Package jakarta.mail.internet

Class MimeBodyPart

java.lang.Object
jakarta.mail.BodyPart
jakarta.mail.internet.MimeBodyPart
All Implemented Interfaces:
MimePart, Part
Direct Known Subclasses:
PreencodedMimeBodyPart
public class MimeBodyPart extends BodyPart implements MimePart
This class represents a MIME body part. It implements the BodyPart abstract class and the MimePart interface. MimeBodyParts are contained in MimeMultipart objects.

MimeBodyPart uses the InternetHeaders class to parse and store the headers of that body part.

A note on RFC 822 and MIME headers

RFC 822 header fields must contain only US-ASCII characters. MIME allows non ASCII characters to be present in certain portions of certain headers, by encoding those characters. RFC 2047 specifies the rules for doing this. The MimeUtility class provided in this package can be used to to achieve this. Callers of the setHeader, addHeader, and addHeaderLine methods are responsible for enforcing the MIME requirements for the specified headers. In addition, these header fields must be folded (wrapped) before being sent if they exceed the line length limitation for the transport (1000 bytes for SMTP). Received headers may have been folded. The application is responsible for folding and unfolding headers as appropriate.

See Also:

  • Field Details

    • dh

      protected DataHandler dh
      The DataHandler object representing this Part's content.

    • content

      protected byte[] content
      Byte array that holds the bytes of the content of this Part.

    • contentStream

      protected InputStream contentStream
      If the data for this body part was supplied by an InputStream that implements the SharedInputStream interface, contentStream is another such stream representing the content of this body part. In this case, content will be null.
      Since:
      JavaMail 1.2

    • headers

      protected InternetHeaders headers
      The InternetHeaders object that stores all the headers of this body part.

    • cachedContent

      protected Object cachedContent
      If our content is a Multipart of Message object, we save it the first time it's created by parsing a stream so that changes to the contained objects will not be lost. If this field is not null, it's return by the getContent() method. The getContent() method sets this field if it would return a Multipart or MimeMessage object. This field is is cleared by the setDataHandler(jakarta.activation.DataHandler) method.
      Since:
      JavaMail 1.5

  • Constructor Details

    • MimeBodyPart

      public MimeBodyPart()
      An empty MimeBodyPart object is created. This body part maybe filled in by a client constructing a multipart message.

    • MimeBodyPart

      public MimeBodyPart(InputStream is) throws MessagingException
      Constructs a MimeBodyPart by reading and parsing the data from the specified input stream. The parser consumes data till the end of the given input stream. The input stream must start at the beginning of a valid MIME body part and must terminate at the end of that body part.

      Note that the "boundary" string that delimits body parts must not be included in the input stream. The intention is that the MimeMultipart parser will extract each body part's bytes from a multipart stream and feed them into this constructor, without the delimiter strings.

      Parameters:
      is - the body part Input Stream
      Throws:
      MessagingException - for failures

    • MimeBodyPart

      public MimeBodyPart(InternetHeaders headers, byte[] content) throws MessagingException
      Constructs a MimeBodyPart using the given header and content bytes.

      Used by providers.

      Parameters:
      headers - The header of this part
      content - bytes representing the body of this part.
      Throws:
      MessagingException - for failures

  • Method Details

    • getSize

      public int getSize() throws MessagingException
      Return the size of the content of this body part in bytes. Return -1 if the size cannot be determined.

      Note that this number may not be an exact measure of the content size and may or may not account for any transfer encoding of the content.

      This implementation returns the size of the content array (if not null), or, if contentStream is not null, and the available method returns a positive number, it returns that number as the size. Otherwise, it returns -1.

      Specified by:
      getSize in interface Part
      Returns:
      size in bytes, or -1 if not known
      Throws:
      MessagingException - for failures

    • getLineCount

      public int getLineCount() throws MessagingException
      Return the number of lines for the content of this Part. Return -1 if this number cannot be determined.

      Note that this number may not be an exact measure of the content length and may or may not account for any transfer encoding of the content.

      This implementation returns -1.

      Specified by:
      getLineCount in interface Part
      Returns:
      number of lines, or -1 if not known
      Throws:
      MessagingException - for failures

    • getContentType

      public String getContentType() throws MessagingException
      Returns the value of the RFC 822 "Content-Type" header field. This represents the content type of the content of this body part. This value must not be null. If this field is unavailable, "text/plain" should be returned.

      This implementation uses getHeader(name) to obtain the requisite header field.

      Specified by:
      getContentType in interface Part
      Returns:
      Content-Type of this body part
      Throws:
      MessagingException - for failures
      See Also:

    • isMimeType

      public boolean isMimeType(String mimeType) throws MessagingException
      Is this Part of the specified MIME type? This method compares only the primaryType and subType. The parameters of the content types are ignored.

      For example, this method will return true when comparing a Part of content type "text/plain" with "text/plain; charset=foobar".

      If the subType of mimeType is the special character '*', then the subtype is ignored during the comparison.

      Specified by:
      isMimeType in interface Part
      Parameters:
      mimeType - the MIME type to test
      Returns:
      true if this part is of the specified type
      Throws:
      MessagingException - for failures

    • getDisposition

      public String getDisposition() throws MessagingException
      Returns the disposition from the "Content-Disposition" header field. This represents the disposition of this part. The disposition describes how the part should be presented to the user.

      If the Content-Disposition field is unavailable, null is returned.

      This implementation uses getHeader(name) to obtain the requisite header field.

      Specified by:
      getDisposition in interface Part
      Returns:
      disposition of this part, or null if unknown
      Throws:
      MessagingException - for failures
      See Also:

    • setDisposition

      public void setDisposition(String disposition) throws MessagingException
      Set the disposition in the "Content-Disposition" header field of this body part. If the disposition is null, any existing "Content-Disposition" header field is removed.
      Specified by:
      setDisposition in interface Part
      Parameters:
      disposition - disposition of this part
      Throws:
      IllegalWriteException - if the underlying implementation does not support modification
      IllegalStateException - if this body part is obtained from a READ_ONLY folder.
      MessagingException - for other failures
      See Also:

    • getEncoding

      public String getEncoding() throws MessagingException
      Returns the content transfer encoding from the "Content-Transfer-Encoding" header field. Returns null if the header is unavailable or its value is absent.

      This implementation uses getHeader(name) to obtain the requisite header field.

      Specified by:
      getEncoding in interface MimePart
      Returns:
      content-transfer-encoding
      Throws:
      MessagingException - for failures
      See Also:

    • getContentID

      public String getContentID() throws MessagingException
      Returns the value of the "Content-ID" header field. Returns null if the field is unavailable or its value is absent.

      This implementation uses getHeader(name) to obtain the requisite header field.

      Specified by:
      getContentID in interface MimePart
      Returns:
      content-ID
      Throws:
      MessagingException - for failures

    • setContentID

      public void setContentID(String cid) throws MessagingException
      Set the "Content-ID" header field of this body part. If the cid parameter is null, any existing "Content-ID" is removed.
      Parameters:
      cid - the Content-ID
      Throws:
      IllegalWriteException - if the underlying implementation does not support modification
      IllegalStateException - if this body part is obtained from a READ_ONLY folder.
      MessagingException - for other failures
      Since:
      JavaMail 1.3

    • getContentMD5

      public String getContentMD5() throws MessagingException
      Return the value of the "Content-MD5" header field. Returns null if this field is unavailable or its value is absent.

      This implementation uses getHeader(name) to obtain the requisite header field.

      Specified by:
      getContentMD5 in interface MimePart
      Returns:
      content-MD5
      Throws:
      MessagingException - for failures

    • setContentMD5

      public void setContentMD5(String md5) throws MessagingException
      Set the "Content-MD5" header field of this body part.
      Specified by:
      setContentMD5 in interface MimePart
      Parameters:
      md5 - the MD5 value
      Throws:
      IllegalWriteException - if the underlying implementation does not support modification
      IllegalStateException - if this body part is obtained from a READ_ONLY folder.
      IllegalWriteException - if the underlying implementation does not support modification
      MessagingException

    • getContentLanguage

      public String[] getContentLanguage() throws MessagingException
      Get the languages specified in the Content-Language header of this MimePart. The Content-Language header is defined by RFC 1766. Returns null if this header is not available or its value is absent.

      This implementation uses getHeader(name) to obtain the requisite header field.

      Specified by:
      getContentLanguage in interface MimePart
      Returns:
      array of content language strings
      Throws:
      MessagingException - for failures

    • setContentLanguage

      public void setContentLanguage(String[] languages) throws MessagingException
      Set the Content-Language header of this MimePart. The Content-Language header is defined by RFC 1766.
      Specified by:
      setContentLanguage in interface MimePart
      Parameters:
      languages - array of language tags
      Throws:
      IllegalWriteException - if the underlying implementation does not support modification
      MessagingException

    • getDescription

      public String getDescription() throws MessagingException
      Returns the "Content-Description" header field of this body part. This typically associates some descriptive information with this part. Returns null if this field is unavailable or its value is absent.

      If the Content-Description field is encoded as per RFC 2047, it is decoded and converted into Unicode. If the decoding or conversion fails, the raw data is returned as is.

      This implementation uses getHeader(name) to obtain the requisite header field.

      Specified by:
      getDescription in interface Part
      Returns:
      content description
      Throws:
      MessagingException - for failures

    • setDescription

      public void setDescription(String description) throws MessagingException
      Set the "Content-Description" header field for this body part. If the description parameter is null, then any existing "Content-Description" fields are removed.

      If the description contains non US-ASCII characters, it will be encoded using the platform's default charset. If the description contains only US-ASCII characters, no encoding is done and it is used as is.

      Note that if the charset encoding process fails, a MessagingException is thrown, and an UnsupportedEncodingException is included in the chain of nested exceptions within the MessagingException.

      Specified by:
      setDescription in interface Part
      Parameters:
      description - content description
      Throws:
      IllegalWriteException - if the underlying implementation does not support modification
      IllegalStateException - if this body part is obtained from a READ_ONLY folder.
      MessagingException - otherwise; an UnsupportedEncodingException may be included in the exception chain if the charset conversion fails.

    • setDescription

      public void setDescription(String description, String charset) throws MessagingException
      Set the "Content-Description" header field for this body part. If the description parameter is null, then any existing "Content-Description" fields are removed.

      If the description contains non US-ASCII characters, it will be encoded using the specified charset. If the description contains only US-ASCII characters, no encoding is done and it is used as is.

      Note that if the charset encoding process fails, a MessagingException is thrown, and an UnsupportedEncodingException is included in the chain of nested exceptions within the MessagingException.

      Parameters:
      description - Description
      charset - Charset for encoding
      Throws:
      IllegalWriteException - if the underlying implementation does not support modification
      IllegalStateException - if this body part is obtained from a READ_ONLY folder.
      MessagingException - otherwise; an UnsupportedEncodingException may be included in the exception chain if the charset conversion fails.

    • getFileName

      public String getFileName() throws MessagingException
      Get the filename associated with this body part.

      Returns the value of the "filename" parameter from the "Content-Disposition" header field of this body part. If its not available, returns the value of the "name" parameter from the "Content-Type" header field of this body part. Returns null if both are absent.

      If the mail.mime.decodefilename System property is set to true, the MimeUtility.decodeText method will be used to decode the filename. While such encoding is not supported by the MIME spec, many mailers use this technique to support non-ASCII characters in filenames. The default value of this property is false.

      Specified by:
      getFileName in interface Part
      Returns:
      filename
      Throws:
      MessagingException - for failures

    • setFileName

      public void setFileName(String filename) throws MessagingException
      Set the filename associated with this body part, if possible.

      Sets the "filename" parameter of the "Content-Disposition" header field of this body part. For compatibility with older mailers, the "name" parameter of the "Content-Type" header is also set.

      If the mail.mime.encodefilename System property is set to true, the MimeUtility.encodeText method will be used to encode the filename. While such encoding is not supported by the MIME spec, many mailers use this technique to support non-ASCII characters in filenames. The default value of this property is false.

      Specified by:
      setFileName in interface Part
      Parameters:
      filename - the file name
      Throws:
      IllegalWriteException - if the underlying implementation does not support modification
      IllegalStateException - if this body part is obtained from a READ_ONLY folder.
      MessagingException - for other failures

    • getInputStream

      public InputStream getInputStream() throws IOException, MessagingException
      Return a decoded input stream for this body part's "content".

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

      Specified by:
      getInputStream in interface Part
      Returns:
      an InputStream
      Throws:
      IOException - this is typically thrown by the DataHandler. Refer to the documentation for jakarta.activation.DataHandler for more details.
      MessagingException - for other failures
      See Also:

    • getContentStream

      protected InputStream getContentStream() throws MessagingException
      Produce the raw bytes of the content. This method is used when creating a DataHandler object for the content. Subclasses that can provide a separate input stream for just the Part content might want to override this method.

      Returns:
      an InputStream containing the raw bytes
      Throws:
      MessagingException - for failures
      See Also:

    • getRawInputStream

      public InputStream getRawInputStream() throws MessagingException
      Return an InputStream to the raw data with any Content-Transfer-Encoding intact. This method is useful if the "Content-Transfer-Encoding" header is incorrect or corrupt, which would prevent the getInputStream method or getContent method from returning the correct data. In such a case the application may use this method and attempt to decode the raw data itself.

      This implementation simply calls the getContentStream method.

      Returns:
      an InputStream containing the raw bytes
      Throws:
      MessagingException - for failures
      Since:
      JavaMail 1.2
      See Also:

    • getDataHandler

      public DataHandler getDataHandler() throws MessagingException
      Return a DataHandler for this body part's content.

      The implementation provided here works just like the the implementation in MimeMessage.

      Specified by:
      getDataHandler in interface Part
      Returns:
      DataHandler for the content
      Throws:
      MessagingException - for failures
      See Also:

    • getContent

      public Object getContent() throws IOException, MessagingException
      Return the content as a Java object. The type of the object returned is of course dependent on the content itself. For example, the native format of a text/plain content is usually a String object. The native format for a "multipart" content is always a Multipart subclass. For content types that are unknown to the DataHandler system, an input stream is returned as the content.

      This implementation obtains the content from the DataHandler. That is, it invokes getDataHandler().getContent(); If the content is a Multipart or Message object and was created by parsing a stream, the object is cached and returned in subsequent calls so that modifications to the content will not be lost.

      Specified by:
      getContent in interface Part
      Returns:
      Object
      Throws:
      IOException - this is typically thrown by the DataHandler. Refer to the documentation for jakarta.activation.DataHandler for more details.
      MessagingException - for other failures
      See Also:

    • setDataHandler

      public void setDataHandler(DataHandler dh) throws MessagingException
      This method provides the mechanism to set this body part's content. The given DataHandler object should wrap the actual content.
      Specified by:
      setDataHandler in interface Part
      Parameters:
      dh - The DataHandler for the content
      Throws:
      IllegalWriteException - if the underlying implementation does not support modification
      IllegalStateException - if this body part is obtained from a READ_ONLY folder.
      MessagingException - for other failures

    • setContent

      public void setContent(Object o, String type) throws MessagingException
      A convenience method for setting this body part's content.

      The content is wrapped in a DataHandler object. Note that a DataContentHandler class for the specified type should be available to the Jakarta Mail implementation for this to work right. That is, to do setContent(foobar, "application/x-foobar"), a DataContentHandler for "application/x-foobar" should be installed. Refer to the Java Activation Framework for more information.

      Specified by:
      setContent in interface Part
      Parameters:
      o - the content object
      type - Mime type of the object
      Throws:
      IllegalWriteException - if the underlying implementation does not support modification of existing values
      IllegalStateException - if this body part is obtained from a READ_ONLY folder.
      MessagingException - for other failures

    • setText

      public void setText(String text) throws MessagingException
      Convenience method that sets the given String as this part's content, with a MIME type of "text/plain". If the string contains non US-ASCII characters, it will be encoded using the platform's default charset. The charset is also used to set the "charset" parameter.

      Note that there may be a performance penalty if text is large, since this method may have to scan all the characters to determine what charset to use.

      If the charset is already known, use the setText method that takes the charset parameter.

      Specified by:
      setText in interface MimePart
      Specified by:
      setText in interface Part
      Parameters:
      text - the text content to set
      Throws:
      MessagingException - if an error occurs
      See Also:

    • setText

      public void setText(String text, String charset) throws MessagingException
      Convenience method that sets the given String as this part's content, with a MIME type of "text/plain" and the specified charset. The given Unicode string will be charset-encoded using the specified charset. The charset is also used to set the "charset" parameter.
      Specified by:
      setText in interface MimePart
      Parameters:
      text - the text content to set
      charset - the charset to use for the text
      Throws:
      MessagingException - if an error occurs

    • setText

      public void setText(String text, String charset, String subtype) throws MessagingException
      Convenience method that sets the given String as this part's content, with a primary MIME type of "text" and the specified MIME subtype. The given Unicode string will be charset-encoded using the specified charset. The charset is also used to set the "charset" parameter.
      Specified by:
      setText in interface MimePart
      Parameters:
      text - the text content to set
      charset - the charset to use for the text
      subtype - the MIME subtype to use (e.g., "html")
      Throws:
      MessagingException - if an error occurs
      Since:
      JavaMail 1.4

    • setContent

      public void setContent(Multipart mp) throws MessagingException
      This method sets the body part's content to a Multipart object.
      Specified by:
      setContent in interface Part
      Parameters:
      mp - The multipart object that is the Message's content
      Throws:
      IllegalWriteException - if the underlying implementation does not support modification of existing values.
      IllegalStateException - if this body part is obtained from a READ_ONLY folder.
      MessagingException - for other failures

    • attachFile

      public void attachFile(File file) throws IOException, MessagingException
      Use the specified file to provide the data for this part. The simple file name is used as the file name for this part and the data in the file is used as the data for this part. The encoding will be chosen appropriately for the file data. The disposition of this part is set to Part.ATTACHMENT.
      Parameters:
      file - the File object to attach
      Throws:
      IOException - errors related to accessing the file
      MessagingException - message related errors
      Since:
      JavaMail 1.4

    • attachFile

      public void attachFile(String file) throws IOException, MessagingException
      Use the specified file to provide the data for this part. The simple file name is used as the file name for this part and the data in the file is used as the data for this part. The encoding will be chosen appropriately for the file data.
      Parameters:
      file - the name of the file to attach
      Throws:
      IOException - errors related to accessing the file
      MessagingException - message related errors
      Since:
      JavaMail 1.4

    • attachFile

      public void attachFile(File file, String contentType, String encoding) throws IOException, MessagingException
      Use the specified file with the specified Content-Type and Content-Transfer-Encoding to provide the data for this part. If contentType or encoding are null, appropriate values will be chosen. The simple file name is used as the file name for this part and the data in the file is used as the data for this part. The disposition of this part is set to Part.ATTACHMENT.
      Parameters:
      file - the File object to attach
      contentType - the Content-Type, or null
      encoding - the Content-Transfer-Encoding, or null
      Throws:
      IOException - errors related to accessing the file
      MessagingException - message related errors
      Since:
      JavaMail 1.5

    • attachFile

      public void attachFile(String file, String contentType, String encoding) throws IOException, MessagingException
      Use the specified file with the specified Content-Type and Content-Transfer-Encoding to provide the data for this part. If contentType or encoding are null, appropriate values will be chosen. The simple file name is used as the file name for this part and the data in the file is used as the data for this part. The disposition of this part is set to Part.ATTACHMENT.
      Parameters:
      file - the name of the file
      contentType - the Content-Type, or null
      encoding - the Content-Transfer-Encoding, or null
      Throws:
      IOException - errors related to accessing the file
      MessagingException - message related errors
      Since:
      JavaMail 1.5

    • saveFile

      public void saveFile(File file) throws IOException, MessagingException
      Save the contents of this part in the specified file. The content is decoded and saved, without any of the MIME headers.
      Parameters:
      file - the File object to write to
      Throws:
      IOException - errors related to accessing the file
      MessagingException - message related errors
      Since:
      JavaMail 1.4

    • saveFile

      public void saveFile(String file) throws IOException, MessagingException
      Save the contents of this part in the specified file. The content is decoded and saved, without any of the MIME headers.
      Parameters:
      file - the name of the file to write to
      Throws:
      IOException - errors related to accessing the file
      MessagingException - message related errors
      Since:
      JavaMail 1.4

    • writeTo

      public void writeTo(OutputStream os) throws IOException, MessagingException
      Output the body part as an RFC 822 format stream.
      Specified by:
      writeTo in interface Part
      Parameters:
      os - the stream to write to
      Throws:
      IOException - if an error occurs writing to the stream or if an error is generated by the jakarta.activation layer.
      MessagingException - for other failures
      See Also:

    • getHeader

      public String[] getHeader(String name) throws MessagingException
      Get all the headers for this header_name. Note that certain headers may be encoded as per RFC 2047 if they contain non US-ASCII characters and these should be decoded.
      Specified by:
      getHeader in interface Part
      Parameters:
      name - name of header
      Returns:
      array of headers
      Throws:
      MessagingException - for failures
      See Also:

    • getHeader

      public String getHeader(String name, String delimiter) throws MessagingException
      Get all the headers for this header name, returned as a single String, with headers separated by the delimiter. If the delimiter is null, only the first header is returned.
      Specified by:
      getHeader in interface MimePart
      Parameters:
      name - the name of this header
      delimiter - delimiter between fields in returned string
      Returns:
      the value fields for all headers with this name
      Throws:
      MessagingException - for failures

    • setHeader

      public void setHeader(String name, String value) throws MessagingException
      Set the value for this header_name. Replaces all existing header values with this new value. Note that RFC 822 headers must contain only US-ASCII characters, so a header that contains non US-ASCII characters must be encoded as per the rules of RFC 2047.
      Specified by:
      setHeader in interface Part
      Parameters:
      name - header name
      value - header value
      Throws:
      IllegalWriteException - if the underlying implementation does not support modification of existing values
      MessagingException - for other failures
      See Also:

    • addHeader

      public void addHeader(String name, String value) throws MessagingException
      Add this value to the existing values for this header_name. Note that RFC 822 headers must contain only US-ASCII characters, so a header that contains non US-ASCII characters must be encoded as per the rules of RFC 2047.
      Specified by:
      addHeader in interface Part
      Parameters:
      name - header name
      value - header value
      Throws:
      IllegalWriteException - if the underlying implementation does not support modification of existing values
      MessagingException - for other failures
      See Also:

    • removeHeader

      public void removeHeader(String name) throws MessagingException
      Remove all headers with this name.
      Specified by:
      removeHeader in interface Part
      Parameters:
      name - the name of this header
      Throws:
      IllegalWriteException - if the underlying implementation does not support modification of existing values
      MessagingException - for other failures

    • getAllHeaders

      public Enumeration<Header> getAllHeaders() throws MessagingException
      Return all the headers from this Message as an Enumeration of Header objects.
      Specified by:
      getAllHeaders in interface Part
      Returns:
      enumeration of Header objects
      Throws:
      MessagingException - for failures

    • getMatchingHeaders

      public Enumeration<Header> getMatchingHeaders(String[] names) throws MessagingException
      Return matching headers from this Message as an Enumeration of Header objects.
      Specified by:
      getMatchingHeaders in interface Part
      Parameters:
      names - the headers to match
      Returns:
      enumeration of Header objects
      Throws:
      MessagingException - for failures

    • getNonMatchingHeaders

      public Enumeration<Header> getNonMatchingHeaders(String[] names) throws MessagingException
      Return non-matching headers from this Message as an Enumeration of Header objects.
      Specified by:
      getNonMatchingHeaders in interface Part
      Parameters:
      names - the headers to not match
      Returns:
      enumeration of Header objects
      Throws:
      MessagingException - for failures

    • addHeaderLine

      public void addHeaderLine(String line) throws MessagingException
      Add a header line to this body part
      Specified by:
      addHeaderLine in interface MimePart
      Parameters:
      line - the line to add
      Throws:
      IllegalWriteException - if the underlying implementation does not support modification
      MessagingException - for other failures

    • getAllHeaderLines

      public Enumeration<String> getAllHeaderLines() throws MessagingException
      Get all header lines as an Enumeration of Strings. A Header line is a raw RFC 822 header line, containing both the "name" and "value" field.
      Specified by:
      getAllHeaderLines in interface MimePart
      Returns:
      an Enumeration of Strings
      Throws:
      MessagingException - for failures

    • getMatchingHeaderLines

      public Enumeration<String> getMatchingHeaderLines(String[] names) throws MessagingException
      Get matching header lines as an Enumeration of Strings. A Header line is a raw RFC 822 header line, containing both the "name" and "value" field.
      Specified by:
      getMatchingHeaderLines in interface MimePart
      Parameters:
      names - the headers to return
      Returns:
      an Enumeration of Strings
      Throws:
      MessagingException - for failures

    • getNonMatchingHeaderLines

      public Enumeration<String> getNonMatchingHeaderLines(String[] names) throws MessagingException
      Get non-matching header lines as an Enumeration of Strings. A Header line is a raw RFC 822 header line, containing both the "name" and "value" field.
      Specified by:
      getNonMatchingHeaderLines in interface MimePart
      Parameters:
      names - the headers to not return
      Returns:
      an Enumeration of Strings
      Throws:
      MessagingException - for failures

    • updateHeaders

      protected void updateHeaders() throws MessagingException
      Examine the content of this body part and update the appropriate MIME headers. Typical headers that get set here are Content-Type and Content-Transfer-Encoding. Headers might need to be updated in two cases:
      - A message being crafted by a mail application will certainly need to activate this method at some point to fill up its internal headers.
      - A message read in from a Store will have obtained all its headers from the store, and so doesn't need this. However, if this message is editable and if any edits have been made to either the content or message structure, we might need to resync our headers.
      In both cases this method is typically called by the Message.saveChanges method.

      If the cachedContent field is not null (that is, it references a Multipart or Message object), then that object is used to set a new DataHandler, any stream data used to create this object is discarded, and the cachedContent field is cleared.

      Throws:
      MessagingException - for failures