记一次微信支付的坑-1

一直返回-1

1 包名一定要和平台上的一致

2签名改成小写

3 怀疑返回的sign不对，自己本地签名，果然是返回的sign不对

WXPayRegister(mContext);
req = new PayReq();
req.appId = json.optString("appid");
req.partnerId = json.optString("partnerid");
req.prepayId = json.optString("prepayid");
req.nonceStr = json.optString("noncestr");
req.timeStamp = json.optString("timestamp");
req.packageValue = json.optString("package");
req.sign = json.optString("sign");
req.extData = "app data"; // optional

   //自己签名
//                        StringBuffer weiXinVo=new StringBuffer();
//                        SortedMap<String, String> signParam = new TreeMap<String, String>();
//                        signParam.put("appid",  req.appId);//app_id
//                        signParam.put("partnerid", req.partnerId);//微信商户账号
//                        signParam.put("prepayid", req.prepayId);//预付订单id
//                        signParam.put("package", req.packageValue);//默认sign=WXPay
//                        signParam.put("noncestr", req.nonceStr);//自定义不重复的长度不长于32位
//                        signParam.put("timestamp",req.timeStamp);//北京时间时间戳
//                        String signAgain = createSign("UTF-8", signParam);//再次生成签名
//                        signParam.put("sign", signAgain);
//                        Log.e("roach", "run: "+signAgain );
//                        req.sign = signAgain;

//定义签名，微信根据参数字段的ASCII码值进行排序 加密签名,故使用SortMap进行参数排序
public static String createSign(String characterEncoding,SortedMap<String,String> parameters) {
    StringBuffer sb = new StringBuffer();
    Set es = parameters.entrySet();
    Iterator it = es.iterator();
    while (it.hasNext()) {
        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=" + "42903cbd6b1ca3ed0e9811cb07822ac3");//最后加密时添加商户密钥，由于key值放在最后，所以不用添加到SortMap里面去，单独处理，编码方式采用UTF-8
    String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();
    return sign;
}

import java.security.MessageDigest;

/**
 * 作者：Administrator on 2017/12/20 09:45
 * 邮箱：android_gaoxuge@163.com
 */
public class MD5Util {
    private static String byteArrayToHexString(byte b[]) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++)
            resultSb.append(byteToHexString(b[i]));

        return resultSb.toString();
    }

    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    public static String MD5Encode(String origin, String charsetname) {
        String resultString = null;
        try {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (charsetname == null || "".equals(charsetname))
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes()));
            else
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes(charsetname)));
        } catch (Exception exception) {
        }
        return resultString;
    }

    private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
}