将int类型有顺序的字符串组合相互转换
import java.util.HashMap;
import java.util.Map;
public class CodeTest {
private static final char[] allChar =
new char[]{
'D',
'H',
'K',
'A',
'4',
'S',
'G',
'8',
'B',
'J',
'C',
'L',
'X',
'2',
'P',
'E',
'6',
'5',
'7',
'9',
'M',
'3',
'Y',
'R',
'F',
'T',
'U',
'V',
'W',
'N',
'Q',
'Z'};
private static final Map<String, Integer> charAndNum =
new HashMap<>();
private static final int codeSize =
6;
public static String
getCodeByUid(
int num) {
char[] buf =
new char[
32];
int charPos =
32;
while ((num / allChar.length) >
0) {
buf[--charPos] = allChar[(num % allChar.length)];
num /= allChar.length;
}
buf[--charPos] = allChar[(num % allChar.length)];
String str =
new String(buf, charPos, (
32 - charPos));
if (str.length() < codeSize) {
StringBuffer sb =
new StringBuffer();
for (
int i =
0; i < codeSize - str.length(); i++) {
sb.append(allChar[
0]);
}
sb.append(str);
str = sb.toString();
}
return str;
}
public static int getUidByCode(String code) {
if (code ==
null) {
return 0;
}
char[] codet = code.toCharArray();
for (
char a : codet) {
if (!(a >=
'1' && a <
'9' || a >=
'A' && a <=
'Z' || a >=
'a' && a <=
'z')) {
return 0;
}
}
code = code.toUpperCase();
char[] codes = code.toCharArray();
if (codes.length != codeSize) {
return 0;
}
int uid =
0;
for (
int i =
0; i < codes.length; i++) {
uid += charAndNum.get(String.valueOf(codes[i])) * Math.pow(allChar.length, codes.length - i -
1);
}
return uid;
}
public static void main(String[] args) {
if (charAndNum.size() ==
0) {
for (
int i =
0; i < allChar.length; i++) {
charAndNum.put(String.valueOf(allChar[i]), i);
}
}
int uid = getUidByCode(
"DJ5F5Z");
System.out.println(uid);
System.out.println(getCodeByUid(
10019391));
}
}
