How to send local .png to .php file on server using java application?

I have a local .png file that I want to send using POST data to a .php script that will save the data to a .png file on the server. How do I do this? Do I have to encode or something? All I have is a File and a way to POST data. Here is how I am sending the .png: public static byte[] imageToByte(File file) throws FileNotFoundException { FileInputStream fis = new FileInputStream(file); ByteArrayOutputStream bos = new ByteArrayOutputStream(); byte[] buf = new byte[1024]; try { for (int readNum; (readNum = fis.read(buf)) != -1;) { bos.write(buf, 0, readNum); } } catch (IOException ex) { } byte[] bytes = bos.toByteArray(); return bytes; } public static void sendPostData(String url, HashMap data) throws Exception { URL siteUrl = new URL(url); HttpURLConnection conn = (HttpURLConnection) siteUrl.openConnection(); conn.setRequestMethod("POST"); conn.setDoOutput(true); conn.setDoInput(true); DataOutputStream out = new DataOutputStream(conn.getOutputStream()); Set keys = data.keySet(); Iterator keyIter = keys.iterator(); String content = ""; for (int i = 0; keyIter.hasNext(); i++) { Object key = keyIter.next(); if (i != 0) { content += "&"; } content += key + "=" + URLEncoder.encode(data.get(key), "UTF-8"); } System.out.println(content); out.writeBytes(content); out.flush(); out.close(); BufferedReader in = new BufferedReader(new InputStreamReader( conn.getInputStream())); String line = ""; while ((line = in.readLine()) != null) { System.out.println(line); } in.close(); } The PHP script:
When I try to upload, the image is corrupt. When I open the .png with notepad, I see that everything is the same as the local file except there are '\0's instead of 'NUL's

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