如何從JSON數組（不是JSON對象）訪問每個節點？

Question

我需要從具有JSON數組而不是JSON對象的URL下載數據，至少我的理解是這樣。

從URL檢索數據：

// JSONObject jsonObject=new JSONObject(ParsingDta);
JSONArray jsonArray = jsonObject.getJSONArray("Employee");
for (int i = 0; i < jsonArray.length(); i++) {
    // JSONObject jsonObject1=jsonArray.getJSONObject(i);
    String id = jsonObject1.getString("id").toString();
    String name = jsonObject1.getString("name").toString();
    String salary = jsonObject1.getString("salary").toString();
    database.insertData(id, name, salary);
    str += "\n Employee" + i + "\n name:" + name + "\n id:" + id + "\n salary:" + salary + "\n";
    // textView1.setText(str);
}

上面有我猜的JSON對象，我需要JSON數組

[{"billedret":0,"class":"com.enteleki.sfa.botree.RetailerSummary","ctgcode":"G00"  ...

等等..

Answer 1

如果您要從數據源接收JSON數組，則需要從接收到的數據創建JSON數組，而不是嘗試將數組變成對象。

嘗試創建一個新的JSON數組，如下所示。

JSONArray jsonArray = new JSONArray(ParsingData);

現在，應該根據收到的數據創建JSON數組，然后可以像使用普通JSON數組一樣使用它。

Answer 2

這就是我用來從網址獲取數據的方法

public void printRes(String res) throws JSONException { 
    try {
        //the asyncTask returns string to this function

        JSONArray arr = new JSONArray(res);
        int t = arr.length();
        nameArray = new String[t];
        distArray = new String[t];
        latArray = new String[t];
        lonArray = new String[t];
        pgr.setProgress(70);
        list = new ArrayList<String>();
        for (int i = 0; i < arr.length(); i++) {
            pgr.setProgress(50);
            nameArray[i] = (arr.getJSONObject(i).getString("name"));
            distArray[i] = (arr.getJSONObject(i).getString("distance"));
            latArray[i] = (arr.getJSONObject(i).getString("latitude"));
            lonArray[i] = (arr.getJSONObject(i).getString("longitude"));


        }

編輯

我使用asyncTask從網址下載數據

        String latt = LatVal.getText().toString();
        String lonn = LongVal.getText().toString();

        // Create data variable for sending values to server

        data = URLEncoder.encode("lat", "UTF-8") + "="
                + URLEncoder.encode(latt, "UTF-8");

        data += "&" + URLEncoder.encode("longi", "UTF-8") + "="
                + URLEncoder.encode(lonn, "UTF-8");

        data += "&" + URLEncoder.encode("radius", "UTF-8") + "="
                + URLEncoder.encode(Dis, "UTF-8");

        text = "";


        // Send data

        new AsyncCaller().execute(data);

該字符串作為POST在線程AsyncCaller中發送

class AsyncCaller extends AsyncTask<String,String,String>
{

 MainActivity obj=new MainActivity();
 BufferedReader reader=null;
 @Override
 protected void onPreExecute() {
 super.onPreExecute();

  //this method will be running on UI thread

 }
 @Override
 protected String doInBackground(String...res) {

//this method will be running on background thread so don't update UI      
//  frome here
//do your long running http tasks here,you dont want to pass argument 
//and u can access the parent class' variable url over here
//String ads=Arrays.toString(res);

try {
  //Create connection

    // Defined URL  where to send data
    URL url = new URL("**your URL**");

 // Send POST data request
 String data=res[0];
//String sub="lat=10.0243567&longi=76.3084289&radius=500";
//"lat=ben&longi=ascd&radius=500";
  URLConnection conn = url.openConnection();
  conn.setDoOutput(true); 
  OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
  wr.write(data); 
  wr.flush(); 

  // Get the server response 
  reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
  StringBuilder sb = new StringBuilder();
  String line = null;

  // Read Server Response
  while((line = reader.readLine()) != null)
      {
             // Append server response in string
             sb.append(line + "\n");

      }

 obj.text = sb.toString();

  } catch(Exception ex)
  {
    ex.printStackTrace();
  }
   finally
  {
   try
   {

      reader.close();
   }

   catch(Exception ex) {}
 }

 // Show response on activity

return obj.text;
 }

@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);

try {
obj.printRes(result);//this contains the download data from the URL
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}


}

我使用此代碼在發布一些經度和緯度的同時從url下載數據...

U可以進行所需的更改以下載數據。

祝好運。

Answer 3

有一個用於處理這樣的Json Array的選項

String data="[{"billedret":0,"class":"com.enteleki.sfa.botree.RetailerSummary","ctgcode":"G00"....... your full json text}]";
JSONArray completeArray = new JSONArray(data);

for (int i=0;i<completeArray .length();i++){
     JSONObject finalEntry=(JSONObject) completeArray .get(i);
       // add your logic for read info from finalEntry jsonObjec.

 }

我希望它適合你。