我正在尝试以这种方式发送邮件：
Properties props = new Properties();
props.setProperty("mail.transport.protocol", "smtp");
props.setProperty("mail.host", "out.alice.it");
props.setProperty("mail.user", "[email protected] /cdn-cgi/l/email-protection");
props.setProperty("mail.password", "*****");
Session mailSession = Session.getDefaultInstance(props, null);
Transport transport = mailSession.getTransport();
MimeMessage message = new MimeMessage(mailSession);
message.setFrom(new InternetAddress("Host", "Name"));
在行上Transport transport...我检索到这个错误：
javax.mail.NoSuchProviderException: Invalid protocol: null
at javax.mail.Session.getProvider(Session.java:440)
at javax.mail.Session.getTransport(Session.java:659)
at javax.mail.Session.getTransport(Session.java:640)
at javax.mail.Session.getTransport(Session.java:626)
at Mail.sendMail(Mail.java:151)
我该如何解决？有人能帮我吗？谢谢！！ :)
EDIT:
如果我创建一个 main 并启动该方法来发送邮件，效果很好！
当我将邮件读入邮件文件夹后，我的问题出现了：
Properties properties = System.getProperties();
properties.setProperty("mail.store.protocol", "imap");
Session session = Session.getDefaultInstance(properties, null);
Store store = session.getStore("pop3");
store.connect("pop3.domain.it", "[email protected] /cdn-cgi/l/email-protection", "****");
Folder inbox = store.getFolder("inbox");
FlagTerm ft = new FlagTerm(new Flags(Flags.Flag.SEEN), false);
inbox.open(Folder.READ_ONLY);
Message messages[] = inbox.search(ft);
for(Message message:messages) {
if(message.getFrom()[0].toString().equals("aMail")){
sendMail(message.getFrom()[0].toString());//Error!
}
}
我认为异常的产生是因为我打开了商店来获取收件箱邮件，所以我以这种方式编辑：
ArrayList<String> reply = new ArrayList<String();
for(Message message:messages) {
if(message.getFrom()[0].toString().equals("aMail")){
reply.add(message.getFrom()[0].toString());
}
}
store.close();
for(String mail : reply){
sendMail(mail); // ERROR AGAIN!
}
很奇怪....
这样解决：
我修改了这一行
Session mailSession = Session.getDefaultInstance(props, null);
to
Session mailSession = Session.getInstance(props);
