FileCopyUtils

/**
  * Copy the contents of the given InputStream to the given OutputStream.
  * Closes both streams when done.
  * @param in the stream to copy from
  * @param out the stream to copy to
  * @return the number of bytes copied
  * @throws IOException in case of I/O errors
  */
 public static int copy(InputStream in, OutputStream out) throws IOException {
  Assert.notNull(in, "No InputStream specified");
  Assert.notNull(out, "No OutputStream specified");
  try {
   int byteCount = 0;
   byte[] buffer = new byte[BUFFER_SIZE];
   int bytesRead = -1;
   while ((bytesRead = in.read(buffer)) != -1) {
    out.write(buffer, 0, bytesRead);
    byteCount += bytesRead;
   }
   out.flush();
   return byteCount;
  }
  finally {
   try {
    in.close();
   }
   catch (IOException ex) {
   }
   try {
    out.close();
   }
   catch (IOException ex) {
   }
  }
 }