MD5加密算法

 
 
import java.security.*;
import java.security.spec.*;
class MD5_Test...{
   
    public final static String MD5(String s)...{
        char hexDigits[] = ...{''0'', ''1'', ''2'', ''3'', ''4'', ''5'', ''6'', ''7'', ''8'', ''9'', ''a'', ''b'', ''c'', ''d'',''e'', ''f''};
        try
        ...{
            byte[] strTemp = s.getBytes();
            MessageDigest mdTemp = MessageDigest.getInstance("MD5");
            mdTemp.update(strTemp);
            byte[] md = mdTemp.digest();
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++)
            ...{
                byte byte0 = md;
                str[k++] = hexDigits[byte0 >>>4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        }
        catch (Exception e)
        ...{
            return null;
        }
    }
}