如何解析 JSON 以便我可以遍历元素

Question

下面是我从 WebService 响应中获取的给定字符串。

{
    "tag": "fetchdwnDetailStatus",
    "status": true,
    "downloadDetails": "[\"[9164666666, 20171001, MADAN LAL CHOURISYA, 16, 1342.6]\",\"[9868476619, 20171001, RAHUL JAIN\\/CHUNNILAL JAIN, 50, 121]\",\"[9173666666, 20171001, SHRI BALKRISHAN \\/ DHARMLAL KUR, 13, 3246]\",\"[9833216286, 20171001, SMT CHANDA JAIN\\/SHRI CHANDMAL , 50, 4502.23]\",\"[7073016885, 20171001, MAHESH KUMAR \\/ BRAJLAL KUSHWAH, 48, 1560.8]\"]"
}

我想遍历 downloadDetails 的每个元素，并想在屏幕上显示。

到目前为止我做到了

JSONObject jObj = new JSONObject(response);
if(jObj!=null)
{                         
    arrayFromStringDD = jObj.getJSONArray("downloadDetails");
    try {        
            JSONArray jsonArray = arrayFromStringDD;
            List<String> list = new ArrayList<String>();
            for (int j=0; j<jsonArray.length(); j++) {
               System.out.println("adding in list==>"+ jsonArray.getString(j));
                list.add( jsonArray.getString(j) );
            } 
     }catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
     }                          
}

我在第 arrayFromStringDD = jObj.getJSONArray("downloadDetails"); 行收到的不是原始类型错误请帮助

编辑： 正如 post 中所建议的，这是字符串而不是数组。所以我试过了。

JsonParser jsonParser = new JsonParser();
JsonArray arrayFromStringDD = jsonParser.parse((String) jObj.getString("downloaddata")).getAsJsonArray();
 try {        
            JSONArray jsonArray = arrayFromStringDD; //here I am getting error while converting...
            List<String> list = new ArrayList<String>();
            for (int j=0; j<jsonArray.length(); j++) {
               System.out.println("adding in list==>"+ jsonArray.getString(j));
                    list.add( jsonArray.getString(j) );
                } 
             }catch (JSONException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

Answer 1

Retrofit Library 将使您的生活更轻松。它支持 JSON 到 java 对象转换。 http://square.github.io/retrofit/

Answer 2

您的 downloadDetails 是字符串类型而不是数组，因为它包含在 "" 中。因此，当您尝试将 String 转换为 ArrayObject 时，您会收到错误

查看下面的示例并将其与您的 json 进行比较：

{
"name":"John",
"age":30,
"cars":[ "Ford", "BMW", "Fiat" ]
}

Answer 3

试试这个

JSONObject jObj = new JSONObject(response);
if(jObj!=null)
{                         

try 
{

     String downloadDetails = jObj.getString("downloadDetails");

     String jsonFormattedString = downloadDetails.replaceAll("\\", "");

     JSONArray jsonArray = new JSONArray(jsonFormattedString);

     for (int i = 0; i < jsonArray.length(); i++) {

         System.out.println("adding in list==>"+ jsonArray.getString(i));
     }

}
catch (JSONException e) 
{
      // TODO Auto-generated catch block
      e.printStackTrace();
}

输出

编辑

JSONObject jObj = new JSONObject(response);
if(jObj!=null)
{                         

try 
{

     String downloadDetails = jObj.getString("downloadDetails");

     String jsonFormattedString = downloadDetails.replaceAll("\\", "");

     JSONArray jsonArray = new JSONArray(jsonFormattedString);

     for (int i = 0; i < jsonArray.length(); i++) {

         System.out.println("adding in list==>"+ jsonArray.getString(i));

         String innerArray = jsonArray.getString(i);


         innerArray = innerArray.replace("[","");
         innerArray = innerArray.replace("]","");

         String[] innerValue = innerArray.split(",");

         for (int j = 0; j < innerValue.length; j++){

           Log.i("OUTPUT",":"+innerValue[j]);

         }
     }

}
catch (JSONException e) 
{
      // TODO Auto-generated catch block
      e.printStackTrace();
}

内部输出

I/adding in list==>: [9164666666, 20171001, MADAN LAL CHOURISYA, 16, 1342.6]
I/OUTPUT: :9164666666
I/OUTPUT: : 20171001
I/OUTPUT: : MADAN LAL CHOURISYA
I/OUTPUT: : 16
I/OUTPUT: : 1342.6

Answer 4

我想在@Niket Shah 的回答中添加我的评论

try {

            JSONObject jObj = new JSONObject(text);
            String arrayString = jObj.getString("downloadDetails");

            JSONArray jObjTemp = new JSONArray(arrayString);

            List<String> list = new ArrayList<String>();
            for (int j = 0; j < jObjTemp.length(); j++) {
                System.out.println("adding in list==>" + jObjTemp.getString(j));

                list.add(jObjTemp.getString(j));
            }
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

当我得到日志时它显示：

I/System.out: adding in list==>[9164666666, 20171001, MADAN LAL CHOURISYA, 16, 1342.6] I/System.out: adding in list==>[9868476619, 20171001, RAHUL JAIN/CHUNNILAL JAIN, 50, 121] I/System.out: adding in list==>[9173666666, 20171001, SHRI BALKRISHAN / DHARMLAL KUR, 13, 3246]

I/System.out: adding in list==>[9833216286, 20171001, SMT CHANDA JAIN/SHRI CHANDMAL , 50, 4502.23]

I/System.out: adding in list==>[7073016885, 20171001, MAHESH KUMAR / BRAJLAL KUSHWAH, 48, 1560.8]

如有疑问，请随时发表评论。

编码愉快...

如何解析 JSON 以便我可以遍历元素

How to parse a JSON so that I can loop through elements

android

json

jsonparser