Java Base64加密解码实例

import java.io.ByteArrayOutputStream;


public class Base64
{
private static char[] base64EncodeChars = new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' };


private static byte[] base64DecodeChars = new byte[] { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55,
56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46,
47, 48, 49, 50, 51, -1, -1, -1, -1, -1 };


public Base64()
{
}


public static String encode(byte[] data)
{
StringBuffer sb = new StringBuffer();
int len = data.length;
int i = 0;
int b1, b2, b3;


while (i < len)
{
b1 = data[i++] & 0xff;
if (i == len)
{
sb.append(base64EncodeChars[b1 >>> 2]);
sb.append(base64EncodeChars[(b1 & 0x3) << 4]);
sb.append("==");
break;
}
b2 = data[i++] & 0xff;
if (i == len)
{
sb.append(base64EncodeChars[b1 >>> 2]);
sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);
sb.append(base64EncodeChars[(b2 & 0x0f) << 2]);
sb.append("=");
break;
}
b3 = data[i++] & 0xff;
sb.append(base64EncodeChars[b1 >>> 2]);
sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);
sb.append(base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >>> 6)]);
sb.append(base64EncodeChars[b3 & 0x3f]);
}
return sb.toString();
}


public static byte[] decode(String str)
{
byte[] data = str.getBytes();
int len = data.length;
ByteArrayOutputStream buf = new ByteArrayOutputStream(len);
int i = 0;
int b1, b2, b3, b4;


while (i < len)
{


/* b1 */
do
{
b1 = base64DecodeChars[data[i++]];
}
while (i < len && b1 == -1);
if (b1 == -1)
{
break;
}


/* b2 */
do
{
b2 = base64DecodeChars[data[i++]];
}
while (i < len && b2 == -1);
if (b2 == -1)
{
break;
}
buf.write((int) ((b1 << 2) | ((b2 & 0x30) >>> 4)));


/* b3 */
do
{
b3 = data[i++];
if (b3 == 61)
{
return buf.toByteArray();
}
b3 = base64DecodeChars[b3];
}
while (i < len && b3 == -1);
if (b3 == -1)
{
break;
}
buf.write((int) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));


/* b4 */
do
{
b4 = data[i++];
if (b4 == 61)
{
return buf.toByteArray();
}
b4 = base64DecodeChars[b4];
}
while (i < len && b4 == -1);
if (b4 == -1)
{
break;
}
buf.write((int) (((b3 & 0x03) << 6) | b4));
}
return buf.toByteArray();
}


public static void main(String[] args)
{
Base64 base64 = new Base64();

String testStr = "{\"name\":\"vicken\",\"age\":20}";
System.out.println("加密前：" + testStr);

String encodeStr = base64.encode(testStr.getBytes());
System.out.println("加密数据：" + encodeStr);

byte[] decodeStr = base64.decode(encodeStr);
System.out.println("解密数据：" + new String(decodeStr));
}
}