Java: get content of MIME multipart BodyPart

Question

I'm trying to retrieve content of MIME multipart using BodyPart as follow

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();

}

But bodyPart.getContent() is providing the same InputStream as whole MIME message when I expect just a content (without content-type, boundaries etc) when attachment contains whole MIME multipart body section including content-type, etc.

InputStream is from

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

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

where msg is SOAPMessage MIME type as MTOM

What, exactly, are the expected results? What are you seeing instead? — VGR
@VGR bodyPart.getDisposition() comes as null and bodyPart.getContent() comes as Byte Array Input Stream not a String. I'm expecting, at least for bodyPart.getContent() to see current content (plain) of the MIME multipart w/o related headers. — JackTheKnife
Where does inputStream come from? Are you sure it’s a multi-part MIME message? — VGR
@VGR Yeah, incoming message is a MTOM and I need to get a content for each of part of it. Added more code to the OP — JackTheKnife

JackTheKnife JackTheKnife · Accepted Answer · 2018-12-19T14:15:01

I have ended up with

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();
    }

Java: get content of MIME multipart BodyPart

1 Answers