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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>消息的轉(zhuǎn)發(fā)</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 7 頁（共9 頁）</nobr></font></td>
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<p>轉(zhuǎn)發(fā)消息有一點棘手。沒有單獨的方法可以調(diào)用，您通過對組成消息各部分的處理來組織要轉(zhuǎn)發(fā)的消息。</p>
<p>一條郵件消息可以由多個部分組成。在處理 MIME 消息時，消息中每部分都是 <code><a href="http://java.sun.com/products/javamail/javadocs/javax/mail/BodyPart.html">BodyPart</a></code>，再特殊些，是 <code> <a href="http://java.sun.com/products/javamail/javadocs/javax/mail/internet/MimeBodyPart.html">MimeBodyPart</a></code>。不同的 body part（信體部件或正文部件）結(jié)合成一個容器，名為 <code><a href="http://java.sun.com/products/javamail/javadocs/javax/mail/Multipart.html">Multipart</a></code>，再特殊些，就是 <code> <a href="http://java.sun.com/products/javamail/javadocs/javax/mail/internet/MimeMultipart.html">MimeMultipart</a></code>。要轉(zhuǎn)發(fā)一條消息，您為自己的消息正文創(chuàng)建一個部件，要轉(zhuǎn)發(fā)的消息作為另一部件。并且將兩個部件結(jié)合成一個 multipart（多部件）。然后您將這個 multipart 添加到一則已寫好恰當?shù)刂返南⒅校l(fā)送。</p>
<p>本質(zhì)上就是如此。要將一條消息內(nèi)容復制到另一條，只要復制 <code><a href="http://java.sun.com/products/javabeans/glasgow/javadocs/javax/activation/DataHandler.html">DataHandler</a></code> （JavaBeans Activation Framework 中的類）就行了。</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
// Create the message to forward
Message forward = new MimeMessage(session);

// Fill in header
forward.setSubject("Fwd: " + message.getSubject());
forward.setFrom(new InternetAddress(from));
forward.addRecipient(Message.RecipientType.TO,
  new InternetAddress(to));

// Create your new message part
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setText(
  "Here you go with the original message:\n\n");

// Create a multi-part to combine the parts
Multipart multipart = new MimeMultipart();
multipart.addBodyPart(messageBodyPart);

// Create and fill part for the forwarded content
messageBodyPart = new MimeBodyPart();
messageBodyPart.setDataHandler(message.getDataHandler());

// Add part to multi part
multipart.addBodyPart(messageBodyPart);

// Associate multi-part with message
forward.setContent(multipart);

// Send message
Transport.send(forward);
</code>
</pre>
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