Upload and Donwload JSF + Primefaces + Mysql files

How to recover file name saved as database BLOB and display on screen? I am using a repeat loop, to retrieve, the Valo saved in the database column, but returns memory values ([B@2248bd40):

Another inconsistency, which is occurring is: when the user uploads to the database, the file is successfully saved( any file), but to run the donwload I must inform the code, and only allows the output the file in the extension formatted in the source code (example: pdf, doc, etc.). The problem is, it will only come out according to the defined extension. Do you have any way to perform the donwload of the file in original format, which was saved?

Follows the method:

public void download() {
    ResultSet rs;
    try {

        Connection con = Conexao.getConnection();

        PreparedStatement st = con.prepareStatement("SELECT image FROM uploadfile WHERE codigo = (?) ");
        st.setInt(1, codigo);

        rs = st.executeQuery();
        while (rs.next()) {
            InputStream stream = rs.getBinaryStream("image");
            file = new DefaultStreamedContent(stream, "image/jpg", "Arquivo.pdf");
        }
        con.close();

        FacesMessage message = new FacesMessage("Exito", " File descarregado com sucesso.");
        FacesContext.getCurrentInstance().addMessage(null, message);

    } catch (Exception erro) {
        erro.printStackTrace();
        FacesMessage message = new FacesMessage("Erro ao executar download.");
        FacesContext.getCurrentInstance().addMessage(null, message);
    }
}