jsp 与 csv 下载

   response.setHeader("Content-Disposition", "attachment; filename=\"" + "reportByProject.csv" + "\"");
   response.setCharacterEncoding("GB2312");
   response.setContentType("text/plain;charset=GB2312");
   PrintWriter writer = response.getWriter();
   writer.write(datas.toString());
   writer.flush();
   writer.close();