Validation Issues & Image submission In JSP project.

Question

I am new to jsp and I am trying to make an apllication form in jsp which saves the details of the member in the mysql . Connectivity part is done it is taking in the details and saving them to mysql DB , issue is that few columns like pincode , mobile number & fax  ,validation is not working with them .

Please suggest me how to add validation to these columns .

Also I am trying to save the image of the applicant but it takes the image as an attachment and when I try to fetch the data from DB it only shows the attachment not the image .