SpringBoot工程下使用OpenFeign的坑及解决

public interface UserFeign { 
    /**
     * 根据userId获取用户信息
     * @param userId
     * @return
     */
    @RequestLine("GET /user/getUserById?id={id}")
    Result getUserById(@Param("id") String userId);
}

@Service
public class UserService{ 
    /**
     * 通过OpenFegin实现接口调用接口
      * @param userId
     * @return
     */
    public Result getUserByIdWith(String userId) {
        UserFeign userInfo = Feign.builder()
                .decoder(new JacksonDecoder())
                .target(UserFeign.class, "http://localhost:8080");
        Result res = userInfo.getUserById(userId);
        return res;
    }
}

@RequestMapping(value = "/test", method = RequestMethod.GET)
public Result test() {
    String id = "ad545461300a";
    return userService.getUserByIdWith(id);
}

@RequestMapping(value = "/getUserById", method = RequestMethod.GET)
public Result getUserByUserId(@RequestParam(required = true) String id){
    if ("".equals(id)) {
        throw new BusinessException(400, "userId不能为空!");
    }
    Users info = usersService.getUserById(id);
    if (info == null) {
        throw new BusinessException(404, "userId有误!");
    }
    return ResultUntil.success(info);
}

@Bean
public Contract useFeignAnnotations() {
    return new Contract.Default();
}