Server socket programming

Question

Hello
I have my MultiThreaded java server running.
It works fine if it gets continuously client request But
client request comes after some period of time,
my server does not respond back.
My server is running through DOS window, so if I click
enter there, then it gives response.I dont know what is the problem.
Here is my server code.
package com.venable.superpages;
import java.io.*;
import java.net.*;
import java.lang.*;
public class MapServer {
public static long totalSystemTime = 0;
public static void main(String args[]) {
          boolean DEBUG = true;;
          int port = 5003;
          int count = 0;
          ServerSocket welcomeSocket = null;
          try {
               welcomeSocket = new ServerSocket(port);
               if (DEBUG)
                    System.out.println("MapServer : main :" +
                    "Main thread about to start ");     
          } catch (IOException e) {
               System.err.println("MapServer: main : Could not open socket");
          while (true) {
               try {
                    Socket socket = welcomeSocket.accept();
                    socket.setKeepAlive(true);
                    socket.setSoTimeout(480000);
                    long startTime = System.currentTimeMillis();
                    System.out.println("Mapserver thread start time " +startTime);
                    MapServerThread serverThread = new MapServerThread(socket,startTime);
                    if (DEBUG)
                         System.err.println("Mapserver : main : thread about to start ");
                    count++;
                    if (DEBUG)
                         System.err.println("MapServer : main :count " + count);
                    serverThread.start();
               } catch (IOException e) {
                    System.err.println("IO Error");
this the thread :-
          public MapServerThread(Socket socket, long time) {
               this.clientSocket = socket;     
               requestStartTime = time;
          public void run() {
               System.out.println( "connecting to server");
               try {
                    inStream = new DataInputStream(clientSocket.getInputStream());
                    outStream = new DataOutputStream (clientSocket.getOutputStream());
                    byte[] len = new byte[6];
                    while(true){
                              inStream.readFully(len);
                              length = Integer.parseInt(new String(len));     
                              if(length == 0){
                                   System.out.println(" breaking the while loop becuase of socket time out");
                                   break;
                              length = length +0; // to remove leading zeroes.
                              System.out.println( "length="+length);
                              byte[] data = new byte[length];
                              inStream.readFully(data);
                              inputParam = new String(data);
                         if(length == 3){    // means left or right on the map special
                              System.out.println( "LENGTH IS 3");
                              getMapStatus(inputParam);
                              if(type.equals("01") ){
                                   getMap();
                              } else{
                                   getDirectionMap();
                         }else{
                              parseInputParameter(inputParam);
                              getLocationPoints(toFrom);
               }catch(EOFException ex){
                    System.out.println( "Here EOF Exception");
                    try{
                         outStream.close();
                         inStream.close();
                         clientSocket.close();
                    }catch( Exception e){
               }catch(Exception e){
                    System.out.println( "Here general Exception");
                    try{
                         outStream.writeBytes(servererror);
                         outStream.close();
                         inStream.close();
                         clientSocket.close();
                    }catch(Exception ex){
               }

Answer 1

What you need to do is just call read(). This will block and only return when there's some data on the socket. At that point, call socket.(getInputStream()).available() to find out how much data there is, and create new byte[] (or char[]) and read the available bytes