电商系统架构实战教程

1. 系统架构设计

1.1 系统模块划分

电商系统通常包含以下核心模块：

• 用户服务：用户注册、登录、信息管理
• 商品服务：商品管理、库存管理
• 订单服务：订单创建、支付、物流
• 营销服务：优惠券、促销活动
• 支付服务：对接第三方支付
• 网关服务：统一入口、权限校验
• 后台管理：运营管理界面

1.2 技术选型

• 开发语言：Java 11+
• 框架：Spring Boot 2.7+、Spring Cloud
• 注册中心：Nacos
• 配置中心：Nacos
• 网关：Spring Cloud Gateway
• 服务调用：OpenFeign
• 负载均衡：Ribbon
• 熔断限流：Sentinel
• 消息队列：RocketMQ
• 缓存：Redis
• 数据库：MySQL
• 搜索引擎：Elasticsearch
• 分布式事务：Seata

2. 环境搭建

2.1 开发环境准备

1. 安装JDK 11+
2. 安装Maven 3.6+
3. 安装IntelliJ IDEA
4. 安装Docker和Docker Compose

2.2 基础设施部署

使用Docker Compose部署基础中间件：

version: '3'
services:# Nacos服务注册与配置中心nacos:image: nacos/nacos-server:2.0.3container_name: nacosenvironment:MODE: standaloneports:- "8848:8848"- "9848:9848"- "9849:9849"volumes:- ./nacos/logs:/home/nacos/logs- ./nacos/init.d:/home/nacos/init.d# Redis缓存redis:image: redis:6.2.6container_name: redisports:- "6379:6379"volumes:- ./redis/data:/datacommand: redis-server --appendonly yes# MySQL数据库mysql:image: mysql:8.0.26container_name: mysqlenvironment:MYSQL_ROOT_PASSWORD: rootMYSQL_DATABASE: ecom_dbports:- "3306:3306"volumes:- ./mysql/data:/var/lib/mysql- ./mysql/init:/docker-entrypoint-initdb.d# RocketMQ消息队列rocketmq:image: rocketmqinc/rocketmq:4.9.2container_name: rocketmqports:- "9876:9876"- "10909:10909"- "10911:10911"command: sh mqnamesrv && sh mqbroker -n localhost:9876# Elasticsearch搜索引擎elasticsearch:image: elasticsearch:7.17.3container_name: elasticsearchenvironment:- discovery.type=single-node- ES_JAVA_OPTS=-Xms512m -Xmx512mports:- "9200:9200"- "9300:9300"volumes:- ./elasticsearch/data:/usr/share/elasticsearch/data# Kibana可视化工具kibana:image: kibana:7.17.3container_name: kibanaports:- "5601:5601"depends_on:- elasticsearch

3. 用户服务开发

3.1 创建Maven项目

首先创建一个基础的Maven项目作为父工程：

<!-- pom.xml -->
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.ecommerce</groupId><artifactId>ecommerce-parent</artifactId><version>1.0.0</version><packaging>pom</packaging><modules><module>user-service</module><module>product-service</module><module>order-service</module><module>gateway-service</module></modules><properties><java.version>11</java.version><spring-boot.version>2.7.10</spring-boot.version><spring-cloud.version>2021.0.5</spring-cloud.version></properties><dependencyManagement><dependencies><!-- Spring Boot依赖 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-dependencies</artifactId><version>${spring-boot.version}</version><type>pom</type><scope>import</scope></dependency><!-- Spring Cloud依赖 --><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>${spring-cloud.version}</version><type>pom</type><scope>import</scope></dependency><!-- MyBatis依赖 --><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.3.1</version></dependency><!-- Nacos依赖 --><dependency><groupId>com.alibaba.nacos</groupId><artifactId>nacos-client</artifactId><version>2.0.3</version></dependency></dependencies></dependencyManagement>
</project>

3.2 创建用户服务模块

<!-- user-service/pom.xml -->
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>com.ecommerce</groupId><artifactId>ecommerce-parent</artifactId><version>1.0.0</version></parent><artifactId>user-service</artifactId><dependencies><!-- Spring Boot Starter Web --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!-- Spring Boot Starter Data JPA --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId></dependency><!-- MySQL驱动 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></dependency><!-- Nacos Discovery --><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId></dependency><!-- Sentinel --><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-sentinel</artifactId></dependency><!-- Lombok --><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><!-- Redis --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-redis</artifactId></dependency></dependencies>
</project>

3.3 配置文件

# user-service/src/main/resources/application.yml
spring:application:name: user-service  # 服务名称cloud:nacos: