id')
+            password = request.form.get('password')
+            student = validate_student(student_id, password, bcrypt)
+            if student:
+                session['student_id'] = student['id']
+                session['student_name'] = student['name']
+                return redirect(url_for('serve_index'))
+            else:
+                return render_template('login.html', error='学号或密码错误')
+        return render_template('login.html')
+
+    @app.route('/reset-password', methods=['GET', 'POST'])
+    def reset_password():
+        if request.method == 'POST':
+            student_id = request.form.get('student_id')
+            email = request.form.get('email')
+            code = request.form.get('code')
+            new_password = request.form.get('new_password')
+            if code:
+                if session.get('reset_code') == code and session.get('reset_student_id') == student_id:
+                    conn = get_db_connection()
+                    cursor = conn.cursor()
+                    hashed_password = bcrypt.generate_password_hash(new_password).decode('utf-8')
+                    cursor.execute('UPDATE students SET password = %s WHERE id = %s', (hashed_password, student_id))
+                    conn.commit()
+                    cursor.close()
+                    conn.close()
+                    return render_template('login.html', success='密码已成功重置，请使用新密码登录')
+                else:
+                    return render_template('reset_password.html', error='验证码错误')
+            else:
+                conn = get_db_connection()
+                cursor = conn.cursor(dictionary=True)
+                cursor.execute('SELECT * FROM students WHERE id = %s AND email = %s', (student_id, email))
+                student = cursor.fetchone()
+                cursor.close()
+                conn.close()
+                if student:
+                    reset_code = ''.join(random.choices('0123456789', k=6))
+                    session['reset_code'] = reset_code
+                    session['reset_student_id'] = student_id
+                    try:
+                        msg = Message('重置密码验证码', recipients=[email])
+                        msg.body = f'您用于重置密码的验证码是: {reset_code}'
+                        mail.send(msg)
+                        return render_template('reset_password.html',
+                                               success='验证码已发送到您的邮箱，请检查并输入验证码')
+                    except Exception as e:
+                        logging.error(f"Error sending email: {str(e)}")
+                        return render_template('reset_password.html', error='发送验证码失败，请稍后再试')
+                else:
+                    return render_template('reset_password.html', error='学号和邮箱不匹配')
+        return render_template('reset_password.html')
+
+    @app.route('/record-submission', methods=['POST'])
+    def record_submission():
+        data = request.json
+        student_id = session.get('student_id')
+        student_name = session.get('student_name')
+        assignment = data.get('assignment')
+        filename = data.get('filename')  # 通过前端传递的文件名获取
+
+        if not student_id or not filename or not assignment:
+            return jsonify({'error': '学号、作业和文件名是必要参数'}), 400
+
+        conn = get_db_connection()
+        cursor = conn.cursor(dictionary=True)
+        cursor.execute('SELECT * FROM submissions WHERE student_id = %s AND assignment_id = %s',
+                       (student_id, assignment))
+        submission = cursor.fetchone()  # 检查该学生是否已提交过此作业
+
+        cursor.close()
+        conn.close()
+
+        if submission:
+            session['filename'] = filename  # 保留新文件名以备`validate-code`使用
+            return jsonify({'error': '作业已提交过，请输入验证码继续'}), 401  # 提示用户输入验证码以覆盖提交
+
+        # 提取当前上传文件的扩展名
+        _, file_extension = os.path.splitext(filename)  # 通过前端传递的文件提取扩展名
+
+        # 生成新的文件名，并确保文件扩展名保持正确
+        new_filename = f'{student_id}_{student_name}_{assignment}{file_extension}'
+        folder_name = f'sure_homework_define_by_qin/{assignment}'
+        object_key = f'{folder_name}/{new_filename}'
+
+        # 生成预签名 URL
+        url = generate_presigned_url(object_key, 'application/octet-stream')
+
+        if not url:
+            logging.error("Failed to generate presigned URL")
+            return jsonify({'error': '无法生成预签名 URL'}), 500
+
+        # 保存提交记录
+        add_or_update_submission(student_id, assignment, new_filename, code_verified=False)
+
+        return jsonify({'status': 'success', 'upload_url': url})
+
+    @app.route('/generate-code', methods=['POST'])
+    def generate_code():
+        student_id = session.get('student_id')
+        assignment = request.json.get('assignment')
+
+        conn = get_db_connection()
+        cursor = conn.cursor(dictionary=True)
+        cursor.execute('SELECT email FROM students WHERE id = %s', (student_id,))
+        student = cursor.fetchone()
+        cursor.close()
+        conn.close()
+
+        if not student:
+            return jsonify({'error': '学生信息未找到'}), 404
+
+        email = student['email']
+        reset_code = ''.join(random.choices('0123456789', k=6))
+        session['submission_code'] = reset_code
+        session['submission_student_id'] = student_id
+        session['submission_assignment'] = assignment
+
+        try:
+            msg = Message('提交作业验证码', recipients=[email])
+            msg.body = f'您用于提交作业的验证码是: {reset_code}'
+            mail.send(msg)
+            return jsonify({'status': '验证码已发送到您的邮箱，请检查并输入验证码'})
+        except Exception as e:
+            logging.error(f"Error sending email: {str(e)}")
+            return jsonify({'error': '发送验证码失败，请稍后再试'}), 500
+
+    @app.route('/validate-code', methods=['POST'])
+    def validate_code():
+        request_data = request.json
+        student_id = session.get('student_id')
+        assignment = request_data.get('assignment')
+        code = request_data.get('code')
+
+        # 验证提交的验证码与 session 中的值是否匹配
+        if (code == session.get('submission_code') and
+                student_id == session.get('submission_student_id') and
+                assignment == session.get('submission_assignment')):
+
+            # 从 session 中获取新文件名
+            filename = session.pop('filename', None)
+
+            if not filename:
+                return jsonify({'error': 'No file was found in session'}), 400
+
+            # 提取文件扩展名
+            _, file_extension = os.path.splitext(filename)  # 获取文件的后缀名
+
+            # 使用学号、学生名、作业名生成文件名（不含后缀）
+            new_filename = f'{student_id}_{session.get("student_name")}_{assignment}{file_extension}'
+            folder_name = f'sure_homework_define_by_qin/{assignment}'
+
+            # 生成对象键前缀（不含扩展名），用于查找已存在的文件
+            object_key_prefix = f'{folder_name}/{student_id}_{session.get("student_name")}_{assignment}'
+
+            # 删除已存在的文件（任何扩展名）
+            delete_old_files_in_s3(object_key_prefix)
+
+            # 再生成新的对象键（含有扩展名）
+            object_key = f'{object_key_prefix}{file_extension}'
+
+            logging.info(f"Generated object_key: {object_key}")
+
+            # 生成预签名 URL
+            url = generate_presigned_url(object_key, 'application/octet-stream')
+
+            if not url:
+                logging.error("Failed to generate presigned URL")
+                return jsonify({'error': 'Failed to generate presigned URL'}), 500
+
+            # 更新数据库记录
+            add_or_update_submission(student_id, assignment, new_filename, code_verified=True)
+
+            # 清除 session 中的验证码和作业信息
+            session.pop('submission_code', None)
+            session.pop('submission_student_id', None)
+            session.pop('submission_assignment', None)
+
+            session['validated_assignment'] = assignment
+            session['validation_presigned_url'] = url
+
+            return jsonify({'status': '成功', 'upload_url': url})
+        else:
+            return jsonify({'error': '验证码错误'}), 400
+
+    # 辅助函数：删除 S3 存储桶中具有指定前缀的旧文件（无论扩展名是何）
+    def delete_old_files_in_s3(object_key_prefix):
+        # 查找存储桶中是否已经存在具有相同前缀（不同后缀）的文件
+        response = s3_client.list_objects_v2(Bucket=bucket_name, Prefix=object_key_prefix)
+
+        if 'Contents' in response:
+            for obj in response['Contents']:
+                s3_client.delete_object(Bucket=bucket_name, Key=obj['Key'])
+                logging.info(f"Deleted old file from S3: {obj['Key']}")
+
+    @app.route('/api/submissions')
+    def get_submissions():
+        try:
+            conn = get_db_connection()
+            cursor = conn.cursor(dictionary=True)
+            cursor.execute("""
+                SELECT 
+                    sh.submit_date AS 时间, 
+                    sh.filename AS 提交的文件, 
+                    s.name AS 姓名, 
+                    s.id AS 学号, 
+                    sh.assignment_id AS 作业
+                FROM submission_history sh
+                JOIN students s ON sh.student_id = s.id
+                ORDER BY sh.submit_date DESC
+            """)
+            submissions = cursor.fetchall()
+            cursor.close()
+            conn.close()
+
+            # 格式化日期时间
+            for sub in submissions:
+                sub['时间'] = sub['时间'].strftime('%Y-%m-%d %H:%M:%S') if sub['时间'] else None
+
+            return jsonify(submissions)
+        except Exception as e:
+            logging.error(f"Error in get_submissions: {str(e)}", exc_info=True)
+            return jsonify({'error': str(e)}), 500
+
+    @app.route('/api/assignment-status')
+    def get_assignment_status():
+        try:
+            conn = get_db_connection()
+            cursor = conn.cursor(dictionary=True)
+            cursor.execute("""
+                SELECT 
+                    s.id AS 学号, 
+                    s.name AS 姓名,
+                    a.assignment_id AS 作业,
+                    CASE WHEN sub.id IS NOT NULL THEN '已提交' ELSE '未提交' END AS 提交情况,
+                    COALESCE(sub.filename, '') AS 提交的文件
+                FROM students s
+                CROSS JOIN (SELECT DISTINCT assignment_id FROM submissions) a
+                LEFT JOIN submissions sub ON s.id = sub.student_id AND a.assignment_id = sub.assignment_id
+                ORDER BY s.id, a.assignment_id
+            """)
+            status_data = cursor.fetchall()
+            cursor.close()
+            conn.close()
+
+            return jsonify(status_data)
+        except Exception as e:
+            logging.error(f"Error in get_assignment_status: {str(e)}", exc_info=True)
+            return jsonify({'error': str(e)}), 500
+
+    @app.route('/download-submissions')
+    def download_submissions():
+        try:
+            conn = get_db_connection()
+            cursor = conn.cursor(dictionary=True)
+            cursor.execute("""
+                SELECT 
+                    sh.submit_date AS 时间, 
+                    sh.filename AS 提交的项目, 
+                    s.name AS 姓名, 
+                    s.id AS 学号, 
+                    sh.assignment_id AS 作业
+                FROM submission_history sh
+                JOIN students s ON sh.student_id = s.id
+                ORDER BY sh.submit_date DESC
+            """)
+            submissions = cursor.fetchall()
+            cursor.close()
+            conn.close()
+
+            # 创建 DataFrame
+            df = pd.DataFrame(submissions)
+
+            # 格式化日期时间
+            df['时间'] = pd.to_datetime(df['时间']).dt.strftime('%Y-%m-%d %H:%M:%S')
+
+            # 确保列的顺序
+            df = df[['时间', '提交的项目', '姓名', '学号', '作业']]
+
+            # 创建一个 BytesIO 对象，用于存储 Excel 文件
+            output = io.BytesIO()
+
+            # 使用 ExcelWriter 来设置列宽
+            with pd.ExcelWriter(output, engine='xlsxwriter') as writer:
+                df.to_excel(writer, sheet_name='提交记录', index=False)
+                worksheet = writer.sheets['提交记录']
+
+                # 设置列宽
+                worksheet.set_column('A:A', 20)  # 时间
+                worksheet.set_column('B:B', 30)  # 提交的项目
+                worksheet.set_column('C:C', 15)  # 姓名
+                worksheet.set_column('D:D', 15)  # 学号
+                worksheet.set_column('E:E', 20)  # 作业
+
+            output.seek(0)
+
+            return send_file(
+                output,
+                as_attachment=True,
+                download_name='submissions.xlsx',
+                mimetype='application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
+            )
+        except Exception as e:
+            logging.error(f"Error in download_submissions: {str(e)}", exc_info=True)
+            return jsonify({'error': str(e)}), 500
+
+    @app.route('/download-assignment-status')
+    def download_assignment_status():
+        try:
+            conn = get_db_connection()
+            cursor = conn.cursor(dictionary=True)
+            cursor.execute("""
+                SELECT 
+                    s.id AS 学号, 
+                    s.name AS 姓名, 
+                    COALESCE(sub.assignment_id, 'No assignment') AS 作业,
+                    CASE WHEN sub.id IS NOT NULL THEN '已提交' ELSE '未提交' END AS 作业提交情况,
+                    COALESCE(sub.filename, '') AS 提交的项目,
+                    COALESCE(sub.submit_date, '') AS 提交时间
+                FROM students s
+                LEFT JOIN submissions sub ON s.id = sub.student_id
+                ORDER BY s.id, sub.assignment_id
+            """)
+            status_data = cursor.fetchall()
+            cursor.close()
+            conn.close()
+
+            df = pd.DataFrame(status_data)
+
+            # 格式化日期时间
+            df['提交时间'] = pd.to_datetime(df['提交时间']).dt.strftime('%Y-%m-%d %H:%M:%S')
+
+            # 确保列的顺序
+            df = df[['学号', '姓名', '作业', '作业提交情况', '提交的项目', '提交时间']]
+
+            output = io.BytesIO()
+            with pd.ExcelWriter(output, engine='xlsxwriter') as writer:
+                df.to_excel(writer, sheet_name='作业提交情况', index=False)
+                worksheet = writer.sheets['作业提交情况']
+
+                # 设置列宽
+                worksheet.set_column('A:A', 15)  # 学号
+                worksheet.set_column('B:B', 10)  # 姓名
+                worksheet.set_column('C:C', 15)  # 作业
+                worksheet.set_column('D:D', 12)  # 作业提交情况
+                worksheet.set_column('E:E', 30)  # 提交的项目
+                worksheet.set_column('F:F', 20)  # 提交时间
+
+            output.seek(0)
+
+            return send_file(
+                output,
+                as_attachment=True,
+                download_name='assignment_status.xlsx',
+                mimetype='application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
+            )
+        except Exception as e:
+            logging.error(f"Error in download_assignment_status: {str(e)}", exc_info=True)
+            return jsonify({'error': str(e)}), 500
+
+    @app.route('/')
+    def serve_index():
+        if 'student_id' not in session:
+            return redirect(url_for('login'))
+        conn = get_db_connection()
+        cursor = conn.cursor(dictionary=True)
+        cursor.execute('SELECT * FROM assignments ORDER BY deadline')
+        assignments = cursor.fetchall()
+        cursor.close()
+        conn.close()
+        return render_template('index.html', assignments=assignments)
+
+    @app.route('/logout')
+    def logout():
+        session.clear()
+        return redirect(url_for('login'))
+
+    def _build_cors_preflight_response():
+        response = make_response()
+        response.headers.add("Access-Control-Allow-Origin", "*")
+        response.headers.add("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
+        response.headers.add("Access-Control-Allow-Headers", "Content-Type")
+        return response
+
+# 教师管理路由
+def add_teacher_routes(app, mail, bcrypt):
+    # 教师登录装饰器
+    def teacher_required(f):
+        @wraps(f)
+        def decorated_function(*args, **kwargs):
+            if 'teacher_id' not in session:
+                return redirect(url_for('teacher_login'))
+            return f(*args, **kwargs)
+        return decorated_function
+
+    # Teacher Login Route
+    @app.route('/teacher/login', methods=['GET', 'POST'])
+    def teacher_login():
+        if request.method == 'POST':
+            email = request.form['email']
+            password = request.form['password']
+            teacher = validate_teacher(email, password, bcrypt)
+            if teacher:
+                session['teacher_id'] = teacher['id']
+                return redirect(url_for('teacher_panel'))
+            else:
+                flash('Invalid credentials', 'error')
+        return render_template('teacher_login.html')
+
+    @app.route('/teacher/logout')
+    def teacher_logout():
+        session.pop('teacher_id', None)
+        return redirect(url_for('teacher_login'))
+
+    @app.route('/teacher/panel')
+    @teacher_required
+    def teacher_panel():
+        # Fetch the classes this teacher is responsible for
+        teacher_id = session['teacher_id']
+        classes = fetch_teacher_classes(teacher_id)
+        return render_template('teacher_panel.html', classes=classes)
+
+    @app.route('/teacher/download-assignment/<assignment_value>', methods=['GET'])
+    def download_assignment(assignment_value):
+        """生成 ZIP 并直接发送给用户"""
+        teacher_id = session.get('teacher_id')
+        if not teacher_id:
+            return redirect(url_for('teacher_login'))
+
+        # 构造 S3 文件夹路径
+        folder_key = f"sure_homework_define_by_qin/{assignment_value}/"
+
+        # 下载并压缩作业文件夹
+        zip_file_path = download_and_zip_files(os.getenv('S3_BUCKET_NAME'), folder_key)
+
+        if not zip_file_path or not os.path.exists(zip_file_path):
+            logging.error(f"Failed to create ZIP file at {zip_file_path}")
+            return jsonify({"error": "无法创建 zip 文件"}), 500
+
+        try:
+            # 将来自 assignment_value 的文件名进行 URL 编码，以支持中文和特殊字符
+            filename = quote(f"{assignment_value}.zip")
+
+            logging.info(f"Sending file: {zip_file_path} as {filename}")
+            return send_file(zip_file_path, as_attachment=True, download_name=filename, mimetype='application/zip')
+        except Exception as ex:
+            logging.error(f"Error sending file: {str(ex)}")
+            return jsonify({"error": "Error sending file", "details": str(ex)}), 500
+        
+    @app.route('/teacher/class/<int:class_id>')
+    @teacher_required
+    def view_class(class_id):
+        # Fetch the assignments and students of the class
+        assignments = fetch_class_assignments(class_id)
+        students = fetch_class_students(class_id)
+        return render_template('class_detail.html', assignments=assignments, students=students, class_id=class_id)
+
+    @app.route('/teacher/class/<int:class_id>/add_assignment', methods=['POST'])
+    @teacher_required
+    def teacher_add_assignment(class_id):
+        # Adding a new assignment to the class
+        value = request.form['value']
+        name = request.form['name']
+        deadline = request.form['deadline']
+        conn = get_db_connection()
+        cursor = conn.cursor()
+        cursor.execute('INSERT INTO assignments (value, name, deadline, class_id) VALUES (%s, %s, %s, %s)', (value, name, deadline, class_id))
+        conn.commit()
+        cursor.close()
+        conn.close()
+        flash('Assignment added successfully', 'success')
+        return redirect(url_for('view_class', class_id=class_id))
+
+    @app.route('/teacher/edit_assignment/<int:assignment_id>', methods=['POST'])
+    def edit_assignment(assignment_id):
+        new_deadline = request.json.get('deadline')
+        if new_deadline:
+            conn = get_db_connection()
+            cursor = conn.cursor()
+            cursor.execute('UPDATE assignments SET deadline = %s WHERE id = %s', (new_deadline, assignment_id))
+            conn.commit()
+            cursor.close()
+            conn.close()
+            return jsonify({'status': 'success'})
+        return jsonify({'error': 'Invalid deadline'}), 400
+
+    @app.route('/teacher/delete_assignment/<int:assignment_id>', methods=['DELETE'])
+    def delete_assignment(assignment_id):
+        conn = get_db_connection()
+        cursor = conn.cursor()
+        cursor.execute('DELETE FROM assignments WHERE id = %s', (assignment_id,))
+        conn.commit()
+        cursor.close()
+        conn.close()
+        return jsonify({'status': 'success'})
\ No newline at end of file