代码语言：javascript复制
/**
* 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
} 
