To attach and send an existing file:

1. Generate the javax.activation.FileDataSource object.
   In the argument, specify the file path of attachment to be sent and generate the javax.activation.FileDataSource object.
   

   javax.activation.FileDataSource fdSource = new javax.activation.FileDataSource("/tmp/sample.jpg");

2. Generate the javax.activation.DataHandler object.
   Specify the javax.activation.FileDataSource object in the argument and generate javax.activation.DataHandler object.
   

   javax.activation.DataHandler dhandler = new javax.activation.DataHandler(fdSource);

To send a Java object as an attachment:

1. Generate the Java object.
   Here, you generate the java.awt.Image object to be sent as an attachment:
   

   java.awt.Image attachments = Toolkit.getDefaultToolkit().createImage("sample.jpg");

2. Generate the javax.activation.DataHandler object.
   Specify the Java object and MIME type corresponding to the Java object in the argument and generate javax.activation.DataHandler object.
   

   javax.activation.DataHandler dhandler = new javax.activation.DataHandler(attachments, "image/jpeg");

To send the java.lang.String object as an attachment:

1. Generate the java.lang.String object.
   Generate the java.lang.String object of the string to be sent as an attachment.
   

   java.lang.String attachments = new java.lang.String("abcde");

2. Generate the javax.activation.DataHandler object.
   Specify the java.lang.String object and MIME type in the argument and generate the javax.activation.DataHandler object. The java.lang.String object is encoded using the character code specified in charset parameter.
   

   javax.activation.DataHandler dhandler = new javax.activation.DataHandler(attachments, "text/plain; charset=UTF-8");

If the object that you want to send as an attachment in the wsi:swaRef format is a text file, an XML file, or a java.lang.String object (string), you can specify the character code of the string included in the object by using the DataHandler (Object, String) constructor of the javax.activation.DataHandler class.

If you do not specify the character code when creating the javax.activation.DataHandler object, the object to be sent is encoded by the default character code (US-ASCII). If the object contains characters other than the default character code (US-ASCII), the attachment that is sent is treated as invalid. Therefore, specify an appropriate character code especially when you want to include Japanese characters.

If the object to be sent is an XML file, the character code specified in the XML declaration is not used. The XML file is encoded using the default character code (US-ASCII), or the character code specified when creating the javax.activation.DataHandler object, and then sent.

To specify a character code, assign the charset parameter to the MIME type of the object to be specified in the second argument of the DataHandler(Object, String) constructor. The following is the coding format of the second argument of the DataHandler(Object, String) constructor.

Mime type of the object to be sent+";"+"charset"+"="+character code#

#

The character code is not case sensitive. Also, you cannot specify the character code that is not supported by the JDK and a blank character.