Facing some problems in my client server application ? It is showing connection reset ?

[Parshant Sehrawat]

Here is my ChatServer class

import java.net.*;
import java.util.Scanner;
import java.io.*;

public class ChatServer
{  private Socket          socket   = null;
   private ServerSocket    server   = null;
   private DataInputStream streamIn =  null;
   private DataOutputStream streamOut =  null;
   private FileInputStream read = null;
   private DataInputStream readFile =  null;
   private Scanner in=null;
   public ChatServer(int port)
   {  try
      {  System.out.println("Binding to port " + port + ", please wait  ...");
         server = new ServerSocket(port);  
         System.out.println("Server started: " + server);
         System.out.println("Waiting for a client ..."); 
         socket = server.accept();
         System.out.println("Client accepted: " + socket);
         
         open();
         String msg="";
         boolean done = false;
         int choice=0;
         while (!done)
         {  
        	 choice=streamIn.readInt();
        	 switch(choice){
        	 case 1: //chat server
        		 String line="hi";
        		 while(!((line.equals("bye") || msg.equals("bye")))){
        		 try{
        			 if((line = streamIn.readUTF())!=null)
        				 System.out.print("Client > "+line+"\n");
            		 System.out.println("Server > ");
            		 msg=in.nextLine();
            		 streamOut.writeUTF(msg);
            		 streamOut.flush();
            		 done = (line.equals("bye") || msg.equals("bye"));
            	 }
                catch(IOException ioe){
                	done = true;
                }
        		 }
        		 break;
        	 case 2://file reader
        		 //streamOut.writeUTF("Enter The File Name : ");
        		 String fileName = streamIn.readUTF();
        		 fileOpen(fileName);
        		 String content="";
        		 while((content = readFile.readUTF())!= null){
        			 streamOut.writeUTF(content);
        		 }
        		 streamOut.flush();
        		 break;
        	 case 3: //multiplication method
        		 streamOut.writeUTF("Enter two integers : ");
        		 int op1=streamIn.readInt(),op2=streamIn.readInt();
        		 streamOut.writeInt(op1*op2);
        		 streamOut.flush();
        		 break;
        	 case 4:
        		 done=true;
        		 break;
        	 }
         }
         close();
      }
      catch(IOException ioe){
    	  System.out.println(ioe); 
      }
   }
   
   private void fileOpen(String name) throws IOException{
	   name="C:\\Documents and Settings\\parshant.s\\workspace\\ChatServer\\" + name;
	   try{
	   readFile=new DataInputStream( new FileInputStream("C:\\Documents and Settings\\parshant.s\\workspace\\ChatServer\\demo.txt"));
	   }
	   catch(Exception e){
		   streamOut.writeUTF("File not Found !!! Sorry");
	   }
   }
   
   public void open() throws IOException{
	   streamIn = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
	   streamOut = new DataOutputStream(new BufferedOutputStream(socket.getOutputStream()));
	   in=new Scanner(System.in);
   }
   public void close() throws IOException
   {  if (socket != null)    socket.close();
      if (streamIn != null)  streamIn.close();
   }
   public static void main(String args[])
   {  ChatServer server = null;
      server = new ChatServer(5556);
   }
}

Here is my ChatClient class

import java.net.*;
import java.util.Scanner;
import java.io.*;

public class ChatClient
{  private Socket socket              = null;
   private DataInputStream  streamIn   = null;
   private DataOutputStream streamOut = null;
   private Scanner in = null;

   public ChatClient(String serverName, int serverPort)
   {  System.out.println("Establishing connection. Please wait ...");
      try
      {  socket = new Socket(serverName, serverPort);
         System.out.println("Connected: " + socket);
         
      }
      catch(UnknownHostException uhe)
      {  System.out.println("Host unknown: " + uhe.getMessage());
      }
      catch(IOException ioe)
      {  System.out.println("Unexpected exception: " + ioe.getMessage());
      }
      String line = "hi",msg="hi";
      boolean done=false;
      while (!done)
      {  try
         {  start();
    	  	System.out.println("*************************************************");
    	  	System.out.println("                Server Menu                      ");
    	  	System.out.println("*************************************************");
    	  	System.out.println("             1. Chat to server                   ");
    	  	System.out.println("             2. Read a File                      ");
    	  	System.out.println("             3. Multiply two digits              ");
    	  	System.out.println("             4. Exit                             ");
    	  	System.out.println("*************************************************");
    	  	System.out.print("             Enter your choice : ");
    	  	int choice = in.nextInt();
    	  	try
    	  	{
    	  	streamOut.writeInt(choice);
    	  	}
    	  	catch(Exception e){System.out.println("not able to write");}
    	  	switch(choice){
    	  	case 1:
    	  		while(!(line.equals("bye") || msg.equals("bye"))){
    	  		System.out.println("Client > ");
        	  	line = in.nextLine();
                streamOut.writeUTF(line);
                msg=streamIn.readUTF();
                if(msg.length()>0)
                	System.out.println("Server > "+msg);
                streamOut.flush();
    	  		}
                break;
    	  	case 2:
    	  		
    	  		System.out.println("ghfjgu"+choice);
    	  		System.out.print("Enter a file name : ");
    	  		try{streamOut.writeUTF(in.next());
    	  		}
    	  		catch(Exception e){
    	  			System.out.println("Hell!!!");
    	  		}
    	  		String content="";
    	  		try{
    	  			while((content= streamIn.readUTF())!=null){
    	  				System.out.println(content);
    	  		}
    	  		}
    	  			catch(Exception e){
    	  				System.out.println("Hell 2!!!!");
    	  				}
    	  		streamOut.flush();
    	  		
    	  		
    	  		break;
    	  	case 3:
    	  		System.out.print(streamIn.readUTF());
    	  		streamOut.writeInt(in.nextInt());
    	  		streamOut.writeInt(in.nextInt());
    	  		System.out.println(" Result after multiplication is "+streamIn.readInt());
    	  		streamOut.flush();
    	  		break;
    	  	case 4:
    	  		done=true;
    	  		break;
    	  	}
         }
         catch(IOException ioe)
         {  System.out.println("Sending error: " + ioe.getMessage());
         }
      }
   }
   public void start() throws IOException
   {  streamIn   = new DataInputStream(socket.getInputStream());
      streamOut = new DataOutputStream(socket.getOutputStream());
      in=new Scanner(System.in);
   }
   public void stop()
   {  try
      {  if (in   != null)  in.close();
         if (streamOut != null)  streamOut.close();
         if (socket    != null)  socket.close();
      }
      catch(IOException ioe)
      {  System.out.println("Error closing ...");
      }
   }
   public static void main(String args[])
   {  ChatClient client = null;
      client = new ChatClient("10.10.1.61", 5556);
   }
}

code is throwing many exception while reading a file or multiply things.
Can any one help me regarding this?