生成二维码

	@ApiOperation(value = "获取注册二维码")
	@GetMapping("/get/user/getqrcode")
	public void getQrCode(HttpServletResponse response, HttpServletRequest request) throws Exception {

		String optimalDomain = request.getParameter("optimalDomain");
		String webankAppId = request.getParameter("webankAppId");
		String version = request.getParameter("version");
		String nonce = request.getParameter("nonce");
		String orderNo = request.getParameter("orderNo");
		String faceId = request.getParameter("faceId");
		String url = request.getParameter("url");
		String userId = request.getParameter("userId");
		String sign = request.getParameter("sign");
		String from = request.getParameter("from");
		String redirectType = request.getParameter("redirectType");
		response.setDateHeader("Expires", 0);
		response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
		response.addHeader("Cache-Control", "post-check=0, pre-check=0");
		response.setHeader("Pragma", "no-cache");
		response.setContentType("image/jpeg");

		// 生成指定url对应的二维码到文件，宽和高都是300像素
		String faceUrl = "https://" + optimalDomain + "/api/web/login?webankAppId=" + webankAppId + "&version="
				+ version + "&nonce=" + nonce + "&orderNo=" + orderNo + "&faceId=" + faceId + "&url=" + url + "&from="
				+ from + "&userId=" + userId + "&sign=" + sign + "&redirectType=" + redirectType;
		QrCodeUtil.generate(faceUrl, 300, 300, "jpg", response.getOutputStream());
	}

<div>
    <img src="" id="getqrcode">
</div>

$($('#getqrcode').attr("src","/user/get/user/getqrcode");