Problem with remote applications interaction using URL
 

Hello everyone, beforehand, sorry for my english...
I have to do client - server application. They must interact, using classes URL, URLConnection. I understand, how to send data to server. But I can not realize server work.
The common algorithm of server is:
1. Start.
2. Wait for connection.
3. After receiving connection it must process request.
4. Or back for "2" or exit.

as I understand, client code to send request is:

            URL url = new URL ("http://" + host + ":" + port);

            URLConnection c = url.openConnection();

            c.setDoOutput(true);

            c.connect();

            

            OutputStreamWriter out = new OutputStreamWriter(c.getOutputStream());

            out.write(URLEncoder.encode(request,"UTF-8") );

            out.flush();

            out.close();

please help with server code to catch this connection?

Re: Problem with remote applications interaction using URL
 

Please, at least somebody!
Any help at all would be greatly appreciated!

Re: Problem with remote applications interaction using URL
 

here ya go, just needs slight modification on response and your listening ports

http://www.codeproject.com/KB/IP/tcpclientserver.aspx

Re: Problem with remote applications interaction using URL
 

sorry, forgot it was java, here's a sample java tcplistener

http://www.koders.com/java/fid857615...7AE75C4F5.aspx

Re: Problem with remote applications interaction using URL
 

Yeah ... THANKS... IT WORKS (almost). So I have another problem:
server catches the client connections, but when I'm trying to read from InputStream

        BufferedReader is = new BufferedReader(new InputStreamReader(socket.getInputStream()));



        //....

        

        String line;

        while ((line = is.readLine()) != null)       

        {

            

                request += "\n" + line;

        }

it reads information:
"
POST / HTTP/1.1
Connection: close
Keep-Alive: 300
User-Agent: Java/1.6.0_07
Host: localhost:2604
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Content-type: application/x-www-form-urlencoded
Content-Length: 38

key1=search%09StudentRecBook%09123"
and after that stops at

        while ((line = is.readLine()) != null)

like waiting for reading something else from stream.
What he is waiting for? Help :)

Re: Problem with remote applications interaction using URL
 

i don't think it will return null, until the socket gets closed

not for sure if this is the terminator, but did you check for "." (period) with crlf?

also check -1

Re: Problem with remote applications interaction using URL
 

I already tried -1 - same. And I took "null" from java help
Can you tell what you mean as period?

Re: Problem with remote applications interaction using URL
 

nm, think i was thinking of something else

can you please post the server and client code, at least the guts part where its sending and receiving

Re: Problem with remote applications interaction using URL
 

Server:

private Socket socket = null;

private BufferedReader is = null;

private PrintWriter os = null;

private String request = "";

private ServerSocket ss = null;

private int port = 2604;



public void run()

    {

        try

        {



            String line;

            while ((line = is.readLine()) != null) {

                request += "\n" + line;

            }

                        

            System.out.println("Request from ctient: " + request);

            System.out.println("Processing...");

            String msgToReport = AnalyzeEntryRequest(request);

            System.out.println("Sending: " + msgToReport);

            os.println(msgToReport);

            os.flush();

        }

        catch (IOException e)

        {

            System.out.println("Ошибка ввода-вывода. " + e);

        }

        finally

        {

            try

            {

                is.close();

                os.close();

                socket.close();

                System.out.println("Клиент " + socket + " отсоединен.");

            }

            catch (IOException e)

            {

                System.out.println("Ошибка закрытия сокетов. " + e);

            }

        }

    }

private boolean InitServer()

    {

        boolean res = true;

        

        try

        {

            is = new BufferedReader(new InputStreamReader(socket.getInputStream()));

            os = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())));

        }

        catch (IOException e)

        {

            System.out.println("Ошибка создания потоков. " + e);

        }

        new  Thread (this).start();

        System.out.println("Запуск сервера.");



        return res;

    }

Client:

    private String sendRequest(String request)

    {

        String result = "";

        this.host = jTextField7.getText();

        InputStream in = null;

        OutputStreamWriter out = null;

        try

        {

            URL url = new URL ("http://" + host + ":" + port);

            URLConnection c = url.openConnection();

            c.setDoOutput(true);

            c.connect();

            

            out = new OutputStreamWriter(c.getOutputStream());



            String data =  URLEncoder.encode("key1", "UTF-8") + "=" + URLEncoder.encode(request, "UTF-8") + "\r\n\r\n";

            

            out.write(data);            

            out.flush();



            out.close();

            

            BufferedReader rd = new BufferedReader(new InputStreamReader(c.getInputStream()));

            String line;

            while ((line = rd.readLine()) != null) 

            {

            

                result += "\n" + line;

            }



            in.close();

        }

        catch (Exception e)

        {

            JOptionPane.showMessageDialog(jTextPane1,"Ошибка передачи данных. " + e);

        }

        

        return result;

    }

There was no case in which server send response and client recieves it. So It can be mistakes there...

Re: Problem with remote applications interaction using URL
 

oops.. sorry for russian messages. It is only messages like "Server started" or "IO error". If it necessary I can translate it... :)