/**?
*? SHA 1？ Security encryption algorithm?
*? @param？ Map? Parameter key value mapping set?
*? @ Return?
*? @throws？ DigestException？
*/?
Public? Static electricity String? SHA 1 (map < string, object >? Map)? Throwing? DigestException？ {?
//Get information summary? -? Parameter dictionary sort string?
String? Decryption? =? GetOrderByLexicographic (map); ?
Try it? {?
//specify sha 1 algorithm?
MessageDigest？ Digestion? =? message digest . getinstance(" SHA- 1 ")； ?
digest . update(decrypt . getbytes())； ?
//Get byte array?
Bytes? Message summary []? =? digest . digest()； ?
//? Create? Black magic? String?
StringBuffer？ hexString？ =? New? string buffer()； ?
//? Byte array converted to? Hexadecimal counting
For what? (int？ Me? =? 0; ? Me? & lt？ messageDigest.length？ i++)？ {?
String? shaHex？ =? integer . tohexstring(message digest[I]？ & amp？ 0x ff)； ?
What if? (shaHex.length()？ & lt？ 2)? {?
hex string . append(0)； ?
}?
hex string . append(shaHex)； ?
}?
Return? hexString.toString()。 toupper case()； ?
}? Catch? (NoSuchAlgorithmException？ e)？ {?
e . printstacktrace()； ?
Throw? New? DigestException ("Wrong signature!" ); ?
}?
}?
/**?
*? Get the parameters of dictionary sorting?
*? @param？ Map? Parameter key value mapping set?
*? @ Return? String? Sort string?
*/?
Private? Static electricity String? GetOrderByLexicographic (map< string, object & gt? Map) {?
Return? split params(lexico graphic recorder(getParamsName(maps))，maps)； ?
}?
/**?
*? Get the parameter name? Keys?
*? @param？ Map? Parameter key value mapping set?
*? @ Return?
*/?
Private? Static electricity List & lt string & gt? getParamsName(Map & lt； String, object >? Map) {?
List & lt string & gt? paramNames？ =? New? ArrayList & lt string & gt (); ?
For (figure. Entry & lt string, object & gt? Getting started? :? maps.entrySet()){？
param names . add(entry . getkey())； ?
}?
Return? paramNames？
}?
/**?
*? Parameter names sorted by dictionary?
*? @param？ paramNames？ Parameter name list set?
*? @ Return? List a set of sorted parameter names?
*/?
Private? Static electricity List & lt string & gt? Dictionary recorder (List & lt string & gt? paramNames){？
collections . sort(param names)； ?
Return? paramNames？
}?
/**?
*? Parameter names and values after splicing and sorting?
*? @param？ paramNames？ Sorted set of parameter names?
*? @param？ Map? Parameter key value mapping set?
*? @ Return? String? Spliced strings?
*/?
Private? Static electricity String? split params(List & lt； String & gt? ParamNames, Map< string, object & gt? Map) {?
StringBuilder？ paramStr？ =? New? StringBuilder()； ?
For (string? paramName？ :? paramNames){？
paramstr . append(param name)； ?
For (figure. Entry & lt string, object & gt? Getting started? :? maps.entrySet()){？
if(param name . equals(entry . getkey()){？
paramstr . append(string . value of(entry . getvalue()))； ?
}?
}?
}?
Return? paramstr . tostring()； ?
}