How to use java to realize WeChat Pay's official account payment

< 32 ; i ++ ){ sb.append(str.charAt(rd.nextInt(str.length()))); } return sb.toString(); } /** * 插入XML标签 * @param sb * @param Key * @param value * @return */ public static StringBuilder setXmlKV(StringBuilder sb,String Key,String value){ sb.append(""); sb.append(value); sb.append(""); return sb; } /** * 解析XML 获得名称为para的参数值 * @param xml * @param para * @return */ public static String getXmlPara(String xml,String para){ int start = xml.indexOf(""); int end = xml.indexOf(""); if(start < 0 && end < 0){ return null; } return xml.substring(start + ("").length(),end).replace("",""); } /** * 获取ip地址 * @param request * @return */ public static String getIpAddr(HttpServletRequest request) { InetAddress addr = null; try { addr = InetAddress.getLocalHost(); } catch (UnknownHostException e) { return request.getRemoteAddr(); } byte[] ipAddr = addr.getAddress(); String ipAddrStr = ""; for (int i = 0; i < ipAddr.length; i++) { if (i >

0) {ipAddrStr + = ".";} ipAddrStr + = ipAddr [I] & 0xFF;} return ipAddrStr;}}

② constant class (set according to merchant information):

Public class WxPayConstants {/ / third-party user unique ID public static String APPID = ""; / / third-party user unique credential password public static String APP_SECRET = ""; / / Merchant ID public static String MCH_ID = ""; / / Wechat Merchant platform-account Settings-Security Settings-api Security, configure 32-bit key public static String KEY = ""; / / transaction type public static String TRADE_TYPE_JS = "JSAPI" / / WeChat Pay callback url public static String NOTIFY_URL = "";}

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