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POHTTP response header content disposition for attachments
 

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    <h2>Background</h2> <p>Write an XML document to a browser's response stream and cause the browser to display a "Save As" dialog.</p> <h2>Problem</h2> <p>Consider the following <code>download()</code> method:</p> <pre><code> 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(); </code></pre> <p>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.</p> <p>The web page uses the following code for the button:</p> <pre><code> &lt;a4j:commandButton action="#{domainContent.download}" value="Create Domain" reRender="error" /&gt; </code></pre> <p>The XML that is generated <em>does not</em> start with <code>&lt;?xml version="1.0"?&gt;</code>, rather the XML content resembles:</p> <pre><code>&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; </code></pre> <h2>Update #1</h2> <p>Note the following line of code:</p> <pre><code>response.setHeader( "Content-Disposition", "attachment;filename=" + filename ); </code></pre> <h2>Update #2</h2> <p>Using <code>&lt;a4j:commandButton ... /&gt;</code> is the problem; a regular <code>&lt;h:commandButton .../&gt;</code> performs as expected. Using the <code>&lt;h:commandBUtton .../&gt;</code> prevents the <code>&lt;a4j:outputPanel .../&gt;</code> from refreshing any error messages.</p> <p>Related <a href="http://seamframework.org/135584.lace" rel="noreferrer">Seam Message</a>.</p> <h2>Mime Type</h2> <p>The following mime types do not trigger the "Save As" dialog:</p> <ul> <li><code>"application/octet-stream"</code></li> <li><code>"text/xml"</code></li> <li><code>"text/plain"</code></li> </ul> <h2>Question</h2> <p>What changes will cause the <code>a4j:commandButton</code> to trigger a "Save As" dialog box so that the user is prompted to save the XML file (as <code>domain.xml</code>)?</p> <p>Thank you.</p>
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