如何从 Java 中的 GMail 帐户的收件箱中读取电子邮件?

How to read e-mails from inbox of a GMail account in Java?

我需要阅读来自 Gmail 帐户的电子邮件。我写了下面的代码:

public class ReadResponseToEmailTest {
    @Test
    public void testGmailConnection() throws MessagingException {
        Folder emailFolder = null;
        Store store = null;
        try {
            //create properties field
            Properties properties = new Properties();

            properties.put("mail.pop3.host", "pop.gmail.com");
            properties.put("mail.pop3.port", Integer.toString(995));
            properties.put("mail.pop3.starttls.enable", "true");

            Session emailSession = Session.getDefaultInstance(properties);

            //create the POP3 store object and connect with the pop server

            store = emailSession.getStore("pop3s");

            store.connect("pop.gmail.com", "myemail@gmail.com", "XXXXXXXX");

            //create the folder object and open it

            emailFolder = store.getFolder("INBOX");
            emailFolder.open(Folder.READ_ONLY);

            // retrieve the messages from the folder in an array and print it
            Message foundMessage = null;
            Message[] messages = emailFolder.getMessages();
            for (final Message msg : messages) {
                final String subject = msg.getSubject();
            }
        }
        finally {
            if (emailFolder != null) {
                emailFolder.close(false);
            }
            if (store != null) {
                store.close();
            }
        }

    }
}

messages 仅包含旧邮件。此外,这些邮件中的大多数不在收件箱中,而是已存档。

我需要如何更改以上代码才能从 GMail 的收件箱中读取电子邮件(尤其是最近收到的电子邮件)?

检查您的 gmail 帐户设置:

  • 点击右上角的设置⚙⇒查看所有设置

  • 单击转发和POP/IMAP选项卡。

  • 所有邮件启用 POP(甚至已经下载的邮件)

  • 同时尝试检查第二个单选按钮:为从现在起到达的邮件启用 POP 以不接收存档邮件。

参见:Read Gmail messages on other email clients using POP - Gmail Help