LMS: File Transfer download in Java (XML implementation )

/*
© 2010-2013 eBay Inc., All Rights Reserved
Licensed under CDDL 1.0 - http://opensource.org/licenses/cddl1.php
*/

import java.io.*;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;

/**
*/
public class LMS_DownloadFile { 
    private String USERTOKEN = "YOUR TOKEN";
    private String SERVERURL = "https://storage.sandbox.ebay.com/FileTransferService"; 
    private String ATTACHMENT_CONTENTID = "Content-ID: <urn:uuid:.*>";
    private String BOUNDARY = "--MIMEBoundaryurn_uuid_";

    public static void main(String[] args) {

        //INSERT YOUR jobId and refId here
        String jobId = "50000060955";
        String refId = "50000068125";
        new LMS_DownloadFile(). download(jobId, refId, "download3.gzip");
    }

    public LMS_DownloadFile(String serverURL, String userToken) {
        this.USERTOKEN = userToken;
        this.SERVERURL = serverURL;
    }

    public LMS_DownloadFile() {
    }

      /* 
      *  1. send download api request for the given jobID and refId 
      *  2. write the downloaded to the given file downloadFileName
      */  
    private void download(String jobId, String refId, String downloadFileName) { 
        String reqXml = setRequestXml(jobId, refId);
        String response = "";
        try {
            InputStream is = openConnectionFileRequest(reqXml);
            response = getResponseAsString(is);
            FileOutputStream fos = new FileOutputStream(downloadFileName);
            fos.write(getAttachment(response).getBytes("ISO-8859-1"));
            fos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

     /*
      * open SSL https connection and send the POST request    
      */
    private InputStream openConnectionFileRequest(String Xml) throws Exception {
        URL url = new URL(SERVERURL);
        // open SSL https connection
        HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
        conn.setRequestMethod("POST");

        conn.setDoInput(true);
        conn.setDoOutput(true);
        // conn.setRequestProperty("Content-Type", "text/xml");
        // set the required http headers
        conn.setRequestProperty("X-EBAY-SOA-OPERATION-NAME", "downloadFile");
        conn.setRequestProperty("X-EBAY-SOA-SECURITY-TOKEN", USERTOKEN);

        PrintWriter output = new PrintWriter(new OutputStreamWriter(conn.getOutputStream()));
        System.out.println(conn.getURL());
        System.out.println("REQUEST : " + Xml);
        output.println(Xml);
        output.close();
        conn.connect();
        return conn.getInputStream();
    }
     /*
     * read the response from the given input stream
     */  
    private String getResponseAsString(InputStream is) {
        StringBuffer buffer = new StringBuffer();
        char[] buf = new char[4096];
        int len;
        try {
            InputStreamReader isr = new InputStreamReader(is, "ISO-8859-1");
            while ((len = isr.read(buf)) >= 0) {
                buffer.append(buf, 0, len);
            }
        } catch (Exception e) {
        }
        System.out.println("RESPONSE_BODY: " + buffer.toString());
        return buffer.toString();
    }

    public String[] getMultiParts(String str) {
        String[] temp = null;
        temp = str.split(BOUNDARY, -1);
        return temp;
    }

     /*
     *  get attachment part for the given content
     */  
     private String getAttachment(String responseBody) {
        String[] parts = getMultiParts(responseBody);
        String attachment = parts[2];
        String[] temp = null;
        temp = attachment.split(ATTACHMENT_CONTENTID, -1); 
           return temp[1].substring(4, temp[1].length());
    } 

    /*
     *  build request xml payload for given jobId and refId
     */  
    private String setRequestXml(String jobId, String refId) {
        StringBuffer requestXML = new StringBuffer("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
        requestXML.append("<downloadFileRequest xmlns=\"http://www.ebay.com/marketplace/services\">");
        requestXML.append("<RequesterCredentials><eBayAuthToken>"+USERTOKEN+"</eBayAuthToken></RequesterCredentials>");
        requestXML.append("<fileReferenceId>" + refId + "</fileReferenceId>");
        requestXML.append("<taskReferenceId>" + jobId + "</taskReferenceId>");
        requestXML.append("</downloadFileRequest>");
        return requestXML.toString();
    }
}