# 数据库配置 DB_URL=jdbc:mysql://your-host:3306/your-db DB_USERNAME=your-username DB_PASSWORD=your-password # JWT配置 JWT_SECRET=your-super-secret-key JWT_EXPIRATION=86400000 # 环境配置 SPRING_PROFILES_ACTIVE=dev # CORS配置 CORS_ALLOWED_ORIGINS=https://your-frontend.com