支付宝小程序前端returnUrl未编码会报错解决，需要加上url编码 URLEncoder.encode

支付宝小程序前端returnUrl未编码会报错解决，需要加上url编码

log.info("创建免押加密请求: {}", JSON.toJSONString(encryptedRequest));
String encodedReturnUrl = returnUrl;
            try {
                encodedReturnUrl = URLEncoder.encode(returnUrl, "UTF-8");
            } catch (UnsupportedEncodingException e) {
                throw new RuntimeException(e);
            }