微信支付第二次加簽參數
appid partnerid prepayid noncestr timestamp package
package爲固定值 Sign=WXPay timestamp 爲十位時間戳 其他參數爲統一下單時返回的參數
這裏使用的事MD5加密 需要與統一下單時的參數一致
SortedMap<Object, Object> sortedMap = new TreeMap<>();
sortedMap.put("appid",(String)map.get("appid"));
sortedMap.put("partnerid",(String)map.get("mch_id"));
sortedMap.put("prepayid",(String)map.get("prepay_id"));
sortedMap.put("noncestr",(String)map.get("nonce_str"));
sortedMap.put("timestamp",time.toString());
sortedMap.put("package","Sign=WXPay");
String sign = PayCommonUtil.createSign("UTF-8", sortedMap, key);
PayCommonUtil類
public static String createSign(String characterEncoding, SortedMap<Object, Object>
packageParams, String API_KEY) {
StringBuffer sb = new StringBuffer();
Set es = packageParams.entrySet();
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
String v = (String) entry.getValue();
if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) {
sb.append(k + "=" + v + "&");
}
}
sb.append("key=" + API_KEY);
String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();
return sign;
}
MD5Util 加密工具類
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" };
}