无法从jsp服务器读取数据

Question

我制作了可以从jsp服务器读取特定数据库的android应用程序。 例如，服务器上有各种数据库表，如时间，温度，湿度等。我喜欢在申请时显示时间和温度。我尝试了很多，Server显示正确的值，但它总是显示“无法读取临时值”。 这是我的代码。

UserFunctions.java

public class UserFunctions {

private static String readURL = "http://myip:8080/read.do";
public String read_email;
ArrayList   tempList    = new ArrayList( ); 
tempVO      vo      = null;

public boolean read_flag = false;

public boolean list_read_flag = false;
public boolean list_date_flag = false;

public class HttpFunctions {


     public ArrayList readTemp(String email)
     {
          r_flag = false;

          read_email = email;

          new ReadHttpTask().execute();
          while(!read_flag);
          return tempList;

}

class ReadHttpTask extends AsyncTask<Void, Void, String>
{
    @Override
    protected String doInBackground(Void... voids) {
        // TODO Auto-generated method stub
        try{
            HttpPost request = new HttpPost(readURL);

            Vector<NameValuePair> nameValue = new Vector<NameValuePair>();
            nameValue.add(new BasicNameValuePair("email", input_email));

            HttpEntity enty = new UrlEncodedFormEntity(nameValue, HTTP.UTF_8);
            request.setEntity(enty);

            HttpClient client = new DefaultHttpClient();
            HttpResponse res = client.execute(request);
            //get a value from server
            HttpEntity entityResponse = res.getEntity();


            BufferedReader reader = new BufferedReader(new InputStreamReader(res.getEntity().getContent(),"utf-8"));
            StringBuilder builder = new StringBuilder();
            String str;


            while ((str = reader.readLine()) != null){ 
                if( str!=null && str.length() > 6 )
                {
                    if (str.substring(0, 2).equals("data")) {
                        vo = new tempVO();
                    }   

                    if (str.substring(0, 5).equals("read:")) {

                        vo.setDATA      ( str.substring(6, str.length()) );
                        list_read_flag = true;
                    }

                    if (str.substring(0, 5).equals("date:")) {

                        vo.setDATA_DATE ( str.substring(6, str.length()) );

                        list_date_flag = true;
                    }
                    if(list_read_flag && list_date_flag)
                    {
                        dataList.add(vo);

                        list_date_flag = false;
                        list_read_flag = false;

                    }
                }
            }

            read_flag = true;

        }catch(UnsupportedEncodingException e){
            e.printStackTrace();
        }catch(IOException e){
            e.printStackTrace();
        }
        return null;
    }
}

MainActivity.java

public class MainActivity extends Activity {


   TextView     txtView;
   ArrayList    tempList    = new ArrayList( ); 

   @Override
   protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.temp);

    txtView = (TextView)findViewById(R.id.readtempdate);
    txtView = (TextView)findViewById(R.id.readtemp);



    Bundle intentRead = getIntent().getExtras();
    String read_email = intentRead.getString("email");

    UserFunctions userFunction = new UserFunctions();

    tempList = userFunction.readtemp(read_email);

    if(tempList.isEmpty())
        {
               Toast.makeText(MainActivity.this, "Fail to read temp values", Toast.LENGTH_LONG).show();
        }

    if( tempList!=null && tempList.size() > 0 ) 
    {
        for( int i = 0; i < tempList.size(); i++ ) 
        {
            tempVO tempvo = (tempVO)tempList.get(i);
            txtView.append(tempvo.gettempDATA());
            txtView.append(tempvo.gettempDATA_DATE());
        }
    }

}