code: public static void wapPay(HttpServletResponse response, AlipayTradeWapPayModel model, String returnUrl,
  			String notifyUrl) throws AlipayApiException, IOException {
  		String form = wapPayStr(response, model, returnUrl, notifyUrl);
  		HttpServletResponse httpResponse = response;
  		httpResponse.setContentType("text/html;charset=" + AliPayApiConfigKit.getAliPayApiConfig().getCharset());
  		httpResponse.getWriter().write(form);// 直接将完整的表单html输出到页面
  		httpResponse.getWriter().flush();
  	}
docs: WAP支付
  
  @param response
  {HttpServletResponse}
  @param model
  {AlipayTradeWapPayModel}
  @param returnUrl
  异步通知URL
  @param notifyUrl
  同步通知URL
  @throws {AlipayApiException}
  @throws {IOException}