1. 项目右键 -->Properties
2. Java Build Path
a) Projects --> Add
b) Required Project Selection --> Select projects to add: --> 选中想要引入的项目
c) Order and Export --> 选中想要引入的项目
3. Project references --> 选中想要引入的项目
4. Deployment Assembly
a) Add --> Select Directive Type --> Project --> 选中想要引入的项目 --> finish