SpringCloud Nacos 服务注册发现与配置中心实战 | 极客日志

SpringCloud Nacos 服务注册发现与配置中心实战 | 极客日志

<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>

spring:
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848

@Service
public class OrderService {
    private final OrderMapper orderMapper;
    private final RestTemplate restTemplate;

    @Autowired
    public OrderService(OrderMapper orderMapper, RestTemplate restTemplate) {
        this.orderMapper = orderMapper;
        this.restTemplate = restTemplate;
    }

    public OrderInfo selectOrderById(Integer id) {
        OrderInfo orderInfo = orderMapper.selectOrderById(id);
        String url = "http://127.0.0.1:9000/product/getProductById?id=" + orderInfo.getProductId();
        ProductInfo productInfo = restTemplate.getForObject(url, ProductInfo.class);
        orderInfo.setProductInfo(productInfo);
        return orderInfo;
    }
}

@Configuration
public class BeanConfig {
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-loadbalancer</artifactId>
</dependency>

@Configuration
public class BeanConfig {
    @Bean
    @LoadBalanced
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

@Service
public class OrderService {
    private final OrderMapper orderMapper;
    private final RestTemplate restTemplate;

    @Autowired
    public OrderService(OrderMapper orderMapper, RestTemplate restTemplate) {
        this.orderMapper = orderMapper;
        this.restTemplate = restTemplate;
    }

    public OrderInfo selectOrderById(Integer id) {
        OrderInfo orderInfo = orderMapper.selectOrderById(id);
        // 使用服务名代替 IP
        String url = "http://product-service/product/getProductById?id=" + orderInfo.getProductId();
        ProductInfo productInfo = restTemplate.getForObject(url, ProductInfo.class);
        orderInfo.setProductInfo(productInfo);
        return orderInfo;
    }
}

# 在服务消费者 order-service 的 yml 文件中添加如下配置 -> 开启负载均衡策略
spring:
  cloud:
    loadbalancer:
      nacos:
        enabled: true

spring:
  cloud:
    nacos:
      discovery:
        cluster-name: cluster-beijing

spring:
  cloud:
    nacos:
      discovery:
        ephemeral: false

spring:
  cloud:
    nacos:
      discovery:
        namespace: 0bec5adc-2787-44b0-b826-e4bb48746c4e

<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>

spring:
  application:
    name: order-service
  profiles:
    active: local
  cloud:
    nacos:
      config:
        server-addr: 127.0.0.1:8848
        namespace: 0bec5adc-2787-44b0-b826-e4bb48746c4e
        file-extension: yaml
      discovery:
        server-addr: 127.0.0.1:8848
        ephemeral: true
        namespace: 0bec5adc-2787-44b0-b826-e4bb48746c4e

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-bootstrap</artifactId>
</dependency>

Data ID = ${prefix} - ${spring.profiles.active} . ${file-extension}

@RestController
@RequestMapping("/config")
@RefreshScope // 当 Nacos 中的配置发生变化时，被@RefreshScope 标注的 Bean 会重新创建，从而加载新的配置值
@Slf4j
public class NacosConfigController {
    @Value("${test.value}")
    private String value;

    @GetMapping("/getValue")
    public void getValue() {
        log.info("getValue:{}", value);
    }
}