springcloudfeign 원격 호출 서비스 실천

1. 다음 단계는feign 원격 서비스 호출을 실현하는 것이다

// - （provider）, ID:user-service
@RestController
@RequestMapping("user")
class UserController implements  UserFacade{

    @Autowired
    @Qualifier("userServiceImpl")
    UserService userService;

    @RequestMapping("getUserById")
    @Override
    public User getUserById(@RequestParam("userId") String userId) {
        return userService.getUserById(userId);
    }

    @RequestMapping("saveUser")
    @Override
    public User saveUser(@RequestBody User user) {
        return userService.saveUser(user);
    }
}


interface UserService {
     User getUserById(String userId);
     User getUserByUserName(String userName);
     User saveUser(User user);
}

@Service
class UserServiceImpl implements UserService {

    @Override
    public User getUserById(String userId) {
        System.out.println(" ID ");
        return null;
    }

    @Override
    public User getUserByUserName(String userName) {
        System.out.println(" ");
        return null;
    }

    @Override
    public User saveUser(User user) {
        System.out.println(" ");
        return null;
    }

}

// - （consumer）， ID：product-service
// 

/**
 * @ClassName ProductController
 * @Description feign 
 * @Author Neal
 * @Date 2019/4/29 14:47
 * @Version 1.0
 */
@RestController
@RequestMapping("product")
 class ProductController{

    @Autowired
    private UserFeign userFeign;

    @RequestMapping("getUserProduct")
    public String getUserProduct(@RequestParam("userId") String userId) {
        // 
        User user = userFeign.getUserById(userId);
        // ....
        return null;
    }

}


// 
@FeignClient(name = "user-service")
 interface UserFeign extends UserFacade{

    // ， 
    @GetMapping(value = "/user/getUserById",consumes = MediaType.APPLICATION_JSON_VALUE)
    User getUserById(String userId);

    // ， 
    @PostMapping(value = "/user/saveUser",consumes = MediaType.APPLICATION_JSON_VALUE)
    User saveUser(@RequestBody User user);
}

// ( )
interface UserFacade {
    @GetMapping(value = "/user/getUserById",consumes = MediaType.APPLICATION_JSON_VALUE)
    User getUserById(String userId);

    @PostMapping(value = "/user/saveUser",consumes = MediaType.APPLICATION_JSON_VALUE)
    User saveUser(@RequestBody User user);
}

 pom.xml ， 

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

 ：register( ) -> provider( ：user-service) -> consumer( ：product-service)
 ：http://localhost:9090