Java HttpURLConnection throwing Connection Reset exception

Question

I'm beginning java network programming but I always get Connect Reset exception for the following code:

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

public class Net {

    public static void main() 
    {

        try
        {
            // this not working ...  URL url = new URL("http://localhost/test.php");

            // not even the following trial
            URL url = new URL("http://www.google.com.gh/");
            HttpURLConnection conn = (HttpURLConnection)url.openConnection();


            // Exception is thrown here
            InputStream in = conn.getInputStream();
        }

        catch (Exception ex)
        {
            System.out.println(ex.getMessage());
        }
    }
}

All examples I have tried in my learning process have failed. I don't know what is wrong. Help please.

Is there a proxy defined when you're just browsing on this particular PC? If so you'll ofcourse need to define the proxy in your code as well. See this question — NickDK
– NickDK, Commented Nov 24, 2013 at 10:04
Works good for me (with a little correction). maybe a permissions issue? — MeNa
– MeNa, Commented Nov 24, 2013 at 10:19
Your code works just fine for me. Indeed looks like some local connectivity problem. Do you get the same result using any publicly accessible url? — Jonik
– Jonik, Commented Nov 24, 2013 at 10:53

Simon · Accepted Answer · 2013-11-24 10:28:01Z

1

Have you tries setting some additional info?

  conn.setRequestMethod("POST");
  conn.setRequestProperty("Content-Type", 
       "application/x-www-form-urlencoded");

  conn.setRequestProperty("Content-Length", "" + 
           Integer.toString(urlParameters.getBytes().length));
  conn.setRequestProperty("Content-Language", "en-US");  

  conn.setUseCaches (false);
  conn.setDoInput(true);
  conn.setDoOutput(true);


 DataOutputStream wr = new DataOutputStream (
              connection.getOutputStream ());
  wr.writeBytes (urlParameters);
  wr.flush ();
  wr.close ();


 The urlParameters is a URL encoded string.

 String urlParameters =
    "fName=" + URLEncoder.encode("???", "UTF-8") +
    "&lName=" + URLEncoder.encode("???", "UTF-8")

edited Nov 24, 2013 at 10:28

answered Nov 24, 2013 at 10:08

Simon

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4 Comments

Daniel Oppong Over a year ago

I had setDoInput, setDoOutput, setUseCaches in other examples but did not work. I include the others and see

Daniel Oppong Over a year ago

Still not working even with the request parameters set. Can't know why.

Simon Over a year ago

You need to send a request first, I edited my answer, does this work?

Daniel Oppong Over a year ago

Ok works now. The problem was from my Antivirus. I think it was blocking the connection. I stopped the antivirus software and it works now.

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