public  long getFileSize(String sURL) {         int nFileLength = -1;         try {             URL url = new URL(sURL);             HttpURLConnection httpConnection = (HttpURLConnection) url             .openConnection();             httpConnection.setRequestProperty("User-Agent", "Internet Explorer");             int responseCode = httpConnection.getResponseCode();             if (responseCode >= 400) {                 System.err.println("Error Code : " + responseCode);                 return -2; // -2 represent access is error             }             String sHeader;             for (int i = 1;; i++) {                 sHeader = httpConnection.getHeaderFieldKey(i);                 if(null != sHeader){                                        System.out.println(sHeader);                }                if (sHeader != null) {                     if (sHeader.equals("Content-Length")) {                         nFileLength = Integer.parseInt(httpConnection                                 .getHeaderField(sHeader));                         break;                     }                 } else                     break;             }         } catch (IOException e) {             e.printStackTrace();         } catch (Exception e) {             e.printStackTrace();         }         System.out.println(nFileLength);         return nFileLength;     }