Java：获取MIME多部分BodyPart的内容

Question

我试图使用BodyPart检索MIME multipart的内容，如下所示

ByteArrayOutputStream baos = null;
MimeMultipart mp = new MimeMultipart(new ByteArrayDataSource(inputStream, contentType));
int count = mp.getCount();
baos = new ByteArrayOutputStream();

for (int i = 0; i < count; i++) {
    BodyPart bodyPart = mp.getBodyPart(i);
    Object content = bodyPart.getContent();
    if (content instanceof InputStream) {

         // process inputStream

     }

bodyPart.writeTo(MIMEbaos);
String attachment = MIMEbaos.toString();

}

但是当附件包含整个MIME多部分主体部分时，art.getContent（）提供与整个MIME消息相同的InputStream（没有内容类型、边界等），包括内容类型等。

InputStream来自

ByteArrayOutputStream baos = new ByteArrayOutputStream();
msg.writeTo(baos);

byte[] bytes = baos.toByteArray();
InputStream inputStream = new ByteArrayInputStream(bytes);

其中msg是SOAPMessageMIME类型为MTOM

Answer 1

我的结局是

ByteArrayOutputStream baos = null;
MimeMultipart mp = new MimeMultipart(new ByteArrayDataSource(inputStream, contentType));
int count = mp.getCount();
baos = new ByteArrayOutputStream();

for (int i = 0; i < count; i++) {
    BodyPart bodyPart = mp.getBodyPart(i);
    Object content = bodyPart.getContent();
    String content = new String(read(bodyPart));

    String partContentType =  bodyPart.getContentType();
}

bodyPart.writeTo(MIMEbaos);
String attachment = MIMEbaos.toString();

    private static byte[] read(BodyPart bodyPart) throws MessagingException, IOException
    {
        InputStream inputStream = bodyPart.getInputStream();
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

        int data = 0;
        byte[] buffer = new byte[1024];

        while ((data = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, data);
        }

        return outputStream.toByteArray();
    }