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我正在尝试使用 java 邮件 API 和 IAIK 压缩 MIME 消息。我编写了以下代码：

MimeBodyPart wrappedMessage = new MimeBodyPart(new InternetHeaders(), content);
CompressedContent compressed = new CompressedContent();
compressed.setDataHandler(wrappedMessage.getDataHandler());
compressed.setCompressionAlgorithm((AlgorithmID) CMSAlgorithmID.zlib_compress.clone());

String contentType = compressed.getContentType();
compressed.setHeaders(wrappedMessage);
wrappedMessage.setContent(compressed, contentType);

setLocalCommandMap(wrappedMessage.getDataHandler()); //I'm setting IAIK command map

ByteArrayOutputStream baos = new ByteArrayOutputStream();
wrappedMessage.writeTo(baos);
byte[] ret = baos.toByteArray();

上面的代码在 java mail api 1.5.2 中运行良好，但在 java mail api 1.4.5 中出现以下异常：

java.io.IOException: javax.mail.MessagingException: javax.mail.MessagingException: No MimeMessage content
    at iaik.smime.encrypted_content.writeTo(Unknown Source)
    at javax.activation.ObjectDataContentHandler.writeTo(Unknown Source)
    at javax.activation.DataHandler.writeTo(Unknown Source)
    at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1485)
    at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:865)
    at CompressionTest.main(CompressionTest.java:34)

我的 iaik cms 版本是 4.1。知道我需要更改代码以使其与 java mail api 1.4.5 兼容吗？

谢谢

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