Hi,
I've started using Wicket for a new project and am very pleased with the
framework. Congratulations to the developers for eliminating the XML bingo
that some other frameworks impose.
I need to stream a file back to the client browser and I tried to adapt some
old Tapestry/servlet code which provided the same functionality. Using Wicket,
I was able to successfully send the file but I have run into the following two
issues:
1. I can't seem to set the Content-disposition for the returned file so that
the name of the file can be specified to the browser.
2. I see a Jetty server stack trace on every file upload which seems related to
the closing of the response file descriptor.
Is there a different code pattern I should be using?
I am using the following code pattern on a Wicket page. The user has indicated
the desired file and this code gets executed from the link's onClick() handler:
public void uploadFile(DownloadDocument document) {
Response resp = getResponse();
resp.setContentType(document.getMimeType());
resp.setContentLength(new Long(document.getSize()).intValue());
OutputStream out = resp.getOutputStream();
byte[] data = new byte[8096];
InputStream in = document.getInputstream();
/* How do I do this in wicket ?
resp.setHeader("Content-disposition",
"attachment; filename=" +
document.getFileName());
*/
int count = 0;
while ((count = in.read(data)) > -1)
{
out.write(data, 0, count);
}
in.close();
out.close();
}
Here is the entire stack trace I see on every file upload. Server performance
and application availability semm to be unaffected.
10:16:02.655 WARN!! Exception for
/download/download?secure=tShMZd%2FHxwObG2%2BMcwiQhZ4cGCFO5aoJy2WyvT6tRcKVYd9PXUVYWf7f4INUmTDiyo1OyY4gBQs9LTfvi7%2BpYQ%3D%3D
java.lang.IllegalStateException: Commited
at org.mortbay.http.HttpResponse.sendRedirect(HttpResponse.java:448)
at
org.mortbay.jetty.servlet.ServletHttpResponse.sendRedirect(ServletHttpResponse.java:432)
at wicket.protocol.http.WebResponse.redirect(WebResponse.java:156)
at
wicket.protocol.http.WebRequestCycle.redirectTo(WebRequestCycle.java:200)
at
wicket.RequestCycle.redirectToExceptionErrorPage(RequestCycle.java:631)
at wicket.RequestCycle.onRuntimeException(RequestCycle.java:592)
at wicket.RequestCycle.respond(RequestCycle.java:671)
at wicket.RequestCycle.request(RequestCycle.java:376)
at wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:221)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:358)
at
org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:294)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1807)
at
org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:525)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1757)
at org.mortbay.http.HttpServer.service(HttpServer.java:879)
at org.mortbay.http.HttpConnection.service(HttpConnection.java:790)
at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:961)
at org.mortbay.http.HttpConnection.handle(HttpConnection.java:807)
at
org.mortbay.http.SocketListener.handleConnection(SocketListener.java:218)
at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:300)
at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:511)
Thanks for any help,
--Johann
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