WeChat scan code payment (Mode 1)

Problems encountered by WeChat scan code payment

• Native payment URL parameter error

• CallbackInterfaceThe URL has a callback, but the parameters cannot be received

• Merchant backend The returned data field structure is illegal

• Timed out to obtain merchant order information or the httpcode returned by the merchant was not 200

Solution to the problem

• Native payment URL parameter error
  This error generally occurs when the QR code is generated and scanned on WeChat after obtaining the QR code URL. If you encounter this type of problem, please check

1. Whether there are errors in the parameters in the parameter list required to generate the QR code (case sensitive)
2. Sign in the parameters Correct signature algorithm at the time Signature verification tool

The following is the code to generate the QR code URL

/**
?*?
?*?@author?Javen
?*?2016年5月14日
?*?掃碼支付獲取二維碼URL（模式一）
?*/
public?String?getCodeUrl(){
????String?url="weixin://wxpay/bizpayurl?sign=XXXXX&appid=XXXXX&mch_id=XXXXX&product_id=XXXXX&time_stamp=XXXXX&nonce_str=XXXXX";
????String?product_id="001";
????String?timeStamp=Long.toString(System.currentTimeMillis()?/?1000);
????String?nonceStr=Long.toString(System.currentTimeMillis());
????Map<String, String>?packageParams?=?new?HashMap<String, String>();
????packageParams.put("appid",?appid);
????packageParams.put("mch_id",?partner);
????packageParams.put("product_id",product_id);
????packageParams.put("time_stamp",?timeStamp);
????packageParams.put("nonce_str",?nonceStr);
????String?packageSign?=?PaymentKit.createSign(packageParams,?paternerKey);
????return?StringUtils.replace(url,?"XXXXX",?packageSign,appid,partner,product_id,timeStamp,nonceStr);
}

• The callback interface URL has a callback , but the parameters cannot be received

  Enumeration en=getParaNames();

  ??while?(en.hasMoreElements())?{
  ??????Object?o=?en.nextElement();
  ??????System.out.println(o.toString()+"="+getPara(o.toString()));
  ??}

The parameters output in the above code are all NULL

Since the official document description is not very clear, everyone thinks that the callback request will take the productid and user's openid and other parameters as ordinary parameters. In fact, the parameter returned by this callback is an XMLInput stream

HttpServletRequest?request?=?getRequest();
?????????/**
?????????*?獲取用戶掃描二維碼后，微信返回的信息
?????????*/
????????InputStream?inStream?=?request.getInputStream();
????????ByteArrayOutputStream?outSteam?=?new?ByteArrayOutputStream();
????????byte[]?buffer?=?new?byte[1024];
????????int?len?=?0;
????????while?((len?=?inStream.read(buffer))?!=?-1)?{
????????????outSteam.write(buffer,?0,?len);
????????}
????????outSteam.close();
????????inStream.close();
????????String?result??=?new?String(outSteam.toByteArray(),"utf-8");

resultThe result is

< ;return_msg>

< ;![CDATA[1322117501]]>



<![CDATA[wx2016051 51311568e801d50fb0555050106]] ></prepay_id><br><trade_type><![CDATA[NATIVE]]></trade_type><br><code_url>![CDATA[weixin://wxpay/bizpayurl?pr =Gj3ZF2b]]</code_url><br></xml></p> <p>If the returned return_code result_code is not SUCCESS and the callback interface does not return any data or the returned data is illegal, the following error will occur </p> <ul class=" list-paddingleft-2"> <li><p>The data field structure returned by the merchant's background is illegal (the format of the returned data packet is incorrect) </p></li> <li><p>Timed out to obtain the merchant's order information or the merchant returned The httpcode is not 200 (no returned data packet)</p></li> </ul> <p>If there are no problems with the above, the last step is left. The merchant's backend system returns the prepay_id to the WeChat payment system. The following is the details Code </p> <pre class="brush:php;toolbar:false">/** ?*?@author?Javen ?*?2016年5月14日 ?*?掃碼支付回調(diào)（模式一） ?*/

Public void wxpay () {
Try {
httpservletRequest Request = getRequest () /** ## r 代

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