java.net.ConnectException: Connection refused: connect

在使用get在postman上面输入的时候，consolo栏报错java.net.ConnectException: Connection refused: connect，难道输入的时候有错吗，另外还报接口错误

这个是controllor：

package com.ywyl.sh.mqtt.modules.mqtt.controller;

import ...
@Controller
@RequestMapping("/api/v1/iot")
public class IotController extends BaseController {
    private final static Logger logger = LoggerFactory.getLogger(IotController.class);

    @Autowired
    IotService iotService;

    @Autowired
    DeviceService deviceService;

    @Autowired
    UrlConfigBean urlConfigBean;

    @Value("${jwt.token}")
    String token;

    @GetMapping("getToken")
    public @ResponseBody
    String getToken(HttpServletRequest httpServletRequest) throws Exception {
        return toJson(iotService.getToken(),httpServletRequest);
    }

    @GetMapping("insertMachines")
    public @ResponseBody Object insertMachines(@RequestParam("machineId")String machineId,
                                               HttpServletRequest request) throws Exception {
        System.out.println(token);
        CommResponse<IotMachineResultDto> result = new Gson().fromJson(HttpRequestUtil.sendGet(urlConfigBean.getBackUrlHead()+urlConfigBean.getCrud()+"api/v1/machine/insertMachines","machineId="+machineId,token,1),CommResponse.class);
        if (result.getStatus()==1){
            return toJson("添加设备失败或设备ID重复",request);
        }
        return result.getBody();
    }

    @ApiOperation("订阅")
    @GetMapping("subDevice")
    public @ResponseBody String subDevice(HttpServletRequest request) throws Exception {
        return toJson(iotService.createSub(),request);
    }

    @PostMapping("getDeviceData")
    public @ResponseBody String getDeviceData(@RequestBody Map map,
                                              HttpServletRequest request) throws Exception {
        Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss").create();
        iotService.getDeviceData(map);
        return toJson("insertDevice",request);
    }

}