5, return_url: page jump page andsynchronous path is paid after the success of a rebound of the Alipay page. "The complete path, http:// format can not add id=123? This kind of custom parameters must be outside the network can access", Alipay defined the page behind not custom parameters rebound, so we have to judge is according to some type of jump a little trouble. I do a clever practice here: first, the Java code in return_url.jsp is also directly moved, slightly modified (for springmvc), my jump address is IP/aliPay/returnUrl, and then new ModelAndView (