Android微信支付获取二次签名Sign的方法

Posted 2022-12-02 志向远大

    /**
     * 获取sign签名
     * 
     * @return
     */
    private String genPayReq() 

        // 获取参数的值
        PayReq request = new PayReq();
        request.appId = ConstantsMember.APP_ID;
        request.partnerId = ConstantsMember.MCHID;
        request.prepayId = mPrepayId;
        request.packageValue = "Sign=WXPay";
        request.nonceStr = DataUtil.getGuid();
        request.timeStamp = DataUtil.getTimeStamp();

        // 把参数的值传进去SortedMap集合里面
        SortedMap<Object, Object> parameters = new TreeMap<Object, Object>();
//      appid=wx34df375d7dae8c90, noncestr=3BF34EF2CA4A462DB8D4EA48E785CDC3, 
//              package=Sign=WXPay, partnerid=1349967601, 
//              prepayid=wx2016070910354542c7155d4e0846850809, timestamp=1468031760
        parameters.put("appid", request.appId);
        parameters.put("noncestr", request.nonceStr);
        parameters.put("package", request.packageValue);
        parameters.put("partnerid", request.partnerId);
        parameters.put("prepayid", request.prepayId);
        parameters.put("timestamp", request.timeStamp);

        String characterEncoding = "UTF-8";
        String mySign = createSign(characterEncoding, parameters);
        System.out.println("我的签名是：" + mySign);
        return mySign;
    

    /**
     * 微信支付签名算法sign
     * 
     * @param characterEncoding
     * @param parameters
     * @return
     */
    public static String createSign(String characterEncoding,
            SortedMap<Object, Object> parameters) 

        StringBuffer sb = new StringBuffer();
        Set es = parameters.entrySet();// 所有参与传参的参数按照accsii排序（升序）
        Iterator it = es.iterator();
        while (it.hasNext()) 
            @SuppressWarnings("rawtypes")
            Map.Entry entry = (Map.Entry) it.next();
            String k = (String) entry.getKey();
            Object v = entry.getValue();
            if (null != v && !"".equals(v) && !"sign".equals(k)
                    && !"key".equals(k)) 
                sb.append(k + "=" + v + "&");
            
        
        sb.append("key=" + ConstantsMember.KEY); //KEY是商户秘钥
        String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding)
                .toUpperCase();
        return sign; // D3A5D13E7838E1D453F4F2EA526C4766
                        // D3A5D13E7838E1D453F4F2EA526C4766