Error 500: OutPutStream already obtained

[loffemoffe]

I'm running IBM WebSphere and got a problem with filetransfer.
I've got a txt-file with some data in it, but when I open the file
after downloading it the following message gets added in the end of the
text Error 500: OutPutStream already obtained.

What's the problem? Can someone please help me?!

This is my filedownload.jsp:

<jsp:useBean class="com.peregrine.oaa.archway.User" scope="session"
id="user"></jsp:useBean>
<%
.....
sAttachment = "attachment; filename=\""+ sFileNameAtt +"\"";
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", sAttachment);

InputStream is = null;
OutputStream out2 = null;
try
{
out2 = response.getOutputStream();
is = new FileInputStream(request.getRealPath("files/" + sDirectory +
sFileName));
int i;
while ((i=is.read()) != -1)
{
out2.write(i);
}
}

finally
{
if(out2 != null)
{
out2.flush();
out2.close();
}
if (is != null)
{
is.close();
}
}

%>

 

[SMC]

I'm running IBM WebSphere and got a problem with filetransfer. I've got
a txt-file with some data in it, but when I open the file after
downloading it the following message gets added in the end of the text
Error 500: OutPutStream already obtained.

What's the problem? Can someone please help me?!

The thing with JSP is that is translated into servlet code with all the
literal output (carriage returns, spaces and all) turned into
out.println() code.

Once anything has been committed to the "out" (response objects)
OutputStream, you won't be able to "get" it like you have below.

It can be a tricky exercise to get around this. I'll post a short example
at the bottom.

sAttachment = "attachment; filename=\""+ sFileNameAtt +"\"";
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", sAttachment);

InputStream is = null;
OutputStream out2 = null;
try
{
out2 = response.getOutputStream();

This fails if the OutputStream has already been "gotten". Like I mentioned
above.

We had to do the following sort of munging to ensure no leading whitespace
for one of our pages. Here's an example of what we did merged with some of
your code:

<%@ page import="java.io.*"
%><%@ page import="java.util.*"
%><%@ page import="java.text.*"
%><%--
These comments (and silly formatting above) remove newlines so that no
leading whitespace is printed
--%><jsp:useBean class="com.peregrine.oaa.archway.User" scope="session"
id="user"/><%--

--%><%
// Code to read file and output here... sAttachment = "attachment;
filename=\""+ sFileNameAtt +"\"";
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", sAttachment);

InputStream is = null;
OutputStream out2 = null;
try
{
out2 = response.getOutputStream();
is = new FileInputStream(request.getRealPath("files/" + sDirectory +
sFileName));
int i;
while ((i=is.read()) != -1)
{
out2.write(i);
}
}catch (Exception e){}
....
%>

Hope that works for you.