报错java.lang.IllegalStateException: Folder is not Open
at com.sun.mail.pop3.POP3Folder.checkOpen(POP3Folder.java:547)
at com.sun.mail.pop3.POP3Folder.getProtocol(POP3Folder.java:577)
at com.sun.mail.pop3.POP3Message.loadHeaders(POP3Message.java:606)
at com.sun.mail.pop3.POP3Message.getAllHeaders(POP3Message.java:452)
at mailutil.GetMail.getMailInfo(GetMail.java:136)
at utils.ReceiveMailTable.mailToTable(ReceiveMailTable.java:79)
at utils.ReceiveMailTable.run(ReceiveMailTable.java:73)