The community train line is another option to travel from and to the Barcelona Airpot. It is fast, numerous stops are available on the RENFE line and it is cheaper than the Airbus Shuttle.
There is a very detailed information about the stops on the route and the schedule of the trains at the RENFE official web-site:
RENFE Barcelona
If there is no direct stop on the location you need to go to, you can easily transfer on some of the Metro lines and get there easy and fast.
Price: 3.60 EUR
Can be used for free with the Barcelona Card
The train is a great way to transfer, especially from T2.
ОтговорИзтриванеIf you're looking for other options then I wrote a blogpost about Airport Transfers here:
http://www.travelandleisure.com/travel-blog/carry-on?format=atom