When you arrive at Hangzhou Airport, please take the shuttle bus or hire a taxi to reach Hangzhou Railway Station in one hour. If possible, please catch the bullet train D5670 which departs at 14:55 and arrive in Shanghai South Railway Station at 16:18. Then, you could take a taxi to the hotel directly.
If you miss the train, there are buses departing to Shanghai at the east square of Shanghai Railway Station. By bus, you could arrive in Shanghai in 2.5 hours.