spring-cloud-alibaba

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• SKILL.md
• openai.yaml · agents/

SKILL.md (first lines)

# Spring Cloud Alibaba 开发指南

## 概述

Spring Cloud Alibaba 是阿里巴巴提供的微服务解决方案，提供了 Nacos（服务注册与配置）、Sentinel（流量控制）、RocketMQ（消息队列）、Seata（分布式事务）等组件。

## 核心组件

### 1. Nacos（服务注册与配置中心）

**Nacos Server 安装**：

```bash
# 下载 Nacos
wget https://github.com/alibaba/nacos/releases/download/2.2.0/nacos-server-2.2.0.tar.gz

# 解压并启动
tar -xzf nacos-server-2.2.0.tar.gz
cd nacos/bin
sh startup.sh -m standalone
```

**服务注册**：

```java
@SpringBootApplication
@EnableDiscoveryClient
public class UserServiceApplication {
    public static void main(String[] args) {
        SpringApplication.run(UserServiceApplication.class, args);
    }
}
```

**application.yml**：

```yaml
spring:
  application:
    name: user-service
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
        namespace: dev
        group: DEFAULT_GROUP
```

**配置管理**：

```yaml
spring:
  cloud:
    nacos:
      config:
        server-addr: localhost:8848
        file-extension: yaml
        namespace: dev
        group: DEFAULT_GROUP
        shared-configs:
          - data-id: common-config.yaml
            group: DEFAULT_GROUP
            refresh: true
```

**动态配置刷新**：

```java
@RestController
@RefreshScope
public class ConfigController {
    @Value("${app.name:default}")
    private String appName;

    @GetMapping("/config")
    public String getConfig() {
        return appName;
    }
}
```

### 2. Sentinel（流量控制）

**依赖**：

```xml
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
</dependency>
```

**配置**：

```yaml
spring:
  cloud:
    sentinel:
      transport:
        dashboard: localhost:8080
        port: 8719
      datasource:
        flow:
          nacos:
            server-addr: localhost:8848
            dataId: ${spring.application.name}-flow-rules
            groupId: SENTINEL_GROUP
            rule-type: flow
```

**流量控制**：

```java
@Service
public class UserService {
    @SentinelResource(value = "getUser", blockHandler = "getUserBlockHandler")
    public User getUser(Long id) {
        return userRepository.findById(id)
            .orElseThrow(() -> new UserNotFoundException(id));
    }

From full-stack-skills/spring-skills, Apache-2.0.

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