javax.servlet.annotation.webfilter 报错

eclipse报错：

The import javax.servlet.annotation cannot be resolved

Multiple markers at this line
- WebFilter cannot be resolved to a type
- The attribute value is undefined for the annotation type 

解决方法：右击工程- build path- configure build path- add external jars- 然后添加运行工程的那个tomcat的bin文件夹中的servlet-api.jar包。