Stuck with readline and acknowledgement processing.

[sukbir frwa]

Dear All,
Below is my codes. Currently the codes gets data from gps devices. The problem now if you notice is that I have to send twice the acknowledgement message that is w.write("$PA\n"); w.flush(); once in line 56 and 57 and once more in 85 and 86 then only I will receive all the 5 strings. Currently my method of receving is the one I have commented out that is from 62 to 128. I notice that if I dont know send the second acknowledgement I only receive the single string but it suppose to be 5 strings. So I am trying to revert to readline method at line 58 but unfortunately it always wait for \n rather than null. Any help.

import java.io.*;
import java.net.*;
import java.util.*;
import java.util.Date;
import java.text.*;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.io.IOException;
public class commServer {
    public static void main(String[] args) {
        try {
            final ServerSocket serverSocketConn = new ServerSocket(9000);
            while (true) 
            {
                try 
                {
                    Socket socketConn1 = serverSocketConn.accept();
                    new Thread(new ConnectionHandler(socketConn1)).start(); 
                }
                catch(Exception e)
                {
                    System.out.println("MyError:Socket Accepting has been caught in main loop."+e.toString());
                    e.printStackTrace(System.out);
                }
            }
        } 
        catch (Exception e) 
        {
            System.out.println("MyError:Socket Conn has been caught in main loop."+e.toString());
            e.printStackTrace(System.out);
            //System.exit(0); 
        }
    }
}
class ConnectionHandler implements Runnable {
    private Socket receivedSocketConn1;
    DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
    DateFormat formatter = new SimpleDateFormat("EEE, dd MMM yyyy"); 
    DateFormat inDf=new SimpleDateFormat("ddMMyyHHmmss"); 
    DateFormat outDf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 
    ConnectionHandler(Socket receivedSocketConn1) {
        this.receivedSocketConn1=receivedSocketConn1;
    }
    //@Override
    public void run() { 
        BufferedWriter w = null;
        BufferedReader r = null;
        try {
            PrintStream out = System.out; 
            BufferedWriter fout = null;
            w = new BufferedWriter(new OutputStreamWriter(receivedSocketConn1.getOutputStream()));
            r = new BufferedReader(new InputStreamReader(receivedSocketConn1.getInputStream()));
            int m = 0, count=0;
            String line="";
            String n="";
            w.write("$PA\n");
            w.flush();
            while ((line = r.readLine()) != null) {
                // Print the content on the console
                System.out.println (line);
            } 
            /*while ((m=r.read()) != -1) 
            {
                Date dateIn = new Date();
                n = n + (char) m;
                int i = n.indexOf("GET");
                if(i != -1) { 
                    break;
                }
                if (m==35)
                {
                    String ori = n;
                    String noCheckSum = n.substring(0,(n.length()-4));
                    int addExist = n.indexOf("@");
                    String[] slave = null;
                    if(addExist!=-1)
                    {
                        slave = noCheckSum.split("@");
                        n = slave[0];
                    }
                    else
                    {
                        n = noCheckSum;
                    }
                    String[] result = n.split(",");
                    w.write("$PA\n");
                    w.flush();
                    int count1 = 0;
                    Date date = Calendar.getInstance().getTime(); 
                    String today = formatter.format(date); 
                    String filename= "MyDataFile"+today+".txt"; 
                    boolean append = true; 
                    FileWriter fw = null;
                    try
                    {
                        fw = new FileWriter(filename,append); 
                        fw.write(ori+" "+dateFormat.format(dateIn)+"\n");//appends the string to the file 
                        Date dateOut = new Date();
                        fw.write("$PA"+" "+dateFormat.format(dateOut)+"\n");//appends the string to the file 
                    }
                    catch (IOException ex) 
                    { 
                        //ex.printStackTrace(new PrintWriter(sWriter));
                        System.out.println("MyError:IOException has been caught in in the file operation"+ex.toString());
                        ex.printStackTrace(System.out);
                    } 
                    finally
                    {
                        try 
                        {
                            if ( fw != null ) 
                            {
                                fw.close();
                            }
                            else 
                            {
                                System.out.println("MyError:fw is null in finally close");
                                //logger.log(Level.SEVERE, "MyError:fw is null in finally close", "");
                            }
                        }
                        catch(IOException ex){
                            System.out.println("MyError:IOException has been caught in fw is null in finally close");
                            ex.printStackTrace(System.out);
                        }
                    }
                    n="";
                }
            }*/
        } 
        catch (IOException ex) 
        { 
            System.out.println("MyError:IOException has been caught in in the main first try");
            ex.printStackTrace(System.out);
        } 
        finally
        {
            try 
            {
                if ( w != null ) 
                {
                    w.close();
                }
                else 
                {
                    System.out.println("MyError:w is null in finally close");
                }
            }
            catch(IOException ex){
                System.out.println("MyError:IOException has been caught in w in finally close");
                ex.printStackTrace(System.out);
            }
        }
    }
}

[Rob Spoor]

Could you please indent your code properly next time? It was almost impossible to read it without it. I've added some this time.

[sukbir frwa]

Dear Rob,
Sorry for the formatting and indent. Thank you.

Rob Spoor wrote:Could you please indent your code properly next time? It was almost impossible to read it without it. I've added some this time.