在classpath里设定
C:\Program Files\Programmer\JBuilder8\jdk1.4\jre\lib\ext\mail.jar
C:\Program Files\Programmer\JBuilder8\jdk1.4\jre\lib\ext\activation.jar
C:\Program Files\Programmer\JBuilder8\jdk1.4\jre\lib\ext\mail.jar
C:\Program Files\Programmer\JBuilder8\jdk1.4\jre\lib\ext\activation.jar
变量值: .;F:\Java\jdk1.4\jre\lib\ext\activation.jar;F:\Java\jdk1.4\jre\lib\ext\mail.jar
其中F:\Java\jdk1.4\jre\lib\ext为我放activation.jar jarmail.jar的目录
嘿嘿,原来我的jbuilder的tool还要添加那几个jar文件。