You can take the airport shuttle bus to the Hangzhou Railway Station, the earliest train leave from Hangzhou at 07:40 to Shanghai South Railway Station, you can live in this area and catch the train in the morning. If you are in a hurry, you can take taxi to the Hangzhou South Railway Station. It takes about 20 minutes and costs CNY60, there you can take train to Shanghai,the earliest one is at 01:44 and arrive at the Shanghai South Railway Station.