Where are you from? If you from several foreign country you can use airplane directly to Bandung's Hussein Sastranegara Airport or via Soekarno Hatta International Airport, Jakarta.
For land transport option, many way are available. Buses, trains, or by car. By land You can reach Bandung within 2 hours (estimated by 150kms direct highway) or faster from Jakarta.
Malaysia, Singapore, and several countries have regular flight to Bandung. Besides international flight, Bandung's airport serve flights to and from other major cities in Indonesia, like Jakarta, Surabaya, Semarang, Denpasar, Sampit.
As Jakarta to Bandung is a popular route, you may find many options to get there.
TRAIN
Jakarta to Bandung
You may take a train from Jakarta to Bandung via many trains and times as this is a very popular route. There are also trains from the other side of Java towards Bandung, mainly places like Yogyakarta or Purwokerto.
BUS
You may also take the many bus from Jakarta to Bandung, again with many choices of operators and time due to its high demand. But the most convenient and comfortable bus is the non-stop air conditioned bus (express bus). Main bus terminal in Bandung is Leuwipanjang, with buses from Jakarta, Bogor and surrounding while the other bus terminal Cicaheum has buses coming from Cirebon, Banjarm Pangandaran and even Bali islands.
FLIGHT
If you want to fly into Bandung, the international airport is Husein Sastranegara with several airlines serving this route for international flights like Air Asia, Batavia Air, Garuda indonesia, Silk Air and also domestic flights like Lion Air or Merpati Nusantara Airlines. Bandung Indonesia airport is close to the city center with taxi fixed at 43000Rp.
CAR
If you would brave the traffic in Jakarta or probably coming from elsewhere, you may drive from Jakarta to Bandung in just 2 hours. Just take note of possibility of floods during rainy season and really heavy traffic jams during weekends. You may take a further alternative route via Puncak and Cianjur if you have the time and have a pit stop at the highland for a view of tea plantation before continuing. Here you may also check out Bogor and the Taman Safari Indonesia.
TAXI
If you do not want to drive but still take the car, it is possible to hire a taxi to take you there, be it with meters or a fix price but beware of being overcharged or scammed.