微信跨公众号支付-蒲公英云

先说下我的需求。我有两个公众号（不是订阅号，订阅号无法向公众号支付）分别为A和B，现在我关注公众号A，在公众号A中需要发起公众号B的支付，也就是说我在公众号A中向公众号B支付钱（用户未关注B公众号）。

一、在公众号B中配置测试授权目录

Center

二、使用微信OAuth2.0授权公众号B获取B公众号openId

/**
     * 微信授权获取code
     * @param response
     * @throws IOException
     */
    @RequestMapping(value = "/getCode", produces = {"application/json;charset=UTF-8"}, method = RequestMethod.GET)
    public void getCode(HttpServletResponse response) throws IOException {
        response.sendRedirect(getCodeRequest());
    }
    public static String  GetCodeRequest = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect";
    public static String getCodeRequest(){
        String result = null;
        GetCodeRequest  = GetCodeRequest.replace("APPID", urlEnodeUTF8(WxpayConfig.appid));
        //授权回调地址weixin/t1/callBack处理code获取openId
        GetCodeRequest  = GetCodeRequest.replace("REDIRECT_URI",urlEnodeUTF8("http://xxxxxx/weixin/t1/callBack"));
        //不弹出微信授权页面：scope=snsapi_base，弹出微信授权页面：scope=snsapi_userinfo
        GetCodeRequest = GetCodeRequest.replace("SCOPE", "snsapi_base");
        result = GetCodeRequest;
        return result;
    }

三、授权完成,授权回调函数获取code和openId

/**
    微信授权回调
     **/
    @RequestMapping(value = "/callBack", produces = {"application/json;charset=UTF-8"}, method = RequestMethod.GET)
    public String callBack(HttpServletRequest request) throws IOException {
        //獲取code
        String code = request.getParameter("code");
        String url = String.format(Constant.OPENID_RETREIVAL_URL, WxpayConfig.appid, WxpayConfig.appsecret, code);
        //获取openId信息
        JSONObject jsonObject = WeixinUtil.httpsRequest(url, "GET", null);
        if (jsonObject != null) {
            try {
                OpenIdBean openIdBean = (OpenIdBean) JSONObject.toBean(jsonObject, OpenIdBean.class);
                request.setAttribute("openId",openIdBean.getOpenid());
            }catch (Exception e) {
                e.printStackTrace();
            }
        }
        //跳转到发起支付的页面
        return "weixin/test/index2";
    }

至此已经在A公众号中完全获取了B公众号的OpenId下面就可以进行支付了。

附index2页面

四、统一下单进行支付

//公众号支付
    @RequestMapping(value = "/unifiedorder_jsapi", produces = {"application/json;charset=UTF-8"}, method = RequestMethod.GET)
    @ResponseBody
    public Object native_unifiedOrder2(HttpServletRequest request){
        //终端设备号(门店号或收银设备ID)，注意：PC网页或公众号内支付请传"WEB"
        String device_info = "WEB";
        //随机字符串，不长于32位
        String nonce_str = UUID.randomUUID().toString().replace("-","");
        //商品或支付单简要描述
        //String body = request.getParameter("body");
        //商品名称明细列表
        String detail = request.getParameter("detail");
        //商户系统内部的订单号
        String orderNos = request.getParameter("orderNos");
        //APP和网页支付提交用户端ip，Native支付填调用微信支付API的机器IP
        String spbill_create_ip = request.getParameter("spbill_create_ip");
        //交易类型 取值如下：JSAPI--公众号支付，NATIVE:扫码支付，APP
        String trade_type = "JSAPI";
        //用户openid
        String openid = request.getParameter("openId");
        //组装请求数据
        TreeMap<String, String> treeMap = new TreeMap<String, String>();
        treeMap.put("appid",WxpayConfig.appid);
        treeMap.put("mch_id", WxpayConfig.mch_id);
        treeMap.put("nonce_str", nonce_str);
        treeMap.put("notify_url",WxpayConfig.notify_url);
        treeMap.put("device_info",device_info);
        treeMap.put("body","asadsd");
        treeMap.put("detail","ssss");
        treeMap.put("spbill_create_ip","192.167.0.12");
        treeMap.put("trade_type", trade_type);
        treeMap.put("openid",openid);
        Map resMap = new HashMap();
        //创建TradingOrder订单与支付单关系表
        String out_trade_no = UUID.randomUUID().toString().replace("-", "");
        //转换订单号，主要是为了应对多单合并支付
        treeMap.put("out_trade_no", out_trade_no);
        //计算订单的实际支付金额
        //订单总金额，单位为分
        //付款金额必须为整数 不允许有小数点
        treeMap.put("total_fee", "1");
        String xml = WxUtil.getPackage(treeMap);
        // 创建HttpClientBuilder
        HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
        CloseableHttpClient closeableHttpClient = httpClientBuilder.build();
        HttpPost httpPost = new HttpPost(WxpayConfig.unifiedorder);
        StringEntity entity;
        //预支付id
        String prepay_id ="";
        //当trade_type为NATIVE获取扫码支付连接
        String code_url = "";
        try {
            entity = new StringEntity(xml, "utf-8");
            httpPost.setEntity(entity);
            CloseableHttpResponse httpResponse;
            // post请求
            httpResponse = closeableHttpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            if (httpEntity != null) {
                // 打印响应内容
                String result = EntityUtils.toString(httpEntity, "UTF-8");
                // 过滤
                result = result.replaceAll("<![CDATA[|]]>", "");
                Map<String, String> map = XMLUtil.doXMLParse(result);
                if(map != null){
                    prepay_id  = (String) map.get("prepay_id");
                }
            }
            // 释放资源
            closeableHttpClient.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        //获取prepay_id后，拼接最后请求支付所需要的package
        if(prepay_id == null || "".equals(prepay_id)  ){//请求数据出错
            resMap.put("payMsg",new HashMap());
        }else {
            TreeMap<String, String> finalpackage = new TreeMap<String, String>();
            String timestamp = WxUtil.getTimeStamp();
            String packages = "prepay_id="+prepay_id;
            finalpackage.put("appId", WxpayConfig.appid);
            finalpackage.put("timeStamp", timestamp);
            finalpackage.put("nonceStr", nonce_str);
            finalpackage.put("package", packages);
            finalpackage.put("signType", "MD5");
            String paySign = WxUtil.createSign(finalpackage);
            finalpackage.put("paySign",paySign);
            resMap.put("payMsg", finalpackage);
        }
        //请求数据无误，可生成预支付订单写入数据库
        return resMap;
    }