org.json.JSONException在android中不能转换为JSONArray

Question

当我尝试用IP地址连接web服务器时，我得到了这个JSON错误。

org.json.JSONException: Value {"dsdata":{"ttlogin":[{"BundyId":"9090","Name":"IT DEVELOPMENT"}]}} of type org.json.JSONObject cannot be converted to JSONArray
W/System.err:     at org.json.JSON.typeMismatch(JSON.java:112)

My java code

@Override
protected String doInBackground(String... params) {

String login_url ="http://200.200.200.20/bin/dev/dispatch/truckunloading.p";
try {
URL url = new URL(login_url);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setConnectTimeout(10000);
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream OS = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(OS, "UTF-8"));
String data = URLEncoder.encode("ctype", "UTF-8") + "=" + URLEncoder.encode("login", "UTF-8") + "&"
+ URLEncoder.encode("clogin", "UTF-8") + "=" + URLEncoder.encode("9090", "UTF-8");
bufferedWriter.write(data);
bufferedWriter.flush();
bufferedWriter.close();
OS.close();
Log.e("ERROR OBJECT", "Conneting");
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(inputStream, "iso-8859-1"));
String response = "";
String line = "";
while ((line = bufferedReader.readLine()) != null) {
response += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
try {
JSONArray jsonarray = new JSONArray(response);
for (int i = 0; i < jsonarray.length(); i++) {
JSONObject jsonobject = jsonarray.getJSONObject(i);
Log.e("ERROR OBJECT", jsonobject.toString());
}
} catch (JSONException e) {
e.printStackTrace();
return response;
}
return "good";
} catch (MalformedURLException e) {
e.printStackTrace();
return "fail";
} catch (IOException ee) {
ee.printStackTrace();
return "fail";
}
}

我到处找都找不出来。

它在浏览器中给了我理想的响应，但我不知道android有什么问题!

请帮帮我。

Answer 1

JSONArray字符串包含在[]中，JSONObject字符串包含在{}中。字符串你试图解析不是JSONArray——JSONObject,而不是

JSONArray jsonarray = new JSONArray(response);

你需要使用

JSONObject jsonObj = new JSONObject(response);

这就是为什么错误信息显示为type org.json.JSONObject cannot be converted to JSONArray。

一旦有了对象，就可以得到嵌套在in中的对象或数组。在本例中，JSON字符串看起来像这样:

{"dsdata":{"ttlogin":[{"BundyId":"9090","Name":"IT DEVELOPMENT"}]}}

所以如果你想获得"ttlogin"数组，可以使用

JSONObject jsonObj = new JSONObject(response);
JSONArray arr = jsonObj.getJSONObject("dsdata").getJSONArray("ttlogin");