Android微信支付获取二次签名Sign的方法

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    /**     * 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    }
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