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简介

Axon Framework是一个用于构建CQRS（命令查询职责分离）和事件溯源（Event Sourcing）应用的框架，而Spring Boot提供了快速开发能力。二者结合可高效实现高扩展性、可维护的分布式系统。

环境准备

JDK 17+
Spring Boot 3.2+
Axon Framework 4.9+
Maven/Gradle

步骤详解

1. 创建Spring Boot项目

使用start.spring.io生成基础项目，选择：

Spring Web
Lombok（可选）

2. 添加Axon依赖

<!-- pom.xml -->
<dependency><groupId>org.axonframework</groupId><artifactId>axon-spring-boot-starter</artifactId><version>4.9.0</version>
</dependency>

3. 配置Axon（可选）

# application.yml
axon:serializer:general: jacksoneventhandling:processors:default: tracking

示例：银行账户管理

1. 定义命令(Command)

// 开户命令
public record CreateAccountCommand(String accountId, int initialBalance) {}// 存款命令
public record DepositMoneyCommand(String accountId, int amount) {}// 取款命令
public record WithdrawMoneyCommand(String accountId, int amount) {}

2. 定义事件(Event)

// 账户创建事件
public record AccountCreatedEvent(String accountId, int initialBalance) {}// 存款事件
public record MoneyDepositedEvent(String accountId, int amount) {}// 取款事件
public record MoneyWithdrawnEvent(String accountId, int amount) {}

3. 创建聚合根(Aggregate)

@Aggregate
@Getter
@NoArgsConstructor
public class BankAccountAggregate {@AggregateIdentifierprivate String accountId;private int balance;@CommandHandlerpublic BankAccountAggregate(CreateAccountCommand command) {apply(new AccountCreatedEvent(command.accountId(), command.initialBalance()));}@CommandHandlerpublic void handle(DepositMoneyCommand command) {apply(new MoneyDepositedEvent(command.accountId(), command.amount()));}@CommandHandlerpublic void handle(WithdrawMoneyCommand command) {if (balance < command.amount()) {throw new InsufficientBalanceException();}apply(new MoneyWithdrawnEvent(command.accountId(), command.amount()));}@EventSourcingHandlerpublic void on(AccountCreatedEvent event) {this.accountId = event.accountId();this.balance = event.initialBalance();}@EventSourcingHandlerpublic void on(MoneyDepositedEvent event) {balance += event.amount();}@EventSourcingHandlerpublic void on(MoneyWithdrawnEvent event) {balance -= event.amount();}
}

4. 创建Query处理

@Service
public class AccountQueryService {private final Map<String, Integer> accounts = new ConcurrentHashMap<>();@EventHandlerpublic void on(AccountCreatedEvent event) {accounts.put(event.accountId(), event.initialBalance());}@EventHandlerpublic void on(MoneyDepositedEvent event) {accounts.computeIfPresent(event.accountId(), (k, v) -> v + event.amount());}@EventHandlerpublic void on(MoneyWithdrawnEvent event) {accounts.computeIfPresent(event.accountId(), (k, v) -> v - event.amount());}@QueryHandlerpublic Integer handle(GetBalanceQuery query) {return accounts.get(query.accountId());}
}

5. 创建REST接口

@RestController
@RequestMapping("/accounts")
@RequiredArgsConstructor
public class AccountController {private final CommandGateway commandGateway;private final QueryGateway queryGateway;@PostMappingpublic CompletableFuture<String> createAccount(@RequestBody CreateAccountRequest request) {return commandGateway.send(new CreateAccountCommand(UUID.randomUUID().toString(),request.initialBalance()));}@GetMapping("/{accountId}/balance")public CompletableFuture<Integer> getBalance(@PathVariable String accountId) {return queryGateway.query(new GetBalanceQuery(accountId), Integer.class);}
}

运行与测试

启动Spring Boot应用
使用curl测试：

# 创建账户
curl -X POST -H "Content-Type: application/json" -d '{"initialBalance":1000}' http://localhost:8080/accounts# 查询余额（替换{accountId}）
curl http://localhost:8080/accounts/{accountId}/balance