Yes, I have a similar convenience method on my page backing beans.
It's not portlet-safe, though.
protected void exportFileAction(String contentType, byte[] data,
String filename) throws IOException
{
FacesContext facesContext = FacesContext.getCurrentInstance();
OutputStream responseStream =
((HttpServletResponse)facesContext.getExternalContext().getResponse()).getOutputStream();
if (null == responseStream) throw new
AbortProcessingException("responseStream is null");
HttpServletResponse response =
(HttpServletResponse)facesContext.getExternalContext().getResponse();
response.setContentType(contentType);
response.setHeader("Content-Disposition","attachment;filename=\""
+ filename + "\"");
response.setContentLength(data.length);
responseStream.write(data);
response.flushBuffer();
facesContext.responseComplete();
}
On 2/7/07, Mark Millman <[EMAIL PROTECTED]> wrote:
Thanks, I've wanted to do this for some time and I appreciate the Wiki
reference. I wrote some simple wrapper methods to assist and perhaps they'll
help others.
I tried using HSSFWorkbook.getBytes[] and writing a sendByteArray(byte[],
String) method but Excel had problems consuming the response. So I used
HSSFWorkbook.write(ByteArrayOutputStream) and then converted the
ByteArrayOutputStream back to a byte array and it worked fine.
/**
* this just shows my calling context
*/
public void createSpreadSheet(ActionEvent ae) {
if (list != null && list.size() > 0) {
try {
HSSFWorkbook wb = createHSSFWorkbook(list, title);
String fileName =
FileUtils.getTimestampedFileName(Session.getCurrentInstance().getUserName(),
"xls");
ByteArrayOutputStream bos = new ByteArrayOutputStream();
wb.write(bos);
bos.close();
ServletUtils.sendOutputStream(bos, fileName);
_Logger.log(Level.INFO,"Writing "+fileName+" to
response.outputStream");
} catch (Exception e) {
_Logger.log(Level.WARNING, e.getLocalizedMessage());
}
}
}
--------------- UTILITY METHODS ------------------
/**
* Gets the current ServletContext from the FacesContext in a null safe
manner.
* @return the current ServletContext
*/
public static ServletContext getServletContext() {
ServletContext sc = null;
FacesContext fc = FacesContext.getCurrentInstance();
if (fc != null) {
ExternalContext ec = fc.getExternalContext();
if (ec != null) {
sc = (ServletContext)ec.getContext();
}
}
return sc;
}
/**
* Just a wrapper for [EMAIL PROTECTED] ServletContext#getMimeType(String)
ServletContext.getMimeType()}
* @param fileName
* @return the mime type
* @see ServletContext#getMimeType(String)
*/
public static String getMimeType(String fileName) {
String mimeType = null;
ServletContext context = ServletUtils.getServletContext();
if (context != null) {
mimeType = context.getMimeType(fileName);
}
return mimeType;
}
/**
* Sends the OutputStream contents to the client using
<code>fileName</code> to determine the mime type.
* @param baos an OutputStream that is castable to a ByteArrayOutputStream
* @param fileName a file name to include in the response header
* @throws IOException
* @see #getMimeType(String)
* @see #sendFile(String)
*/
public static void sendOutputStream(OutputStream baos, String fileName)
throws IOException {
FacesContext context = FacesContext.getCurrentInstance();
if (context != null) {
HttpServletResponse response =
(HttpServletResponse)context.getExternalContext().getResponse();
if (response != null) {
String contentType = ServletUtils.getMimeType(fileName);
response.setContentType(contentType);
response.setHeader("Content-Disposition", "attachment;filename=\"" +
fileName + "\"");
OutputStream os = response.getOutputStream();
byte[] bytes = ((ByteArrayOutputStream)baos).toByteArray();
if (os != null) {
os.write(bytes);
os.flush();
os.close();
}
}
FacesContext.getCurrentInstance().responseComplete();
}
}
/**
* Sends the contents of <code>filePath</code> to the client using
<code>filePath</code> to determine the mime type.
* @param filePath an absolute path to a file
* @throws IOException
* @see #sendOutputStream(OutputStream, String)
*/
public static void sendFile(String filePath) throws IOException {
String folder = FileUtils.getParentFolder(filePath);
String fileName = FileUtils.getName(filePath);
FacesContext context = FacesContext.getCurrentInstance();
if (context != null) {
HttpServletResponse response =
(HttpServletResponse)context.getExternalContext().getResponse();
if (response != null) {
String contentType = ServletUtils.getMimeType(fileName);
response.setContentType(contentType);
response.setHeader("Content-Disposition", "attachment;filename=\"" +
fileName + "\"");
FileInputStream fis = null;
OutputStream os = null;
fis = new FileInputStream(new File(folder, fileName));
if (fis != null) {
os = response.getOutputStream();
if (os != null) {
int read = 0;
byte[] bytes = new byte[1024];
while ((read = fis.read(bytes)) != -1) {
os.write(bytes, 0, read);
}
os.flush();
os.close();
}
}
FacesContext.getCurrentInstance().responseComplete();
}
}
}
-----Original Message-----
From: Mike Kienenberger [mailto:[EMAIL PROTECTED]
Sent: Tuesday, February 06, 2007 4:19 PM
To: MyFaces Discussion
Subject: Re: return pdf from database blob?
http://wiki.apache.org/myfaces/Sending_Files
On 2/6/07, Mick Knutson <[EMAIL PROTECTED]> wrote:
> I want to have a table of pdf documents in my database that I want to
> return to my web users. Is there an example of having a MyFaces jsp
> return pdf document verse html?
>
> --
> ---
> Thanks,
> Mick Knutson
>
> http://www.baselogic.com
> http://www.blincmagazine.com
> http://www.djmick.com
> http://www.myspace.com/djmick_dot_com
> http://www.thumpradio.com
> ---
