微信小程式支付介面的實例詳解

微信小程式付款

• #list

• -paddingleft-2"> ;

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• #第一步
  進入小程序，下單，請求下單支付，呼叫小程式登入API來取得Openid,產生商家訂單，這些都是在小程式端完成的業務。

##第二步驟

呼叫支付統一下單API來取得prepay_id，並將小程式調起支付資料需要簽署的欄位appId，timeStamp，nonceStr，package再次簽章

• 後台程式碼

  // pages/pay/pay.jsvar app = getApp();
  Page({
      data: {},
      onLoad: function (options) {
          // 页面初始化 options为页面跳转所带来的参数
      },    /* 微信支付 */
      wxpay: function () {
          var that = this
          //登陆获取code
          wx.login({
              success: function (res) {
                  console.log(res.code)                //获取openid
                  that.getOpenId(res.code)
              }
          });
      },
      getOpenId: function (code) {
          var that = this;
          wx.request({
              url: "https://api.weixin.qq.com/sns/jscode2session?appid=wxa142513e524e496c&secret=5d6a7d86048884e7c60f84f7aa85253c&js_code=" + code + "&grant_type=authorization_code",
              data: {},
              method: 'GET',
              success: function (res) {
                  console.log('返回openId')
                  console.log(res.data)
                  that.generateOrder(res.data.openid)
              },
              fail: function () {
                  // fail
              },
              complete: function () {
                  // complete
              }
          })
      },    /**生成商户订单 */
      generateOrder: function (openid) {
          var that = this
          //统一支付
          wx.request({
              url: 'http://localhost:8070/RMS/pay_pay.action',
              method: 'GET',
              data: {
                  total_fee: '5',
                  body: '支付测试',
                  attach:'真假酒水'
              },
              success: function (res) {
                  console.log(res)                var pay = res.data                //发起支付
                  var timeStamp = pay[0].timeStamp;
                  console.log("timeStamp:"+timeStamp)                var packages = pay[0].package;
                  console.log("package:"+packages)                var paySign = pay[0].paySign;
                  console.log("paySign:"+paySign)                var nonceStr = pay[0].nonceStr;
                   console.log("nonceStr:"+nonceStr)                var param = { "timeStamp": timeStamp, "package": packages, "paySign": paySign, "signType": "MD5", "nonceStr": nonceStr };
                  that.pay(param)
              },
          })
      },    /* 支付   */
      pay: function (param) {
          console.log("支付")
          console.log(param)
          wx.requestPayment({
              timeStamp: param.timeStamp,
              nonceStr: param.nonceStr,
              package: param.package,
              signType: param.signType,
              paySign: param.paySign,
              success: function (res) {
                  // success
                  console.log("支付")
                  console.log(res)
                  wx.navigateBack({
                      delta: 1, // 回退前 delta(默认为1) 页面
                      success: function (res) {
                          wx.showToast({
                              title: '支付成功',
                              icon: 'success',
                              duration: 2000
                          })
                      },
                      fail: function () {
                          // fail
  
                      },
                      complete: function () {
                          // complete
                      }
                  })
              },
              fail: function (res) {
                  // fail
                  console.log("支付失败")
                  console.log(res)
              },
              complete: function () {
                  // complete
                  console.log("pay complete")
              }
          })
      }
  })

  
  

#後台業務邏輯涉及的工具類別及參數封裝類別

package cn.it.shop.action;import java.io.ByteArrayInputStream;import java.io.InputStream;import java.io.UnsupportedEncodingException;import java.text.SimpleDateFormat;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.SAXReader;import cn.it.shop.util.MessageUtil;import cn.it.shop.util.PayUtil;import cn.it.shop.util.PaymentPo;import cn.it.shop.util.UUIDHexGenerator;import net.sf.json.JSONArray;import net.sf.json.JSONObject;/** 
* @author 
* @version 创建时间：2017年1月21日 下午4:59:03 
* 小程序端请求的后台action，返回签名后的数据传到前台
*/public class PayAction {    private String total_fee;//总金额
    private String body;//商品描述
    private String detail;//商品详情    
    private String attach;//附加数据
    private String time_start;//交易起始时间
    private String time_expire;//交易结束时间 
    private String openid;//用户标识

    private JSONArray jsonArray=new JSONArray();    public String pay() throws UnsupportedEncodingException, DocumentException{

         body = new String(body.getBytes("UTF-8"),"ISO-8859-1");  
        String appid = "替换为自己的小程序ID";//小程序ID
        String mch_id = "替换为自己的商户号";//商户号
        String nonce_str = UUIDHexGenerator.generate();//随机字符串
        String today = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());        String code = PayUtil.createCode(8);        String out_trade_no = mch_id+today+code;//商户订单号
        String spbill_create_ip = "替换为自己的终端IP";//终端IP
        String notify_url = "http://www.weixin.qq.com/wxpay/pay.php";//通知地址
        String trade_type = "JSAPI";//交易类型  
        String openid="替换为用户的openid";//用户标识

        /**/
        PaymentPo paymentPo = new PaymentPo();

        paymentPo.setAppid(appid);
        paymentPo.setMch_id(mch_id);
        paymentPo.setNonce_str(nonce_str);        String newbody=new String(body.getBytes("ISO-8859-1"),"UTF-8");//以utf-8编码放入paymentPo，微信支付要求字符编码统一采用UTF-8字符编码
        paymentPo.setBody(newbody);
        paymentPo.setOut_trade_no(out_trade_no);
        paymentPo.setTotal_fee(total_fee);
        paymentPo.setSpbill_create_ip(spbill_create_ip);
        paymentPo.setNotify_url(notify_url);
        paymentPo.setTrade_type(trade_type);
        paymentPo.setOpenid(openid);        // 把请求参数打包成数组
        Map<String, String> sParaTemp = new HashMap<String, String>();
        sParaTemp.put("appid", paymentPo.getAppid());
        sParaTemp.put("mch_id", paymentPo.getMch_id());
        sParaTemp.put("nonce_str", paymentPo.getNonce_str());
        sParaTemp.put("body",  paymentPo.getBody());
        sParaTemp.put("out_trade_no", paymentPo.getOut_trade_no());
        sParaTemp.put("total_fee",paymentPo.getTotal_fee());
        sParaTemp.put("spbill_create_ip", paymentPo.getSpbill_create_ip());
        sParaTemp.put("notify_url",paymentPo.getNotify_url());
        sParaTemp.put("trade_type", paymentPo.getTrade_type());
        sParaTemp.put("openid", paymentPo.getOpenid());        // 除去数组中的空值和签名参数
        Map<String, String> sPara = PayUtil.paraFilter(sParaTemp);        String prestr = PayUtil.createLinkString(sPara); // 把数组所有元素，按照“参数=参数值”的模式用“&”字符拼接成字符串
        String key = "&key=替换为商户支付密钥"; // 商户支付密钥
        //MD5运算生成签名
        String mysign = PayUtil.sign(prestr, key, "utf-8").toUpperCase();
        paymentPo.setSign(mysign);        //打包要发送的xml
        String respXml = MessageUtil.messageToXML(paymentPo);        // 打印respXml发现，得到的xml中有“”不对，应该替换成“_”
        respXml = respXml.replace(, "_");        String url = "https://api.mch.weixin.qq.com/pay/unifiedorder";//统一下单API接口链接
        String param = respXml;        //String result = SendRequestForUrl.sendRequest(url, param);//发起请求
        String result =PayUtil.httpRequest(url, "POST", param);        // 将解析结果存储在HashMap中
        Map<String, String> map = new HashMap<String, String>();
         InputStream in=new ByteArrayInputStream(result.getBytes());  
        // 读取输入流
        SAXReader reader = new SAXReader();
        Document document = reader.read(in);        // 得到xml根元素
        Element root = document.getRootElement();        // 得到根元素的所有子节点
        @SuppressWarnings("unchecked")        List<Element> elementList = root.elements();
        for (Element element : elementList) {            map.put(element.getName(), element.getText());
        }        // 返回信息
        String return_code = map.get("return_code");//返回状态码
        String return_msg = map.get("return_msg");//返回信息
        System.out.println("return_msg"+return_msg);
        JSONObject JsonObject=new JSONObject() ;        if(return_code=="SUCCESS"||return_code.equals(return_code)){            // 业务结果
            String prepay_id = map.get("prepay_id");//返回的预付单信息
            String nonceStr=UUIDHexGenerator.generate();
            JsonObject.put("nonceStr", nonceStr);
            JsonObject.put("package", "prepay_id="+prepay_id);
            Long timeStamp= System.currentTimeMillis()/1000;
            JsonObject.put("timeStamp", timeStamp+"");            String stringSignTemp = "appId="+appid+"&nonceStr=" + nonceStr + "&package=prepay_id=" + prepay_id+ "&signType=MD5&timeStamp=" + timeStamp;            //再次签名
            String paySign=PayUtil.sign(stringSignTemp, "&key=替换为自己的密钥", "utf-8").toUpperCase();
            JsonObject.put("paySign", paySign);
            jsonArray.add(JsonObject);
        }        return "pay";

    }    public String getTotal_fee() {        return total_fee;
    }    public void setTotal_fee(String total_fee) {
        this.total_fee = total_fee;
    }    public String getBody() {        return body;
    }    public void setBody(String body) {
        this.body = body;
    }    public JSONArray getJsonArray() {        return jsonArray;
    }    public void setJsonArray(JSONArray jsonArray) {
        this.jsonArray = jsonArray;
    }    public String getDetail() {        return detail;
    }    public void setDetail(String detail) {
        this.detail = detail;
    }    public String getAttach() {        return attach;
    }    public void setAttach(String attach) {
        this.attach = attach;
    }    public String getTime_start() {        return time_start;
    }    public void setTime_start(String time_start) {
        this.time_start = time_start;
    }    public String getTime_expire() {        return time_expire;
    }    public void setTime_expire(String time_expire) {
        this.time_expire = time_expire;
    }    public String getOpenid() {        return openid;
    }    public void setOpenid(String openid) {
        this.openid = openid;
    }
}

• 第一次寫，寫的不是太完整，希望和大家多多交流，一起進步。

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