You can take thedirect bus from Wulinmen, Hangzhou to Shanghai Pudong airport. The detailed information of the bus is as the following:
Departure time from Wulinmen: 06:00, 07:30, 09:00, 10:30, 12:00, 13:30, 15:00, 16:00
Ticket fare: CNY85
Time duration: 3.5 hours
Or you can take the high speed train from Hangzhou to Shanghai Hongqiao train station and then take subway line 2 to the airport. The train journey is about one hour and the train ticket fare is about CNY82/131.