Re: JavaMail: Implement DataSource in javax.activation package -- JAVA400-L

The attachment is generated on the fly, there is no file. I can't use
FileDataSource.
Bruce
----- Original Message -----
From: "Geert Van Landeghem" <gvl@reynderseti.be>
To: <java400-l@midrange.com>
Sent: Wednesday, October 10, 2001 3:23 AM
Subject: RE: JavaMail: Implement DataSource in javax.activation package


> Can't you use the FileDataSource class to use files as data source?
> As in the example below:
>
>       MimeBodyPart mbp3 = new MimeBodyPart();
>       DataSource source3 = new FileDataSource("C:\\reynders.gif");
>       mbp3.setHeader("Content-ID", "test");
>       mbp3.setDataHandler(new DataHandler(source3));
>
> -----Original Message-----
> From: Bruce Jin [mailto:brucej@mrc-productivity.com]
> Sent: dinsdag 9 oktober 2001 19:15
> To: java400-l@midrange.com
> Subject: Re: JavaMail: Implement DataSource in javax.activation package
>
>
> This is a multi-part message in MIME format.
> --
> In JavaMail download demo folder I found a  ByteArrayDataSource that
> implements DataSource of javax.activation.  It works. It allows java
program
> to send simple dynamic contents as e-mail attachment. I attached this
> implementation for those interested.
> Bruce
>
> ----- Original Message -----
> From: "Clapham, Paul" <pclapham@core-mark.com>
> To: <java400-l@midrange.com>
> Sent: Friday, October 05, 2001 3:19 PM
> Subject: RE: JavaMail: Implement DataSource in javax.activation package
>
>
> > Don't know, I haven't done this myself.  Your getContentType() looks OK
to
> > me.  I'd have getOutputStream() throw new IOException(), but I doubt
it's
> > even being called.  Can you make your code work with a FileDataSource?
If
> > so, try creating a subclass of FileDataSource and overriding just
> > getContentType() with your code.  That would test that potential
problem.
> > Otherwise, I dunno.
> >
> > PC2
> >
> > -----Original Message-----
> > From: Bruce Jin [mailto:brucej@MRC-PRODUCTIVITY.COM]
> > Sent: October 5, 2001 15:03
> > To: java400-l@midrange.com
> > Subject: Re: JavaMail: Implement DataSource in javax.activation package
> >
> >
> >  Thanks PC2;
> > I wrote a class to implement DataSOurce. Now my JavaMail program runs
with
> > this InputStreamDataSource. But the attached document is always empty. I
> > think I might not have implemented getContentType() and
getOutputStream()
> > correctly. Here is the implementation class:
> >
> > import javax.activation.*;
> > import java.io.*;
> >
> >  public class InputStreamDataSource implements DataSource {
> >   private InputStream inputStream;
> >   private OutputStream outputStream;
> >
> > public InputStreamDataSource(InputStream inputStream) {
> >     this.inputStream = inputStream
> > }
> > public InputStream getInputStream() {
> >     return inputStream
> > }
> >  public String getContentType() {
> >     return "text/plain";                                    //??
> > }
> > public String getName() {
> >     return "aname";
> > }
> > public OutputStream getOutputStream() { //?
> >     return outputStream;
> > }
> > }
> >
> > In my java mail class I have the following:
> >
> >   String aString = "a test string is here";    / / send this as attached
> doc
> >   byte[] bt = aString.getBytes();
> >   InputStream is =  new ByteArrayInputStream(bt);
> >  DataSource source = new InputStreamDataSource(is);
> >
> >  ----- Original Message -----
> >
> > From: "Clapham, Paul" <pclapham@core-mark.com>
> > To: <java400-l@midrange.com>
> > Sent: Friday, October 05, 2001 10:58 AM
> > Subject: RE: JavaMail: Implement DataSource in javax.activation package
> >
> >
> > > You have only four methods to implement, like this:
> > >
> > > getContentType(): return a string containing the MIME type of
whatever's
> > in
> > > the input stream.  You'd have to have some way of setting or
determining
> > > this.
> > >
> > > getInputStream(): return the input stream that you passed into the
> object
> > > via its constructor.
> > >
> > > getName(): probably irrelevant.
> > >
> > > getOutputStream(): throw an IOException.
> > >
> > > PC2
> > >
> > > -----Original Message-----
> > > From: Bruce Jin [mailto:brucej@mrc-productivity.com]
> > > Sent: October 5, 2001 12:38
> > > To: java400-l@midrange.com
> > > Subject: JavaMail: Implement DataSource in javax.activation package
> > >
> > >
> > > In my java program I need to send some generated contents as e-mail
> > > attachment. But I found that the javax.activation only comes with a
> > > FileDataSource that implements DataSource. This can be used to send a
> > file:
> > >
> > > DataSource source = new FileDataSource(filename);
> > >
> > >  How do I implement DataSource so that I have something like
> > > InputStreamDataSource then  I can send some generated contents in my
> java
> > > program as e-mail attachment?
> > >
> > >
> >
> > _______________________________________________
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> --
> [ ByteArrayDataSource.java of type application/octet-stream deleted ]
> --
>
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