杰克逊 - 使用动态密钥对json进行序列化

I have the following JSON:

我有以下JSON：

{
  "2016-01-23": {
    "downloads": 4,
    "re_downloads": 1,
    "updates": 0,
    "returns": 0,
    "net_downloads": 4,
    "promos": 0,
    "revenue": "0.00",
    "returns_amount": "0.00",
    "edu_downloads": 0,
    "gifts": 0,
    "gift_redemptions": 0,
    "date": "2016-01-23"
  },
  "2016-01-24": {
    "downloads": 1,
    "re_downloads": 1,
    "updates": 0,
    "returns": 0,
    "net_downloads": 1,
    "promos": 0,
    "revenue": "0.00",
    "returns_amount": "0.00",
    "edu_downloads": 0,
    "gifts": 0,
    "gift_redemptions": 0,
    "date": "2016-01-24"
  }
}
{
  "2