Java Mail API - 无法正确设置端口

Question

如上所述here here ，和here ，您应该多用少用，始终使用 Java Mail API 的 getInstance() 方法来正确设置属性。

让我们检查一下我的代码:

[...]
Properties properties = new Properties();
properties.put("mail.store.protocol", "imaps");
properties.put("mail.imap.port", "143");
properties.put("mail.imap.ssl.enable", "true");  
properties.put("mail.imaps.partialfetch", "false");
properties.put("mail.mime.base64.ignoreerrors", "true");

Session session = Session.getInstance(properties);
session.setDebug(true);
Store store = session.getStore("imaps");
store.connect(host, userName, password);

Folder imapFolder = store.getFolder(folderName);
imapFolder.open(Folder.READ_WRITE);


Message[] messages = imapFolder.search(new FlagTerm(new 
lags(Flags.Flag.SEEN), false));

[...]

看到我的端口属性设置为“143”吗？让我们跳转到邮件 api 调试控制台输出:

DEBUG: setDebug: JavaMail version 1.5.6
DEBUG: getProvider() returning javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle]
DEBUG IMAPS: mail.imap.partialfetch: false
DEBUG IMAPS: mail.imap.ignorebodystructuresize: false
DEBUG IMAPS: mail.imap.statuscachetimeout: 1000
DEBUG IMAPS: mail.imap.appendbuffersize: -1
DEBUG IMAPS: mail.imap.minidletime: 10
DEBUG IMAPS: closeFoldersOnStoreFailure
DEBUG IMAPS: trying to connect to host "imap.gmail.com", port 993, isSSL true
* OK Gimap ready for requests from 213.189.150.34 r25-v6mb373781038edd
A0 CAPABILITY
* CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA ID XLIST CHILDREN X-GM-EXT-1 XYZZY SASL-IR AUTH=XOAUTH2 AUTH=PLAIN AUTH=PLAIN-CLIENTTOKEN AUTH=OAUTHBEARER AUTH=XOAUTH
A0 OK Thats all she wrote! r25-v6mb373781038edd
DEBUG IMAPS: AUTH: XOAUTH2
DEBUG IMAPS: AUTH: PLAIN
DEBUG IMAPS: AUTH: PLAIN-CLIENTTOKEN
DEBUG IMAPS: AUTH: OAUTHBEARER
DEBUG IMAPS: AUTH: XOAUTH
DEBUG IMAPS: protocolConnect login, host=imap.gmail.com, user="myuser", password="mypassword"
DEBUG IMAPS: AUTHENTICATE PLAIN command trace suppressed
DEBUG IMAPS: AUTHENTICATE PLAIN command result: A1 OK "myuser" authenticated (Success)
A2 CAPABILITY
* CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA ID XLIST CHILDREN X-GM-EXT-1 UIDPLUS COMPRESS=DEFLATE ENABLE MOVE CONDSTORE ESEARCH UTF8=ACCEPT LIST-EXTENDED LIST-STATUS LITERAL- SPECIAL-USE APPENDLIMIT=35651584
A2 OK Success
DEBUG IMAPS: connection available -- size: 1
A3 SELECT WhiteListedMembers
* FLAGS (\Answered \Flagged \Draft \Deleted \Seen $NotPhishing $Phishing)
* OK [PERMANENTFLAGS (\Answered \Flagged \Draft \Deleted \Seen $NotPhishing $Phishing \*)] Flags permitted.
* OK [UIDVALIDITY 12] UIDs valid.
* 379 EXISTS
* 0 RECENT
* OK [UIDNEXT 386] Predicted next UID.
* OK [HIGHESTMODSEQ 65275]
A3 OK [READ-WRITE] WhiteListedMembers selected. (Success)
A4 SEARCH UNSEEN ALL
* SEARCH
A4 OK SEARCH completed (Success)
Unreaded messages in inbox: 0
A5 UNSELECT
A5 OK Returned to authenticated state. (Success)
DEBUG IMAPS: added an Authenticated connection -- size: 1
A6 LOGOUT

我的问题是:为什么java mail api仍然使用端口993？是否有自动端口映射？我就是无法理解这一点。

有人可以阐明这一点吗？

非常感谢您的回答和您的赞助时间。

最诚挚的问候马特

操作系统:Windows 10、Eclipse Oxygen 4.7.0、Java Oracle JRE 1.8.0 131、Java Mail API 1.5.6

Answer 1

您真的在端口 143 上运行 IMAP-with-SSL 吗？这充其量只是“不寻常”。

如果您使用默认端口，则无需设置端口属性。只需使用“imap”协议(protocol)并设置“mail.imap.ssl.enable”属性，JavaMail 将选择正确的默认端口。