java加密base64_java 加密算法 base64

绝地灬酷狼 2022-10-23 14:28 58阅读 0赞

(一)java自带的加密和解密

import sun.misc.BASE64Decoder;

public class Base64Utils \{

public static String getBASE64(byte\[\] b) \{

String s = null;

if (b != null) \{

s = new sun.misc.BASE64Encoder().encode(b);

return s;

public static byte\[\] getFromBASE64(String s) \{

byte\[\] b = null;

if (s != null) \{

BASE64Decoder decoder = new BASE64Decoder();

try \{

b = decoder.decodeBuffer(s);

return b;

\} catch (Exception e) \{

e.printStackTrace();

return b;

(二)自己写加密算法

import java.io.UnsupportedEncodingException;

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, 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 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) throws UnsupportedEncodingException \{

StringBuffer sb = new StringBuffer();

byte\[\] 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");

public static void main(String\[\] args) throws UnsupportedEncodingException \{

String s = "abcd";

System.out.println("加密前：" + s);

String x = encode(s.getBytes());

System.out.println("加密后：" + x);

String x1 = new String(decode(x));

System.out.println("解密后：" + x1);

java加密base64_java 加密算法 base64

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