public
class
SerialNumberUtil
{
private
static
final
Pattern
pattern
=
Pattern.compile(
"[0-9]*"
);
private
static
final
StringBuffer
strJoint
=
new
StringBuffer
();
*
@param
prefix 前缀
*
@param
code 字母流水号
*
@param
len 位数
*
@return
public
static
final
synchronized
String
getNextUppercaseSerialNumber
(String prefix, String code,
int
len)
{
String
str
=
getNextUppercaseSerialNumber(code, len);
strJoint.setLength(
0
);
return
strJoint.append(prefix).append(str).toString();
* 大写字母流水号递增
* * 字母前缀 + 数字位 = 4位，
* * 数字位全为9 进一位字母
* * 最大支持 0001 ~ ZZZZ -> 717948
*
@param
code
*
@param
len
*
@return
public
static
final
synchronized
String
getNextUppercaseSerialNumber
(String code,
int
len)
{
if
(code.length() > len) {
throw
new
RuntimeException
(
"流水号位数已经超"
+ len);
strJoint.setLength(
0
);
if
(isNumeric(code)) {
strJoint.append(getConvertNum(Integer.valueOf(code) +
1
,
4
));
if
(strJoint.length() > len) {
strJoint.setLength(
0
);
strJoint.append(
"A"
).append(getRepeatCode(
"0"
, len -
2
)).append(
"1"
);
return
strJoint.toString();
if
(code.equals(getRepeatCode(
"Z"
, len))) {
return
code;
String
prefix
=
getUppercasePrefix(code);
if
(prefix.length() == len) {
prefix = getNextUppercase(prefix, len);
return
prefix;
String
suffix
=
code.substring(code.lastIndexOf(prefix) + prefix.length());
if
(suffix.equals(getRepeatCode(
"9"
, suffix.length()))) {
if
(prefix.length() ==
1
&& prefix.equals(
"Y"
)) {
strJoint.setLength(
0
);
strJoint.append(
"Z"
).append(getRepeatCode(
"0"
, len - prefix.length() -
1
)).append(
"1"
);
return
strJoint.toString();
prefix = getNextUppercase(prefix, len);
if
(prefix.length() == len) {
return
prefix;
strJoint.setLength(
0
);
strJoint.append(prefix).append(getRepeatCode(
"0"
, len - prefix.length() -
1
)).append(
"1"
);
return
strJoint.toString();
strJoint.setLength(
0
);
strJoint.append(prefix).append(getConvertNum(Integer.parseInt(suffix) +
1
, suffix.length()));
return
strJoint.toString();
* 字母递增
*
@param
prefix
*
@return
public
static
final
synchronized
String
getNextUppercase
(String prefix,
int
len)
{
char
[] chars = prefix.toCharArray();
prefix = String.valueOf(getNextChar(chars, chars.length -
1
));
if
(prefix.length() < len && prefix.equals(getRepeatCode(
"Z"
, prefix.length()))) {
strJoint.setLength(
0
);
strJoint.append(getRepeatCode(
"A"
, prefix.length() +
1
));
return
strJoint.toString();
return
prefix;
* 字母位数递增
*
@param
chars
*
@param
index
*
@return
public
static
final
char
[] getNextChar(
char
[] chars,
int
index) {
if
(
0
== index &&
"Z"
.equals(String.valueOf(chars[
0
]))) {
return
chars;
if
(
"Z"
.equals(String.valueOf(chars[index]))) {
char
last
=
(
char
) (chars[index] -
25
);
chars[index] = last;
return
getNextChar(chars, index -
1
);
char
last
=
(
char
) (chars[index] +
1
);
chars[index] = last;
return
chars;
* 获取重复位数
*
@param
s
*
@param
len
*
@return
public
static
final
String
getRepeatCode
(String s,
int
len)
{
return
String.join(StrUtil.EMPTY, Collections.nCopies(len, s));
* 位数补全
*
@param
num
*
@param
len
*
@return
public
static
final
String
getConvertNum
(
int
num,
int
len)
{
return
String.format(
"%0"
+ len +
"d"
, num);
* 判断数字格式
*
@param
str
*
@return
public
static
final
boolean
isNumeric
(String str)
{
return
pattern.matcher(str).matches();
* 获取大写字母前缀
*
@param
str
*
@return
public
static
final
String
getUppercasePrefix
(String str)
{
return
str.replaceAll(
"\s*"
,
""
).replaceAll(
"[^(A-Z)]"
,
""
);
public
static
void
main
(String[] args)
{
Set<String> list =
new
HashSet
<>();
String
code
=
"0"
;
try
(
FileOutputStream
fileOutputStream
=
new
FileOutputStream
(
new
File
(
"d:/case.txt"
))) {
for
(
int
i
=
0
; i <
1000000
; i++) {
code = getNextUppercaseSerialNumber(code,
4
);
if
(!list.add(code)) {
throw
new
RuntimeException
(String.format(
"已存在：Code=%s，Index=%s \r\n"
, code, i));
String
msg
=
String.format(
"Code=%s，Index=%s \r\n"
, code, i);
fileOutputStream.write(msg.getBytes());
}
catch
(Exception e) {
e.printStackTrace();
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