java 下载文件

HTML页面代码

function down(index){
	var rowdata=_result[index];
	var hqId=rowdata.hqId;
	var url = "../rest/hisQueTemp/down?hqId="+hqId;  //mybatis+spring  
    url = encodeURI(url);
    location.href = url; 
}

后台代码

/**
     * 下载
     * @return
     */
    @RequestMapping(value = "/down")//POST
    @ResponseBody
    public void downTXT(String hqId, Model model, HttpServletRequest request, HttpServletResponse response)  throws IOException{
		TAicsHistoryQuestionTemp hq = tAicsHistoryQuestionTempMapper.selectByPrimaryKey(Long.parseLong(hqId));
		String str = hq.getHqPath();
		String strName = str.split("__")[1];
		String fileType = str.substring(str.lastIndexOf(".") + 1);
		System.out.println(str);
		File f = new File(str);
		
		// 设置response参数，可以打开下载页面
		response.reset();
		response.setContentType("application/vnd.ms-excel;charset=utf-8");
		try { 
			response.setHeader("Content-Disposition",
					"attachment;filename=" + new String((strName).getBytes(), "iso-8859-1"));// 下载文件的名称 
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		ServletOutputStream out = response.getOutputStream();
		BufferedInputStream bis = null;
		BufferedOutputStream bos = null;
		try {
			bis = new BufferedInputStream(new FileInputStream(f));
			bos = new BufferedOutputStream(out);
			byte[] buff = new byte[2048];
			int bytesRead;
			while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
				bos.write(buff, 0, bytesRead);
			}
		} catch (final IOException e) {
			e.printStackTrace();
			throw e;
		} finally {
			if (bis != null)
				bis.close();
			if (bos != null)
				bos.close();
		}
	}