Solved

When can I delete the physical file when using javax.mail MimeBodyPart

Posted on 2004-08-25
18
504 Views
Last Modified: 2008-01-16
Hi!
I'm using the MimeBodyPart to add files as attachments.
The point is that I want to delete the files before sending the message.
Can you let me know if and when I can delete it?
The code that I'm talking about (from the javax.mail example) is:

Multipart multipart = new MimeMultipart();
multipart.addBodyPart(messageBodyPart);

// Part two is attachment
messageBodyPart = new MimeBodyPart();
DataSource source = new FileDataSource(filename);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(filename);
multipart.addBodyPart(messageBodyPart);

Thanks!
0
Comment
Question by:rzvika2
  • 7
  • 6
  • 5
18 Comments
 
LVL 92

Expert Comment

by:objects
Comment Utility
after you have sent it I'd say.
0
 

Author Comment

by:rzvika2
Comment Utility
No, I need a way to delete it before sending.
0
 
LVL 92

Expert Comment

by:objects
Comment Utility
Then read it into memory, and use a memory based DataSource.
0
 

Author Comment

by:rzvika2
Comment Utility
Can you give me an example please?
0
 
LVL 92

Expert Comment

by:objects
Comment Utility
0
 
LVL 35

Expert Comment

by:TimYates
Comment Utility
there's an example of ByteArrayDataSource in the examples that come with javamail...
0
 

Author Comment

by:rzvika2
Comment Utility
Thanks, I have another related issue,
I need to convert my Multipart to a byte array and the easiest thing is using serialization.
I can't do it because the Multipart is not serializable.
What is your best solution?
Thanks!
0
 
LVL 92

Accepted Solution

by:
objects earned 90 total points
Comment Utility
ByteArrayOutputStream out = new ByteArrayOutputStream();
part.writeTo(out);
out.close();
byte[] bytes = out.toByteArray();
0
 

Author Comment

by:rzvika2
Comment Utility
I have class A that has String, and I have class B that extends A and has Integer and Multipart.
I need 2 methods in class B, one to load the object according to byte[] and one to save to byte[].
The easiest way was to do:
on save:
          ByteArrayOutputStream bos = new ByteArrayOutputStream();
      ObjectOutputStream out = new ObjectOutputStream(bos);
      out.writeObject(this);
      out.close();
      return bos.toByteArray();

on load:
      ByteArrayInputStream bis = new ByteArrayInputStream(byteArray);
      ObjectInputStream in = new ObjectInputStream(bis);

Can you please answer again to my last question
(sorry for the bothering... :-) )
0
Enabling OSINT in Activity Based Intelligence

Activity based intelligence (ABI) requires access to all available sources of data. Recorded Future allows analysts to observe structured data on the open, deep, and dark web.

 
LVL 35

Expert Comment

by:TimYates
Comment Utility
3 questions in one? ;-)

What's the question for the last part?

Why are you trying to serialize the Multipart?
0
 

Author Comment

by:rzvika2
Comment Utility
Yes, one thing leads to another ;-) (but I raise the points each time...)
The actual question deals with saving and loading an object to byte[], where not all the objects that it contains, are serialized.
0
 
LVL 92

Expert Comment

by:objects
Comment Utility
use the code i posted above to serialize your multipart.
0
 
LVL 35

Expert Comment

by:TimYates
Comment Utility
I don't think you can...  That's the point of the Serializable interface, it stops you serializing things that cannot be serialized...

So, you can save the data by using writeTo() as objects showed you, but not load it back in...

Again, why are you serializing the Multipart object?  Why not send the data needed to create it, to the place where it is to be used instead?
0
 

Author Comment

by:rzvika2
Comment Utility
I must save and load object B to byte array (this is not an option).
I save it because I'm not sending it immediately and I don't want to use the files.
0
 
LVL 92

Expert Comment

by:objects
Comment Utility
Why don't you save the message details *before* you create your Multipart.
ie. save what you need to create the multipart.

0
 
LVL 35

Expert Comment

by:TimYates
Comment Utility
I don't believe this can be done...  I *think* that you will have to create it when you want to send (as it is not serializable)

I may be wrong though...

Hopefully objects can show you how :-)
0
 

Author Comment

by:rzvika2
Comment Utility
Someone packs for me this multipart according to a user selection (of files).
I have to save it for a later usage.
I think the most convenient way is to work with serialized object.
Can't I just derive from MimeBodyPart and Multipart and implement them as serializable?
0
 
LVL 35

Assisted Solution

by:TimYates
TimYates earned 35 total points
Comment Utility
> Can't I just derive from MimeBodyPart and Multipart and implement them as serializable?

I think you will hit a stumbling block somewhere down the line :-/  If not in MimeBodyPart, then maybe DataHandler, CommandInfo, CommandMap, or any of the may other classes tied in indirectly with those two classes...

It might work though...  But experience tells me it's probably a long and winding dead end... :-(
0

Featured Post

Threat Intelligence Starter Resources

Integrating threat intelligence can be challenging, and not all companies are ready. These resources can help you build awareness and prepare for defense.

Join & Write a Comment

Suggested Solutions

Introduction This article is the second of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers the basic installation and configuration of the test automation tools used by…
Java functions are among the best things for programmers to work with as Java sites can be very easy to read and prepare. Java especially simplifies many processes in the coding industry as it helps integrate many forms of technology and different d…
Viewers learn about the “while” loop and how to utilize it correctly in Java. Additionally, viewers begin exploring how to include conditional statements within a while loop and avoid an endless loop. Define While Loop: Basic Example: Explanatio…
This theoretical tutorial explains exceptions, reasons for exceptions, different categories of exception and exception hierarchy.

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now