Base64±àÂëÓë½âÂëµÄjavaʵÏÖ
public class Base64 {
//Âë±í
static private char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
.toCharArray();
//codesÀï´æ·ÅµÄÊÇÖµ±í
//¿ÉÒÔÕâôÀí½â¸ù¾ÝÂë±íÖеÄÖµ¿ÉÒԵõ½±àÂëÇ°µÄÖµ
//Èçcodes['A']=0,¼´ÎªÆäË÷ÒýÖµ
static private byte[] codes = new byte[256];
static {
for (int i = 0; i < 256; i++)
codes[i] = -1;
for (int i = 'A'; i <= 'Z'; i++)
codes[i] = (byte) (i - 'A');
for (int i = 'a'; i <= 'z'; i++)
codes[i] = (byte) (26 + i - 'a');
for (int i = '0'; i <= '9'; i++)
codes[i] = (byte) (52 + i - '0');
codes['+'] = 62;
codes['/'] = 63;
}
/**
* ½«ÔʼÊý¾Ý±àÂëΪbase64±àÂë
*/
static public char[] encode(byte[] data) {
//¶ÔÓÚÔÎĵÄ×Ö½ÚÊýÁ¿ÊÇ3µÄ±¶ÊýµÄʱºò,ת»»ºóµÄ×Ö·û´®ÀíÂÛÉϽ«Òª±ÈÔÀ´µÄ³¤1/3,¼´ÔÀ´µÄ4/3.
//µ±ÔÎĵÄ×Ö½ÚÊý²»ÊÇ3µÄ±¶ÊýµÄʱºò,²»×ãµÄµØ·½ÎÒÃDz¹È«.
//¹ÊÔÎIJ¹È«ºóµÄ×î´ó³¤¶ÈΪ Ô×Ö·û´®³¤¶È+2
//±àÂëºóµÄ³¤¶ÈΪ(Ô×Ö·û´®³¤¶È+2)*3/4
char[] out = new char[((data.length + 2) / 3) * 4];
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