Base64编码
private static char[] encodes = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
.toCharArray();
private static byte[] decodes = new byte[256];
static {
for (int i = 0; i < encodes.length; i++) {
decodes[encodes[i]] = (byte) i;
}
}
public static StringBuffer encodeBase64(byte[] data) {
StringBuffer sb = new StringBuffer(data.length * 2);
int pos = 0, val = 0;
for (int i = 0; i < data.length; i++) {
val = (val << 8) | (data[i] & 0xFF);
pos += 8;
while (pos > 5) {
sb.append(encodes[val >> (pos -= 6)]);
val &= ((1 << pos) - 1);
}
}
if (pos > 0) {
sb.append(encodes[val << (6 - pos)]);
}
return sb;
}
public static byte[] decodeBase64(char[] data) {
ByteArrayOutputStream baos = new ByteArrayOutputStream(data.length);
int pos = 0, val = 0;
for (int i = 0; i < data.length; i++) {
val = (val << 6) | decodes[data[i]];
pos += 6;
while (pos > 7) {
baos.write(val >> (pos -= 8));
val &= ((1 << pos) - 1);
}
}
return baos.toByteArray();
}
Base62编码
public static StringBuffer encodeBase62(byte[] data) {
StringBuffer sb = new StringBuffer(data.length * 2);
int pos = 0, val = 0;
for (int i = 0; i < data.length; i++) {
val = (val << 8) | (data[i] & 0xFF);
pos += 8;
while (pos > 5) {
char c = encodes[val >> (pos -= 6)];
sb.append(
/**/c == 'i' ? "ia" :
/**/c == '+' ? "ib" :
/**/c == '/' ? "ic" : c);
val &= ((1 << pos) - 1);
}
}
if (pos > 0) {
char c = encodes[val << (6 - pos)];
sb.append(
/**/c == 'i' ? "ia" :
/**/c == '+' ? "ib" :
/**/c == '/' ? "ic" : c);
}
return sb;
}
public static byte[] decodeBase62(char[] data) {
ByteArrayOutputStream baos = new ByteArrayOutputStream(data.length);
int pos = 0, val = 0;
for (int i = 0; i < data.length; i++) {
char c = data[i];
if (c == 'i') {
c = data[++i];
c =
/**/c == 'a' ? 'i' :
/**/c == 'b' ? '+' :
/**/c == 'c' ? '/' : data[--i];
}
val = (val << 6) | decodes[c];
pos += 6;
while (pos > 7) {
baos.write(val >> (pos -= 8));
val &= ((1 << pos) - 1);
}
}
return baos.toByteArray();
}
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