Can I fit a trip to downtown Shanghai in a 7 hour gap for a connecting flight to Hainan?

7h can be used for a short trip, and you can take the Maglev to Longyang Rd and then take metro line 2 to East Nanjing Rd. You can wander around the area to enjoy the pedestrian street, the bund and people’s square. Then, use the metro line 2 & maglev back to the airport. Note you are suggested to back to the airport 2h earlier.