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## com.sun.mail.dsn
Class MessageHeaders

    java.lang.Object
      javax.mail.Message
          javax.mail.internet.MimeMessage
              com.sun.mail.dsn.MessageHeaders

All Implemented Interfaces:
  MimePart, Part

    public class MessageHeaders

extends MimeMessage

A special MimeMessage object that contains only message headers, no content. Used to represent the MIME type text/rfc822-headers.

Since:
  JavaMail 1.4

Nested Class Summary

Nested classes/interfaces inherited from class javax.mail.internet.MimeMessage
`MimeMessage.RecipientType`

Field Summary

Fields inherited from class javax.mail.internet.MimeMessage
`content, contentStream, dh, flags, headers, modified, saved`

Fields inherited from class javax.mail.Message
`expunged, folder, msgnum, session`

Fields inherited from interface javax.mail.Part
`ATTACHMENT, INLINE`

Constructor Summary
`MessageHeaders()` Construct a MessageHeaders object.
`MessageHeaders(InputStream is)` Constructs a MessageHeaders object from the given InputStream.
`MessageHeaders(InternetHeaders headers)` Constructs a MessageHeaders object using the given InternetHeaders.

Method Summary
`protected InputStream` | `getContentStream()` Produce the raw bytes of the content.
`InputStream` | `getInputStream()` Return a decoded input stream for this Message's "content".
`int` | `getSize()` Return the size of this message.
`void` | `setDataHandler(DataHandler dh)` Can't set any content for a MessageHeaders object.

Methods inherited from class javax.mail.internet.MimeMessage
`addFrom, addHeader, addHeaderLine, addRecipients, addRecipients, createInternetHeaders, createMimeMessage, getAllHeaderLines, getAllHeaders, getAllRecipients, getContent, getContentID, getContentLanguage, getContentMD5, getContentType, getDataHandler, getDescription, getDisposition, getEncoding, getFileName, getFlags, getFrom, getHeader, getHeader, getLineCount, getMatchingHeaderLines, getMatchingHeaders, getMessageID, getNonMatchingHeaderLines, getNonMatchingHeaders, getRawInputStream, getReceivedDate, getRecipients, getReplyTo, getSender, getSentDate, getSubject, isMimeType, isSet, parse, removeHeader, reply, saveChanges, setContent, setContent, setContentID, setContentLanguage, setContentMD5, setDescription, setDescription, setDisposition, setFileName, setFlags, setFrom, setFrom, setHeader, setRecipients, setRecipients, setReplyTo, setSender, setSentDate, setSubject, setSubject, setText, setText, setText, updateHeaders, updateMessageID, writeTo, writeTo`

Methods inherited from class javax.mail.Message
`addRecipient, getFolder, getMessageNumber, isExpunged, match, setExpunged, setFlag, setMessageNumber, setRecipient`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### MessageHeaders

    public MessageHeaders()
                   throws MessagingException

  Construct a MessageHeaders object.

  Throws:
    `MessagingException`

### MessageHeaders

    public MessageHeaders(InputStream is)
                   throws MessagingException

  Constructs a MessageHeaders object from the given InputStream.

  Parameters:
    `is` - InputStream
  Throws:
    `MessagingException`

### MessageHeaders

    public MessageHeaders(InternetHeaders headers)
                   throws MessagingException

  Constructs a MessageHeaders object using the given InternetHeaders.

  Parameters:
    `headers` - InternetHeaders to use
  Throws:
    `MessagingException`

Method Detail

### getSize

    public int getSize()

  Return the size of this message. Always returns zero.

  Specified by:
    `getSize` in interface `Part`
  Overrides:
    `getSize` in class `MimeMessage`
  Returns:
    size of content in bytes

### getInputStream

    public InputStream getInputStream()

  Description copied from class: `MimeMessage`
  Return a decoded input stream for this Message's "content".

  This implementation obtains the input stream from the DataHandler, that is, it invokes `getDataHandler().getInputStream()`.

  Specified by:
    `getInputStream` in interface `Part`
  Overrides:
    `getInputStream` in class `MimeMessage`
  Returns:
    an InputStream
  See Also:
    `MimeMessage.getContentStream()`, `DataHandler.getInputStream()`

### getContentStream

    protected InputStream getContentStream()

  Description copied from class: `MimeMessage`
  Produce the raw bytes of the content. This method is used during parsing, to create a DataHandler object for the content. Subclasses that can provide a separate input stream for just the message content might want to override this method.

  This implementation returns a SharedInputStream, if `contentStream` is not null. Otherwise, it returns a ByteArrayInputStream constructed out of the `content` byte array.

  Overrides:
    `getContentStream` in class `MimeMessage`
  See Also:
    `MimeMessage.content`

### setDataHandler

    public void setDataHandler(DataHandler dh)
                        throws MessagingException

  Can't set any content for a MessageHeaders object.

  Specified by:
    `setDataHandler` in interface `Part`
  Overrides:
    `setDataHandler` in class `MimeMessage`
  Parameters:
    `dh` - The DataHandler for the content.
  Throws:
    `MessagingException` - always

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