The two diffs add the folowing:

<mt:message url="http://www.domain.net"/>

<mt:message url="">
   http://www.domain.net
</mt:message>

And, when attaching a file, each attachment will have a Content-ID based on the
filename.



Index: AttachTag.java
===================================================================
--- AttachTag.java	(revision 1)
+++ AttachTag.java	(working copy)
@@ -97,8 +97,13 @@
         }
         mbp = new MimeBodyPart();  // create the bodypart for this attachment
         body = null;
-        if (type != null || (file != null && file.length() == 0) ||
-                (url != null && url.length() == 0) ) {
+        if (
+            type != null 
+        || 
+            (file != null && file.length() == 0) 
+        ||
+            (url != null && url.length() == 0) 
+        ) {
             return EVAL_BODY_TAG;
         }
         return SKIP_BODY;
@@ -233,10 +238,13 @@
         try {
             URL url = new URL(value);
             mbp.setDataHandler(new DataHandler(url));
-            if(url.getFile() != null)
+            if(url.getFile() != null) {
                 mbp.setFileName(url.getFile());
-            else
+                mbp.setContentID(url.getFile());
+            } else {
                 mbp.setFileName(value);
+                mbp.setContentID(value);
+            }
 
         } catch(MalformedURLException e) {
             throw new JspException("The URL entered as an attachment was " +
@@ -268,6 +276,7 @@
                 DataSource attachment = new FileDataSource(file);
                 mbp.setDataHandler(new DataHandler(attachment));
                 mbp.setFileName(file.getName());
+                mbp.setContentID(file.getName());
             } else {
                 // if the file does not exist it is probably an error in the way
                 // the page author is adding the path throw an exception so this
Index: MessageTag.java
===================================================================
--- MessageTag.java	(revision 1)
+++ MessageTag.java	(working copy)
@@ -19,6 +19,11 @@
 import javax.servlet.jsp.JspException;
 import javax.servlet.jsp.tagext.BodyContent;
 import javax.servlet.jsp.tagext.BodyTagSupport;
+import java.net.URL;
+import javax.mail.internet.MimeBodyPart;
+import javax.activation.DataHandler;
+import java.net.MalformedURLException;
+import javax.mail.MessagingException;
 
 /**
  * MessageTag - JSP tag <b>Message</b> is used to set the message in an e-mail.
@@ -55,11 +60,27 @@
     private String type = "text";
 
     /**
+     * holds the value of body if the url is to be retrieved from the body of
+     * tag
+     */
+    private String url = null;
+    
+    /**
      * character set to be used (default is unspecified)
      */
     private String charset = null;
 
     /**
+     * object in which the attachment is stored within the e-mail message
+     */
+    private MimeBodyPart mbp = null;
+    
+    /**
+     * pointer to the parent tag
+     */
+    private MailTag myparent = null;
+    
+    /**
      *  implementation of the method from the tag interface that tells the JSP
      *  page what to do after the body of this tag
      *
@@ -71,26 +92,81 @@
      *
      */
     public int doAfterBody() throws JspException {
+        BodyContent body = getBodyContent();
+        mbp = new MimeBodyPart();  // create the bodypart for this attachment 
      
+        myparent = (MailTag)findAncestorWithClass(this, MailTag.class);
+        if (url == null) {
+            // parent tag must be a MailTag, gives access to methods in parent
+            if (myparent == null) {
+                throw new JspException("message tag not nested within mail tag");
+            }
+            
+            String message = body.getString();
+            // Clear the body since we only used it as input for the email address
+            body.clearBody();
+            if (message == null) {
+                throw new JspException("The message tag is empty");
+            }
+            myparent.setMessage(message); // set message in the parent tag
+            myparent.setType(type);  // set the mime type of the message
+            myparent.setCharset(charset);  // set the character set of the message
+            
+        } else if (url.length() == 0 && body != null) {
+            String s_body = body.getString();
+            if(s_body != null)
+                s_body = s_body.trim();
+            // the url is supposed to come from the body of the tag
+            if (s_body.length() > 0) {
+                // prepare the file or url resource to be an attachment
+                setUrlBodyPart(s_body);
+            } else {
+                // body is empty throw error
+                throw new JspException(
+                    "The url must be givenin the body of this tag.");
+            }
+        } else
+            // create the attachment with the url in the url attribute
+            setUrlBodyPart(url);
+        return SKIP_BODY;
+    }
 
-	// parent tag must be a MailTag, gives access to methods in parent
-	MailTag myparent = (MailTag)findAncestorWithClass(this, MailTag.class);
-	if (myparent == null) {
-	    throw new JspException("message tag not nested within mail tag");
-        }
+    /**
+     * wrap the url named attachment in the approiate datahandler and create a
+     * mimebodypart to be added to the list of attachments
+     *
+     * @param value  string that represents a URL
+     *
+     */
+    protected void setUrlBodyPart(String value) throws JspException {
 
-        BodyContent body = getBodyContent();
-        String message = body.getString();
-        // Clear the body since we only used it as input for the email address
-        body.clearBody();
-        if (message == null) {
-            throw new JspException("The message tag is empty");
+// Added by Jayson Falkner - 5/8/2001
+
+        try {
+            URL url = new URL(value);
+            mbp.setDataHandler(new DataHandler(url));
+            if(url.getFile() != null) {
+                mbp.setFileName(url.getFile());
+                mbp.setContentID(url.getFile());
+            } else {
+                mbp.setFileName(value);
+                mbp.setContentID(value);
+            }   
+            myparent.setMessage((String)mbp.getContent()); // set message in
the parent tag
+            myparent.setType(type);  // set the mime type of the message
+            myparent.setCharset(charset);  // set the character set of the message
+        } catch(MalformedURLException e) {
+            throw new JspException("The URL entered as an attachment was " +
+                        "incorrectly formatted please check it and try again.");
+        } catch(MessagingException e) {
+            throw new JspException("The Resource named by " + url + " could not"
+                                   + " be used as the message body.");
+        } catch(java.io.IOException ioe) {
+            throw new JspException("The Resource named by " + url + " could not"
+                                   + " be cast to a String.");
         }
-	myparent.setMessage(message); // set message in the parent tag
-	myparent.setType(type);  // set the mime type of the message
-	myparent.setCharset(charset);  // set the character set of the message
-	return SKIP_BODY;
+// End of added
     }
-
+    
     /**
      * set the mime type for this email text or html
      *
@@ -110,4 +186,15 @@
     public void setCharset(String value) {
 	charset = value;
     }
+    
+    /**
+     * set the resource named by URL into a mimebodypart so that it can be added
+     * to the list of attachments for this e-mail
+     *
+     * @param value  full url including http://, to the resource to be added as
+     *               an attachment
+     */
+    public void setUrl(String value) {
+        url = value;
+    }
 }