Java自带的Base64算法
public void myBase64() {
try {
BASE64Encoder encoder = new BASE64Encoder();
String encode = encoder.encode(src.getBytes());
System.out.println("encode: " + encode);
BASE64Decoder decoder = new BASE64Decoder();
String decode = new String(decoder.decodeBuffer(encode));
System.out.println("decode: " + decode);
} catch (IOException e) {
e.printStackTrace();
}
}
commons-codec的Base64算法
引入commons-codec-1.10.jar
public void commonCodeBase64() {
byte[] encodeBytes = Base64.encodeBase64(src.getBytes());
System.out.println("encode: " + new String(encodeBytes));
byte[] decodeBytes = Base64.decodeBase64(encodeBytes);
System.out.println("decode: " + new String(decodeBytes));
}
bouncycastle的Base64算法
引入bcprov-jdk15on-154.jar
public void bouncyCodeBase64() {
byte[] encodeBytes = org.bouncycastle.util.encoders.Base64.encode(src.getBytes());
System.out.println("encode: " + new String(encodeBytes));
byte[] decodeBytes = org.bouncycastle.util.encoders.Base64.decode(encodeBytes);
System.out.println("decode: " + new String(decodeBytes));
}
自定义的base64算法
public class HuhxBase64 {
private static final String CODES = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
// base64解密
private static byte[] base64Decode(String input) {
if (input.length() % 4 != 0) {
throw new IllegalArgumentException("Invalid base64 input");
}
byte decoded[] = new byte[((input.length() * 3) / 4) - (input.indexOf('=') > 0 ? (input.length() - input.indexOf('=')) : 0)];
char[] inChars = input.toCharArray();
int j = 0;
int b[] = new int[4];
for (int i = 0; i < inChars.length; i += 4) {
// This could be made faster (but more complicated) by precomputing
// these index locations.
b[0] = CODES.indexOf(inChars[i]);
b[1] = CODES.indexOf(inChars[i + 1]);
b[2] = CODES.indexOf(inChars[i + 2]);
b[3] = CODES.indexOf(inChars[i + 3]);
decoded[j++] = (byte) ((b[0] << 2) | (b[1] >> 4));
if (b[2] < 64) {
decoded[j++] = (byte) ((b[1] << 4) | (b[2] >> 2));
if (b[3] < 64) {
decoded[j++] = (byte) ((b[2] << 6) | b[3]);
}
}
}
return decoded;
}
// base64加密
private static String base64Encode(byte[] in) {
StringBuilder out = new StringBuilder((in.length * 4) / 3);
int b;
for (int i = 0; i < in.length; i += 3) {
b = (in[i] & 0xFC) >> 2;
out.append(CODES.charAt(b));
b = (in[i] & 0x03) << 4;
if (i + 1 < in.length) {
b |= (in[i + 1] & 0xF0) >> 4;
out.append(CODES.charAt(b));
b = (in[i + 1] & 0x0F) << 2;
if (i + 2 < in.length) {
b |= (in[i + 2] & 0xC0) >> 6;
out.append(CODES.charAt(b));
b = in[i + 2] & 0x3F;
out.append(CODES.charAt(b));
} else {
out.append(CODES.charAt(b));
out.append('=');
}
} else {
out.append(CODES.charAt(b));
out.append("==");
}
}
return out.toString();
}
public static void main(String[] args) {
String input = "I love you, huhx!";
String encode = base64Encode(input.getBytes());
System.out.println("encode: " + encode);
String decode = new String(base64Decode(encode));
System.out.println("decode: " + decode);
}
}