Java COMPUTE file MD5

public class Md5check {/** * default password string combination, used to convert bytes to 16 binary representation of the character, Apache verify the correctness of the downloaded file is the default combination of this */protected char hexdigits[     ] = {' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ', ' 6 ', ' 7 ', ' 8 ', ' 9 ', ' A ', ' B ', ' C ', ' d ', ' e ', ' f '}; protected MessageDigest messagedigest = null;

    {        try {             messagedigest = messagedigest.getinstance ("MD5");         catch (NoSuchAlgorithmException e) {             E.printstacktrace ();        }    }     public String getfilemd5string ( File file) throws IOException {        InputStream fis;     & nbsp;   fis = new FileInputStream (file);         byte[] buffer = new byte[1024];         int numread = 0;         while ((Numread = fis.read (buffer)) > 0) {             messagedigest.update (buffer, 0, numread);        }         fis.close ();         return Buffertohex (Messagedigest.digest ());    }

    public String getfilemd5string (InputStream in) throws IOException {     & nbsp;  byte[] buffer = new byte[1024];         int numread = 0;         while ((Numread = in.read (buffer)) > 0) {             messagedigest.update (buffer, 0, numread);        }         in.close ();         return Buffertohex (Messagedigest.digest ());    }     Private String Buffertohex (byte bytes[]) {         return Buffertohex (bytes, 0, bytes.length);    }     Private String Buffertohex (byte bytes[], int m, int n) {    & nbsp;   StringBuffer stringbuffer = new StringBuffer (2 * n);         int k = m + N;         for (int l = m; l < K; l++) {&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NB sp;    Appendhexpair (Bytes[l], stringbuffer);        }         return Stringbuffer.tostring ();    }     private void Appendhexpair (Byte bt, StringBuffer StringBuffer) {  & nbsp;     char C0 = hexdigits[(BT & 0xf0) >> 4];//take byte high 4-bit digital conversion &NBSP;&NBSP;&NBSP;&NBSP;&N bsp;  //For logical right SHIFT, move the sign bit right together, there is no difference between the two symbols found here         char C1 = HEXDIGITS[BT & 0xf];//4-bit digital conversion         stringbuffer.append (C0) in bytes;         Stringbuffer.append (C1);    }}

Java COMPUTE file MD5