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from flask import Flask, request, redirect, url_for, render_templatefrom werkzeug.utils import secure_filenameimport os# 初始化Flask应用app = Flask(__name__)# 配置上传设置app.config['UPLOAD_FOLDER'] = 'uploads' # 上传文件保存目录app.config['MAX_CONTENT_LENGTH'] = 16 * 1024 * 1024 # 最大上传文件大小：16MB# 允许上传的文件扩展名ALLOWED_EXTENSIONS = {'txt', 'pdf', 'png', 'jpg', 'jpeg', 'gif'}# 确保上传目录存在os.makedirs(app.config['UPLOAD_FOLDER'], exist_ok=True)def allowed_file(filename): """检查文件扩展名是否被允许""" return '.' in filename and
filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS@app.route('/', methods=['GET', 'POST'])def upload_file(): if request.method == 'POST': # 检查请求中是否有文件部分 if 'file' not in request.files: return redirect(request.url)
file = request.files['file']
# 如果用户没有选择文件，浏览器可能会提交一个空部分 if file.filename == '': return redirect(request.url)
# 验证文件并保存 if file and allowed_file(file.filename): # 使用secure_filename确保文件名安全
filename = secure_filename(file.filename) # 保存文件到上传目录
file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename)) # 上传成功后显示成功页面 return render_template('success.html', filename=filename)
# GET请求时显示上传表单 return render_template('upload.html')@app.route('/uploads/<filename>')def uploaded_file(filename): """返回上传文件的路径（实际应用中可能需要更复杂的处理）""" return f'文件已上传: {filename}'if __name__ == '__main__':
app.run(debug=True)<!DOCTYPE html><html lang="zh-CN"><head> <title>Flask 文件上传</title> <!-- Bootstrap 4 CSS --> <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css" integrity="sha384-xOolHFLEh07PJGoPkLv1IbcEPTNtaed2xpHsD9ESMhqIYd0nLMwNLD69Npy4HI+N" crossorigin="anonymous"> <!-- Font Awesome 图标 --> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css"> <style> body { font-family: 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif; background-color: #f8f9fa; padding: 40px 0;
} .upload-container { max-width: 600px; margin: 0 auto; background-color: white; border-radius: 10px; box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08); padding: 30px;
} .upload-header { text-align: center; margin-bottom: 30px; padding-bottom: 20px; border-bottom: 1px solid #eee;
} .upload-header h1 { color: #343a40; font-weight: 600; font-size: 1.8rem;
} .upload-steps { display: flex; justify-content: space-between; margin-bottom: 30px; position: relative;
} .upload-steps::before { content: ''; position: absolute; top: 15px; left: 15%; right: 15%; height: 2px; background-color: #e9ecef; z-index: 1;
} .step { text-align: center; position: relative; z-index: 2; width: 30%;
} .step-icon { width: 35px; height: 35px; border-radius: 50%; background-color: #e9ecef; color: #6c757d; display: inline-flex; align-items: center; justify-content: center; margin-bottom: 8px; font-weight: bold;
} .step.active .step-icon { background-color: #28a745; color: white;
} .step-text { font-size: 0.9rem; color: #6c757d;
} .step.active .step-text { color: #28a745; font-weight: 500;
} .allowed-types { font-size: 0.9rem; color: #6c757d; margin-top: 8px; padding: 8px 12px; background-color: #f8f9fa; border-radius: 4px;
} .file-input-area { border: 2px dashed #ced4da; border-radius: 8px; padding: 40px 20px; text-align: center; margin-bottom: 25px; transition: all 0.3s ease; background-color: #fafafa;
} .file-input-area:hover, .file-input-area.drag-over { border-color: #28a745; background-color: #f0fff4;
} .file-input-area input[type="file"] { display: none;
} .select-file-btn { background-color: #007bff; color: white; border: none; padding: 10px 20px; border-radius: 6px; margin-top: 15px; cursor: pointer; font-weight: 500; transition: all 0.2s ease;
} .select-file-btn:hover { background-color: #0069d9; transform: translateY(-2px);
} .file-info { margin-top: 20px; padding: 15px; border-radius: 6px; background-color: #f8f9fa; display: none;
} .file-info.visible { display: block; border: 1px solid #d4edda; background-color: #f0fff4;
} .upload-actions { text-align: center; margin-top: 30px;
} .upload-btn { background-color: #28a745; color: white; border: none; padding: 12px 30px; border-radius: 6px; font-size: 1.1rem; font-weight: 500; cursor: pointer; transition: all 0.3s ease; min-width: 200px;
} .upload-btn:disabled { background-color: #6c757d; cursor: not-allowed; transform: none;
} .upload-btn:not(:disabled):hover { background-color: #218838; transform: translateY(-2px); box-shadow: 0 4px 8px rgba(40, 167, 69, 0.2);
} .action-icon { margin-right: 8px;
} .instruction-text { color: #495057; margin-bottom: 5px;
} .secondary-text { color: #6c757d; font-size: 0.9rem;
} </style></head><body> <div class="container"> <div class="upload-container"> <div class="upload-header"> <h1><i class="fas fa-cloud-upload-alt text-success mr-2"></i>文件上传</h1> <p class="text-muted">按照步骤上传您的文件到服务器</p> </div> <!-- 步骤指示器 --> <div class="upload-steps"> <div class="step active"> <div class="step-icon">1</div> <div class="step-text">选择文件</div> </div> <div class="step"> <div class="step-icon">2</div> <div class="step-text">确认文件</div> </div> <div class="step"> <div class="step-icon">3</div> <div class="step-text">完成上传</div> </div> </div> <div class="upload-form"> <form method="POST" enctype="multipart/form-data"> <!-- 文件选择区域 --> <div class="file-input-area" id="fileDropArea"> <i class="fas fa-file-upload fa-3x text-muted mb-3"></i> <p class="instruction-text">请选择或拖放文件到此处</p> <p class="secondary-text">支持单次上传一个文件</p> <label for="file" class="select-file-btn"> <i class="fas fa-folder-open action-icon"></i>选择文件 </label> <input type="file" name="file" id="file"> </div> <!-- 选中文件信息 --> <div id="fileInfo" class="file-info"> <div class="d-flex justify-content-between align-items-center"> <div> <i class="fas fa-file-check text-success mr-2"></i> <span id="fileName">文件名</span> </div> <div> <span id="fileSize" class="text-muted mr-3">文件大小</span> <button type="button" id="removeFile" class="btn btn-sm btn-outline-danger"> <i class="fas fa-times"></i> </button> </div> </div> </div> <!-- 文件格式说明 --> <p class="allowed-types"> <i class="fas fa-info-circle text-primary mr-1"></i>
允许的文件类型: txt, pdf, png, jpg, jpeg, gif (最大 16MB) </p> <!-- 上传按钮区域 --> <div class="upload-actions"> <button type="submit" class="upload-btn" id="uploadButton" disabled> <i class="fas fa-paper-plane action-icon"></i>上传文件 </button> </div> </form> </div> </div> </div> <!-- Bootstrap JS 和依赖 --> <script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script> <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-Fy6S3B9q64WdZWQUiU+q4/2Lc9npb8tCaSX9FK7E8HnRr0Jz8D6OP9dO5Vg3Q9ct" crossorigin="anonymous"></script> <script> // 获取DOM元素 const fileInput = document.getElementById('file'); const fileDropArea = document.getElementById('fileDropArea'); const fileInfo = document.getElementById('fileInfo'); const fileName = document.getElementById('fileName'); const fileSize = document.getElementById('fileSize'); const removeFileBtn = document.getElementById('removeFile'); const uploadButton = document.getElementById('uploadButton'); const steps = document.querySelectorAll('.step'); // 文件选择处理
fileInput.addEventListener('change', handleFileSelect); // 移除文件
removeFileBtn.addEventListener('click', function() {
fileInput.value = '';
fileInfo.classList.remove('visible');
uploadButton.disabled = true;
updateSteps(0);
}); // 拖放功能
['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
fileDropArea.addEventListener(eventName, preventDefaults, false);
}); function preventDefaults(e) {
e.preventDefault();
e.stopPropagation();
}
fileDropArea.addEventListener('dragover', function() { this.classList.add('drag-over');
});
fileDropArea.addEventListener('dragleave', function() { this.classList.remove('drag-over');
});
fileDropArea.addEventListener('drop', function(e) { this.classList.remove('drag-over'); const dt = e.dataTransfer; const files = dt.files; if (files.length > 0) {
fileInput.files = files;
handleFileSelect(e);
}
}); // 处理文件选择 function handleFileSelect(e) { if (fileInput.files.length > 0) { const file = fileInput.files[0];
fileName.textContent = file.name; // 格式化文件大小 let sizeText; if (file.size < 1024 * 1024) {
sizeText = (file.size / 1024).toFixed(2) + ' KB';
} else {
sizeText = (file.size / (1024 * 1024)).toFixed(2) + ' MB';
}
fileSize.textContent = sizeText; // 显示文件信息，启用上传按钮
fileInfo.classList.add('visible');
uploadButton.disabled = false; // 更新步骤指示器
updateSteps(1);
}
} // 更新步骤指示器 function updateSteps(activeStepIndex) {
steps.forEach((step, index) => { if (index === activeStepIndex) {
step.classList.add('active');
} else {
step.classList.remove('active');
}
});
} </script></body></html><!DOCTYPE html><html><head> <title>上传成功</title> <style> body { font-family: Arial, sans-serif; text-align: center; padding: 50px;
} .success-message { color: #4CAF50; font-size: 1.2em;
} a { display: inline-block; margin-top: 20px; color: #2196F3; text-decoration: none;
} a:hover { text-decoration: underline;
} </style></head><body> <h1>上传成功！</h1> <p class="success-message">文件 "{{ filename }}" 已成功上传。</p> <a href="{{ url_for('upload_file') }}">上传另一个文件</a></body></html>
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