我有一个包含 GUI 的应用程序,它使用 Javamail。当我打开这个 Jframe
时,我必须看到发送到我在 jTextArea
上的邮件的消息。
问题是当我编写代码时它只显示最后发送的消息。
如何在我的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);
}
最佳答案
您在此处的消息循环中将 jTextArea1
的文本重复设置为相同的内容:
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());
}
您应该构建一个包含所有消息的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,您可以使用增强的 for 循环和使用 StringBuilder
的 append
方法使它更清晰。
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());
关于java - 使用 javamail 从我的 gmail 中读取所有新邮件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15906799/