diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/app.py b/app.py
index d197057..19779eb 100644
--- a/app.py
+++ b/app.py
@@ -45,13 +45,13 @@ submissions_file = 'submissions.csv'
 if not os.path.exists(submissions_file):
     with open(submissions_file, 'w', newline='') as file:
         writer = csv.writer(file)
-        writer.writerow(['ID', '学生姓名', '学号', '提交的文件'])
+        writer.writerow(['ID', '学生姓名', '学号', '作业', '提交的文件'])
 
 
-def add_submission(student, student_id, filename):
+def add_submission(student, student_id, assignment, filename):
     with open(submissions_file, 'a', newline='') as file:
         writer = csv.writer(file)
-        writer.writerow([datetime.datetime.now().isoformat(), student, student_id, filename])
+        writer.writerow([datetime.datetime.now().isoformat(), student, student_id, assignment, filename])
 
 
 def generate_presigned_url(object_key, content_type, expiration=3600):
@@ -63,7 +63,7 @@ def generate_presigned_url(object_key, content_type, expiration=3600):
                                                     Params={
                                                         'Bucket': bucket_name,
                                                         'Key': object_key,
-                                                        'ContentType': content_type  # 使用实际文件的 Content-Type
+                                                        'ContentType': content_type
                                                     },
                                                     ExpiresIn=expiration,
                                                     HttpMethod='PUT'
@@ -81,27 +81,42 @@ def get_presigned_url():
     student_id = request.args.get('student_id')
     filename = request.args.get('filename')
     content_type = request.args.get('content_type', 'application/octet-stream')
+    assignment = request.args.get('assignment')
     logging.info(
-        f"Received request for student: {student}, student_id: {student_id}, filename: {filename}, content_type: {content_type}")
+        f"Received request for student: {student}, student_id: {student_id}, filename: {filename}, content_type: {content_type}, assignment: {assignment}")
 
-    if not student or not filename or not student_id:
-        logging.warning("Missing student, student_id or filename parameter")
-        return jsonify({'error': 'Student, student_id and filename parameters are required'}), 400
+    if not student or not filename or not student_id or not assignment:
+        logging.warning("Missing student, student_id, assignment or filename parameter")
+        return jsonify({'error': 'Student, student_id, assignment and filename parameters are required'}), 400
 
-    folder_name = 'sure_homework_define_by_qin'
-    object_key = f'{folder_name}/{student}-{filename}'
+    folder_name = f'sure_homework_define_by_qin/{assignment}'
+    new_filename = f'{student}_{student_id}_{filename}'
+    object_key = f'{folder_name}/{new_filename}'
 
-    url = generate_presigned_url(object_key, content_type)  # 包含 content_type
+    url = generate_presigned_url(object_key, content_type)
     if not url:
         logging.error("Failed to generate presigned URL")
         return jsonify({'error': 'Failed to generate presigned URL'}), 500
 
-    add_submission(student, student_id, filename)
-
-    logging.info(f"Generated URL: {url}")
     return jsonify({'url': url, 'content_type': content_type})
 
 
+@app.route('/record-submission', methods=['POST'])
+def record_submission():
+    data = request.json
+    student = data.get('student')
+    student_id = data.get('student_id')
+    assignment = data.get('assignment')
+    filename = data.get('filename')
+
+    if not student or not filename or not student_id or not assignment:
+        return jsonify({'error': 'Student, student_id, assignment and filename parameters are required'}), 400
+
+    add_submission(student, student_id, assignment, filename)
+
+    return jsonify({'status': 'success'})
+
+
 @app.route('/')
 def serve_index():
     return send_from_directory('.', 'index.html')
@@ -139,10 +154,37 @@ def health_check():
 
 @app.route('/download-submissions')
 def download_submissions():
-    df = pd.read_csv(submissions_file)
-    output_file = 'submissions.xlsx'
-    df.to_excel(output_file, index=False)
-    return send_file(output_file, as_attachment=True)
+    try:
+        # 使用 csv 模块读取文件，这样可以处理不一致的行
+        with open(submissions_file, 'r', newline='') as file:
+            csv_reader = csv.reader(file)
+            headers = next(csv_reader)  # 读取标题行
+            data = list(csv_reader)  # 读取所有数据行
+
+        # 确定最大列数
+        max_columns = max(len(headers), max(len(row) for row in data))
+
+        # 创建一个新的数据列表，确保每行都有相同数量的列
+        normalized_data = []
+        for row in data:
+            normalized_data.append(row + [''] * (max_columns - len(row)))
+
+        # 创建 DataFrame
+        df = pd.DataFrame(normalized_data, columns=headers + [''] * (max_columns - len(headers)))
+
+        # 重命名列（如果需要）
+        expected_columns = ['ID', '学生姓名', '学号', '作业', '提交的文件']
+        df.columns = expected_columns + [f'额外列{i+1}' for i in range(len(df.columns) - len(expected_columns))]
+
+        # 删除完全为空的行和列
+        df = df.dropna(how='all', axis=0).dropna(how='all', axis=1)
+
+        output_file = 'submissions.xlsx'
+        df.to_excel(output_file, index=False)
+        return send_file(output_file, as_attachment=True)
+    except Exception as e:
+        logging.error(f"Error in download_submissions: {str(e)}", exc_info=True)
+        return jsonify({'error': str(e)}), 500
 
 
 @app.before_request
@@ -179,4 +221,3 @@ if __name__ == '__main__':
         # sys.exit(1)
 
     app.run(debug=True)
-
diff --git a/app.txt b/app.txt
new file mode 100644
index 0000000..19779eb
--- /dev/null
+++ b/app.txt
@@ -0,0 +1,223 @@
+from flask import Flask, request, jsonify, send_from_directory, make_response, send_file
+from flask_cors import CORS
+import boto3
+from botocore.exceptions import NoCredentialsError, ClientError, EndpointConnectionError
+import os
+from dotenv import load_dotenv
+import logging
+import datetime
+import pytz
+from botocore.client import Config
+import csv
+import pandas as pd
+
+# 配置日志
+logging.basicConfig(level=logging.DEBUG, format='%(asctime)s - %(levelname)s - %(message)s')
+
+load_dotenv()  # 从.env文件加载环境变量
+
+app = Flask(__name__, static_url_path='', static_folder='.')
+CORS(app, resources={r"/*": {"origins": "*", "methods": "GET,POST,PUT,DELETE,OPTIONS"}})  # 添加 CORS 支持
+
+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')
+
+# 打印环境变量 (仅用于调试，生产环境中请移除)
+print(f"AWS_ACCESS_KEY_ID: {aws_access_key_id}")
+print(f"AWS_SECRET_ACCESS_KEY: {'*' * len(aws_secret_access_key) if aws_secret_access_key else 'Not set'}")
+print(f"AWS_REGION: {region_name}")
+print(f"S3_BUCKET_NAME: {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')  # 使用 S3v4 签名版本
+)
+
+# 跟踪学生提交信息
+submissions_file = 'submissions.csv'
+
+# 创建或者加载提交文件
+if not os.path.exists(submissions_file):
+    with open(submissions_file, 'w', newline='') as file:
+        writer = csv.writer(file)
+        writer.writerow(['ID', '学生姓名', '学号', '作业', '提交的文件'])
+
+
+def add_submission(student, student_id, assignment, filename):
+    with open(submissions_file, 'a', newline='') as file:
+        writer = csv.writer(file)
+        writer.writerow([datetime.datetime.now().isoformat(), student, student_id, assignment, filename])
+
+
+def generate_presigned_url(object_key, content_type, expiration=3600):
+    try:
+        current_time = datetime.datetime.now(pytz.UTC)
+        logging.info(f"Current UTC time before generating URL: {current_time}")
+
+        response = s3_client.generate_presigned_url('put_object',
+                                                    Params={
+                                                        'Bucket': bucket_name,
+                                                        'Key': object_key,
+                                                        'ContentType': content_type
+                                                    },
+                                                    ExpiresIn=expiration,
+                                                    HttpMethod='PUT'
+                                                    )
+        logging.info(f"Generated presigned URL: {response}")
+        return response
+    except (NoCredentialsError, ClientError, EndpointConnectionError) as e:
+        logging.error(f"Error generating presigned URL: {str(e)}", exc_info=True)
+        return None
+
+
+@app.route('/generate-url', methods=['GET'])
+def get_presigned_url():
+    student = request.args.get('student')
+    student_id = request.args.get('student_id')
+    filename = request.args.get('filename')
+    content_type = request.args.get('content_type', 'application/octet-stream')
+    assignment = request.args.get('assignment')
+    logging.info(
+        f"Received request for student: {student}, student_id: {student_id}, filename: {filename}, content_type: {content_type}, assignment: {assignment}")
+
+    if not student or not filename or not student_id or not assignment:
+        logging.warning("Missing student, student_id, assignment or filename parameter")
+        return jsonify({'error': 'Student, student_id, assignment and filename parameters are required'}), 400
+
+    folder_name = f'sure_homework_define_by_qin/{assignment}'
+    new_filename = f'{student}_{student_id}_{filename}'
+    object_key = f'{folder_name}/{new_filename}'
+
+    url = generate_presigned_url(object_key, content_type)
+    if not url:
+        logging.error("Failed to generate presigned URL")
+        return jsonify({'error': 'Failed to generate presigned URL'}), 500
+
+    return jsonify({'url': url, 'content_type': content_type})
+
+
+@app.route('/record-submission', methods=['POST'])
+def record_submission():
+    data = request.json
+    student = data.get('student')
+    student_id = data.get('student_id')
+    assignment = data.get('assignment')
+    filename = data.get('filename')
+
+    if not student or not filename or not student_id or not assignment:
+        return jsonify({'error': 'Student, student_id, assignment and filename parameters are required'}), 400
+
+    add_submission(student, student_id, assignment, filename)
+
+    return jsonify({'status': 'success'})
+
+
+@app.route('/')
+def serve_index():
+    return send_from_directory('.', 'index.html')
+
+
+@app.route('/health')
+def health_check():
+    logging.info("Health check initiated")
+    try:
+        local_time = datetime.datetime.now()
+        utc_time = datetime.datetime.now(pytz.UTC)
+        logging.info(f"Local time: {local_time}, UTC time: {utc_time}")
+
+        logging.info("Attempting to list S3 buckets")
+        response = s3_client.list_buckets()
+        logging.info(f"Successfully listed buckets: {[bucket['Name'] for bucket in response['Buckets']]}")
+        return jsonify({
+            'status': 'healthy',
+            'message': 'AWS credentials are valid',
+            'local_time': local_time.isoformat(),
+            'utc_time': utc_time.isoformat()
+        }), 200
+    except NoCredentialsError:
+        logging.error("AWS credentials not found", exc_info=True)
+        return jsonify({'status': 'unhealthy', 'message': 'AWS credentials not found'}), 500
+    except ClientError as e:
+        error_code = e.response['Error']['Code']
+        error_message = e.response['Error']['Message']
+        logging.error(f"AWS client error: {error_code} - {error_message}", exc_info=True)
+        return jsonify({'status': 'unhealthy', 'message': f'AWS client error: {error_code} - {error_message}'}), 500
+    except Exception as e:
+        logging.error(f"Unexpected error during health check: {str(e)}", exc_info=True)
+        return jsonify({'status': 'unhealthy', 'message': f'Unexpected error: {str(e)}'}), 500
+
+
+@app.route('/download-submissions')
+def download_submissions():
+    try:
+        # 使用 csv 模块读取文件，这样可以处理不一致的行
+        with open(submissions_file, 'r', newline='') as file:
+            csv_reader = csv.reader(file)
+            headers = next(csv_reader)  # 读取标题行
+            data = list(csv_reader)  # 读取所有数据行
+
+        # 确定最大列数
+        max_columns = max(len(headers), max(len(row) for row in data))
+
+        # 创建一个新的数据列表，确保每行都有相同数量的列
+        normalized_data = []
+        for row in data:
+            normalized_data.append(row + [''] * (max_columns - len(row)))
+
+        # 创建 DataFrame
+        df = pd.DataFrame(normalized_data, columns=headers + [''] * (max_columns - len(headers)))
+
+        # 重命名列（如果需要）
+        expected_columns = ['ID', '学生姓名', '学号', '作业', '提交的文件']
+        df.columns = expected_columns + [f'额外列{i+1}' for i in range(len(df.columns) - len(expected_columns))]
+
+        # 删除完全为空的行和列
+        df = df.dropna(how='all', axis=0).dropna(how='all', axis=1)
+
+        output_file = 'submissions.xlsx'
+        df.to_excel(output_file, index=False)
+        return send_file(output_file, as_attachment=True)
+    except Exception as e:
+        logging.error(f"Error in download_submissions: {str(e)}", exc_info=True)
+        return jsonify({'error': str(e)}), 500
+
+
+@app.before_request
+def before_request_func():
+    if request.method == 'OPTIONS':
+        return _build_cors_preflight_response()
+
+
+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
+
+
+if __name__ == '__main__':
+    local_time = datetime.datetime.now()
+    utc_time = datetime.datetime.now(pytz.UTC)
+    logging.info(f"Application starting. Local time: {local_time}, UTC time: {utc_time}")
+
+    try:
+        logging.info("Validating AWS credentials on startup")
+        sts = boto3.client('sts',
+                           aws_access_key_id=aws_access_key_id,
+                           aws_secret_access_key=aws_secret_access_key,
+                           region_name=region_name)
+        response = sts.get_caller_identity()
+        logging.info(f"AWS credentials validated successfully. Account ID: {response['Account']}")
+    except Exception as e:
+        logging.error(f"Failed to validate AWS credentials: {str(e)}", exc_info=True)
+        # 如果你想在凭证验证失败时退出程序，取消注释下面两行
+        # import sys
+        # sys.exit(1)
+
+    app.run(debug=True)
diff --git a/index.html b/index.html
index cf2e1a3..6d639cb 100644
--- a/index.html
+++ b/index.html
@@ -48,7 +48,7 @@
             color: #555;
             font-weight: 500;
         }
-        input[type="text"] {
+        input[type="text"], select {
             width: 100%;
             padding: 10px;
             border: 1px solid #ddd;
@@ -80,14 +80,7 @@
             border-color: #ccc;
         }
         .file-input-button input[type=file] {
-            font-size: 100px;
-            position: absolute;
-            left: 0;
-            top: 0;
-            opacity: 0;
-            cursor: pointer;
-            width: 100%;
-            height: 100%;
+            display: none;
         }
         #file-name {
             margin-top: 5px;
@@ -167,13 +160,20 @@
                 <label for="student-id">学号:</label>
                 <input type="text" id="student-id" name="student-id" required>
             </div>
+            <div class="form-field">
+                <label for="assignment">选择作业:</label>
+                <select id="assignment" name="assignment" required>
+                    <option value="">请选择作业</option>
+                    <option value="homework1">平时作业1</option>
+                    <option value="homework2">平时作业2</option>
+                    <option value="homework3">平时作业3</option>
+                    <option value="final_homework">结课大作业</option>
+                </select>
+            </div>
             <div class="form-field">
                 <label for="file">选择文件:</label>
                 <div class="file-input-wrapper">
-                    <div class="file-input-button">
-                        选择文件
-                        <input type="file" id="file" name="file" required>
-                    </div>
+                    <button type="button" class="file-input-button">选择文件 <input type="file" id="file" name="file" required></button>
                 </div>
                 <div id="file-name">未选择文件</div>
             </div>
@@ -195,122 +195,148 @@
     </div>
 
     <script>
+        document.querySelector('.file-input-button').addEventListener('click', function() {
+            document.getElementById('file').click();
+        });
+
+        document.getElementById('file').addEventListener('change', function(e) {
+            const fileName = e.target.files[0] ? e.target.files[0].name : '未选择文件';
+            document.getElementById('file-name').textContent = fileName;
+        });
+
         document.getElementById('upload-form').addEventListener('submit', async (e) => {
-    e.preventDefault();
+            e.preventDefault();
 
-    const student = document.getElementById('student').value;
-    const studentId = document.getElementById('student-id').value;
-    const file = document.getElementById('file').files[0];
-    const statusDiv = document.getElementById('status');
-    const progressContainer = document.getElementById('progress-container');
-    const progressBar = document.getElementById('progress-bar');
-    const progressPercentage = document.getElementById('progress-percentage');
-    const uploadSpeed = document.getElementById('upload-speed');
-    const uploadSize = document.getElementById('upload-size');
-    const uploadTime = document.getElementById('upload-time');
+            const student = document.getElementById('student').value;
+            const studentId = document.getElementById('student-id').value;
+            const assignment = document.getElementById('assignment').value;
+            const file = document.getElementById('file').files[0];
+            const statusDiv = document.getElementById('status');
+            const progressContainer = document.getElementById('progress-container');
+            const progressBar = document.getElementById('progress-bar');
+            const progressPercentage = document.getElementById('progress-percentage');
+            const uploadSpeed = document.getElementById('upload-speed');
+            const uploadSize = document.getElementById('upload-size');
+            const uploadTime = document.getElementById('upload-time');
 
-    if (!student || !studentId || !file) {
-        alert('请提供学生姓名、学号，并选择一个文件。');
-        return;
-    }
-
-    statusDiv.textContent = '准备上传...';
-    progressContainer.style.display = 'block';
-
-    try {
-        const response = await fetch(`/generate-url?student=${encodeURIComponent(student)}&student_id=${encodeURIComponent(studentId)}&filename=${encodeURIComponent(file.name)}&content_type=${encodeURIComponent(file.type)}`, {
-            method: 'GET',
-        });
-
-        if (!response.ok) {
-            const errorData = await response.json();
-            throw new Error(`生成预签名URL失败: ${errorData.error}`);
-        }
-        const data = await response.json();
-
-        if (!data.url) {
-            throw new Error('服务器未返回URL');
-        }
-
-        statusDiv.textContent = '正在上传文件...';
-
-        const totalSize = file.size;
-        let uploadedSize = 0;
-        let startTime = Date.now();
-
-        const updateProgress = (additionalProgress = 0) => {
-            uploadedSize += additionalProgress;
-            const percentComplete = (uploadedSize / totalSize) * 100;
-            const elapsedTime = (Date.now() - startTime) / 1000; // 秒
-            const speed = uploadedSize / elapsedTime;
-            const remainingSize = totalSize - uploadedSize;
-            const estimatedRemainingTime = speed > 0 ? remainingSize / speed : 0;
-
-            progressBar.style.width = percentComplete + '%';
-            progressPercentage.textContent = percentComplete.toFixed(2) + '%';
-            uploadSpeed.textContent = `速度: ${formatSize(speed)}/s`;
-            uploadSize.textContent = `${formatSize(uploadedSize)} / ${formatSize(totalSize)}`;
-            uploadTime.textContent = `剩余时间: ${formatTime(estimatedRemainingTime)}`;
-        };
-
-        // 模拟进度更新
-        const progressInterval = setInterval(() => {
-            if (uploadedSize < totalSize) {
-                updateProgress(totalSize / 100); // 每次更新1%的进度
+            if (!student || !studentId || !assignment || !file) {
+                alert('请提供学生姓名、学号、选择作业，并选择一个文件。');
+                return;
             }
-        }, 200);
 
-        // 实际上传
-        const uploadResponse = await fetch(data.url, {
-            method: 'PUT',
-            body: file,
-            headers: {
-                'Content-Type': data.content_type
+            statusDiv.textContent = '准备上传...';
+            progressContainer.style.display = 'block';
+
+            try {
+                const response = await fetch(`/generate-url?student=${encodeURIComponent(student)}&student_id=${encodeURIComponent(studentId)}&assignment=${encodeURIComponent(assignment)}&filename=${encodeURIComponent(file.name)}&content_type=${encodeURIComponent(file.type)}`, {
+                    method: 'GET',
+                });
+
+                if (!response.ok) {
+                    const errorData = await response.json();
+                    throw new Error(`生成预签名URL失败: ${errorData.error}`);
+                }
+                const data = await response.json();
+
+                if (!data.url) {
+                    throw new Error('服务器未返回URL');
+                }
+
+                statusDiv.textContent = '正在上传文件...';
+
+                const totalSize = file.size;
+                let uploadedSize = 0;
+                let startTime = Date.now();
+
+                const updateProgress = (additionalProgress = 0) => {
+                    uploadedSize += additionalProgress;
+                    const percentComplete = (uploadedSize / totalSize) * 100;
+                    const elapsedTime = (Date.now() - startTime) / 1000; // 秒
+                    const speed = uploadedSize / elapsedTime;
+                    const remainingSize = totalSize - uploadedSize;
+                    const estimatedRemainingTime = speed > 0 ? remainingSize / speed : 0;
+
+                    progressBar.style.width = percentComplete + '%';
+                    progressPercentage.textContent = percentComplete.toFixed(2) + '%';
+                    uploadSpeed.textContent = `速度: ${formatSize(speed)}/s`;
+                    uploadSize.textContent = `${formatSize(uploadedSize)} / ${formatSize(totalSize)}`;
+                    uploadTime.textContent = `剩余时间: ${formatTime(estimatedRemainingTime)}`;
+                };
+
+                // 模拟进度更新
+                const progressInterval = setInterval(() => {
+                    if (uploadedSize < totalSize) {
+                        updateProgress(totalSize / 100); // 每次更新1%的进度
+                    }
+                }, 200);
+
+                // 实际上传
+                const uploadResponse = await fetch(data.url, {
+                    method: 'PUT',
+                    body: file,
+                    headers: {
+                        'Content-Type': data.content_type
+                    }
+                });
+
+                clearInterval(progressInterval);
+
+                if (!uploadResponse.ok) {
+                    throw new Error(`Upload failed: ${uploadResponse.statusText}`);
+                }
+
+                // 确保进度达到100%
+                updateProgress(totalSize - uploadedSize);
+
+                statusDiv.textContent = '文件上传成功';
+
+                // 上传成功后，记录提交信息
+                const recordResponse = await fetch('/record-submission', {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json'
+                    },
+                    body: JSON.stringify({
+                        student,
+                        student_id: studentId,
+                        assignment,
+                        filename: file.name
+                    })
+                });
+
+                if (!recordResponse.ok) {
+                    const errorRecordData = await recordResponse.json();
+                    throw new Error(`Failed to record submission: ${errorRecordData.error}`);
+                }
+
+                alert('文件上传并记录成功');
+
+            } catch (error) {
+                console.error('错误:', error);
+                statusDiv.textContent = `错误: ${error.message}`;
+                alert('发生错误: ' + error.message);
             }
         });
 
-        clearInterval(progressInterval);
-
-        if (!uploadResponse.ok) {
-            throw new Error(`Upload failed: ${uploadResponse.statusText}`);
+        function formatSize(bytes) {
+            if (bytes === 0) return '0 Bytes';
+            const k = 1024;
+            const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
+            const i = Math.floor(Math.log(bytes) / Math.log(k));
+            return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
         }
 
-        // 确保进度达到100%
-        updateProgress(totalSize - uploadedSize);
-
-        statusDiv.textContent = '文件上传成功';
-        alert('文件上传成功');
-
-    } catch (error) {
-        console.error('错误:', error);
-        statusDiv.textContent = `错误: ${error.message}`;
-        alert('发生错误: ' + error.message);
-    }
-});
-
-function formatSize(bytes) {
-    if (bytes === 0) return '0 Bytes';
-    const k = 1024;
-    const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
-    const i = Math.floor(Math.log(bytes) / Math.log(k));
-    return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
-}
-
-function formatTime(seconds) {
-    if (isNaN(seconds) || !isFinite(seconds)) {
-        return '计算中';
-    }
-    if (seconds < 60) return Math.round(seconds) + ' 秒';
-    const minutes = Math.floor(seconds / 60);
-    const remainingSeconds = Math.round(seconds % 60);
-    return `${minutes} 分 ${remainingSeconds} 秒`;
-}
-
-// 添加文件名显示功能
-document.getElementById('file').addEventListener('change', function(e) {
-    const fileName = e.target.files[0] ? e.target.files[0].name : '未选择文件';
-    document.getElementById('file-name').textContent = fileName;
-});
+        function formatTime(seconds) {
+            if (isNaN(seconds) || !isFinite(seconds)) {
+                return '计算中';
+            }
+            if (seconds < 60) return Math.round(seconds) + ' 秒';
+            const minutes = Math.floor(seconds / 60);
+            const remainingSeconds = Math.round(seconds % 60);
+            return `${minutes} 分 ${remainingSeconds} 秒`;
+        }
     </script>
 </body>
+
 </html>
+
diff --git a/index.txt b/index.txt
new file mode 100644
index 0000000..6d639cb
--- /dev/null
+++ b/index.txt
@@ -0,0 +1,342 @@
+<!DOCTYPE html>
+<html lang="zh-CN">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>秀儿文件提交系统</title>
+    <style>
+        body {
+            font-family: 'Helvetica Neue', Arial, sans-serif;
+            background-color: #f0f2f5;
+            margin: 0;
+            padding: 0;
+            display: flex;
+            justify-content: center;
+            align-items: center;
+            min-height: 100vh;
+        }
+        .container {
+            background-color: #ffffff;
+            border-radius: 8px;
+            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
+            padding: 30px;
+            width: 100%;
+            max-width: 400px;
+        }
+        .image-container {
+            margin-bottom: 20px;
+            border-radius: 8px;
+            overflow: hidden;
+        }
+        .image-container img {
+            width: 100%;
+            height: auto;
+            display: block;
+        }
+        h1 {
+            color: #333;
+            font-size: 24px;
+            margin-bottom: 20px;
+            text-align: center;
+        }
+        .form-field {
+            margin-bottom: 20px;
+        }
+        label {
+            display: block;
+            margin-bottom: 5px;
+            color: #555;
+            font-weight: 500;
+        }
+        input[type="text"], select {
+            width: 100%;
+            padding: 10px;
+            border: 1px solid #ddd;
+            border-radius: 4px;
+            font-size: 16px;
+        }
+        .file-input-wrapper {
+            position: relative;
+            overflow: visible;
+            display: inline-block;
+            width: 100%;
+        }
+        .file-input-button {
+            background-color: #f0f0f0;
+            border: 1px solid #ddd;
+            color: #333;
+            padding: 10px 15px;
+            border-radius: 4px;
+            font-size: 16px;
+            cursor: pointer;
+            display: inline-block;
+            width: 100%;
+            text-align: center;
+            box-sizing: border-box;
+            transition: background-color 0.3s, border-color 0.3s;
+        }
+        .file-input-button:hover {
+            background-color: #e0e0e0;
+            border-color: #ccc;
+        }
+        .file-input-button input[type=file] {
+            display: none;
+        }
+        #file-name {
+            margin-top: 5px;
+            font-size: 14px;
+            color: #666;
+        }
+        button[type="submit"] {
+            background-color: #1890ff;
+            color: white;
+            border: none;
+            padding: 12px 20px;
+            border-radius: 4px;
+            font-size: 16px;
+            cursor: pointer;
+            width: 100%;
+            transition: background-color 0.3s;
+        }
+        button[type="submit"]:hover {
+            background-color: #40a9ff;
+        }
+        .progress-container {
+            margin-top: 20px;
+            display: none;
+        }
+        .progress {
+            height: 10px;
+            background-color: #f0f0f0;
+            border-radius: 5px;
+            overflow: hidden;
+        }
+        .progress-bar {
+            height: 100%;
+            background-color: #1890ff;
+            width: 0;
+            transition: width 0.3s ease;
+        }
+        #progress-percentage {
+            font-size: 14px;
+            color: #666;
+            margin-top: 5px;
+        }
+        #status {
+            margin-top: 15px;
+            font-size: 14px;
+            color: #666;
+        }
+        #download-link {
+            display: inline-block;
+            margin-top: 20px;
+            text-decoration: none;
+            color: #1890ff;
+            font-size: 14px;
+        }
+        .upload-stats {
+            margin-top: 10px;
+            font-size: 14px;
+            color: #666;
+        }
+        .upload-stats span {
+            display: inline-block;
+            margin-right: 15px;
+        }
+    </style>
+</head>
+<body>
+    <div class="container">
+        <div class="image-container">
+            <img src="image.jpg" alt="描述性文本">
+        </div>
+        <h1>秀儿文件提交系统</h1>
+        <form id="upload-form">
+            <div class="form-field">
+                <label for="student">学生姓名:</label>
+                <input type="text" id="student" name="student" required>
+            </div>
+            <div class="form-field">
+                <label for="student-id">学号:</label>
+                <input type="text" id="student-id" name="student-id" required>
+            </div>
+            <div class="form-field">
+                <label for="assignment">选择作业:</label>
+                <select id="assignment" name="assignment" required>
+                    <option value="">请选择作业</option>
+                    <option value="homework1">平时作业1</option>
+                    <option value="homework2">平时作业2</option>
+                    <option value="homework3">平时作业3</option>
+                    <option value="final_homework">结课大作业</option>
+                </select>
+            </div>
+            <div class="form-field">
+                <label for="file">选择文件:</label>
+                <div class="file-input-wrapper">
+                    <button type="button" class="file-input-button">选择文件 <input type="file" id="file" name="file" required></button>
+                </div>
+                <div id="file-name">未选择文件</div>
+            </div>
+            <button type="submit">提交 (截止日期: 2024.07.03)</button>
+        </form>
+        <div id="status"></div>
+        <div class="progress-container" id="progress-container">
+            <div class="progress">
+                <div class="progress-bar" id="progress-bar"></div>
+            </div>
+            <div id="progress-percentage">0%</div>
+            <div class="upload-stats">
+                <span id="upload-speed">速度: 0 KB/s</span>
+                <span id="upload-size">0 KB / 0 KB</span>
+                <span id="upload-time">剩余时间: 计算中</span>
+            </div>
+        </div>
+        <a href="/download-submissions" id="download-link">下载统计表格</a>
+    </div>
+
+    <script>
+        document.querySelector('.file-input-button').addEventListener('click', function() {
+            document.getElementById('file').click();
+        });
+
+        document.getElementById('file').addEventListener('change', function(e) {
+            const fileName = e.target.files[0] ? e.target.files[0].name : '未选择文件';
+            document.getElementById('file-name').textContent = fileName;
+        });
+
+        document.getElementById('upload-form').addEventListener('submit', async (e) => {
+            e.preventDefault();
+
+            const student = document.getElementById('student').value;
+            const studentId = document.getElementById('student-id').value;
+            const assignment = document.getElementById('assignment').value;
+            const file = document.getElementById('file').files[0];
+            const statusDiv = document.getElementById('status');
+            const progressContainer = document.getElementById('progress-container');
+            const progressBar = document.getElementById('progress-bar');
+            const progressPercentage = document.getElementById('progress-percentage');
+            const uploadSpeed = document.getElementById('upload-speed');
+            const uploadSize = document.getElementById('upload-size');
+            const uploadTime = document.getElementById('upload-time');
+
+            if (!student || !studentId || !assignment || !file) {
+                alert('请提供学生姓名、学号、选择作业，并选择一个文件。');
+                return;
+            }
+
+            statusDiv.textContent = '准备上传...';
+            progressContainer.style.display = 'block';
+
+            try {
+                const response = await fetch(`/generate-url?student=${encodeURIComponent(student)}&student_id=${encodeURIComponent(studentId)}&assignment=${encodeURIComponent(assignment)}&filename=${encodeURIComponent(file.name)}&content_type=${encodeURIComponent(file.type)}`, {
+                    method: 'GET',
+                });
+
+                if (!response.ok) {
+                    const errorData = await response.json();
+                    throw new Error(`生成预签名URL失败: ${errorData.error}`);
+                }
+                const data = await response.json();
+
+                if (!data.url) {
+                    throw new Error('服务器未返回URL');
+                }
+
+                statusDiv.textContent = '正在上传文件...';
+
+                const totalSize = file.size;
+                let uploadedSize = 0;
+                let startTime = Date.now();
+
+                const updateProgress = (additionalProgress = 0) => {
+                    uploadedSize += additionalProgress;
+                    const percentComplete = (uploadedSize / totalSize) * 100;
+                    const elapsedTime = (Date.now() - startTime) / 1000; // 秒
+                    const speed = uploadedSize / elapsedTime;
+                    const remainingSize = totalSize - uploadedSize;
+                    const estimatedRemainingTime = speed > 0 ? remainingSize / speed : 0;
+
+                    progressBar.style.width = percentComplete + '%';
+                    progressPercentage.textContent = percentComplete.toFixed(2) + '%';
+                    uploadSpeed.textContent = `速度: ${formatSize(speed)}/s`;
+                    uploadSize.textContent = `${formatSize(uploadedSize)} / ${formatSize(totalSize)}`;
+                    uploadTime.textContent = `剩余时间: ${formatTime(estimatedRemainingTime)}`;
+                };
+
+                // 模拟进度更新
+                const progressInterval = setInterval(() => {
+                    if (uploadedSize < totalSize) {
+                        updateProgress(totalSize / 100); // 每次更新1%的进度
+                    }
+                }, 200);
+
+                // 实际上传
+                const uploadResponse = await fetch(data.url, {
+                    method: 'PUT',
+                    body: file,
+                    headers: {
+                        'Content-Type': data.content_type
+                    }
+                });
+
+                clearInterval(progressInterval);
+
+                if (!uploadResponse.ok) {
+                    throw new Error(`Upload failed: ${uploadResponse.statusText}`);
+                }
+
+                // 确保进度达到100%
+                updateProgress(totalSize - uploadedSize);
+
+                statusDiv.textContent = '文件上传成功';
+
+                // 上传成功后，记录提交信息
+                const recordResponse = await fetch('/record-submission', {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json'
+                    },
+                    body: JSON.stringify({
+                        student,
+                        student_id: studentId,
+                        assignment,
+                        filename: file.name
+                    })
+                });
+
+                if (!recordResponse.ok) {
+                    const errorRecordData = await recordResponse.json();
+                    throw new Error(`Failed to record submission: ${errorRecordData.error}`);
+                }
+
+                alert('文件上传并记录成功');
+
+            } catch (error) {
+                console.error('错误:', error);
+                statusDiv.textContent = `错误: ${error.message}`;
+                alert('发生错误: ' + error.message);
+            }
+        });
+
+        function formatSize(bytes) {
+            if (bytes === 0) return '0 Bytes';
+            const k = 1024;
+            const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
+            const i = Math.floor(Math.log(bytes) / Math.log(k));
+            return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
+        }
+
+        function formatTime(seconds) {
+            if (isNaN(seconds) || !isFinite(seconds)) {
+                return '计算中';
+            }
+            if (seconds < 60) return Math.round(seconds) + ' 秒';
+            const minutes = Math.floor(seconds / 60);
+            const remainingSeconds = Math.round(seconds % 60);
+            return `${minutes} 分 ${remainingSeconds} 秒`;
+        }
+    </script>
+</body>
+
+</html>
+
diff --git a/submissions.csv b/submissions.csv
index e8c51f5..4c6ee6f 100644
--- a/submissions.csv
+++ b/submissions.csv
@@ -11,3 +11,10 @@ ID,学生姓名,学号,提交的文件
 2024-07-03T02:43:01.033652,534534,543534,数学分析 陈纪修 第三版 上 by 陈纪修，于崇华，金路 (z-lib.org).pdf
 2024-07-03T02:46:15.397526,CCC,AAA,"周易译注 (黄寿祺,张善文) (Z-Library).pdf"
 2024-07-03T02:48:26.189052,2423,423423,阅读1.pdf
+2024-07-03T03:06:53.527517,李顺,342,homework1,计算机网络_数据链路层.ppt
+2024-07-03T03:10:31.977965,Sure,324234,homework2,Sure_324234_彩虹易支付纯净源码.zip
+2024-07-03T03:15:33.951611,342,453534,homework2,342_453534_男人来自火星，女人来自金星（套装共4册） (约翰·格雷) (Z-Library).pdf
+2024-07-03T03:22:12.013752,李无天,983,homework3,李无天_983_真正全集：王阳明全集（以权威的隆庆初刻本《王文成公全书》为底本，增补2卷旧本未刊内容！王阳明的“心学哲理、文治武功、传奇人生”全在这... (Z-Library).pdf
+2024-07-03T03:24:24.223088,王刚,324,homework3,王刚_324_期末复习.pptx
+2024-07-06T19:16:46.811930,嗷呜呜0706,321,homework1,嗷呜呜0706_321_知行合一王阳明套装 (度阴山) (Z-Library).pdf
+2024-07-07T00:28:05.848994,test,432,homework1,期末复习.pptx
diff --git a/submissions.xlsx b/submissions.xlsx
index 1670d24..e3a2659 100644
Binary files a/submissions.xlsx and b/submissions.xlsx differ