1

在我的 Java 应用程序中，我有一个很长的 JSON 字符串，其中包含我想要提取的数据。

[["19:05",2,"","19.3","26.7","74","1003.6","3.2","236.0","00 : 05 : 43","01 : 54 : 17","","","",null,"rain"],{"1":["2",3,"0","","","","","0","","4713","M",1],"2":["3",3,"0","","","","","0","","4714","M",1],"3":["3681",3,"0","","","","","0","","4715","M",1],"4":["28",4,"0","","","","","0","","4716","M",1],"5":["7",4,"0","","","","","1","","4717","M",1],"6":["13",3,"0","","","","","0","","4718","M",1],"7":["35",4,"0","","","","","0","","4719","M",0],"8":["82",4,"0","","","","","0","","4720","M",1],"9":["44",4,"0","","","","","0","","4721","D",1],"10":["193",4,"0","","","","","0","","4722","D",1],"11":["3347",3,"0","","","","","0","","4723","D",1],"12":["144",4,"0","","","","","0","","4724","D",1],"13":["90",4,"0","","","","","0","","4726","D",0],"14":["89",4,"0","","","","","1","","4727","D",1],"15":["3582",2,"1","","","","5:36.746","0","","4728","D",1],"16":["64",4,"0","","","","","0","","4729","M",0],"17":["78",4,"0","","","","","0","","4730","D",0],"18":["3577",4,"0","","","","","0","","4731","D",1],"19":["38",3,"0","","","","","0","","4732","M",0],"20":["3686",3,"0","","","","","0","","4733","D",0],"21":["1351",4,"0","","","","","0","","4772","D",0],"22":["3689",4,"0","","","","","0","","4734","D",0],"23":["104",4,"0","","","","","0","","4735","D",1],"24":["3693",4,"0","","","","","0","","4736","D",1],"25":["249",4,"0","","","","","0","","4769","D",0],"26":["16",4,"0","","","","","0","","4738","D",1],"27":["171",4,"0","","","","","0","","4739","D",0],"28":["3670",4,"0","","","","","0","","4740","M",0],"29":["3588",4,"0","","","","","0","","4741","D",0],"30":["77",4,"0","","","","","0","","4742","M",1],"31":["151",4,"0","","","","","0","","4755","M",1],"32":["53",4,"0","","","","","0","","4743","M",1],"33":["267",4,"0","","","","","0","","4751","M",0],"34":["3671",4,"0","","","","","0","","4756","M",1],"35":["155",4,"0","","","","","0","","4757","M",1],"36":["153",4,"0","","","","","0","","4758","M",1],"37":["3672",4,"0","","","","","0","","4759","M",1],"38":["3328",4,"0","","","","","0","","4744","D",0],"39":["130",4,"0","","","","","0","","4760","M",1],"40":["3677",4,"0","","","","","0","","4761","M",1],"41":["97",4,"0","","","","","0","","4745","M",1],"42":["101",4,"0","","","","","0","","4746","M",0],"43":["102",3,"0","","","","","0","","4747","M",0],"44":["40",3,"0","","","","","0","","4819","M",0],"45":["129",4,"0","","","","","0","","4762","M",1],"46":["2777",4,"0","","","","","0","","4763","M",0],"47":["3352",4,"0","","","","","0","","4764","M",1],"48":["169",4,"0","","","","","0","","4765","M",1],"49":["120",4,"0","","","","","0","","4748","M",1],"50":["137",3,"0","","","","","0","","4749","M",1],"51":["3678",4,"0","","","","","0","","4750","M",0],"52":["87",3,"0","","","","","0","","4766","M",1],"53":["299",3,"0","","","","","0","","4767","M",1],"54":["19",3,"0","","","","","0","","4752","M",1],"55":["333",4,"0","","","","","1","","4753","M",1],"56":["81",3,"0","","","","","0","","4754","M",1]}]

我想提取的是此表单下字符串的对象部分（括号之间），"56":["81",3,"0","","","","","0","","4754","M",1]并从中获取所有这些数据："81",3,"0","","","","","0","","4754","M",1并能够访问它们的编号。

为此，我已经尝试过：

for(int i = 1; i > 0; i++) {
    String d;
    try {
        d = data.split("\"" + i + "\"\\:\\[")[1];
        d = d.split("\\]")[0];
    } catch(Exception e) {
        e.printStackTrace();
        System.out.println("quit");
        break;
    }
}

问题是我得到了一个数组越界异常，以及一个 insta-quit from this data.split("\"" + i + "\"\\:\\[")[1]。我的猜测是我把正则表达式弄乱了，但我真的看不出在哪里。谢谢你的帮助。

4

3 回答 3

4

更好地使用 JSON Java 库。它真的会为你简化解析。这是一个示例，说明如何提取所需的最后一个数组并将其所有值打印到控制台。

final JSONArray root = new JSONArray(YOUR_JSON_STRING);

final JSONObject numData = root.getJSONObject(1);
final JSONArray numArray = numData.getJSONArray("56");

for (int i = 0; i < numArray.length(); ++i) {
  if (i == 1 || i == 11)
      System.out.print(numArray.getInt(i)+",");
  else
      System.out.print(numArray.getString(i)+",");
}
// prints: "81",3,"0","","","","","0","","4754","M",1,

参考：
JSON Java API 文档

于 2013-06-20T19:32:48.917 回答
2

JSON 数据应该使用JSON 解析器提取，而不是使用正则表达式或任何其他类型的低级字符串处理代码。

于 2013-06-20T19:19:47.067 回答
2

看起来您永远不会退出 FOR 语句，因为它缺少上限。

for(int i = 1; i > 0; i++)

只要“i > 0”，FOR 语句就会继续运行，并且你已经从 1 开始 i 并且你不断地增加它，所以它永远不会小于或等于零。

如果您可以使用 array.length 或其他方法获取数组大小并将 FOR 语句更改为：

for(int i = 1; i > array.length; i++)

这可能会解决问题。

于 2013-06-20T19:23:40.730 回答