MD5 Tool class, provides string MD5 encryption, file MD5 value acquisition (checksum) function

MD5 Tool class, provides string MD5 encryption (checksum), file MD5 value acquisition (checksum) function:

 Packagecom.yzu.utils;ImportJava.io.File;ImportJava.io.FileInputStream;Importjava.io.IOException;ImportJava.nio.ByteBuffer;ImportJava.nio.channels.FileChannel;Importjava.security.MessageDigest;Importjava.security.NoSuchAlgorithmException;Importorg.apache.commons.io.IOUtils;/*** MD5 Tool class, provides string MD5 encryption (checksum), file MD5 value acquisition (checksum) function*/ Public classMd5utils {/*** 16 binary Character Set*/    Private Static Final Char[] hex_digits = {' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ', ' 6 ', ' 7 ', ' 8 ', ' 9 ', ' A ', ' B ', ' C ', ' D ', ' E ', ' F ' }; /*** Specify the algorithm for MD5 messagedigest*/    Private StaticMessageDigest messagedigest =NULL; /*** Initialize the MessageDigest encryption algorithm to MD5*/    Static {        Try{messagedigest= Messagedigest.getinstance ("MD5"); } Catch(nosuchalgorithmexception e) {e.printstacktrace (); }    }    /*** Get the MD5 value of the file * *@paramfile * Target files *@returnMD5 String*/     Public Staticstring getfilemd5string (file file) {string ret= ""; FileInputStream in=NULL; FileChannel CH=NULL; Try{ in=Newfileinputstream (file); CH=In.getchannel (); Bytebuffer Bytebuffer= Ch.map (FileChannel.MapMode.READ_ONLY, 0, File.length ());            Messagedigest.update (Bytebuffer); RET=Bytestohex (Messagedigest.digest ()); } Catch(IOException e) {e.printstacktrace (); } finally{ioutils.closequietly (ch, in); }        returnret; }    /*** * Get the MD5 value of the file * *@paramFileName * Full name of the target file *@returnMD5 String*/     Public Staticstring getfilemd5string (String fileName) {returnGetfilemd5string (NewFile (fileName)); }    /*** * MD5 Encrypted String * *@paramSTR * Target String *@returnMD5 the encrypted string*/     Public Staticstring getmd5string (String str) {returngetmd5string (Str.getbytes ()); }    /*** * MD5 encrypts the string represented in a byte array * *@parambytes * Target byte array *@returnMD5 the encrypted string*/     Public StaticString getmd5string (byte[] bytes)        {messagedigest.update (bytes); returnBytestohex (Messagedigest.digest ()); }    /*** * Verify that the password is consistent with its MD5 * *@parampwd * Password String *@paramMD5 * Benchmark MD5 value *@returnTest Results*/     Public Static BooleanCheckpassword (string pwd, string md5) {returngetmd5string (PWD). Equalsignorecase (MD5); }    /*** * Verify that the password is consistent with its MD5 * *@parampwd * Password represented as a character array *@paramMD5 * Benchmark MD5 value *@returnTest Results*/     Public Static BooleanCheckpassword (Char[] pwd, String MD5) {        returnCheckpassword (NewString (PWD), MD5); }    /*** * MD5 value of the test file * *@paramfile * Target files * *@paramMD5 * Benchmark MD5 value * *@returnTest Results **/     Public Static BooleancheckFileMD5 (file file, String MD5) {returngetfilemd5string (file). equalsignorecase (MD5); }    /*** * MD5 value of the test file * *@paramFileName * Full name of the target file * *@paramMD5 * Benchmark MD5 value * *@returnTest Results **/     Public Static BooleancheckFileMD5 (String fileName, string md5) {returnCheckFileMD5 (NewFile (fileName), MD5); }    /*** * convert byte array to 16 binary string * *@parambytes * Destination byte array * *@returnConversion Results **/     Public StaticString Bytestohex (bytebytes[]) {        returnBytestohex (Bytes, 0, bytes.length); }    /*** * Converts a subarray of a specified interval in a byte array into a 16-character string *@parambytes * Destination byte array * *@paramstart * Start position (including the position) * *@paramEnd * Ending position (excluding this position) *@returnConversion Results **/     Public StaticString Bytestohex (byteBytes[],intStartintend) {StringBuilder SB=NewStringBuilder ();  for(inti = start; I < start + end; i++) {sb.append (Bytetohex (bytes[i)); }        returnsb.tostring (); }    /*** Double-layer Encrypted MD5 value *@paramstrsrc*/     Public Staticstring getSimenMD5 (String strsrc) {string str1=getmd5string (STRSRC). toLowerCase (); StringBuffer str2=NewStringBuffer (""); Str2.append (Str1.substring (0, 2)). Append ("|").). Append (Str1.substring (4). Append ("|").). Append (Str1.substring (8). Append ("|").). Append (Str1.substring (). Append ("|").). Append (Str1.substring (1, 9)). Append ("|").). Append (Str1.substring (24, 27)); returngetmd5string (str2.tostring ()); }    /*** Converts a single bytecode into a 16 string *@paramBT * Target byte *@returnConversion Results*/     Public StaticString Bytetohex (byteBT) {        returnHex_digits[(BT & 0XF0) >> 4] + "" + HEX_DIGITS[BT & 0xf]; }         Public Static voidMain (string[] args)throwsIOException {String fileName= "D:/javawed/debug.js"; String MD5= Getfilemd5string (NewFile (fileName)); System.out.println (FileName+ "file MD5:" +MD5); System.out.println (GetSimenMD5 ("123456")); }}

MD5 Tool class, provides string MD5 encryption, file MD5 value acquisition (checksum) function