Question

我想从不包含双引号的JSONObject中提取JSONArray。

HTTP响应实体如下。

{"asks":[["107.47649000",25.3039]],"bids":[["107.06385000",64.9317]],"isFrozen":"0","seq":298458396}

具体来说，我需要同时提取107.4764900和25.3039。但是，值25.3039不包含双引号。

我的代码在下面

    public static void bid_ask () throws ClientProtocolException, IOException {
    String queryArgs = "https://poloniex.com/public?command=returnOrderBook&currencyPair=USDT_ETH&depth=1";
    CloseableHttpClient httpClient = HttpClients.createDefault();
    HttpPost post = new HttpPost(queryArgs);
    CloseableHttpResponse response = httpClient.execute(post);
    HttpEntity responseEntity = response.getEntity();
    System.out.println("Poloniex ETHUSDT");
    //System.out.println(response.getStatusLine());


    if (responseEntity != null) {
        try (InputStream stream = responseEntity.getContent()) {
             BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
             String line;

             while ((line = reader.readLine()) != null) {
                System.out.println(line);

                JSONObject jsonObj = new JSONObject(line);
                JSONArray tokenListBid = jsonObj.getJSONArray("bids");
                JSONArray tokenListAsk = jsonObj.getJSONArray("asks");
                JSONArray bid_element;
                JSONArray ask_element;
                double bid[] = new double[2];
                double ask[] = new double[2];

               System.out.println("Poloniex Bid");
                if (tokenListBid != null) { 
                   for (int i=0;i<2;i++){
                      bid_element = tokenListBid.getJSONArray(i);
                      bid[i]=bid_element.getBigDecimal(i).doubleValue();
                      System.out.println(bid[i]);
                   } 
                }


             } //end while()
        }
    }

结果显示如下

Poloniex出价 107.06385

线程“ main” org.json.JSONException中的异常：找不到JSONArray [1]。

谢谢。

Answer 1

将内部数组视为Object数组，并根据需要进行类型转换。
这是解析“请求”部分的简化示例

JSONObject jsonObj = new JSONObject(line);
JSONArray asks = jsonObj.getJSONArray("asks").getJSONArray(0);
Double ask = 0.0;
for (Object o : asks) {
    if (o instanceof String){
        ask = Double.valueOf((String)o);
    } else {
        ask = (Double)o;
    }
    //do something with ask
}

更新
这是另一种访问数据的方法

JSONObject jsonObj = new JSONObject(line);
SONArray asks = jsonObj.getJSONArray("asks").getJSONArray(0);

Double price = Double.valueOf(asks.getString(0));
Double qty = Double.valueOf(asks.getDouble(1));

System.out.printf("Ask price: %.6f, quantity %.4f", price, qty);

这是我用来测试代码的字符串

String json = "{\"asks\":[[\"107.47649000\",25.3039]],\"bids\":[[\"107.06385000\",64.9317]],\"isFrozen\":\"0\",\"seq\":298458396}";

这就是我得到的结果

要价：107.476490，数量25.3039

Answer 2

[["107.06385000",64.9317]]是一个1*2数组，tokenListBid引用了它。因此，您无法使用tokenListBid.getJSONArray(1);对其进行索引。

从不包含双引号的JSONObject中提取JSONArray

2 个答案: