spring ie8 提示保存文件

@RequestMapping(value="add", method=RequestMethod.POST)
//@ResponseBody这个去掉,返回类型如下
@MethodLog("添加用户")
	public ResponseEntity<String>  add(HttpServletRequest reuqest, User user) throws Exception {
		HttpHeaders responseHeaders = new HttpHeaders();
	    responseHeaders.setContentType(MediaType.TEXT_HTML);
		try {
			return new ResponseEntity<String>(String.valueOf(userService.insert(user)), responseHeaders, HttpStatus.OK);
		} catch (Exception e) {
			e.printStackTrace();
			throw e;
		}
	}