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packageParams.put("appid", appid);
packageParams.put("mch_id", mch_id);
packageParams.put("nonce_str", nonce_str);
packageParams.put("body", body);
packageParams.put("attach", attach);
packageParams.put("out_trade_no", out_trade_no);
packageParams.put("total_fee", totalFee);
packageParams.put("spbill_create_ip", spbill_create_ip);
packageParams.put("notify_url", notify_url);
packageParams.put("trade_type", trade_type);
RequestHandler reqHandler = new RequestHandler(null, null);
reqHandler.init(appid, appsecret, partnerkey);
String sign = reqHandler.createSign(packageParams);
if (!sub_mch_id.equals(""))
packageParams.put("sub_mch_id", sub_mch_id);//这个放在sign签名也没用;;
...