怎么会找不到import 文件
Note: sun.tools.javac.Main has been deprecated.
D:\ttzfproject\ttzf3.8\WEB-INF\classes\com\company\util\SendMail.java:5:
Package javax.mail not found in import.
import javax.mail.*;
^
D:\ttzfproject\ttzf3.8\WEB-INF\classes\com\company\util\SendMail.java:6:
Package javax.mail.internet not found in import.
import javax.mail.internet.*;
^
D:\ttzfproject\ttzf3.8\WEB-INF\classes\com\company\util\SendMail.java:7:
Package javax.activation not found in import.
import javax.activation.*;
这些java文件,是我从另外一个目录上copy过来的,而且在原来的目录是可以用的,为什么现在找不到了呢?