cannot be cast to java.lang.String-蒲公英云

cannot be cast to java.lang.String

你的名字 2024-03-22 10:19 35阅读 0赞

这个错误通常发生在Redis操作时，将非String类型的值存储到Redis中，但是在获取时尝试将其转换为String类型

这里创建对象然后添加进List集合中，将集合转换为Map 将整个Map集合存入redis中

List<VehicleRegistrationPlaceCode> vehicleRegistrationPlaceCodes = new ArrayList<>();
        vehicleRegistrationPlaceCodes.add(new VehicleRegistrationPlaceCode(1L,"冀A","石家庄","河北","HB","130100","130000"));
        vehicleRegistrationPlaceCodes.add(new VehicleRegistrationPlaceCode(1L,"冀B","唐山","河北","HB","130200","130000"));
        vehicleRegistrationPlaceCodes.add(new VehicleRegistrationPlaceCode(1L,"冀C","秦皇岛","河北","HB","130300","130000"));
        vehicleRegistrationPlaceCodes.add(new VehicleRegistrationPlaceCode(1L,"冀D","邯郸","河北","HB","130400","130000"));
        Map<String, VehicleRegistrationPlaceCode> collect = vehicleRegistrationPlaceCodes.stream()
                .collect(Collectors.toMap(VehicleRegistrationPlaceCode::getPlatePrefix, Function.identity()));
        redisTemplate.boundHashOps("vehicleRegionCode").putAll(collect);

这样直接存入就会报 cannot be cast to java.lang.String 错误

将对象转换为json格式重新存入redis中程序正常运行

redisTemplate.boundHashOps("vehicleRegionCode").put(vehicleRegistrationPlaceCode.getPlatePrefix(),JSONObject.toJSONString(vehicleRegistrationPlaceCode));