@PostMapping("/gotoPayPage")
public void gotoPayPage(HttpServletResponse response) throws AlipayApiException, IOException {
    // 订单模型
    String productCode = "FAST_INSTANT_TRADE_PAY";
    AlipayTradePagePayModel model = new AlipayTradePagePayModel();
    model.setOutTradeNo(UUID.randomUUID().toString());
    model.setSubject("支付测试");
    model.setTotalAmount("0.01");
    model.setBody("支付测试，共0.01元");
    model.setProductCode(productCode);

    AlipayTradePagePayRequest pagePayRequest =new AlipayTradePagePayRequest();
    pagePayRequest.setReturnUrl("http://s9v2cw.natappfree.cc/alipay/page/returnUrl");
    pagePayRequest.setNotifyUrl(alipayProperties.getNotifyUrl());
    pagePayRequest.setBizModel(model);

    // 调用SDK生成表单, 并直接将完整的表单html输出到页面
    String form = alipayClient.pageExecute(pagePayRequest).getBody();
    response.setContentType("text/html;charset=" + alipayProperties.getCharset());
    response.getWriter().write(form);
    response.getWriter().flush();
    response.getWriter().close();
}
 

public PagePayChain(AlipayClient alipayClient, AlipayTradePagePayModel alipayTradePagePayModel) {
    this.alipayClient = alipayClient;
    this.alipayTradePagePayModel = alipayTradePagePayModel;
}