java - 从 JSON 读取数据

Question

这是我的 JSON 响应

{
  "data": [
    {
      "id": "txn_17pHAkI4mX5ntfze4If5wIxW",
      "source": "tr_17pHAkI4mX5ntfzeIfNucubD",
      "amount": -100000,
      "currency": "usd",


    },
    {
      "id": "txn_17pH21I4mX5ntfzesrhdZwyf",
      "source": "tr_17pH21I4mX5ntfzeKLd0SWw0",
      "amount": -100000,

    },
    {
      "id": "txn_17pGVRI4mX5ntfzeBQPCWZZg",
      "source": "tr_17pGVRI4mX5ntfzegJNe1r4o",
      "amount": -100000,
      "currency": "usd"  
    }
  ],

  },
  "url": "/v1/balance/history",
  "count": null
}

我想从这三个列表中获取“金额”和“id”。如何用java实现呢？

Answer 1

查看Google's Gson .

您需要创建一个表示 json 数据的类。

class Response {
    class Data {
        public String id;
        public String source;
        public int amount;
        public String currency;
    }
    public Data[] data;
    public String url;
    public int count;
}

然后将数据读入变量。

String json = "your json here";
Gson gson = new Gson();
Response response = gson.fromJson(json, Response.class);
for(Data d : response.data) {
    System.out.println(d.id);
    System.out.println(d.amount);
}