从 JSONObject 响应中提取数据

Question

我收到以下回复，我正在尝试提取 sale 和 related_resources 下的 id。

到目前为止，我已经尝试用下面的方法检索这个 id，但我认为我试图两次获取一个数组而走错了路（原因是他们前面有一个 [。

confirm.toJSONObject().getJSONObject("response").getJSONArray("transactions").getJSONArray("related_resources")

Eclipse 然后显示以下消息The method getJSONArray(int) in the type JSONArray is not applicable for the arguments (String)提取所需数据的正确方法是什么？

{
  "id": "PAY-17S8410768582940NKEE66EQ",
  "create_time": "2013-01-31T04:12:02Z",
  "update_time": "2013-01-31T04:12:04Z",
  "state": "approved",
  "intent": "sale",
  "payer": {
    "payment_method": "credit_card",
    "funding_instruments": [
      {
        "credit_card": {
          "type": "visa",
          "number": "xxxxxxxxxxxx0331",
          "expire_month": "11",
          "expire_year": "2018",
          "first_name": "Betsy",
          "last_name": "Buyer",
          "billing_address": {
            "line1": "111 First Street",
            "city": "Saratoga",
            "state": "CA",
            "postal_code": "95070",
            "country_code": "US"
          }
        }
      }
    ]
  },
  "transactions": [
    {
      "amount": {
        "total": "7.47",
        "currency": "USD",
        "details": {
          "tax": "0.03",
          "shipping": "0.03"
        }
      },
      "description": "This is the payment transaction description.",
      "related_resources": [
        {
          "sale": {
            "id": "4RR959492F879224U",
            "create_time": "2013-01-31T04:12:02Z",
            "update_time": "2013-01-31T04:12:04Z",
            "state": "completed",
            "amount": {
              "total": "7.47",
              "currency": "USD"
            },
            "parent_payment": "PAY-17S8410768582940NKEE66EQ",
            "links": [
              {
                "href": "https://api.sandbox.paypal.com/v1/payments/sale/4RR959492F879224U",
                "rel": "self",
                "method": "GET"
              },
              {
                "href": "https://api.sandbox.paypal.com/v1/payments/sale/4RR959492F879224U/refund",
                "rel": "refund",
                "method": "POST"
              },
              {
                "href": "https://api.sandbox.paypal.com/v1/payments/payment/PAY-17S8410768582940NKEE66EQ",
                "rel": "parent_payment",
                "method": "GET"
              }
            ]
          }
        }
      ]
    }
  ],
  "links": [
    {
      "href": "https://api.sandbox.paypal.com/v1/payments/payment/PAY-17S8410768582940NKEE66EQ",
      "rel": "self",
      "method": "GET"
    }
  ]
}

更新：我现在可以提取销售 ID，但感觉就像一个 hack。有没有更好的办法：

            JSONObject obj = new JSONObject(input.toString());

        String temp = obj.getJSONArray("transactions").getJSONObject(0)
                .getJSONArray("related_resources").getJSONObject(0)
                .toString();

        JSONObject obj2 = new JSONObject(temp);
        String temp2 = obj2.getJSONObject("sale").getString("id");

        System.out.println(temp);
        System.out.println(temp2);

Answer 1

getJSONArray("transactions") returns 一个数组。您只能通过其位置从数组中获取对象。所以你需要先获取索引为 0 的对象（数组中的第一个对象），然后你可以调用 getJSONArray("related_resources")

我不是真正的 Java 程序员，但我猜 .get(0) 会成功。

找到错误位置的一种简单方法是将每个部分拆分为自己的 var 并打印它们。

Array transactions = getJSONArray("transactions");
Log.v(0, transactions);
Array related = transactions.get(0).getJSONArray("related_resources");
Log.v(0, related);

从 JSONObject 响应中提取数据

Extract data from a JSONObject response

java

json