初学者问个问题！！！ 该代码如何实现 不是指定路径 而是点击下载按钮后实现 选择路径下载

@RequestMapping("/excel")
public void excel(HttpServletResponse response, HttpServletRequest request,StatisticsSearchForm statisticsSearchForm)throws Exception{
List list = statisticsService.findBySearchFrom(statisticsSearchForm);
for(StatisticsDTO statisticsDTO : list){
statisticsDTO.getId();
statisticsDTO.getNewUserCount();
statisticsDTO.getTotalPayCount();
statisticsDTO.getTotalPayNum();
statisticsDTO.getWeixinpayPayCount();
statisticsDTO.getWeixinpayPayNum();
statisticsDTO.getAlipayPayCount();
statisticsDTO.getAlipayPayNum();
statisticsDTO.getDggPayCount();
statisticsDTO.getDggPayNum();
statisticsDTO.getCreateTime();
}
FileOutputStream outputStream = null;
try {
outputStream = new FileOutputStream("d:\tongji.xls");
}catch (FileNotFoundException e){
e.printStackTrace();
}
cn.business.util.ExcelUtil util = new cn.business.util.ExcelUtil(StatisticsDTO.class);
util.exportExcel(list,"统计",outputStream);
}

outputStream = new FileOutputStream("d:\tongji.xls");
这个路径不是你客户端保存文件的路径，而是你服务器生成excel的路径，你应该把它返回到response流，设置好content-type，那么浏览器自动就会提示用户保存下载文件，并且选择路径的。