daoIntf=new DAOImpl();
    document = daoIntf.getEntity("Document", id);
    Blob docBlob=(Blob)document.getProperty("resume");
    String fileName=(String)document.getProperty("fileName");
    String contentType=(String)document.getProperty("contentType");
    response.setContentType(contentType);
    response.setHeader("Pragma" , "no-cache");
    response.setHeader("Cache-Control" , "no-cache");
    response.setDateHeader("Expires" , 0);
    response.setHeader("Content-Disposition" , "inline;filename=""+fileName+""");
    ServletOutputStream out = response.getOutputStream();
    out.write(docBlob.getBytes());

http://docs.google.com/viewer?url=<url_of_your_document>&embedded=<true|false>