commons(怎么导入apacheiocommons)

commons，怎么导入apacheiocommons？

importorg.apache.tomcat.util.http.fileupload.FileItem;importorg.apache.tomcat.util.http.fileupload.FileItemFactory;importorg.apache.tomcat.util.http.fileupload.FileUploadException;importorg.apache.tomcat.util.http.fileupload.disk.DiskFileItemFactory;importorg.apache.tomcat.util.http.fileupload.servlet.ServletFileUpload；就是下面出现红线，不知道如何导入