java web 下载

public void export() throws IOException{
		HttpServletResponse response = Struts2Utils.getResponse();
		Date date = new Date();
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		String fileName = sdf.format(date) + "远程用户";
		fileName = new String(fileName.getBytes("gb2312"), "iso8859-1");
		response.addHeader("Content-Disposition", "attachment; filename="+ fileName + ".txt"); 
		response.setContentType("text/plain");
		PrintWriter out=response.getWriter();
		List<AykjSysUser> users=sysUserService.getAuditedUsers();
			for(AykjSysUser user:users){
			String passwd=interlibUserDao.getInterlibPassword(user.getReadercardno());
			out.write(user.getReadercardno()+","+passwd+","+user.getRealname()+"\r\n");
		}
			out.close();
	}