java微信支付怎么模拟通知 java实现微信小程序支付

转载

编程小匠人传奇 2023-07-13 20:21:34

文章标签 java微信支付开发流程 json List 数据 文章分类 Java 后端开发

微信端代码如下：

支付按钮：

<view class="container">
     <input bindinput="getOrderCode" style="border:1px solid #ccc;" type="text" placeholder="请填写订单号" />
     <button bindtap="pay">立即支付</button></view>

js代码：

pay() {
         let orderCode = this.orderCode;
         wepy.login({
           success: res => {
             if (res.code) {
               HTTP.get({
                 url: constant.restServer.host + '/weChatApplePay/toPay',
                 params: {
                   key: constant.restServer.wxapp_id,
                   code: res.code,
                   orderCode: orderCode
                 },
                 headers: {
                   'Content-Type': 'application/json'
                 },
                 mask: false,
                 loading: false,
               }).then((data) => {
                 console.log('后台下单返回数据', data)
                 wx.requestPayment({
                   timeStamp: data.data.timeStamp,
                   nonceStr: data.data.nonceStr,
                   package: data.data.package,
                   signType: data.data.signType,
                   paySign:  data.data.paySign,
                   success: res => {
                     console.log(res);
                   },
                   fail: () => {
                     console.log(res);
                   },
                   complete: () => {
                     console.log(res);
                   }                })
               }).
               catch((error) => {
                 console.log('app.wpy signin login get jscode error...', error)
               })
             } else {
               console.log('获取用户登录态失败！' + res.errMsg)
             }
           }
         });
       },
       //获取订单号  自定义输入
       getOrderCode(e) {
         this.orderCode = e.detail.value;
         this.$apply();
       },
     };

后台实现代码才用java编写：

Controller：

public static final String PATH = "weChatApplePay";

@Autowired
private WechatServiceApplet wechatServiceApplet;

@ApiOperation("微信小程序统一下单接口")
@RequestMapping(value = "toPay", method = RequestMethod.GET)
public RestfulApiResponse<JSONObject> toPay(@RequestParam @ApiParam(value = "登录返回的code 换取openid的登录凭证", required = true) String code, @RequestParam @ApiParam(value = "订单号", required = true) String orderCode, @RequestParam @ApiParam(value = "订单号", required = true) String key) {
   return RestfulApiResponse.success("获取成功",wechatServiceApplet.toPay(code,orderCode,key));
}

@ApiOperation("微信端回调地址 后期需要修改订单状态")
@RequestMapping(value = "payResult", method = {RequestMethod.GET, RequestMethod.POST})
public void payResult(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
   String reqParams = StreamUtil.read(request.getInputStream());
   System.out.println("-------支付结果:"+reqParams);
   StringBuffer sb = new StringBuffer("<xml><return_code>SUCCESS</return_code><return_msg>OK</return_msg></xml>");
   response.getWriter().append(sb.toString());
}

wechatServiceApplet：

private static final Logger logger = LoggerFactory.getLogger(WechatServiceApplet.class);
@Autowired
private AppletSettingService appletSettingService;

//发起支付
public JSONObject toPay(String code, String orderCode, String key) {
    try {
        AppletSetting appletSetting = appletSettingService.selectByKey(key);  //这个是我自定义  根据key  取后台appId,根据场景，自定义。
        if (null == appletSetting)
            throw new AppletSettingException("该小程序信息不存在");
        OrderInfo order = new OrderInfo();
        order.setAppid(appletSetting.getAppId());
        order.setMch_id(Configure.getMch_id());//后期需要从数据库中取数据
        order.setNonce_str(RandomStringGenerator.getRandomStringByLength(32));
        order.setBody("dfdfdf");
        order.setOut_trade_no(orderCode);
        order.setTotal_fee("1");//从前端传数据
        order.setSpbill_create_ip("");//后期需要从数据库中取数据  终端IP
        
        order.setNotify_url("");//测环境  后期需要从数据库中取数据
        order.setTrade_type("JSAPI");
        order.setSign_type("MD5");
        return getOrder(order, code,appletSetting);
    } catch (Exception e) {
        e.printStackTrace();
        logger.error("-------", e);
    }
    return null;

}

//下单 生成prepay_id  用于签名 小程序端发起支付
private JSONObject getOrder(OrderInfo order, String code,AppletSetting appletSetting) throws UnrecoverableKeyException, KeyManagementException, KeyStoreException, NoSuchAlgorithmException, ClientProtocolException, IllegalAccessException, ServletException, IOException {

    //生成签名
    order.setOpenid(getOpenId(code,appletSetting));
    String sign = Signature.getSign(order);
    order.setSign(sign);
    String result = HttpRequest.sendPost(WechatAppletConfig.APPLET_PAY, order);
    logger.info("---------下单返回:" + result);
    return sign(convertXml(result).getPrepay_id(),appletSetting);


}

//下单之后的签名小程序端发起支付
private JSONObject sign(String repay_id,AppletSetting appletSetting) throws IllegalAccessException {
    SignInfo signInfo = new SignInfo();
    signInfo.setAppId(appletSetting.getAppId());
    long time = System.currentTimeMillis() / 1000;
    signInfo.setTimeStamp(String.valueOf(time));
    signInfo.setNonceStr(RandomStringGenerator.getRandomStringByLength(32));
    signInfo.setRepay_id("prepay_id=" + repay_id);
    signInfo.setSignType("MD5");
    //生成签名
    String sign = Signature.getSign(signInfo);

    JSONObject json = new JSONObject();
    json.put("timeStamp", signInfo.getTimeStamp());
    json.put("nonceStr", signInfo.getNonceStr());
    json.put("package", signInfo.getRepay_id());
    json.put("signType", signInfo.getSignType());
    json.put("paySign", sign);
    return json;
}

//获取openId  用于下单参数
private String getOpenId(String code,AppletSetting appletSetting) throws ServletException, IOException {
    HttpGet httpGet = new HttpGet("https://api.weixin.qq.com/sns/jscode2session?appid=" + appletSetting.getAppId() + "&secret=" + appletSetting.getAppSecret() + "&js_code=" + code + "&grant_type=authorization_code");
    //设置请求器的配置
    HttpClient httpClient = HttpClients.createDefault();
    HttpResponse res = httpClient.execute(httpGet);
    HttpEntity entity = res.getEntity();
    String result=EntityUtils.toString(entity, "UTF-8");
    return convertOpenId(result);

}

//结果转Map  取出openId
private  String convertOpenId(String result){
    Gson gson = new Gson();
    Map<String, Object> map = new HashMap<String, Object>();
    map = gson.fromJson(result, map.getClass());
    String openId=(String) map.get("openid");
    return openId;
}

//xml  转json  取prepay_id
private OrderReturnInfo convertXml(String result){
    JSONObject obj = new JSONObject();
    try {
        Document doc = DocumentHelper.parseText(result);
        Element root = doc.getRootElement();
        obj.put(root.getName(), iterateElement(root));
        OrderReturnInfo orderReturnInfo = JSON.toJavaObject(obj.getJSONObject("xml"),OrderReturnInfo.class);
        return orderReturnInfo;
    }catch (Exception e){
            e.printStackTrace();
            return null;
    }

}

@SuppressWarnings("unchecked")
private static Map  iterateElement(Element element) {
    List jiedian = element.elements();
    Element et = null;
    Map obj = new HashMap();
    Object temp;
    List list = null;
    for (int i = 0; i < jiedian.size(); i++) {
        list = new LinkedList();
        et = (Element) jiedian.get(i);
        if (et.getTextTrim().equals("")) {
            if (et.elements().size() == 0)
                continue;
            if (obj.containsKey(et.getName())) {
                temp = obj.get(et.getName());
                if(temp instanceof List){
                    list = (List)temp;
                    list.add(iterateElement(et));
                }else if(temp instanceof Map){
                    list.add((HashMap)temp);
                    list.add(iterateElement(et));
                }else{
                    list.add((String)temp);
                    list.add(iterateElement(et));
                }
                obj.put(et.getName(), list);
            }else{
                obj.put(et.getName(), iterateElement(et));
            }
        } else {
            if (obj.containsKey(et.getName())) {
                temp = obj.get(et.getName());
                if(temp instanceof List){
                    list = (List)temp;
                    list.add(et.getTextTrim());
                }else if(temp instanceof Map){
                    list.add((HashMap)temp);
                    list.add(iterateElement(et));
                }else{
                    list.add((String)temp);
                    list.add(et.getTextTrim());
                }
                obj.put(et.getName(), list);
            }else{
                obj.put(et.getName(), et.getTextTrim());
            }

        }

    }
    return obj;
}

OrderInfo：

/**
 * 预订单
 * 
 * @author zuoliangzhu
 *
 */
public class OrderInfo {
   private String appid;// 小程序ID  
   private String mch_id;// 商户号
   private String nonce_str;// 随机字符串
   private String sign_type;//签名类型
   private String sign;// 签名
   private String body;// 商品描述
   private String out_trade_no;// 商户订单号
   private String  total_fee;// 标价金额 ,单位为分
   private String spbill_create_ip;// 终端IP
   private String notify_url;// 通知地址
   private String trade_type;// 交易类型
   private String openid;//用户标识

}

public class Configure {

   private static String key = "你的商户的api秘钥";


   //商户号
   private static String mch_id = "";
   //

}

Signature：

public class Signature {
   private static final Logger L = Logger.getLogger(Signature.class);
   /**
     * 签名算法
     * @param o 要参与签名的数据对象
     * @return 签名
     * @throws IllegalAccessException
     */
    public static String getSign(Object o) throws IllegalAccessException {
        ArrayList<String> list = new ArrayList<String>();
        Class cls = o.getClass();
        Field[] fields = cls.getDeclaredFields();
        for (Field f : fields) {
            f.setAccessible(true);
            if (f.get(o) != null && f.get(o) != "") {
               String name = f.getName();
               XStreamAlias anno = f.getAnnotation(XStreamAlias.class);
               if(anno != null)
                  name = anno.value();
                list.add(name + "=" + f.get(o) + "&");
            }
        }
        int size = list.size();
        String [] arrayToSort = list.toArray(new String[size]);
        Arrays.sort(arrayToSort, String.CASE_INSENSITIVE_ORDER);
        StringBuilder sb = new StringBuilder();
        for(int i = 0; i < size; i ++) {
            sb.append(arrayToSort[i]);
        }
        String result = sb.toString();
        result += "key=" + Configure.getKey();//后期需要从数据库中取数据
        System.out.println("签名数据："+result);
        result = MD5.MD5Encode(result).toUpperCase();
        return result;
    }

    public static String getSign(Map<String,Object> map){
        ArrayList<String> list = new ArrayList<String>();
        for(Map.Entry<String,Object> entry:map.entrySet()){
            if(entry.getValue()!=""){
                list.add(entry.getKey() + "=" + entry.getValue() + "&");
            }
        }
        int size = list.size();
        String [] arrayToSort = list.toArray(new String[size]);
        Arrays.sort(arrayToSort, String.CASE_INSENSITIVE_ORDER);
        StringBuilder sb = new StringBuilder();
        for(int i = 0; i < size; i ++) {
            sb.append(arrayToSort[i]);
        }
        String result = sb.toString();
        result += "key=" + Configure.getKey();//后期需要从数据库中取数据
        //Util.log("Sign Before MD5:" + result);
        result = MD5.MD5Encode(result).toUpperCase();
        //Util.log("Sign Result:" + result);
        return result;
    }

    

}

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