生成/下载CSV文件而不存储在服务器上

Question

I'm using the apache.commons.csv library in Java to generate CSV and make it downloadable without storing on server using following code:

try (OutputStreamWriter osw = new OutputStreamWriter(response.getOutputStream())){
        csvWriter = new CSVPrinter(osw,CSVFormat.DEFAULT);

        writer.printRecord(row);
        response.setContentType("text/csv");
        response.setHeader("Content-disposition", "attachment; filename=\"" + fileName + "\";");
catch(Exception e) {
        //Exception block
}
finally {
        try {
            csvWriter.flush();
        } catch (IOException e) {
            logger.error("Exception while flushing file writer and CSV writer",e);
        }

    }

But it showing csv on browser, rather than asking me save as option for download.

What is wrong in the code or is there any other way to do the same?

Answer 1

You can refer below code. This will ask you for 'Save' popup.

set your data in request attribute as ArrayList like request.setAttribute("list", list) and send it to JSP file.

Write this code in your JSP file.

<%
    response.setContentType("application/vnd.ms-excel");
    response.setHeader("Content-disposition","attachment; filename=Report_File_Name.xls");
    response.setHeader("CookiesConfigureNoCache", "false");             
    response.setHeader("Pragma","private,no-cache");     
    response.setHeader("Cache-control","private,no-store,no-cache,max-age=0,must-revalidate");

    ArrayList<String> List = (ArrayList<String>) request.getAttribute("list");
        for(int i = 0; i < List.size(); i++){
    %>
            <%=List.get(i).toString()%><br>
    <%
        }

    %>