Do not recommend land, recommend water. Take a bus from the bus station (20 yuan can take a taxi) to Xiamen Tourist Passenger Station, then take a boat (12 yuan, 15 minutes) to zhangzhou port, and then take a bus (2 yuan, 10 minutes) to Zhangzhou Campus. This is the most convenient and time-saving.
Xiamen has Hubin South Bus Station, Songbai Bus Station and Xiamen Railway Station.