Hi,
Im trying to post a jpg from java to a php. My question is what would be the best type of stream to do this and also how do I convert my jpg (currently a BufferedImage type) to a format that can be writen to this stream?
Thanks for any pointers, Im struggling to do any more than post a string.
Tomm
Really the appropriate transaction type is "PUT" rather than "POST". Cast the connection to HttpURLConnection to change the method type. A Content-length header is required (unfortunately, since it means buffering the stream you are to send).
As to format, you could use ImageIO to convert to one of the standard forms (jpeg, png etc.) or you can write binary and sort the format out for yourself.
If you use ImageIO you'll have to use a ByteArrayOutputStream to buffer the data, if only to get the length for the content-length header.
ok - thanks very much for your help. Ive kinda got my brain in a twist over the order that buffered streams need to be chained together...
does the stream need to be initialised with the buffer or vice-versa? Im thinking along these lines:
BufferedImage image = ImageIO.read(new File("IMAGE TO PUT"));
JPGimage = convert_to_jpg(image);//assuming ive written this :P
String address ="WHERE THE PHP SCRIPT IS";
//open connection to address
URL dataURL = new URL(address);
URLConnection connection = dataURL.openConnection();
//set request to a POST of multipart data (eg image)
((HttpURLConnection)connection).setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "multipart/form-data");
// no caching
connection.setUseCaches(false);
// allow output
connection.setDoOutput(true);
// instatiate buffered stream
ByteArrayOutputStream bytearrayoutputstream = new ByteArrayOutputStream();
// put picture in buffer
bytearrayoutputstream.write(image);
// set content-length to size of whats in buffer
String length_of_data = String.valueOf(bytearrayoutputstream.size());
connection.setRequestProperty ("Content-Length", length_of_data);
//close stream to buffer
bytearrayoutputstream.close();
//open stream to address via connection
OutputStream outputstream = connection.getOutputStream();
// write content of buffer to outputstream
outputstream.write(bytearrayoutputstream.toByteArray());
outputstream.flush();
outputstream.close();
ive found lost of examples of buffered streams but they all seam to chain things differently so its hard to get a grasp on what the common elements are.
Thanks again
Tomm
java.awt.image.BufferedImage bufimg = null;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
javax.imageio.ImageIO.write(bufimg, "jpg", baos);
java.net.URL url = new java.net.URL("http://hostname/xxx.php");
java.net.HttpURLConnection urlConn = (java.net.HttpURLConnection)url.openConnection();
urlConn.setRequestProperty("Content-Type","application/octet-stream");
urlConn.setRequestProperty("Content-length", "" + baos.size());
urlConn.setRequestProperty("pure-data", "yes");
urlConn.setRequestProperty("Connection","Keep-Alive");
urlConn.setDoOutput(true);
OutputStream out = urlConn.getOutputStream();
Just some ideas.
