springmvc上传List，

@RequestMapping("pay")
public ModelAndView pay(String orderNo, TransactionDTO transaction, @RequestParam("secretImg") List<String> secretImg, Integer payMethod) {
ModelAndView mv = new ModelAndView();
if (StringTool.isEmptyByTrim(orderNo) || transaction == null || payMethod == null || payMethod == PayMethod.PAYPAL) {
mv.setViewName("");
return mv;
}
transaction.setImgUrl(StringTool.list2Str(secretImg, "|"));
orderService.payOrder(header(), orderNo, transaction, payMethod);
mv.setViewName("redirect:/payment/payresult.cf?orderNo=" + orderNo);
return mv;
}