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直接上在Spring中下载Excel文件的例子，重点是包含有utf8的那一句，将ISO-8859-1编码格式改为utf8格式的。
对于IE浏览器必须使用URLEncoder转换，不然下载的时候会报错。
其中fileName = fileName.replaceAll(“\\+”, “%20″);可以修正URLEncoder将空格转换成+号的BUG。

	@RequestMapping(method = RequestMethod.GET, params="action=exportExcel")
	public void envExportExcel(HttpServletRequest request, HttpServletResponse response) throws IOException {
		response.setContentType("application/vnd.ms-excel");//设置输出格式 Excel 头信息.
		String fileName = "测试文件名";
		String agent = request.getHeader("USER-AGENT");
		if(agent != null && agent.indexOf("MSIE") != -1) {
			fileName = URLEncoder.encode(fileName, "UTF8");
			fileName = fileName.replaceAll("\\+", "%20");
		} else {
			fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1");
		}

		response.setHeader("Content-Disposition","attachment; filename=\"" + fileName + ".xls" + "\";target=_blank");

		OutputStream os = response.getOutputStream();
		HSSFWorkbook wb = service.exportExcelFile();
		wb.write(os);
		os.close();
		response.flushBuffer();
	}