java mail获取邮件正文方法

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之前用java mail获取content都是空，后来发现类型是Multipart，而且里面有好几层

正确的获取邮件正文代码如下

public static String parseMultipart(Multipart multipart) throws MessagingException, IOException {
        StringBuffer bodyText = new StringBuffer();
        int count = multipart.getCount();
        for (int idx = 0; idx < count; idx++) {
            BodyPart bodyPart = multipart.getBodyPart(idx);
            if (bodyPart.isMimeType("text/plain")) {
                bodyText.append(bodyPart.getContent());
            } else if (bodyPart.isMimeType("text/html")) {
                bodyText.append(bodyPart.getContent());
            } else if (bodyPart.isMimeType("multipart/*")) {
                Multipart mpart = (Multipart) bodyPart.getContent();
                parseMultipart(mpart);
            } else if (bodyPart.isMimeType("application/octet-stream")) {
                String disposition = bodyPart.getDisposition();
                if (disposition.equalsIgnoreCase(BodyPart.ATTACHMENT)) {
                    InputStream is = bodyPart.getInputStream();
                    ByteArrayOutputStream baos=new ByteArrayOutputStream();
                    copy(is, baos);
                    bodyText.append(new String(baos.toByteArray()));
                }
            }
        }
        return bodyText.toString();
    }