接口签名：参数名按ASCII码从小到大排序+Key+MD5+转大写签名

/*** sign 签名 （参数名按ASCII码从小到大排序（字典序）+key+MD5+转大写签名）* key 由供应商提供* @return*/publicstaticStringgetSign(Mapmap, StringappSecret) throwsNoSuchAlgorithmException {
StringBuffersignOri=newStringBuffer();
// entrySet 所有参与传参的参数按照accsii排序（升序）Setset=map.entrySet();
Iteratorit=set .iterator();
while (it.hasNext()) {
Map.Entryentry= (Map.Entry) it.next();
Stringk= (String) entry.getKey();
Objectv=entry.getValue();
//空值不传递，不参与签名组串if (null!=v&&!"".equals(v)) {
signOri.append(k+"="+v+"&");
            }
        }
signOri=signOri.append("appSecret="+appSecret);
System.out.println(signOri);
//MD5加密,结果转换为大写字符Stringsign=encodeByMD5(signOri.toString()).toUpperCase();
returnsign;
    }
publicstaticStringencodeByMD5(Stringstr) throwsNoSuchAlgorithmException {
MessageDigestmd=MessageDigest.getInstance("MD5");
// 计算消息的摘要byte[] digest=md.digest(str.getBytes());
// 将摘要转换为十六进制字符串StringhexString=bytesToHex(digest);
returnhexString;
    }
publicstaticStringbytesToHex(byte[] bytes) {
StringBuilderhexString=newStringBuilder();
for (byteb : bytes) {
Stringhex=Integer.toHexString(0xff&b);
if (hex.length() ==1) {
hexString.append('0');
            }
hexString.append(hex);
        }
returnhexString.toString();
    }