HTTP response header content disposition for attachments

Question

Background  Write an XML document to a browser s response stream and cause the browser to display a  Save As  dialog   Problem  Consider the following download   method     HttpServletResponse response   getResponse       BufferedWriter bw   new BufferedWriter  new OutputStreamWriter        response getOutputStream           String filename    domain xml     String mimeType   new MimetypesFileTypeMap   getContentType  filename          Prints  application octet-stream    System out println   mimeType      mimeType          response setContentType   text xml charset UTF-8       response setContentType  mimeType      response setHeader   Content-Disposition    attachment filename           filename       bw write  getDomainDocument        bw flush      bw close      In Firefox  the XML content is displayed in the browser window  In IE 7  the XML content is not displayed -- you have to view the document source  Neither situation is the desired result   The web page uses the following code for the button        lt a4j commandButton action    domainContent download   value  Create Domain  reRender  error    gt    The XML that is generated does not start with  lt  xml version  1 0   gt   rather the XML content resembles    lt schema xmlns  http   www jaspersoft com 2007 SL XMLSchema  version  1 0  gt     lt items gt       lt item description  EDT Class Code  descriptionId    label  EDT Class Code  labelId    resourceId  as pay payrolldeduction edtclass   gt     lt  items gt     lt resources gt       lt jdbcTable datasourceId  JNDI  id  as pay payrolldeduction  tableName  as pay payrolldeduction  gt         lt fieldList gt           lt field id  payamount  type  java math BigDecimal   gt         lt  fieldList gt       lt  jdbcTable gt     lt  resources gt   lt  schema gt    Update  1  Note the following line of code   response setHeader   Content-Disposition    attachment filename     filename      Update  2  Using  lt a4j commandButton       gt  is the problem  a regular  lt h commandButton      gt  performs as expected  Using the  lt h commandBUtton      gt  prevents the  lt a4j outputPanel      gt  from refreshing any error messages   Related Seam Message   Mime Type  The following mime types do not trigger the  Save As  dialog     application octet-stream   text xml   text plain    Question  What changes will cause the a4j commandButton to trigger a  Save As  dialog box so that the user is prompted to save the XML file  as domain xml    Thank you

User · Answer

neither use inline  nor attachment  just use  response setContentType  text xml    response setHeader   Content-Disposition    filename     filename      or  response setHeader   Content-Disposition    filename       filename             or  response setHeader   Content-Disposition    filename          filename substring 0  filename lastIndexOf

User · Answer

This has nothing to do with the MIME type  but the Content-Disposition header  which should be something like   Content-Disposition  attachment  filename genome jpeg    Make sure it is actually correctly passed to the client  not filtered by the server  proxy or something   Also you could try to change the order of writing headers and set them before getting output stream

User · Answer

Try changing your Content Type  media type  to application x-download and your Content-Disposition to  attachment filename     fileName   response setContentType  application x-download    response setHeader  Content-disposition    attachment  filename     fileName

User · Answer

Problems  The code has the following issues    An Ajax call   lt a4j commandButton      gt   does not work with attachments  Creating the output content must happen first  Displaying the error messages also cannot use Ajax-based a4j tags    Solution   Change  lt a4j commandButton      gt  to  lt h commandButton      gt   Update the source code    Change bw write  getDomainDocument      to bw write  document     Add String document   getDomainDocument    to the first line of the try catch   Change the  lt a4j outputPanel     gt   not shown  to  lt h messages showDetail  false   gt     Essentially  remove all the Ajax facilities related to the commandButton  It is still possible to display error messages and leverage the RichFaces UI style   References   Using a commandButton in a jsf Page to download a file http   www coderanch com t 483892 JSF java when-commandButton-commandLink http   seamframework org 135584 lace

User · Answer

Try the Content-Disposition header  Content-Disposition  attachment  filename  lt file name ext gt

[java] HTTP response header content disposition for attachments

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