2

我有一个包含 GUI 的应用程序，它使用 Javamail。当我打开这个时Jframe，我必须看到发送到我的邮件的消息jTextArea。

问题是当我编写代码时，它只显示发送的最后一条消息。

如何在收件箱中显示所有新邮件？

这是我的代码：

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {

Properties props = new Properties();

props.put("mail.pop3.host", "pop.gmail.com");

props.put("mail.pop3.user", "mymail@gmail.com");

props.put("mail.pop3.socketFactory", 995);

props.put("mail.pop3.socketFactory.class", "javax.net.ssl.SSLSocketFactory");

props.put("mail.pop3.port", 995);

Session session = Session.getDefaultInstance(props, new Authenticator() {
    @Override
    protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication("mymail@gmail.com", "mypassword");

    }
});

try {
    Store store = session.getStore("pop3");

    store.connect("pop.gmail.com", "mymail@gmail.com", "mypaswword");

    Folder fldr = store.getFolder("INBOX");

    fldr.open(Folder.READ_ONLY);

    Message[] msg = fldr.getMessages();

    Address[] address;


    for (int i = 0; i < msg.length; i++) {

        jTextArea1.setText("SentDate : " + msg[i].getSentDate() + "\n" + "From : " + msg[i].getFrom()[0] + "\n" + "Subject : " + msg[i].getSubject() + "\n" + "Message : " + "\n" + msg[i].getContent().toString());

    }

    fldr.close(true);

    store.close();

} catch (Exception e) {
    System.out.println(e);
}
4

2 回答 2

0

jTextArea1您在此处的消息循环中重复将 的文本设置为相同的内容：

for (int i = 0; i < msg.length; i++) {

    jTextArea1.setText("SentDate : " + msg[i].getSentDate() + "\n" + "From : " + msg[i].getFrom()[0] + "\n" + "Subject : " + msg[i].getSubject() + "\n" + "Message : " + "\n" + msg[i].getContent().toString());

}

您应该使用所有消息构建一个StringBuilder，然后设置jTextArea1

final StringBuilder sb = new StringBuilder();
for (int i = 0; i < msg.length; i++) {

    sb.append("SentDate : " + msg[i].getSentDate() + "\n" + "From : " + msg[i].getFrom()[0] + "\n" + "Subject : " + msg[i].getSubject() + "\n" + "Message : " + "\n" + msg[i].getContent().toString());

}
jTextArea1.setText(sb.toString());

然后，您可以通过使用增强的 for 循环和append使用StringBuilder.

final StringBuilder sb = new StringBuilder();
for (Message message : msg) {

    sb.append("SentDate : ").
            append(message.getSentDate()).
            append("\n").
            append("From : ").
            append(message.getFrom()[0]).
            append("\n").append("Subject : ").
            append(message.getSubject()).
            append("\n").
            append("Message : ").
            append("\n").
            append(message.getContent().toString());

}
jTextArea1.setText(sb.toString());
于 2013-04-09T16:18:07.257 回答
0 
final StringBuilder sb = new StringBuilder();
for (Message message : msg) {

    sb.append("SentDate : ").
        append(message.getSentDate()).
        append("\n").
        append("From : ").
        append(message.getFrom()[0]).
        append("\n").append("Subject : ").
        append(message.getSubject()).
        append("\n").
        append("Message : ").
        append("\n").
        append(message.getContent().toString());

}
jTextArea1.setText(sb.toString());
于 2013-11-17T19:57:46.823 回答