struts and file download

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MileHighCelt - 18 Jan 2006 22:52 GMT

I am getting an Outputstream already obtained when my Action passes the
HttpServletResponse to another method, which then does:

response.setContentType("text/csv");
response.setHeader("Content-disposition",
attachment.toString());
response.setHeader("Pragma", null);
response.setHeader("Cache-Control","no-store");

....
OutputStream os = response.getOutputStream();
....
os.write(s.getBytes()); // where s is a String;

then it writes some strings to that stream. The problem seems to
be that somewhere after this code the IllegalStateException is being
thrown. I am trapping it in my code but it isn't occuring there.

So my question is, what is the preferred method of returning a file for
the user to download when they click a button/link to trigger this
action? Is struts already using the HttpServletResponse and triggering
all these exceptions?

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MileHighCelt - 19 Jan 2006 21:21 GMT

Nevermind - I found that if I use a printwriter instead of the
OutputStream this clears up. For those looking for a solution, try :

StringBuffer attachment = new StringBuffer();

attachment.append("attachment;filename=").append(file.getName());
try {
     response.setContentType(contentType);
    response.setContentLength((int) file.length());
    response.setHeader("Content-disposition", attachment.toString());
    java.io.PrintWriter os = response.getWriter();

     BufferedReader reader = new BufferedReader(new FileReader(file));
    String line;

    char[] buffer = new char[4096];
    int read = 0;

    while((read = reader.read(buffer))>0) {
    line = new String(buffer,0,read);
    os.write(line);
    }
    os.flush();
    close();
    reader.close();

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struts and file download

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