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POmultipart file-upload post request from java
 

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    <p>I'm trying to make a program that uploads a image to a webserver that accepts multipart file-uploads. </p> <p>More specificly i want to make a http POST request to <a href="http://iqs.me" rel="nofollow noreferrer">http://iqs.me</a> that sends a file in the variable "pic".</p> <p>I've made a lot of tries but i don't know if i've even been close. The hardest part seems to be to get a HttpURLConnection to make a request of the type POST. The response i get looks like it makes a GET.</p> <p>(And i want to do this without any third party libs)</p> <p>UPDATE: non-working code goes here (no errors but doesn't seem to do a POST):</p> <pre><code> HttpURLConnection conn = null; BufferedReader br = null; DataOutputStream dos = null; DataInputStream inStream = null; InputStream is = null; OutputStream os = null; boolean ret = false; String StrMessage = ""; String exsistingFileName = "myScreenShot.png"; String lineEnd = "\r\n"; String twoHyphens = "--"; String boundary = "*****"; int bytesRead, bytesAvailable, bufferSize; byte[] buffer; int maxBufferSize = 1*1024*1024; String responseFromServer = ""; String urlString = "http://iqs.local.com/index.php"; try{ FileInputStream fileInputStream = new FileInputStream( new File(exsistingFileName) ); URL url = new URL(urlString); conn = (HttpURLConnection) url.openConnection(); conn.setDoInput(true); conn.setDoOutput(true); conn.setRequestMethod("POST"); conn.setUseCaches(false); conn.setRequestProperty("Connection", "Keep-Alive"); conn.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary); dos = new DataOutputStream( conn.getOutputStream() ); dos.writeBytes(twoHyphens + boundary + lineEnd); dos.writeBytes("Content-Disposition: form-data; name=\"pic\";" + " filename=\"" + exsistingFileName +"\"" + lineEnd); dos.writeBytes(lineEnd); bytesAvailable = fileInputStream.available(); bufferSize = Math.min(bytesAvailable, maxBufferSize); buffer = new byte[bufferSize]; bytesRead = fileInputStream.read(buffer, 0, bufferSize); while (bytesRead &gt; 0){ dos.write(buffer, 0, bufferSize); bytesAvailable = fileInputStream.available(); bufferSize = Math.min(bytesAvailable, maxBufferSize); bytesRead = fileInputStream.read(buffer, 0, bufferSize); } dos.writeBytes(lineEnd); dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd); fileInputStream.close(); dos.flush(); dos.close(); }catch (MalformedURLException ex){ System.out.println("Error:"+ex); }catch (IOException ioe){ System.out.println("Error:"+ioe); } try{ inStream = new DataInputStream ( conn.getInputStream() ); String str; while (( str = inStream.readLine()) != null){ System.out.println(str); } inStream.close(); }catch (IOException ioex){ System.out.println("Error: "+ioex); } </code></pre>
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    1. COPlease post your code, otherwise we can hardly help you...
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      1. USPéter Török
    2. COOkay code added :)
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      1. USMartin
    3. COI don't have the time to go through all of this right now, but I've posted answers with working code samples before, you may find it useful as well: [here](http://stackoverflow.com/questions/2469451/upload-files-with-java/2469587#2469587) and a follow-up [here](http://stackoverflow.com/questions/2477449/simple-stream-read-write-question-in-java/2478127#2478127). To keep all the verbosity down and ease all the work, I strongly recommend to go ahead with [Apache HttpComponents HttpClient](http://hc.apache.org/httpcomponents-client/index.html).
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