Spring Boot 2 中的 FeignClient

使用 Spring Boot 2 中的 FeignClient 进行服务间的通信

xml
    
        org.springframework.cloud
        spring-cloud-starter-openfeign
    

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

java
@FeignClient(value = "service-name")
public interface MyFeignClient {
    // 定义需要调用的方法
}

java
@FeignClient(value = "service-name")
public interface MyFeignClient {
    @RequestMapping(value = "/api/users/{id}", method = RequestMethod.GET)
    User getUserById(@PathVariable("id") Long id);
}

java
@RestController
public class UserController {
    @Autowired
    private MyFeignClient myFeignClient;
    @GetMapping("/users/{id}")
    public User getUserById(@PathVariable Long id) {
        return myFeignClient.getUserById(id);
    }
}

java
@RestController
public class UserController {
    @GetMapping("/api/users/{id}")
    public User getUserById(@PathVariable Long id) {
        // 根据用户 ID 查询用户信息
        return userService.getUserById(id);
    }
}

java
@FeignClient(value = "user-service")
public interface UserFeignClient {
    @RequestMapping(value = "/api/users/{id}", method = RequestMethod.GET)
    User getUserById(@PathVariable("id") Long id);
}
@RestController
public class OrderController {
    @Autowired
    private UserFeignClient userFeignClient;
    @GetMapping("/api/orders/{id}")
    public Order getOrderById(@PathVariable Long id) {
        // 根据订单 ID 查询订单信息
        Order order = orderService.getOrderById(id);
        // 调用用户服务获取用户信息
        User user = userFeignClient.getUserById(order.getUserId());
        order.setUser(user);
        return order;
    }
}