参考资料：点餐的功能要求如下。 1、用户登录，注册，搜索美食，浏览菜单，点击美食，跳转美食详情页，可加入购物车，可删除购物车，可收藏美食，可取消收藏。 2、用户下单（可以选择商品，比如购物车有三个商品，可以任意选两个下单），然后填个人信息（包括：配送方式 外卖或堂食，手机号），然后支付。可以催单。 3、用户支付时，需要选择支付方式（微信，支付宝，银行卡（储蓄卡，信用卡）），并确认支付。支付后系统扣除用户账户余额。 4、用户可以查看历史订单，可以查看余额，可以修改昵称。 5、VIP用户所有商品可以打八折。 6、管理员添加用户信息，删除用户信息，修改用户信息，设置VIP用户。（所有操作都需要登录）。 7、商家添加美食信息，删除美食信息，修改美食信息，提现。（所有操作都需要登录）。 根据这些画组件图使用 PlantUML 代码

以下是使用PlantUML代码画出的组件图：

@startuml

!define AWSPUML https://raw.githubusercontent.com/awslabs/aws-icons-for-plantuml/v14.0.2/dist

!includeurl AWSPUML/CustomerEngagement/amazon-pinpoint-communications.puml
!includeurl AWSPUML/AppIntegration/amazon-appflow.puml
!includeurl AWSPUML/ApplicationIntegration/amazon-sns.puml
!includeurl AWSPUML/Compute/amazon-ec2.puml
!includeurl AWSPUML/Compute/amazon-lightsail.puml
!includeurl AWSPUML/Compute/amazon-ecs.puml
!includeurl AWSPUML/Compute/amazon-elastic-container-registry.puml
!includeurl AWSPUML/Compute/amazon-elastic-kubernetes-service.puml
!includeurl AWSPUML/Compute/amazon-elastic-beanstalk.puml
!includeurl AWSPUML/Database/amazon-rds.puml
!includeurl AWSPUML/Database/amazon-dynamodb.puml
!includeurl AWSPUML/Database/amazon-documentdb.puml
!includeurl AWSPUML/Database/amazon-elasticache.puml
!includeurl AWSPUML/Database/amazon-neptune.puml
!includeurl AWSPUML/Database/amazon-qldb.puml
!includeurl AWSPUML/Database/amazon-redshift.puml
!includeurl AWSPUML/Database/amazon-timestream.puml
!includeurl AWSPUML/DeveloperTools/amazon-codebuild.puml
!includeurl AWSPUML/DeveloperTools/amazon-codecommit.puml
!includeurl AWSPUML/DeveloperTools/amazon-codedeploy.puml
!includeurl AWSPUML/DeveloperTools/amazon-codepipeline.puml
!includeurl AWSPUML/DeveloperTools/amazon-xray.puml
!includeurl AWSPUML/GameDevelopment/amazon-gamelift.puml
!includeurl AWSPUML/InternetOfThings/amazon-freertos.puml
!includeurl AWSPUML/InternetOfThings/amazon-iot.puml
!includeurl AWSPUML/InternetOfThings/amazon-iot-analytics.puml
!includeurl AWSPUML/InternetOfThings/amazon-iot-device-defender.puml
!includeurl AWSPUML/InternetOfThings/amazon-iot-device-management.puml
!includeurl AWSPUML/InternetOfThings/amazon-iot-events.puml
!includeurl AWSPUML/InternetOfThings/amazon-iot-sitewise.puml
!includeurl AWSPUML/InternetOfThings/amazon-iot-things-graph.puml
!includeurl AWSPUML/InternetOfThings/amazon-iot-greengrass.puml
!includeurl AWSPUML/MachineLearning/amazon-sagemaker.puml
!includeurl AWSPUML/ManagementAndGovernance/amazon-cloudwatch.puml
!includeurl AWSPUML/ManagementAndGovernance/amazon-cloudformation.puml
!includeurl AWSPUML/ManagementAndGovernance/amazon-cloudtrail.puml
!includeurl AWSPUML/ManagementAndGovernance/amazon-config.puml
!includeurl AWSPUML/ManagementAndGovernance/amazon-control-tower.puml
!includeurl AWSPUML/ManagementAndGovernance/amazon-service-catalog.puml
!includeurl AWSPUML/MessagingAndTargeting/amazon-ses.puml
!includeurl AWSPUML/MessagingAndTargeting/amazon-sms-and-voice.puml
!includeurl AWSPUML/MessagingAndTargeting/amazon-pinpoint.puml
!includeurl AWSPUML/MigrationAndTransfer/amazon-s3-transfer-acceleration.puml
!includeurl AWSPUML/MigrationAndTransfer/amazon-snowball.puml
!includeurl AWSPUML/MigrationAndTransfer/amazon-snowmobile.puml
!includeurl AWSPUML/Mobile/amazon-mobile-analytics.puml
!includeurl AWSPUML/Mobile/amazon-pinpoint-mobile.puml
!includeurl AWSPUML/NetworkAndContentDelivery/amazon-cloudfront.puml
!includeurl AWSPUML/NetworkAndContentDelivery/amazon-vpc.puml
!includeurl AWSPUML/QuantumTechnologies/amazon-braket.puml
!includeurl AWSPUML/Robotics/amazon-robomaker.puml
!includeurl AWSPUML/Satellite/amazon-ground-station.puml
!includeurl AWSPUML/SecurityIdentityAndCompliance/amazon-iam.puml
!includeurl AWSPUML/SecurityIdentityAndCompliance/amazon-cognito.puml
!includeurl AWSPUML/SecurityIdentityAndCompliance/amazon-guardduty.puml
!includeurl AWSPUML/SecurityIdentityAndCompliance/amazon-macie.puml
!includeurl AWSPUML/SecurityIdentityAndCompliance/amazon-secret-manager.puml
!includeurl AWSPUML/SecurityIdentityAndCompliance/amazon-security-hub.puml
!includeurl AWSPUML/SecurityIdentityAndCompliance/amazon-shield.puml
!includeurl AWSPUML/SecurityIdentityAndCompliance/amazon-waf.puml
!includeurl AWSPUML/Storage/amazon-s3.puml
!includeurl AWSPUML/Storage/amazon-ebs.puml
!includeurl AWSPUML/Storage/amazon-efs.puml
!includeurl AWSPUML/Storage/amazon-glacier.puml
!includeurl AWSPUML/Storage/amazon-storage-gateway.puml

title 点餐系统组件图

actor User
actor VIPUser
actor Admin
actor Merchant

package "User Functionality" {
  [Login/Register]
  [Search Food]
  [Browse Menu]
  [View Food Details]
  [Add to Cart]
  [Remove from Cart]
  [Favorite Food]
  [Unfavorite Food]
  [Place Order]
  [Fill in Personal Information]
  [Pay]
  [View Order History]
  [View Balance]
  [Edit Nickname]
  [View Discounted Prices]
  User --> [Login/Register] : Performs
  User --> [Search Food] : Performs
  User --> [Browse Menu] : Performs
  User --> [View Food Details] : Performs
  User --> [Add to Cart] : Performs
  User --> [Remove from Cart] : Performs
  User --> [Favorite Food] : Performs
  User --> [Unfavorite Food] : Performs
  User --> [Place Order] : Performs
  User --> [Fill in Personal Information] : Performs
  User --> [Pay] : Performs
  User --> [View Order History] : Performs
  User --> [View Balance] : Performs
  User --> [Edit Nickname] : Performs
  VIPUser --> [View Discounted Prices] : Performs
}

package "Admin Functionality" {
  [Add User Information]
  [Delete User Information]
  [Modify User Information]
  [Set VIP User]
  Admin --> [Add User Information] : Performs
  Admin --> [Delete User Information] : Performs
  Admin --> [Modify User Information] : Performs
  Admin --> [Set VIP User] : Performs
}

package "Merchant Functionality" {
  [Add Food Information]
  [Delete Food Information]
  [Modify Food Information]
  [Withdraw]
  Merchant --> [Add Food Information] : Performs
  Merchant --> [Delete Food Information] : Performs
  Merchant --> [Modify Food Information] : Performs
  Merchant --> [Withdraw] : Performs
}

[Login/Register] --> [Amazon Cognito]
[Search Food] --> [Amazon Elasticsearch]
[Browse Menu] --> [Amazon S3]
[View Food Details] --> [Amazon S3]
[Add to Cart] --> [Amazon DynamoDB]
[Remove from Cart] --> [Amazon DynamoDB]
[Favorite Food] --> [Amazon DynamoDB]
[Unfavorite Food] --> [Amazon DynamoDB]
[Place Order] --> [Amazon EC2]
[Fill in Personal Information] --> [Amazon Pinpoint]
[Pay] --> [Amazon SNS]
[View Order History] --> [Amazon DynamoDB]
[View Balance] --> [Amazon RDS]
[Edit Nickname] --> [Amazon RDS]

@enduml

解释：

- 客户端使用Amazon Cognito进行用户登录/注册。
- 搜索美食和浏览菜单使用Amazon Elasticsearch和Amazon S3。
- 美食详情页使用Amazon S3。
- 购物车、收藏美食、加入购物车、从购物车中删除美食使用Amazon DynamoDB。
- 下单和支付使用Amazon EC2和Amazon SNS。
- 个人信息填写使用Amazon Pinpoint。
- 历史订单使用Amazon DynamoDB。
- 用户余额和昵称使用Amazon RDS。
- VIP用户打折功能使用条件语句。
- 管理员和商家功能使用PlantUML库中的图标表示。