problems with writing from file to blob

[Pounce]

I`m writing from file to blob. Than I need to get blob content again
and write it to file. When I open this file, I see the wrong symbols.
Can anybody help me?
Here is my code:


////////////////////////////
to update file content
///////////////////////////


private void updateFileContent(File serverFile, java.io.File
clientContentFile) throws MainException
{
PreparedStatement preparedStatement = null;
try
{


connection = connect();
String query = "update panta_file_substance\n" +
"set content = ?\n" +
"where\n" +
" file_id = ?"
preparedStatement = getPreparedStatement
(query, connection);


int fileLenght = (int) clientContentFile.length();
InputStream is = new FileInputStream(clientContentFile);
preparedStatement.setBinaryStream(1, is, fileLenght);
preparedStatement.setLong( 2,
serverFile.getId().longValue() );
int result = preparedStatement.executeUpdate();
is.close();
}
catch (SQLException e)
{ throw new MainException(e.getMessage(), e); }


catch (FileNotFoundException e)
{ throw new MainException(e.getMessage(), e); }


catch (IOException e)
{ throw new MainException(e.getMessage(), e); }


finally
{
disconnect(null, preparedStatement, null);
}
}


//////////////////////////////////////////////////////////////////////////

to get file
/////////////////////////////////////////////////////////////////////////



public static void getFile(Connection connection) throws
SQLException
{
String query = "select \n" +
" panta_file_substance.content \n" +
"from \n" +
" panta_file_substance\n" +
"where \n" +
" file_id=?";
PreparedStatement preparedStatement = connection.
prepareStatement(ServerSQLProjectDAO.getFileContent());
preparedStatement.setLong(1, 7801295236381635588l);
ResultSet resultSet = preparedStatement.executeQuery();
Blob content = null;
if (resultSet.next())
{
content = (Blob) resultSet.getBlob("CONTENT");
}
java.io.File contentffFile = new java.io.File("C:\\Temp\\new");

try
{
OutputStream os = new FileOutputStream(contentffFile);
int bufferSize = 2048;
byte[] array = new byte[bufferSize];
BufferedOutputStream bos = new BufferedOutputStream(os,
bufferSize);


InputStream is = content.getBinaryStream();
BufferedInputStream bis = new BufferedInputStream(is);


int nBytes;


while ((nBytes = bis.read(array)) != -1)
bos.write(array, 0, nBytes);


bos.close();
bis.close();
}
catch (IOException e)
{
e.printStackTrace();
}


}