When we send streamed files from the backend to the flex frontend, we have at least two ways to 'read' it.
The first common way is to save it using a
FilReference.But this way need a confirmation flex popup, and sometimes the flex application is too goodlooking that you're disgusted when the archaic 'Save As' window is displayed!! Espacially when we don't really need to save the file and only want to have a fast look into the document before may be saving it.
It's why there are a second way to handle this, at least for PDF and XLS documents. (and may be for other file types but you have to google it). The way is to open the streamed document into an other tab using a java servlet, and let the web browser decide wich software would open it.
Here is a code sample for PDF :
public static function exportPdfFromStream(stream:ByteArray,
fileName:String):void {
var
header:URLRequestHeader =
new
URLRequestHeader ("Content-type","application/octet-stream");
var
myRequest:URLRequest =
new
URLRequest (urlApplication+ 'CreatePDF' +
'?name='+fileName+'&method=attachment');
myRequest.requestHeaders.push
(header);
myRequest.method
= URLRequestMethod.POST;
myRequest.data
= stream;
navigateToURL(myRequest,"_blank");
}
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For Csv you just need to change the header content-type :
var header:URLRequestHeader
=
new
URLRequestHeader("Content-type", "application/vnd.ms-excel");
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Here is the way to declare the java servlet :
<servlet>
<servlet-name>createPDF</servlet-name>
<servlet-class>
com.manpower.socle.tools.CreatePDFServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>createPDF</servlet-name>
<url-pattern>/client/createPDF</url-pattern>
</servlet-mapping>
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And this is the servlet :
import
javax.servlet.*;
import
javax.servlet.http.*;
import
java.io.*;
public class CreatePDFServlet extends
HttpServlet {
public void
doPost(HttpServletRequest req,
HttpServletResponse
resp)
throws ServletException, IOException {
doGet(req,
resp);
}
public void
doGet(HttpServletRequest req,
HttpServletResponse
resp)
throws ServletException, IOException
{
int i = 0;
int k = 0;
int
maxLength = req.getContentLength();
byte[]
bytes = new byte[maxLength];
String
method = req.getParameter("method");
String
name = req.getParameter("name");
ServletInputStream
si = req.getInputStream();
while (true)
{
k
= si.read(bytes,i,maxLength);
i
+= k;
if (k <= 0)
break;
}
if (bytes != null)
{
ServletOutputStream
stream =
resp.getOutputStream();
resp.setContentType("application/pdf");
resp.setContentLength(bytes.length);
resp.setHeader("Content-Disposition",method +
";filename=" + name);
stream.write(bytes);
stream.flush();
stream.close();
}
else
{
resp.setContentType("text");
resp.getWriter().write("bytes is null");
}
}
}
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Bon courage my friends!
