public class DbConnection {
    public Connection Connect(){
        try {
            String url="jdbc:sqlserver://localhost:1433;databaseName=BdAula3";
            String user="sa";
            String password="sa2012";
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
            Connection conn=DriverManager.getConnection(url, user, password);
            return conn;
        } catch (ClassNotFoundException | SQLException ex) {
            Logger.getLogger(DbConnection.class.getName()).log(Level.SEVERE, null, ex);
        }
        return null;
    }
}