自己实现的62进制转10进制互转

public static final char[] CHARS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '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' };
/**
* 62进制字符转换10进制数值
*
* @param value
* @return
*/
public static long convertToTenHex(String value) {
long v = 0;
if (BaseUtil.isNotEmpty(value)) {
char[] chars = StringUtils.reverse(value).toCharArray();
for (int i = 0; i < chars.length; i++) {
int asc = chars[i];
int n = 0;
if (asc >= 48 && asc <= 57) {
n = asc - 48;
} else if (asc >= 97 && asc <= 122) {
n = asc - 87;
} else if (asc >= 65 && asc <= 90) {
n = asc - 29;
}
v += (long) (Math.pow(CHARS.length, i) * n);
}
}
return v;
}

/**
* 10进制数值转换62进制字符
*
* @param num
* @return
*/
public static String convertToSixtyHex(long num) {
StringBuilder value = new StringBuilder();
while (true) {
int n = (int) (num % CHARS.length);
num = (num - n) / CHARS.length;
value.append(CHARS
);
if (num <= 0)
break;
}
return value.reverse().toString();
}
/**
* @param args
*/
public static void main(String[] args) {
long t = System.currentTimeMillis();
System.out.println(t);
String s = BaseUtil.convertToSixtyHex(t);
System.out.println(s);
long v = BaseUtil.convertToTenHex(s);
System.out.println(v);
}