Vector problem

Question

Hi to you all,
I have built a table which retrieves data from a .jsp file by making an http request. The particular request is made every 10 seconds.
The data is read in lines and the lines are stored in a vector.
i.e. the line is: 1 34 er ty 23
where id=1
The table is built by getting the vector elements (lines). The first element of each line is the "id"(int). On the second request data might have been changed in one or more lines in the .jsp file, thus the program must identify the change(s) and update only the specific line(s) according to the "id". I tried to do something but unfortunately the program reads only the first line of the .jsp file. Can u give me any hlep. Apologies if the explanation of my problem is poor.
I am including the specific part of my code.
Thanx
public void readDataLine()
          URL url;
          URLConnection connection;
          String inputLine;     
          DataInputStream inStream;
          int position = -1;
          int id=0;
          int i=0;
          String cToken;
          try
          url = new URL("http","127.0.0.1",80,"/clock.jsp");
          connection = url.openConnection();
          inStream = new DataInputStream (connection.getInputStream());
          //BufferedReader br = new BufferedReader(inStream);
          while (null != inStream.readLine())
               String st = inStream.readLine();
               System.out.println("st: " + st);
                    StringTokenizer tokenizer = new StringTokenizer(st, ";");
                    //System.out.println("The String has " + tokenizer.countTokens() + " words." );
                    while (tokenizer.hasMoreTokens())
                         cToken = tokenizer.nextToken();
                         data.addElement(cToken);
                         if (i == 0)
                              id = Integer.parseInt(cToken);
                         i++;
                    // Add the vector with the 16 elements to the vector of vectors.
                    // vLocalStore.addElement(data.clone());
                    //hold vector into memory
                    // perform the change
                    position = -1;
                    for (i=0; i<vLocalStore.size(); i++)
                         Vector v = (Vector) vLocalStore.elementAt(i);
                         if (id == ((Integer) v.firstElement()).intValue())
                              position = i;
                              break;
                    if (position == -1)
                         // this is a new element in the vector
                         vLocalStore.addElement(data.clone());
                         System.out.println("v: " + vLocalStore);
                    else
                         // this is a replacement instruction
                         vLocalStore.removeElementAt(position);
                         vLocalStore.insertElementAt(data.clone(),position);
                         //System.out.println("id: " + ((Integer) v.firstElement()).intValue());
                         System.out.println("v: " + vLocalStore);
                    // Clear all the 16 elements.
                    data.clear();
          inStream.close();
          }           // end try
          catch (IOException e)
          System.err.println("I/O Exception: " + e);
          catch (NoSuchElementException e)
          System.err.println("No such element: " + e.getMessage());
          catch (ArrayIndexOutOfBoundsException e)
               System.err.println("Exception: " + e.getMessage());
          catch (Exception e)
               System.err.println("Exception: " + e.getMessage());
     }          // end readDataLine

Answer 1

Actually, I doubt it reads the first line. You've written while (null != inStream.readLine())
    String st = inStream.readLine();This reads the first line, discards it, and then reads another line. What you should replace it with is String st;
while ((st = inStream.readLine()) != null)
{or, if you want to keep your scope minimal,for (String st; (st = inStream.readLine()) != null; /* do nothing*/)
{There may be other errors, but it's hard to read unformatted code. If this doesn't fix the problem, please repost the code using &#91;code] tags.