我想在使用 Javamail 回复电子邮件时修改或删除“Message-ID”标头。经过一番研究，我发现我需要创建一个扩展 MimeMessage 的自定义类。这是我创建的课程。
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.internet.MimeMessage;
class MyMessage extends MimeMessage
{
public MyMessage(Session session)
{
super(session);
}
@Override
protected void updateMessageID() throws MessagingException {
removeHeader("Message-Id");
}
}
下面的代码与获取消息有关
public List<EmailSenderInfo> checkEmail() throws Exception
{
String host = "HOST";
String username = "MYUSERNAME";
String password = "MYPASS";
List<EmailSenderInfo> emailSenderList = new ArrayList<EmailSenderInfo>();
Properties properties = System.getProperties();
properties.setProperty("mail.store.protocol", "imaps");
Session session = Session.getDefaultInstance(properties);
Store store = session.getStore("imaps");
store.connect(host, username, password);
/*
* Folder[] f = store.getDefaultFolder().list(); for (Folder fd : f)
* System.out.println(">> " + fd.getName());
*/
Folder folder = store.getFolder("INBOX");
if (!folder.exists())
{
System.out.println("No INBOX...");
System.exit(0);
}
folder.open(Folder.READ_WRITE);
Message[] msg = folder.getMessages();
if (msg.length < 1)
{
System.out.println("No new messages!");
throw new Exception("No new messages!");
}
for (int i = 0; i < msg.length; i++)
{
if (!msg[i].isSet(Flag.SEEN))
{
EmailSenderInfo emailSenderInfo = new EmailSenderInfo();
emailSenderInfo.message = msg[i];
System.out.println("------------ Message " + (i + 1) + " ------------");
// String from = InternetAddress.toString(msg[i].getFrom());
Address[] fromArray = msg[i].getFrom();
InternetAddress fromInternetAddress = (InternetAddress) fromArray[0];
String from = fromInternetAddress.getAddress();
String fromName = fromInternetAddress.getPersonal();
if (fromName != null)
{
emailSenderInfo.fromName = fromName;
}
if (from != null)
{
// System.out.println("From: " + from);
emailSenderInfo.from = from;
}
// String replyTo = InternetAddress.toString(msg[i].getReplyTo());
Address[] replyToArray = msg[i].getFrom();
InternetAddress ReplyToInternetAddress = (InternetAddress) replyToArray[0];
String replyTo = ReplyToInternetAddress.getAddress();
String replyToName = ReplyToInternetAddress.getPersonal();
if (replyTo != null)
{
// System.out.println("Reply-to: " + replyTo);
emailSenderInfo.replyTo = replyTo;
}
if (replyToName != null)
{
// System.out.println("Reply-to: " + replyTo);
emailSenderInfo.replyToName = replyToName;
}
String to = InternetAddress.toString(msg[i].getRecipients(Message.RecipientType.TO));
if (to != null)
{
// System.out.println("To: " + to);
emailSenderInfo.to = to;
}
String subject = msg[i].getSubject();
if (subject != null)
{
// System.out.println("Subject: " + subject);
emailSenderInfo.subject = subject;
}
Date sentDate = msg[i].getSentDate();
if (sentDate != null)
{
System.out.println("Sent: " + sentDate);
emailSenderInfo.sentDate = sentDate;
}
String bodyHtml = "";
// get content
Multipart multipart = (Multipart) msg[i].getContent();
for (int x = 0; x < multipart.getCount(); x++)
{
BodyPart bodyPart = multipart.getBodyPart(x);
String disposition = bodyPart.getDisposition();
if (Part.ATTACHMENT.equalsIgnoreCase(bodyPart.getDisposition()))
{
// dealing with attachments only
System.out.println("Mail has some attachment : ");
DataHandler handler = bodyPart.getDataHandler();
System.out.println("file name : " + handler.getName());
System.out.println("ddddd: " + bodyPart.getContent().toString());
}
else
{
String classType = bodyPart.getContent().getClass().toString();
if (classType.contains("java.lang.String"))
{
bodyHtml = bodyPart.getContent().toString();
}
else if (classType.contains("javax.mail.internet.MimeMultipart"))
{
MimeMultipart bodyContent = (MimeMultipart) bodyPart.getContent();
for (int b = 0; b < bodyContent.getCount(); b++)
{
IMAPBodyPart imapBody = (IMAPBodyPart) bodyContent.getBodyPart(b);
System.out.println("1: " + imapBody.getContent());
bodyHtml = imapBody.getContent().toString();
// System.out.println("2: " + bodyContent.getBodyPart(b));
// System.out.println("3: " + bodyPart.getContent().toString());
}
}
}
emailSenderInfo.bodyHtml = bodyHtml;
}
MyMessage reply = (MyMessage) msg[i].reply(false);
emailSenderInfo.reply = reply;
// reply.setFrom(msg[i].getFrom()[0]);
MimeMessage orig = (MimeMessage) msg[i];
StringBuffer buffer = new StringBuffer("Thanks\n\n");
if (orig.isMimeType("text/plain"))
{
String content = (String) orig.getContent();
StringReader contentReader = new StringReader(content);
BufferedReader br = new BufferedReader(contentReader);
String contentLine;
while ((contentLine = br.readLine()) != null)
{
buffer.append("> ");
buffer.append(contentLine);
buffer.append("\r\n");
}
}
// Set the reply content
// reply.setText(buffer.toString());
// emailSenderInfo.reply = reply;
emailSenderList.add(emailSenderInfo);
// System.out.println();
}// end if unread
}
folder.close(true);
store.close();
return emailSenderList;
}
我的程序中有两种方法。其中一个检查邮件，另一个回复电子邮件。
Message reply = msg[i].reply(false);
“回复”与其他参数一起传递给此方法。
public void sendReply(String from, String replyTo, Message reply, String messageReply, Boolean attachment) throws Exception
{
String host = "MYHOST";
String username = "MYUSERNAME";
String pass = "MYPASSWORD";
Properties props = System.getProperties();
props.put("mail.smtp.starttls.enable", "true"); // added this line
props.put("mail.smtp.host", host);
props.put("mail.smtp.user", username);
props.put("mail.smtp.password", pass);
props.put("mail.smtp.port", "587");
props.put("mail.smtp.auth", "true");
Session session = Session.getDefaultInstance(props);
MimeMessage mimeReply = (MimeMessage) reply;
mimeReply.setFrom((Address) InternetAddress.parse(from)[0]);
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setContent(messageReply, "text/html");
Multipart multipart = new MimeMultipart();
// Set text message part
multipart.addBodyPart(messageBodyPart);
if (attachment)
{
messageBodyPart = new MimeBodyPart();
String filename = "test.jpg";
DataSource source = new FileDataSource(filename);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(filename);
multipart.addBodyPart(messageBodyPart);
}
mimeReply.setContent(multipart);
Transport transport = session.getTransport("smtp");
transport.connect(host, username, pass);
transport.sendMessage(mimeReply, InternetAddress.parse(replyTo));
transport.close();
System.out.println("Message Sent!");
}
我必须使用 MyMessage 类才能删除“Message-ID”标头。我试过以下
MyMessage mimeReply = (MyMessage) reply;
但是我在运行时收到以下错误
java.lang.ClassCastException: javax.mail.internet.MimeMessage cannot be cast to javamailer.MyMessage
如何使用“MyMessage”类，以便我可以删除带有回复消息的“Message-ID”标头？