There are no resources that can be added or removed from the server

eclipse導入一個項目後，不能加載到tomcat裏面，出現“There are no resources that can be added or removed from the server.”

解決方法：
第1步、新建一個“Dynamic Web Project”

第2步、把新建項目裏面的.project文件和.settings文件夾複製到導入的那個項目裏面。