Socket Channel Connection - Continuous read

Question

Hi all,
I am new to socket programming. This is where I am stuck...I need to read from a channel 'continuously', i.e messages are continuous published and I need to keep on reading it. Below is my code for review....I am just getting the 1st line of the message. please suggest..Thanks in advance
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.util.Iterator;
import java.util.Set;
public class TestConnection {
     private static Charset charset = Charset.forName("ISO-8859-1");
     private static CharsetDecoder decoder = charset.newDecoder();
     public static void main(String[] args) throws IOException {
          SocketChannel sc = null;
          String desthost = "172.19.67.33";
          int port = 5002;
          InetSocketAddress isa = new InetSocketAddress(InetAddress.getByName(desthost), port);
          try {
               sc = SocketChannel.open();
               sc.connect(isa);
               System.out.println(" Message--> " + readFromChannel(sc, 4096));
          } catch (Exception e) {
               e.printStackTrace();
          } finally {
               if (sc != null)
                    sc.close();
     public static String readFromChannel(SocketChannel sChannel, final int size) throws IOException {
          int numBytes = 0;
          boolean hasRead = false;
          ByteBuffer inBuffer = ByteBuffer.allocateDirect(size);
          CharBuffer charBuffer = CharBuffer.allocate(size + 100);
          StringBuffer dataRead = new StringBuffer();
          Selector selector = Selector.open();
          System.out.println(" Is Connected--> " + sChannel.isConnected());
          System.out.println(" sChannel.isBlocking()--> " + sChannel.isBlocking());
          sChannel.configureBlocking(false);
          System.out.println(" sChannel.isBlocking()--> " + sChannel.isBlocking());
          sChannel.register(selector, SelectionKey.OP_READ);
          try {
               while (selector.select(20000) > 0) {
                    Set readyKeys = selector.selectedKeys();
                    Iterator readyItor = readyKeys.iterator();
                    while (readyItor.hasNext()) {
                         SelectionKey key = (SelectionKey) readyItor.next();
                         readyItor.remove();
                         ReadableByteChannel keyChannel = (SocketChannel) key.channel();
                         if (key.isReadable()) {
                              for (int i = 0;; i++) {
                                   int count = 0;
                                   if ((count = keyChannel.read(inBuffer)) < 0) // EOF
                                        keyChannel.close();
                                        throw new IOException("Socket lost connection during read operation");
                                   numBytes += count;
                                   if (!inBuffer.hasRemaining()) {
                                        hasRead = true;
                                        System.out.println("has read");
                                        System.out.println("SUCCESSFUL, length of data read:" + numBytes);
                                        inBuffer.flip();
                                        decoder.decode(inBuffer, charBuffer, false);
                                        charBuffer.flip();
                                        selector.close();
                                        return dataRead.append(charBuffer).toString();
                                   if (i >= 2) {
                                        break;
               if (false == hasRead) {
                    System.err.println("has _NOT_ read");
                    System.err.println("length of data read: " + numBytes);
                    System.err.println("length of data read: " + numBytes);
                    if (numBytes > 0) {
                         inBuffer.flip();
                         decoder.decode(inBuffer, charBuffer, false);
                         charBuffer.flip();
                         System.err.println("ERROR, data read: " + dataRead.append(charBuffer).toString());
                    throw new IOException("Socket read operation timed out");
               } else {
                    throw new IOException("Invalid Read Socket state");
          } finally {
               selector.close();
}

Answer 1

The output is -->
Is Connected--> true
sChannel.isBlocking()--> true
sChannel.isBlocking()--> false
has read
SUCCESSFUL, length of data read:4096
Message--> 000c100000300000007f100700302E12008071104060400 Lane Communication Is OK 004d100500300302E0100000027000000000000000000000000000010845800000000000000000000000c100000302E01007f100700303E12008071104140200 Lane Communication Is OK 004d100500300303E0402350427000000000000000000000000000119107300000008500000000000000c100000303E00007f100700304E12008070704085600 Lane Communication Is OK 004d100500300304E0201521427000000000000000000000000000081090700000003640000000000000c100000304E00007f100700305X12008071104111600 Lane Communication Is OK 004d100500300305X0801411215000000000000000000000000000048892600000000810000000001000c100000305X00007f100700306X12008071104102600 Lane Communication Is OK 004d100500300306X0800660815000000000000000000000000000046838800000000760000000000000c100000306X00007f100700307X12008063003542200 Lane Communication Is OK 004d100500300307X1000445315000000000000000000000000000125509000000017220000000127000c100000307X000104100300300307X200807111727309311015004453030200000000000000000000000000000527000001020102000000001154210344501304E2008071116072500EZPASS TAG# 022 - 04522780 STATUS = VALID TYPE = INTERIOR FPT Program Status = Success 00012550910000001723000000012820104100300300305X200807111727325610815014112010200000000000000000000000000000000010201020102000000005146360015500121E2008071117010800MANUAL CASH IN EXIT MANUAL 00004889270000000082000000000100104100300300307X200807111727353911015004453030200000000000000000000000000000072000001020102000000001154220344700103E2008071117070600EZPASS TAG# 008 - 03623801 STATUS = VALID TYPE = INTERIOR FPT Program Status = Success 00012550920000001724000000012800104100300300307X200807111727379411015004453030200000000000000000000000000000072000001020102000000001154230344900401E2008071117181300EZPASS TAG# 006 - 00468916 STATUS = VALID TYPE = INTERIOR FPT Program Status = Success 00012550930000001725000000012800104100300300306X200807111727399610815006608010200000000000000000000000000000000010201020102000000000075910013300613E2008071117032500MANUAL
The out actually gives multiple line...but what should be the approach to read line by line continuously and keep parsing them......
kind regards