Apex EDI Developers

public static String DoHTTPFilePost(String fileName, String urlString, ArrayList errors)
    {
        String retVal = "";
        HttpsURLConnection conn = null;
        DataOutputStream dos = null;
        DataInputStream inStream = null;
        String lineEnd = System.getProperty("line.separator");
        String twoHyphens = "--";
        String boundary = "*****";
        int bytesRead, bytesAvailable, bufferSize;
        byte[] buffer;
        int maxBufferSize = 1 * 1024 * 1024;
        try
            {
                // ------------------ CLIENT REQUEST
                FileInputStream fileInputStream = new FileInputStream(new File(fileName));
                // open a URL connection to the Servlet
                URL url = new URL(urlString);
                conn = (HttpsURLConnection) url.openConnection();
                // Allow Outputs
                conn.setDoOutput(true);
                // Don't use a cached copy.
                conn.setUseCaches(false);
                // Use a post method.
                conn.setRequestMethod("POST");
                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=\"upload\";" + " filename=\"" + fileName + "\"" + lineEnd);
                dos.writeBytes(lineEnd);
                // create a buffer of maximum size
                bytesAvailable = fileInputStream.available();
                bufferSize = Math.min(bytesAvailable, maxBufferSize);
                buffer = new byte[bufferSize];
                // read file and write it into form...
                bytesRead = fileInputStream.read(buffer, 0, bufferSize);
                while (bytesRead > 0)
                {
                    dos.write(buffer, 0, bufferSize);
                    bytesAvailable = fileInputStream.available();
                    bufferSize = Math.min(bytesAvailable, maxBufferSize);
                    bytesRead = fileInputStream.read(buffer, 0, bufferSize);
                }
            // send multipart form data necesssary after file data...
            dos.writeBytes(lineEnd);
            dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
            // close streams
            fileInputStream.close();
            dos.flush();
            dos.close();
        }
        catch (MalformedURLException ex)
            {
                errors.add(ex.getMessage());
            }
        catch (IOException ioe)
            {
                errors.add(ioe.getMessage());
            }
        // ------------------ read the SERVER RESPONSE
        try
            {
                inStream = new DataInputStream(conn.getInputStream());
                String str;
                StringBuilder sb = new StringBuilder();
                    while ((str = inStream.readLine()) != null)
                    {
                        sb.append(str);
                        //System.out.println("Server response is: " + str);
                        //System.out.println("");
                    }
                inStream.close();
                retVal = sb.toString();
            }
        catch (IOException ioex)
            {
                errors.add(ioex.getMessage());
            }
        System.out.println(retVal);
        return retVal;
    }