1.在order的pom中加三个依赖

feign,hystrix,actuator

1.1编辑配置类

#启用feignfeign:  hystrix:    enabled: true#裸露监控端点management:  endpoints:    web:      exposure:        include: hystrix.stream

1.2启动类加注解：@EnableFeignClients、@EnableCircuitBreaker

1.3为item和user增加申明式客户端接口和实现类

cn.tedu.sp04.feign.ItemClientcn.tedu.sp04.feign.UserClient
@FeignClient(name="item-service",fallback = ItemClientFB.class)public interface ItemClient {    //依据orderId获取商品 @GetMapping("/{orderId}" )    JsonResult<List<Item>> getItems(@PathVariable String orderId);    //缩小商品库存 @PostMapping("/decreaseNumber")    JsonResult<?> decreaseNumber(@RequestBody List<Item> items);}
@FeignClient(name="user-service",fallback =UserClientFB.class )public interface UserClient {    //获取用户，依据orderId？？？？？不对，值依据userId /* @GetMapping("{orderId}") JsonResult<User> getUser(@PathVariable String orderId); //减少用户积分，依据orderId和积分 @PostMapping("{orderId}/score") JsonResult<?> addScore(@PathVariable String orderId,Integer score);*/ @GetMapping("/{userId}")    JsonResult<User> getUser(@PathVariable Integer userId);    @PostMapping("/{userId}/score")    JsonResult<?> addScore(@PathVariable Integer userId,Integer score);}

@Componentpublic class ItemClientFB implements ItemClient{    @Override public JsonResult<List<Item>> getItems(String orderId) {        //增加缓存数据 if(Math.random()>0.5){            ArrayList<Item> list = new ArrayList<>();            list.add(new Item(1,"缓存商品1",1));            list.add(new Item(2,"缓存商品2",2));            list.add(new Item(3,"缓存商品3",3));        return JsonResult.ok().data(list);        }        return JsonResult.err("获取商品失败");    }    @Override public JsonResult<?> decreaseNumber(List<Item> items) {        return JsonResult.err("缩小商品库存失败");    }}

@Componentpublic class UserClientFB implements UserClient{    @Override public JsonResult<User> getUser(Integer userId) {        //缓存数据 if(Math.random()>0.5){            User user = new User(1,"缓存用户","缓存明码");            return JsonResult.ok().data(user);        }        return JsonResult.err("获取用户失败");    }    @Override public JsonResult<?> addScore(Integer userId, Integer score) {        return JsonResult.err("减少用户积分失败");    }}

1.4 编辑OrderServiceImpl

@Service@Slf4jpublic class OrderServiceImpl implements OrderService {    @Autowired private ItemClient itemClient;    @Autowired private UserClient userClient;    @Override public Order getOrder(String orderId) {        log.info("获取订单： orderId="+orderId);        //TODO: 近程调用商品服务，获取商品列表 JsonResult<List<Item>> items = itemClient.getItems(orderId);        //TODO: 近程调用用户服务，获取用户数据 //userClient.getUser(userId);获取用户时，id写死 JsonResult<User> user = userClient.getUser(99);        // 写死订单数据 Order order = new Order();        order.setId(orderId);        order.setUser(user.getData());        order.setItems(items.getData());        return order;    }    @Override public void saveOrder(Order order) {        log.info("保留订单： "+order);        //TODO: 近程调用商品服务，缩小商品库存 itemClient.decreaseNumber(order.getItems());        //TODO: 近程调用用户服务，减少用户积分 userClient.addScore(order.getUser().getId(),100);    }}

1.5order-service 配置启动参数,启动两台服务器

1.6启动服服，进行测试

*   依据orderid，获取订单http://localhost:8201/123abchttp://localhost:8202/123abc*   保留订单http://localhost:8201/

[http://localhost:8202/

留神：商品可能能获取到，可能获取的是缓存的，也肯获取不到。显示null。