Pass parameter from JApplet to php file using POST method

[maja neskovic]

I have connected my JApplet with one php file, which gets the parameter from my applet and write it to MySQL database. Parameter is passed using textfield - user enters string and confirms it's choice clicking on Submit button.

I have made this connection using GET method, but I have to use POST method for sending parameter. I hope somebody can help me to do that.

Here is how I made connection:

In init() method I wrote:

                  submitlink = getParameter("link") + "?pk=" + "&upisodg=";
  

link is a parameter which I defined in HTML file. It's value is http://localhost/subtest.php.

In my ActionPerformed method for button clicked I wrote:

             try
        {
        fileToRead = submitlink + unos.getText().toString();
        String prHtml = getParameter("fileToRead");
        if (prHtml != null) fileToRead = new String(prHtml);
        readFile();
        }
       catch (Exception ex){
       ex.printStackTrace();
       }   

Submitlink and fileToRead are strings.

Here is my readFile() method:

   public void readFile(){
    String line;
    URL url1 = null;
    try{
      url1 = new URL(getCodeBase(), fileToRead);
    }
    catch(MalformedURLException e){}
    try{
      InputStream in = url1.openStream();
      BufferedReader bf = new BufferedReader(new InputStreamReader(in));
      strBuff = new StringBuffer();
      while((line = bf.readLine()) != null){
        strBuff.append(line + "\n");
      }
    }
    catch(IOException e){
      e.printStackTrace();
    }
  }  

My subtest.php file looks like this:

 <?php

if(isset($_GET['upisodg']))
{

mysql_connect("localhost","root","");
mysql_select_db("mynewdatabase");
mysql_query("INSERT INTO testtab (upisodg) VALUES ('".$_GET['upisodg']."')");

}
?>   

Any help to use POST method instead of GET would be appreciated.

[Lester Burnham]

For the applet side, see http://www.exampledepot.com/egs/java.net/Post.html for an example.

[maja neskovic]

I wrote in my ActionPerformed method (for button clicked):

   try {
    // Construct data
    String data = "http://localhost/subtest.php?upisodg=" + unos.getText().toString();

    // Send data
    URL url = new URL("http://localhost/subtest.php");
    URLConnection conn = url.openConnection();
    conn.setDoOutput(true);
    OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
    wr.write(data);
    wr.flush();
    wr.close();
} catch (Exception ex) {
} 

but I still don't have insert to the database. Where did I made a mistake?

[Lester Burnham]

Having an empty catch block is rarely a good idea, and definitely a bad one when dealing with I/O.

Does the request ever make it to your server code?

[maja neskovic]

No, as far I know. There is no insert to the database (which is done by php file).

[Lester Burnham]

No, as far I know.

Make sure one way or another (maybe by adding logging statements to your server code).

And be sure to add logging to your applet's exception handlers as well.

[maja neskovic]

By server code: do you mean on php file? I am not familiar with PHP, so I am not sure I know to write logging statements there. Can you help me with that?