How to POST an object in an Applet to a JSP server?

Question

I'm trying to realize such a functionality: when the 'Submit' button of a form is clicked, the form fields as well as a 'byte[]' object in an Applet in the page are POSTed to the JSP server. How to implement this?
PS I hope I'm posting in the right forum.

Answer 1

You could do something like this. Probably you want to make it more generic to be able to add an arbitrary number of fields, but I hope you get an idea.
private void postData() {
       URL url = new URL(/* your url here */);
       URLConnection connection = url.openConnection();
       String boundary = "----------" + Long.toHexString(System.currentTimeMillis());
       connection.setRequestProperty("method", "POST");
       connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
       String name1;        // the name of the first field
       String value1;       // the value of the first field
       String name2;        // the name of the second field
       byte[] value2array; // the value of the second field or some object converted to a byte array
       String output =
               "--" + boundary + "\r\n"
               + "Content-Disposition: form-data; name=\"" + name1 + "\"\r\n"
               + "Content-Type: text/plain\r\n"
               + "Content-Transfer-Encoding: quoted-printable\r\n\r\n"
               + value1 + "\r\n"
               + "--" + boundary + "\r\n"
               + "Content-Disposition: form-data; name=\""+ name2 +"\"\r\n"
               + "Content-Type: image/png\r\n"
               + "Content-Transfer-Encoding: base64\r\n\r\n"
               + new String(value2array) + "\r\n"
               + "--" + boundary + "--\r\n";
       connection.setDoOutput(true);
       connection.getOutputStream().write(output.getBytes());
       connection.connect();
}