<!--feign依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency> 

server:
  port: 9001

#指定注册中心地址
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:7001/eureka/

#服务的名称
spring:
  application:
    name: order-service

#自定义负载均衡策略（一般不用配用默认的）
product-service:
  ribbon:
    NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule

@SpringBootApplication
//添加@EnableFeignClients注解
@EnableFeignClients
public class OrderApplication {

    public static void main(String[] args) {
        SpringApplication.run(OrderApplication.class, args);
    }

}

@Service
public class ProductOrderServiceImpl implements ProductOrderService {

    @Autowired
    private ProductClient productClient;

    @Override
    public ProductOrder save(int userId, int productId) {

        //获取json格式的字符串数据
        String response = productClient.findById(productId);
        //Json字符串转换成JsonNode对象
        JsonNode jsonNode = JsonUtils.str2JsonNode(response);

        //将数据封装到订单实体中
        ProductOrder productOrder = new ProductOrder();
        productOrder.setCreateTime(new Date());
        productOrder.setUserId(userId);
        productOrder.setTradeNo(UUID.randomUUID().toString());
        //获取商品名称和商品价格
        productOrder.setProductName(jsonNode.get("name").toString());
        productOrder.setPrice(Integer.parseInt(jsonNode.get("price").toString()));

        //因为在商品微服务配置了集群，所以这里打印看下调用了是哪个集群节点，输出端口号。
        System.out.println(jsonNode.get("name").toString());
        return productOrder;
    }
}

/**
 * 商品服务客户端
 * name = "product-service"是服务端名称
 */
@FeignClient(name = "product-service")
public interface ProductClient {

    //这样组合就相当于http://product-service/api/v1/product/find
    @GetMapping("/api/v1/product/find")
    String findById(@RequestParam(value = "id") int id);

}

/**
 * json工具类
 */
public class JsonUtils {

    private static final ObjectMapper objectMappper = new ObjectMapper();
     //json字符串转JsonNode对象的方法
    public static JsonNode str2JsonNode(String str){
        try {
            return  objectMappper.readTree(str);
        } catch (IOException e) {
            return null;
        }
    }
}

@RestController
@RequestMapping("api/v1/order")
public class OrderController {

    @Autowired
    private ProductOrderService productOrderService;

    @RequestMapping("save")
    public Object save(@RequestParam("user_id")int userId, @RequestParam("product_id") int productId){
        return productOrderService.save(userId, productId);
    }
}