/**

  * 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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