Connection Broken & Check??

Hi all friends,

I am developing one uploading software Iam using
Tomcat(servlet) and swing for that.My software working
scenario is iam using Tomcat as a centralized server
and my user from any computer using swing interface
through my Tomcat server they can upload file on any
computer on network supplying IP  address  of that
computer in servlet as a parameter with the url of
servlet.Now I want that if there is no connection with
that computer on which server going to upload file as
per user supplied IP address then server should give a
error message to user and if connection broken in
between file uploading then also server should give
error message to user fot that i want to use JOption
message box of swing[JOption.ErrorMessage("null","No
Connection);] in servlet file.Can any one plz guide me
what will be that code for that.Below r my codes of
servlet file:-

import java.io.*;
import java.util.Enumeration;
import javax.servlet.*;
import javax.servlet.http.*;
public class RecvFileServlet extends HttpServlet {
String s,str,str1,filename,path;
public void init() throws ServletException
{ super.init();
baseFile = new File(BASE_DIR);
str="false";str1="false";
}
public void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException,
IOException
{
response.sendError(response.SC_NOT_ACCEPTABLE, "Must
use POST method.");
}
public void doPost(HttpServletRequest
request,HttpServletResponse response) throws
ServletException, IOException
{
PrintStream pos = new
PrintStream(response.getOutputStream());
response.setContentType("text/plain");
filename = request.getParameter("name");
path = request.getParameter("path");
File outfile = new File(filename);
System.out.println("path value = " + ((path ==
null)?("null")  path)));
System.out.println("name value = " + ((filename ==
null)?("null")  filename)));
if (path != null && filename != null)
{
outfile = new File(path, filename);
System.err.println("Final output file: " +
outfile.getAbsolutePath());
}
// create a DataInputStream to read from sender
DataInputStream dis;
dis = new DataInputStream(request.getInputStream());
OutputStream os;
// create file output stream to write the output file
System.err.println("Using output file " + outfile);
os = new BufferedOutputStream(new
FileOutputStream(outfile));
int cc;
byte [] buf = new byte[1024];
long tot = 0;
// read from the input stream and write to the file
try {
for(cc = dis.read(buf, 0, 1024);cc > 0 ; cc =
dis.read(buf, 0, 1024)) {
os.write(buf, 0, cc);
tot += cc;
System.err.print("+" + cc + "(" + tot + ")");
  }
 } catch (IOException ie) {
 try { os.close(); } catch (Exception e2) { }
pos.println("Problem : " + ie.getMessage()); }
// done reading and writing, close the file output
stream
System.err.println("Write" + tot + " bytes.");
os.close();
// Send back a response message to the application
pos.println("File" +" "+ filename+" "+"Upload
Completed !");
}
}

Regards
Bikash

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