解决方法: 有两种解决方法: 1)手动刷新。即在eclipse的工程目录中,右键refresh(或者按下F5)。 2)配置eclipse的选项: a)eclipse启动时,刷新workspace,即勾选:window—>preferences—>general—>startup and shutdown—>refresh workspace on startup; b)window—>preferences—>general—>workspace中:勾选选项:refresh using native hooks or polling和refresh on access; 必要时重启 eclipse。OK.