How to set MimeBodyPart ContentType to text html

Question

The program below shows an unexpected return value for HTML multipart MIME type  Why does this program print text plain and not text html  public class Main     public static void main String   args  throws javax mail MessagingException  java io IOException       javax mail internet MimeBodyPart mime body part   new javax mail internet MimeBodyPart        mime body part setContent  quot  lt h1 gt foo lt  h1 gt  quot    quot text html quot        System out println mime body part getContentType            I have tried numerous alternative ways including setting a ByteArrayDataSource wrapped in a DataHandler  but to no avail   The same thing happens when I try this with a MimeMessage instead of a MimeBodyPart  To compile and run on Linux  javac -classpath   activation jar mail jar Main java java -classpath   activation jar mail jar Main

User · Answer

There is a method setText   which takes 3 arguments    public void setText String text  String charset  String subtype      throws MessagingException   Parameters   text - the text content to set charset - the charset to use for the text subtype - the MIME subtype to use  e g    html     NOTE  the subtype takes text after   in MIME types so for ex    text html would be html text css would be css and so on

User · Answer

What about using   mime body part setHeader  Content-Type    text html      In the documentation of getContentType it says that the value returned is found using getHeader name   So if you set the header using setHeader I guess everything should be fine

User · Answer

Call MimeMessage saveChanges   on the enclosing message  which will update the headers by cascading down the MIME structure into a call to MimeBodyPart updateHeaders   on your body part   It s this updateHeaders call that transfers the content type from the DataHandler to the part s MIME Content-Type header   When you set the content of a MimeBodyPart  JavaMail internally  and not obviously  creates a DataHandler object wrapping the object you passed in   The part s Content-Type header is not updated immediately   There s no straightforward way to do it in your test program  since you don t have a containing MimeMessage and MimeBodyPart updateHeaders   isn t public     Here s a working example that illuminates expected and unexpected outputs   public class MailTest      public static void main  String   args   throws Exception       Session mailSession   Session getInstance  new Properties          Transport transport   mailSession getTransport         String text    Hello  World       String html     lt h1 gt     text     lt  h1 gt         MimeMessage message   new MimeMessage  mailSession        Multipart multipart   new MimeMultipart   alternative          MimeBodyPart textPart   new MimeBodyPart        textPart setText  text   utf-8          MimeBodyPart htmlPart   new MimeBodyPart        htmlPart setContent  html   text html  charset utf-8          multipart addBodyPart  textPart        multipart addBodyPart  htmlPart        message setContent  multipart            Unexpected output      System out println   HTML   text html       htmlPart isMimeType   text html           System out println   HTML Content Type      htmlPart getContentType              Required magic  violates principle of least astonishment       message saveChanges            Output now correct          System out println   TEXT   text plain      textPart isMimeType   text plain           System out println   HTML   text html       htmlPart isMimeType   text html           System out println   HTML Content Type      htmlPart getContentType          System out println   HTML Data Handler      htmlPart getDataHandler   getContentType

User · Answer

Using   lt h1 gt STRING lt h1 gt   getBytes    you can create a ByteArrayDataSource with content-type and set setDataHandler in your MimeBodyPart  try   String html  Test JavaMail API example   lt br gt  lt br gt  Regards   lt br gt Ivonei Jr  byte   bytes   html getBytes     DataSource dataSourceHtml  new ByteArrayDataSource bytes   text html    MimeBodyPart bodyPart   new MimeBodyPart    bodyPart setDataHandler new DataHandler dataSourceHtml     MimeMultipart mimeMultipart   new MimeMultipart    mimeMultipart addBodyPart bodyPart

User · Answer

Try with this    msg setContent email getBody     text html  charset ISO-8859-1

User · Answer

Don t know why  the method is not documented   but by looking at the source code  this line should do it    mime body part setHeader  Content-Type    text html

User · Answer

For me  I set two times    MimeBodyPart messageBodyPart setContent content  text html   Multipart multipart addBodyPart messageBodyPart   MimeMessage msg setContent multipart  text html    and its been working fine

User · Answer

I have used below code in my SpringBoot application   MimeMessage message   sender createMimeMessage    message setContent message   text html    MimeMessageHelper helper   new MimeMessageHelper message    helper setFrom fromAddress   helper setTo toAddress   helper setSubject mailSubject   helper setText mailText  true    sender send message

[java] How to set MimeBodyPart ContentType to "text/html"?

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