How to convert byte[] to message with javax.mail library

Question

Right now I have emails stored in a database, and I need to be able to retrieve them and download attachments If they have them. Currently, I am stumped on a way to convert the byte[] which I have stored the email as into a MailMessage or MimeMessage. I believe I have gotten to the byte[] into the Mimebody part but I am not sure how I would parse through it and pull out the attachment.

final byte[] mailMessageString = resultSet.getBytes(mailMessageIndex);
File file = new File("C:\\Users\\khurt\\Downloads\\op.txt");
List<File> attachments = new ArrayList<File>();
@SuppressWarnings("deprecation")
String mimeType = file.toURL().openConnection().getContentType();
MimeBodyPart att = new MimeBodyPart(); 
ByteArrayDataSource efe = new ByteArrayDataSource(mailMessageString, mimeType); 
DataHandler dh = new DataHandler(efe);
att.setDataHandler(dh);
att.setFileName(bds.getName());
Multipart multipart = (Multipart) att.getContent();
multipart.addBodyPart(att);
for (int i = 0; i < multipart.getCount(); i++) 
{
    BodyPart bodyPart = multipart.getBodyPart(i);
    if(!Part.ATTACHMENT.equalsIgnoreCase(bodyPart.getDisposition())
        && !StringUtils.isNotBlank(bodyPart.getFileName())) 
    {
        InputStream is = bodyPart.getInputStream();
        File f = new File("C:\\Users\\khurt\\Downloads\\"
            + bodyPart.getFileName());
        FileOutputStream fos = new FileOutputStream(f);
        byte[] buf = new byte[4096];
        int bytesRead;
        while ((bytesRead = is.read(buf)) != -1) 
        {
            fos.write(buf, 0, bytesRead);
        }
        fos.close();
        attachments.add(f);
    }
    else
    {
        System.out.println("there is nata");
    }
}

There are no actual errors when it gets to the for - loop but I have not yet parsed the email to get any of the files. Is it possible to parse through a MimeBodyPart?

For Reference the emails will have the data about it then the email attachment starts with an empty line and then: (The email inst java, Stack Overflow wouldn't let me post it without formatting it, though. Also some emails don't have the header with the info about the attachment).

--_002_2733D716DEFD0D49BF462DE618263C07019302260BCVGEXCEMAIL01_
Content-Type: image/gif; name="image001.gif"
Content-Description: image001.gif
Content-Disposition: inline; filename="image001.gif"; size=1669;
    creation-date="Tue, 14 Jun 2011 14:42:12 GMT";
    modification-date="Tue, 14 Jun 2011 14:42:12 GMT"
Content-ID: <image001.gif@01CC2204.E828E6F0>
Content-Transfer-Encoding: base64
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Iterate over the `BodyPart`s of the `MimeMultipart`. Use `MimeMultipart.getCount()` to retrieve the number of parts then `MimeMultipart.getBodyPart(index)` to retrieve the actual part — Bruno Grieder, Jun 27 '14 at 15:05
Your code dosn't seem complete, you load the bytes into mailMessageString then create a ByteArrayDataSource called efe from it but then never use that. Also you use a variable bds but this is not defined or set anywhere. — dethorpe, Jun 27 '14 at 15:44
That was my mistake on puttin the code in, I edited it a few hours ago after I figured out an earlier problem and forgot to change the varaible from bds to efe — user3772418, Jun 27 '14 at 17:38

score 4 · Answer 1 · answered Jun 27 '14 at 19:20

4

Use the MimeMessage constructor that takes an InputStream. Then access the attachments in the message in the normal fashion. See the msgshow.java sample program for example code.

answered Jun 27 '14 at 19:20

Bill Shannon

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1

The problem is that I don't have a mail session, there is no constructor that just takes a InputStream – user3772418 Jun 30 '14 at 13:48
4

Just create a Session to use for this purpose. The Session just holds configuration information. If you don't need to change any defaults it's as easy as Session session = Session.getInstance(new Properties()); – Bill Shannon Jun 30 '14 at 20:56

How to convert byte[] to message with javax.mail library

1 Answers1