⼩程序⽀付功能—Java代码实现摘要
本篇⽂章带⼤家实现⼩程序⽀付，有需要的伙伴可以参考借鉴⼀下。
注意事项
开发⼩程序⽀付功能前，需要登录⼩程序后台开通⽀付功能
步骤
第⼀步：获取⽀付所需参数
获取⽀付时所需openId参考此篇博⽂：
⼩程序页⾯（wxPay.js）代码：
写文章的小程序后端Java代码：wx .login ({  success : res => {    // 发送 de 到后台换取 openId, sessionKey, unionId      wx .request ({      url : that .data .url + '/mini_Weixin_getOpenId.action',      data :{"code":res .code },      method :'GET',      header : {        'content-type': 'application/json'      },      success : function  (res ) {          openId = res .data ;          wx .request ({            url : that .data .url + 'xxx_getPayParameter.action',            data :{"openId":openId ,"totalAmount":payData .payAmount ,"orderId":payData .orderId },            method :'GET',            header : {              'content-type': 'application/json'            },            success : function  (res ) {              that .goPay (res );  //调⽤⽀付                          }          })      }    })  } })
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28/** * ⼩程序统⼀下单接⼝，并返回相关参数 */public  String getPayParameter (){  try  {  String notify_url = "⽀付成功回调地址";  reqIp = getIpAddress ();  JSONObject json = new  JSONObject ();  String totalFeeStr = "";//原始的⽀付⾦额，单位元  Float totalFee = 0.0f ;  //随机数  String nonce_str = UUID .randomUUID ().toString ().replaceAll ("-", "");  //商品描述  String body = "测试";  //商户订单号  String out_trade_no = orderId ;  //总⾦额  Integer total_fee = 0;//转化成单位，元--分    String time_start =DateUtil .formatDateTime ();  double  totalAmount_all = 0;  logger .info ("/ns/toPay=reqIP==="+reqIp );  totalAmount_all = Arith .add (totalAmount_all , Double .valueOf (totalAmount ));  totalFeeStr = Double .toString (totalAmount_all );  totalFee = new  Float (totalAmount_all );  total_fee = Math .round (totalFee *100);//转化成单位，元--分  logger .info ("/ns/toPay=totalFeeStr==="+totalFeeStr );  logger .info ("/ns/toPay=totalFee==="+totalFee );  logger .info ("/ns/toPay=total_fee==="+total_fee );  logger .info ("/ns/toPay=body==="+body );1
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//获取统⼀下单需要的openid  logger .info ("weixToPay.openId:===@==" + openId );  try  {  if (openId ==null ||"".equals (openId )){    logger .info ("获取统⼀下单需要的openid 失败！");    return  json .toString ();  }  } catch  (Exception e ) {  e .printStackTrace ();  return  null ;  }  //获取sign  SortedMap <String , String > packageParams = new  TreeMap <String , String >();  packageParams .put ("appid
", "⼩程序appId");  packageParams .put ("mch_id","商户号");  packageParams .put ("nonce_str", nonce_str );  packageParams .put ("body", body );  packageParams .put ("out_trade_no", out_trade_no );  packageParams .put ("total_fee", total_fee +"");  packageParams .put ("spbill_create_ip", reqIp );  packageParams .put ("notify_url", notify_url );  packageParams .put ("trade_type", "JSAPI");    packageParams .put ("openid", openId );    RequestHandler reqHandler = new  RequestHandler (this .getRequest (), this .getResponse ());  reqHandler .init ("⼩程序appId", "⼩程序appsecret", "商户密钥");    String sign = reqHandler .createSign (packageParams );  //System.out.println("sign:===@=="+sign);  String xml ="<xml>"+    "<appid>"+appId +"</appid>"+    "<mch_id>"+商户号+"</mch_id>"+    "<nonce_str>"+nonce_str +"</nonce_str>"+    "<sign>"+sign +"</sign>"+    "<body><![CDATA["+body +"]]></body>"+    "<out_trade_no>"+out_trade_no +"</out_trade_no>"+    "<total_fee>"+total_fee +"</total_fee>"+    "<spbill_create_ip>"+reqIp +"</spbill_create_ip>"+  //终端ip    "<notify_url>"+notify_url +"</notify_url>"+    "<trade_type>JSAPI</trade_type>"+    "<openid>"+openId +"</openid>"+    "</xml>";  logger .info ("xml ：===@=="+xml );    //获取预⽀付prepay_id  String createOrderURL = "h.weixin.qq/pay/unifiedorder";  String prepay_id ="";  try  {  prepay_id = MiniUtil .getPayNo (createOrderURL , xml );  logger .info ("获取预⽀付prepay_id:===@==" + prepay_id );  if (prepay_id .equals ("")){    json .put ("orderId", orderId );    json .put ("orderName", body );    json .put
("totalFee", totalFeeStr );    json .put ("createTime", time_start );    json .put ("ErrorMsg", "统⼀⽀付接⼝获取预⽀付订单出错");    return  json .toString ();      }  } catch  (Exception e1) {    e1.printStackTrace ();34
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}  SortedMap <String , String > finalpackage = new  TreeMap <String , String >();  String timestamp =
String .valueOf (System .currentTimeMillis () / 1000);  String packages = "prepay_id="+prepay_id ;  finalpackage .put ("appId", "appId");  finalpackage .put ("timeStamp", timestamp );  finalpackage .put ("nonceStr", nonce_str );  finalpackage .put ("package", packages );  finalpackage .put ("signType", "MD5");  String finalsign = reqHandler .createSign (finalpackage );  json .put ("appid", "appId");  json .put ("timeStamp", timestamp );  json .put ("nonceStr", nonce_str );  json .put ("createTime", time_start );  json .put ("package", packages );  json .put ("paySign", finalsign );  json .put ("orderId", orderId );  json .put ("payPrice", total_fee );  //⽀付⾦额，单位分  json .put ("totalFeeStr", totalFeeStr ); //原始的⽀付⾦额，单位元  return  json .toString ();  } catch  (NumberFormatException e ) {  e .printStackTrace ();  logger .info (e );  return  null ; }}/*** 加法运算。* @param v1 被加数* @param v2 加数* @return 两个参数的和*/public  static  double  add (double  v1,double  v2){    BigDecimal b1 = new  BigDecimal (Double .toString (v1));    BigDecimal b2 = new  BigDecimal (Double .toString (v2));    return  b1.add (b2).doubleValue ();}/*** 获取⽀付时所需Ip 地址* @return */public  String getIpAddress () {  HttpServletRequest request = this .getRequest ();      String ip = request .getHeader ("x-forwarded-for");        if  (ip == null || ip .length () == 0 || "unknown".equalsIgnoreCase (ip )) {            ip = request .getHeader ("Proxy-Client-IP");        }        if  (ip == null || ip .length () == 0 || "unknown".equalsIgnoreCase (ip )) {            ip = request .getHeader ("WL-Proxy-Client-IP");        }        if  (ip == null || ip .length () == 0 || "unknown".equalsIgnoreCase (ip )) {            ip = request .getHead
er ("HTTP_CLIENT_IP");        }        if  (ip == null || ip .length () == 0 || "unknown".equalsIgnoreCase (ip )) {            ip = request .getHeader ("HTTP_X_FORWARDED_FOR");        }        if  (ip == null || ip .length () == 0 || "unknown".equalsIgnoreCase (ip )) {            ip = request .getRemoteAddr ();        }        return  ip ;  99
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RequestHandler ⼯具类：
164public  class  RequestHandler {/** Token 获取⽹关地址地址 */ private  String tokenUrl ; /** 预⽀付⽹关url 地址 */ private  String gateUrl ; /** 查询⽀付通知⽹关URL */ private  String notifyUrl ; /** 商户参数 */ private  String appid ; private  String appkey ; private  String partnerkey ; private  String appsecret ; private  String key ; /** 请求的参数 */ private  SortedMap parameters ; /** Token */ private  String Token ; private  String charset ; /** debug 信息 */ private  String debugInfo ; private  String last_errcode ; private  HttpServletRequest request ; private  HttpServletResponse response ; /**  * 初始构造函数。  *  * @return  */ public  RequestHandler (HttpServletRequest request ,  HttpServletResponse response ) {  this .last_errcode = "0";  this .request = request ;  this .response = response ;  //this.charset = "GBK";  this .charset = "UTF-8";  this .parameters = new  TreeMap ();  // 验证notify ⽀付订单⽹关  notifyUrl = "gw.tenpay/l";  } /**  * 初始化函数。  */ public  void  init (String app_id , String app_secret , String partner_key ) {  this .last_errcode = "0";  this .Token = "token_";  this .debugInfo = "";  this .appid = app_id ;  this .partnerkey = partner_key ;  this .appsecret = app_secret ;  this .key = partner_key ; } public  void  init () { }1
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