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?
>
>

_______________________________________________
This is the Java Programming on and around the iSeries / AS400 (JAVA400-L)
mailing list
To post a message email: JAVA400-L@midrange.com
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/cgi-bin/listinfo/java400-l
or email: JAVA400-L-request@midrange.com
Before posting, please take a moment to review the archives
at http://archive.midrange.com/java400-l.