Base64Encoder
public class Base64Encoder { private final static char[] ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray(); private static int[] toInt = new int[128]; static { for (int i = 0; i < ALPHABET.length; i++) { toInt[ALPHABET[i]] = i; } } /** * Translates the specified byte array into Base64 string. * * @param buf the byte array (not null) * @return the translated Base64 string (not null) */ public static String encode(byte[] buf) { int size = buf.length; char[] ar = new char[((size + 2) / 3) * 4]; int a = 0; int i = 0; while (i < size) { byte b0 = buf[i++]; byte b1 = (i < size) ? buf[i++] : 0; byte b2 = (i < size) ? buf[i++] : 0; int mask = 0x3F; ar[a++] = ALPHABET[(b0 >> 2) & mask]; ar[a++] = ALPHABET[((b0 << 4) | ((b1 & 0xFF) >> 4)) & mask]; ar[a++] = ALPHABET[((b1 << 2) | ((b2 & 0xFF) >> 6)) & mask]; ar[a++] = ALPHABET[b2 & mask]; } switch (size % 3) { case 1: ar[--a] = '='; case 2: ar[--a] = '='; } return new String(ar); } }