将字符串转换为JSON数组

Question

将字符串转换为JSON数组我从Web服务获得以下字符串的JSON，并尝试将其转换为 JSONarray{     "locations": [         {             "lat": "23.053",             "long": "72.629",             "location": "ABC",             "address": "DEF",             "city": "Ahmedabad",             "state": "Gujrat",             "phonenumber": "1234567"         },         {             "lat": "23.053",             "long": "72.629",             "location": "ABC",             "address": "DEF",             "city": "Ahmedabad",             "state": "Gujrat",             "phonenumber": "1234567"         },         {             "lat": "23.053",             "long": "72.629",             "location": "ABC",             "address": "DEF",             "city": "Ahmedabad",             "state": "Gujrat",             "phonenumber": "1234567"         },         {             "lat": "23.053",             "long": "72.629",             "location": "ABC",             "address": "DEF",             "city": "Ahmedabad",             "state": "Gujrat",             "phonenumber": "1234567"         },         {             "lat": "23.053",             "long": "72.629",             "location": "ABC",             "address": "DEF",             "city": "Ahmedabad",             "state": "Gujrat",             "phonenumber": "1234567"         }     ]}我在String网上验证了这一点，似乎是正确的。现在我在android开发中使用以下代码来利用JSONArray jsonArray = new JSONArray(readlocationFeed);这会抛出异常类型不匹配的异常。

Answer 1

在这里你得到JSONObject所以改变这一行：

JSONArray jsonArray = new JSONArray(readlocationFeed);

以下内容：

JSONObject jsnobject = new JSONObject(readlocationFeed);

之后

JSONArray jsonArray = jsnobject.getJSONArray("locations");for (int i = 0; i < jsonArray.length(); i++) {
    JSONObject explrObject = jsonArray.getJSONObject(i);}

Answer 2

输入字符串

[
   {
      "userName": "sandeep",
      "age": 30
   }, 
   {
      "userName": "vivan",
      "age": 5
   }]

将字符串转换为JSON的简单方法

public class Test{

    public static void main(String[] args) throws JSONException
    {
        String data = "[{\"userName\": \"sandeep\",\"age\":30},{\"userName\": \"vivan\",\"age\":5}]  ";
        JSONArray jsonArr = new JSONArray(data);

        for (int i = 0; i < jsonArr.length(); i++)
        {
            JSONObject jsonObj = jsonArr.getJSONObject(i);

            System.out.println(jsonObj);
        }

    }}

产量

{"userName":"sandeep","age":30}{"userName":"vivan","age":5}

Answer 3

使用json lib： -

String data="[{"A":"a","B":"b","C":"c","D":"d","E":"e","F":"f","G":"g"}]";Object object=null;JSONArray arrayObj=null;JSONParser jsonParser=new JSONParser();object=jsonParser.parse(data);arrayObj=(JSONArray) object;System.out.println("Json object :: "+arrayObj);

使用GSON lib： -

Gson gson = new Gson();String data="[{\"A\":\"a\",\"B\":\"b\",\"C\":\"c\",\"D\":\"d\",\"E\":\"e\",\"F\":\"f\",\"G\":\"g\"}]";JsonParser jsonParser = new JsonParser();JsonArray jsonArray = (JsonArray) jsonParser.parse(data);