For this, you can get a more detail answer from the department. http://ad.sjsu.edu/contact/contact.html
Write e-mail or call the graduate programs as listed on the contact list.
Base on my past experience, if you do not hold a degree in related field, you most likely will be asked to take some undergraduate courses to fulfill some requirements / prerequisites. If you prefer, you can also get a second bachelor. Many students from non-related field can get a master degree arround 3 years. It's basically depends on you study plan. And you might be able to waive some undergraduate classes if you can prove that you have the knowledge and/or experience. Good luck.