Base64Utils 在Java后台的扩展

来源：互联网发布：进口商品条码查询软件编辑：程序博客网时间：2024/04/28 22:28
/** * Created by ruiyi on 2016/4/27. */public class Base64Util {    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};    /**     * 加密     *     * @param data     * @return     */    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();    }    /**     * 解密     *     * @param str     * @return     */    public static byte[] decode(String str) {        try {            return decodePrivate(str);        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        }        return new byte[]                {};    }    private static byte[] decodePrivate(String str) throws UnsupportedEncodingException {        StringBuffer sb = new StringBuffer();        byte[] data = null;        data = str.getBytes("US-ASCII");        int len = data.length;        int i = 0;        int b1, b2, b3, b4;        while (i < len) {            do {                b1 = base64DecodeChars[data[i++]];            } while (i < len && b1 == -1);            if (b1 == -1)                break;            do {                b2 = base64DecodeChars[data[i++]];            } while (i < len && b2 == -1);            if (b2 == -1)                break;            sb.append((char) ((b1 << 2) | ((b2 & 0x30) >>> 4)));            do {                b3 = data[i++];                if (b3 == 61)                    return sb.toString().getBytes("iso8859-1");                b3 = base64DecodeChars[b3];            } while (i < len && b3 == -1);            if (b3 == -1)                break;            sb.append((char) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));            do {                b4 = data[i++];                if (b4 == 61)                    return sb.toString().getBytes("iso8859-1");                b4 = base64DecodeChars[b4];            } while (i < len && b4 == -1);            if (b4 == -1)                break;            sb.append((char) (((b3 & 0x03) << 6) | b4));        }        return sb.toString().getBytes("iso8859-1");    }}
就这样
0 0