Which compus of Zhejiang Forestry University do you mean? One is in Huangcheng Beilu and it also has compus in Lin'an. Any of them do not have direct bus to the airport. Suggest you take airport bus to Wulingmen firest and then change to taxi and bus to the place you want. The airport is 27km or so from Huangcheng Beilu and over 90km from the compus in Lin'an.