Mixed/multipart Request with a image file and a amr audio file

Question

Hi people
I am struggling with multipart/mixed request as i am new to java and http. I basically have to write a java code to send a request with two attachments, an audio amr file and a image file of a proprietry format. following is my code
public static void GetVideo()
     HttpURLConnection httpConnection = null;
InputStream bis = null;
     InputStream bis1 = null;
OutputStream bos = null;
     File audioFile = new File("voicejunk.amr");     
     File avatarFile = new File("out.frf");
     System.out.println("Entered Get Video");
     String Boundary = new String("asdfgh");
try
URL url = new URL("http://10.4.21.51:5006/");
httpConnection = (HttpURLConnection) url.openConnection();
     httpConnection.setRequestProperty("Cache-control", "no-cache");
httpConnection.setRequestProperty("Pragma", "no-cache");
httpConnection.setRequestProperty("Content-Type", "multipart/mixed;boundary= \"asdfgh\"");
     httpConnection.setRequestProperty("video-type", "3GPP");
     httpConnection.setRequestProperty("video-encoder", "H.263");
httpConnection.setRequestProperty("audio-encoder", "AMR-NB");
     httpConnection.setRequestProperty("video-size", "QCIF");
     httpConnection.setRequestProperty("video-fps", "10.0");
     httpConnection.setRequestProperty("video-anti-aliasing","yes");      
     httpConnection.setRequestProperty("Content-Length", Long.toString(audioFile.length()+avatarFile.length()+(3*Boundary.length())));     
     //byte[] bytes = createMessage();
     //httpConnection.setRequestProperty("Content-Length", String.valueOf(bytes.length));     
//System.out.println("Size of: "+bytes.length);     
     httpConnection.setRequestProperty("Expect", "100-continue");          
     httpConnection.setRequestProperty("Connection", "Keep-Alive");
     //String AvatarType = new String("FRF");     
httpConnection.setRequestMethod("POST");
     httpConnection.setDoOutput(true);     
     bos = new BufferedOutputStream(httpConnection.getOutputStream());
     bos.write(Boundary.getBytes());
     Session session = Session.getDefaultInstance(new Properties());          
     ByteArrayOutputStream baos = new ByteArrayOutputStream();
     Message msg = new MimeMessage(session);
MimeBodyPart mbp1 = new MimeBodyPart();
FileDataSource filedatasource1 = new FileDataSource("seestorme.frf");
DataHandler dh1 = new DataHandler(filedatasource1);
mbp1.setDataHandler(dh1);
mbp1.setHeader("Content-Type", "x-seestorm-avatar/frf");
     MimeMultipart mmp = new MimeMultipart();
mmp.addBodyPart(mbp1);
msg.setContent(mmp);
msg.writeTo(baos);
     bos.write(baos.toByteArray());     
bos.write(Boundary.getBytes());
     ByteArrayOutputStream baos2 = new ByteArrayOutputStream();
     Message msg2 = new MimeMessage(session);     
     MimeBodyPart mbp2 = new MimeBodyPart();
FileDataSource filedatasource2 = new FileDataSource("voice.amr");
DataHandler dh2 = new DataHandler(filedatasource2);
mbp2.setDataHandler(dh2);
mbp2.setHeader("Content-Type", "audio/amr-nb");
     MimeMultipart mmp2 = new MimeMultipart();
mmp2.addBodyPart(mbp2);
     msg2.setContent(mmp2);
msg2.writeTo(baos2);
     bos.write(baos2.toByteArray());     
bos.write(Boundary.getBytes());          
//httpConnection.getOutputStream().write(bytes);
     //httpConnection.getOutputStream().flush();
     System.out.println("Request made");
int result = httpConnection.getResponseCode();
     String Msg1 = new String(httpConnection.getHeaderField(0));
     String Msg2 = new String(httpConnection.getHeaderField(1));
     String Msg3 = new String(httpConnection.getHeaderField(2));
     String Msg4 = new String(httpConnection.getHeaderField(3));     
     String Msg5 = new String(httpConnection.getHeaderField(4));
     System.out.println(Msg1+" " + Msg2+" " + Msg3+" " + Msg4+" " + Msg5+" ");
if (HttpURLConnection.HTTP_OK == result) {
          System.out.println("Received HTTP result = " + result);
saveResponseData2(httpConnection.getInputStream(),"SeeStorm.frf");
} else {
System.out.println("Received HTTP result = " + result);
     catch (MessagingException me) {
me.printStackTrace();
catch (MalformedURLException mue) {
mue.printStackTrace();
} catch (ConnectException ce) {
ce.printStackTrace();
} catch (IOException ioe) {
     ioe.printStackTrace();
} finally {
if (null != bis) {
try {
bis.close();
} catch (IOException ioe) {
ioe.printStackTrace();
if (null != httpConnection) {
httpConnection.disconnect();
i frankly have no idea how to create a multipart mixed request with boundaries. I get a bad http request error with the above code. Can please someone help me.
Thanks
Adil Saleem

Answer 1

Your WriteImage servlet needs to read the image file in from wherever it is (hard drive, database, whatever), then write it back out to the browser. To do that, first use the HTTPServletResponse object to send the appropriate headers, then call the getOutputStream() method to get an output stream to write the data to. This data will be sent to the browser which, if you've set the headers correctly, will display it as an image.
It's been a long time since I did this (we abandoned storing images in databases quite a long time ago), so I can't be more specific than that, but hopefully that'll be enough to get you going. If you run into any problems, reply and I'll see if I can help further.