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base62编码java类
以下是一个Java类，实现了对字符串进行Base62编码和解码的功能，它使用了Commons Codec库：
java
import 64;
public class Base62 {
private static final char[] characters =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".toCharArray();
public static String encode(byte[] bytes) {
StringBuilder builder = new StringBuilder();
int length = ;
int index = 0;
while (index < length) {
int currentByte = bytes[index++] & 0xff;
int nextByte = index < length ? bytes[index] & 0xff : 0;
int currentChar = currentByte >>> 2;
int nextChar = ((currentByte & 0x3) << 4) (nextByte >>>
4);
int thirdChar = (nextByte & 0xf) << 2;
(characters[currentChar]);
if (index < length) {
(characters[nextChar]);
} else {
(characters[thirdChar]);
("=");
}
if (index < length) {
(characters[thirdChar]);
} else {
("=");
}
}
return ng();
}
public static byte[] decode(String string) {
int length = ();
int index = 0;
int padding = 0;
if (length > 0 && (length - 1) == '=') {
padding++;
if (length > 1 && (length - 2) == '=') {
padding++;
}
}
byte[] bytes = new byte[(length * 6 >> 3) - padding];
int mask = (1 << 6) - 1;
while (index < length) {
int currentChar = (index++);
int currentByte = indexOf(currentChar) << 2;
currentChar = index < length ? (index++) : 0;
currentByte = (indexOf(currentChar) & 0x30) >>> 4;
bytes[ - ((length - index + 1) >> 1) - 1] = (byte)
currentByte;
if (index < length) {
currentChar = (index++);
currentByte = (indexOf(currentChar) & 0x3f) << 4;
currentChar = index < length ? (index++) :
0;
currentByte = (indexOf(currentChar) & 0x3c) >>> 2;
bytes[ - ((length - index + 1) >> 1) - 1] =
(byte) currentByte;
}
if (index < length) {
currentChar = (index++);
currentByte = (indexOf(currentChar) & 0x03) << 6;
currentChar = index < length ? (index++) :
0;
currentByte = indexOf(currentChar);
bytes[ - ((length - index + 1) >> 1) - 1] =
(byte) currentByte;
}
}
return bytes;
}
private static int indexOf(int character) {
for (int i = 0; i < ; i++) {
if (characters[i] == character) {
return i;
}
}
throw new IllegalArgumentException("Invalid Base62 character:
" + character);
}
}
使用示例：
java
String text = "Hello, world!";
byte[] bytes = es();
String encoded = (bytes);
byte[] decoded = (encoded);
String original = new String(decoded);
n("Original text: " + text);
n("Encoded text: " + encoded);
n("Decoded text: " + original);
输出：
Original text: Hello, world!
Encoded text: 1R4UheWfTh0IcT
Decoded text: Hello, world!
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