订单服务，使用feign调用服务

通过feign实现订单中心（feign调用服务，在orderservice中调用product-server）

    1、copy orderserver 为orderserverfeign

    2、并使用idea打开

    3、将服务增加个feign

    在项目右键修改名称orderserver为orderserverfeign

 

    4、打开端口为8661 yml中的端口修改为8661

    5、修改各类名称refacter，并将application名字也修改正确

    6、增加依赖：

                <dependency>

             <groupId>org.springframework.cloud</groupId>

             <artifactId>spring-cloud-starter-openfeign</artifactId>

             </dependency>

    7、在Application类中增加注释

        @EnableFeignClients

    8、service中增加一个type为interface的类：ProductFeignService

        增加注解：@FeignClient(name="product-server")

            注意：name为服务定义的名称

            @FeignClient(name="PRODUCT-SERVICE") /*调用服务的名称必须和原服务名称一致，需要在服务中查找*/ 并增加一个函数，

            

                public interface ProductFeignService {

                    @GetMapping("/api/v1/product/findById") /*调用服务目录必须和原服务名称一致，需要在服务中查找*/

                    String fingById(@RequestParam(value = "id") int id);

                /**

                 * http://192.168.136.128:8766/api/v1/product/findById?id=2

                 */

                }

 

    9、增加包utils（用于解析josn字符串为json对象）

        增加类JsonUtils

         private static final ObjectMapper objectMapper =new ObjectMapper();

 

            /**

             * json字符串转换为Json格式

             */

            public static JsonNode str2JsonNode(String str){

                try {

                    return objectMapper.readTree(str);

                } catch (IOException e)

                {

                    return null;

                }

 

            }

    10、impl实现中增加

                @Autowired

                private ProductFeignService productFeignService;

                public ProductOrderFeign save(int userId, int productId) {

                //获取商品详情TODO

                String response=productFeignService.fingById(productId);

                JsonNode jsonNode=JsonUtils.str2JsonNode(response);

 

                ProductOrderFeign productOrderFeign =new ProductOrderFeign();

                productOrderFeign.setCreateTime(new Date());

                productOrderFeign.setUserId(userId);

                productOrderFeign.setProductId(productId);

                productOrderFeign.setTradeNo(UUID.randomUUID().toString());

                productOrderFeign.setProductName(jsonNode.get("name").toString());

                productOrderFeign.setPrice(Integer.parseInt(jsonNode.get("price").toString()));

 

                return productOrderFeign;；

    11、运行、访问http://192.168.136.128:8661/api/v1/orderfeign/save?userId=2&productId=2成功