我实现了一个Web服务,它返回一个JSON字符串返回如下:错误解析JSONArray从.NET Web服务
{"checkrecord":[{"rollno":"abc2","percentage":40,"attended":12,"missed":34}],"Table1":[]}
在我的Android应用我试图解析字符串转换为JSONArray,但我无法这样做,因为我在logcat中遇到以下异常:
11-16 22:15:57.381: ERROR/log_tag(462): Error parsing data org.json.JSONException: Value <?xml of type java.lang.String cannot be converted to JSONArray
如何解决这个问题?
我的Android代码如下:
public static JSONArray getJSONfromURL(String b)
{
//initialize
InputStream is = null;
String result = "";
JSONArray jArray = null;
//http post
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}catch(Exception e){
Log.e("log_tag", "Error in http connection "+e.toString());
}
//convert response to string
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result=sb.toString();
}catch(Exception e)
{
Log.e("log_tag", "Error converting result "+e.toString());
}
//try parse the string to a JSON array
try{
jArray = new JSONArray(result);
}
catch(JSONException e)
{
Log.e("log_tag", "Error parsing data "+e.toString());
}
return jArray;
}
这是Web服务代码,返回JSON
public class Service1 : System.Web.Services.WebService
{
[WebMethod]
public String getdata(String rollno)
{
String json;
try
{
using (SqlConnection myConnection = new SqlConnection(@"Data Source=\SQLEXPRESS;Initial Catalog=student;User ID=sa;Password=123"))
{
string select = "select * from checkrecord where rollno=\'" + rollno + "\'";
SqlDataAdapter da = new SqlDataAdapter(select, myConnection);
DataSet ds = new DataSet();
da.Fill(ds, "checkrecord");
DataTable dt = new DataTable();
ds.Tables.Add(dt);
json = Newtonsoft.Json.JsonConvert.SerializeObject(ds);
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return null;
}
return json;
}
您返回的字符串中包含的事实 '<?xml的' 告诉我您的Web服务正在返回XML而不是您指定的JSON。确保您提供的网址实际上返回了JSON。 –
它只返回json,我发布了我的web服务代码 –