java - 如何使用 Feign Client Spring Boot 从另一个服务获取数据(错误 : 406)

Question

当我使用 Feign 客户端从一项服务(API 网关)调用另一项服务(用户服务)时，出现错误

有两个服务

1. 用户服务
2. API 网关

在我的 API 网关

FeignClient

@FeignClient(contextId = "user-by-email",name = "user-service")
@Service
public interface UserByEmail {
    @RequestMapping(value = "/email/{email}", consumes= MediaType.APPLICATION_JSON_VALUE)
    User findByEmail(@PathVariable("email") String email);
}

Controller

@RequestMapping("/test")
public class TestController {
    @Autowired
    private UserByEmail userByEmail;

    @GetMapping(value = "/{email:.+}")
    public ResponseEntity testUser(@PathVariable("email") String username) {
        return ResponseEntity.ok(userByEmail.findByEmail(username));
    }
}

我需要调用以下(用户服务)

Controller

@EnableFeignClients
@RestController
public class UserController extends BaseController<User> {
    @Autowired
    private UserService userService;

    @PostConstruct
    public void binder() {
        init(this.userService);
    }

    @GetMapping(value = "/email/{email}")
    public ResponseEntity findByEmail(@PathVariable("email") String email) {
        return ResponseEntity.ok(userService.findByEmail(email));
    }
}

存储库

@Override
public User findByEmail(String email) {
  Query query = new Query(Criteria.where("email").is(email).and("status").is(1));
  return mongoOperations.findOne(query, User.class);
}

服务

@Override
public User findByEmail(String email) {
  return userDao.findByEmail(email);
}

我收到的错误是..

<Map>
    <timestamp>1583924335777</timestamp>
    <status>406</status>
    <error>Not Acceptable</error>
    <message>Could not find acceptable representation</message>
    <trace>org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation&#xd;
    at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:246)&#xd;

任何人都可以解释一下我的代码有什么问题，并提供您宝贵的解决方案

(基本上我需要在API网关中创建Security，以控制其他服务的访问)

Answer 1

尝试如下实现 Feign 客户端:

@FeignClient(name = "user-service")
public interface UserByEmail {

 @RequestMapping(method = RequestMethod.GET, value = "/email/{email}", consumes = "application/json")
 User findByEmail(@PathVariable("email") String email);

 }

还要确保字段通过 JSON 匹配器 User POJO 传递。