【流水号】java生成流水编号实现,格式【四位前缀+yyyyMMdd+4位流水】
1.由于业务需求需要生成流水单号：
1.格式为：四位前缀+yyyyMMdd+4位流水
2.示例：XXXX202003210123
3.要求：同一天内4位流水顺序递增，递增规则如下：
·0001 - 9999 【达到9999进一位首位为A001】
·A001 - A999 【进位为B001】
·B001 - B999
...
·Z001 - Z999 【进位为ZA01】
·ZZ01 - ZZ99
·ZZZ1 - ZZZ9
·ZZZA - ZZZZ
2.代码OddUtils.java
package org.jingniu.utils;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern;
/**
* 流水号生成管理：
*
* 请购申请 QGSQ+日期+4位流水
* 采购申请 CGSQ+日期+4位流水
* 采购接收 CGRK+日期+4位流水
* 采购 退货直接更新采购申请 不生成新单据
**/
public class OddUtil {
/**
* 采购申请 CGSQ+日期+4位流水
*/
public static final String ODDNUM_CGSQ = "CGSQ";
/**
* 采购接收 CGRK+日期+4位流水
*/
public static final String ODDNUM_CGRK = "CGRK";
/**
* 请购申请 QGSQ+日期+4位流水
*/
public static final String ODDNUM_QGSQ = "QGSQ";
/**
* 编写测试流水订单号
* @param num
* @return
*/
public static String getBody(Integer num) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
String str = String.format("%04d", num);
return sdf.format(new Date()).substring(0, 8) + str;
}
/**
* 截取流水单号入库日期
*
* @param string
* @return
*/
public static int getOddSenttime(String string) {
int oddSenttime = Integer.parseInt(string.substring(4, 12));
return oddSenttime;
}
public static int getNowTimeCode() {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd");
int nowTimeCode = Integer.parseInt(simpleDateFormat.format(new Date()).substring(0, 8));
return nowTimeCode;
}
public static Map splitNum(String str, int i) {
HashMap om = new HashMap<>();
if (i <= str.toCharArray().length) {
String suffix = str.substring(0, i);
String currStr = str.substring(i);
if (isNumeric(currStr)) {
om.put("suffix", suffix);
om.put("number", currStr);
return om;
} else {
return splitNum(str, i + 1);
}
} else {
return null;
}
}
/**
* 判断字符串并加一
*
* @param str
* @param i
* @return
*/
public static String splitNumNext(String str, int i) {
String suffix = str.substring(0, i);
String currStr = str.substring(i);
if (isNumeric(currStr)) {
if (suffix.equals("")) {
suffix = null;
}
if (currStr.equals("")) {
currStr = null;
}
//9999
if (suffix == null) {
//头
if (currStr.equals("9999")) {
return "A001";
} else {
return getConvertNum(currStr);
}
} else if (currStr == null) {
if (suffix.equals("ZZZZ")) {
//当天流水号已用完，返回null
return null;
} else {//ZZZA-ZZZY 只剩25个加一
String s = getNextChar(suffix);
return s;
}
} else if (suffix != null && currStr != null) {
//suffix长度为0或4的已经在上面处理，此处处理1-3
return getNextOdd(suffix.length(), suffix, currStr);
}
} else {
return splitNumNext(str, i + 1);
}
return null;
}
private static String getNextOdd(int length, String suffix, String currStr) {
//前缀长度不可能为4，只处理1,2,3
String zNum = length == 2 ? "Z" : length == 3 ? "ZZ" : "";
suffix = suffix.substring(length - 1);
//不是Z就是A-Y，取得是最后一个字母
if (suffix.equals("Z")) {
if (currStr.equals("999")) {
return "ZA01";
} else if (currStr.equals("99")) {
return "ZZA1";
} else if (currStr.equals("9")) {
return "ZZZA";
} else {
String str = getConvertNum(currStr);
return zNum + suffix + str;
}
} else {
//如果不是Z，每个字母满999都要将前缀加一
if (currStr.equals("999")) {
return zNum + getNextChar(suffix) + "001";
} else if (currStr.equals("99")) {
return zNum + getNextChar(suffix) + "01";
} else if (currStr.equals("9")) {
return zNum + getNextChar(suffix) + "1";
} else {
String str = getConvertNum(currStr);
return zNum + suffix + str;
}
}
}
private static String getConvertNum(String currStr) {
return String.format("%0" + currStr.length() + "d", (Integer.parseInt(currStr) + 1));
}
private static String getNextChar(String suffix) {
char[] chars = suffix.toCharArray();
char last = (char) (chars[chars.length - 1] + 1);
chars[chars.length - 1] = last;
return String.valueOf(chars);
}
public static boolean isNumeric(String str) {
Pattern pattern = Pattern.compile("[0-9]*");
return pattern.matcher(str).matches();
}
/**
* 生成流水单号
*
* @param suffix: 请购申请 QGSQ+日期+4位流水
* 采购申请 CGSQ+日期+4位流水
* 采购接收 CGRK+日期+4位流水
* @param oddMaxCode: QGSQ202003010023
* @return
*/
public static String createOdd(String suffix, String oddMaxCode) {
String nowOdd = null;
//如果最大流水单号不为空
if (oddMaxCode != null) {
//如果当前时间不相同，例如：20181009=！20180809，重新开始以当天日期拼流水单号201810100001
if (getNowTimeCode() != getOddSenttime(oddMaxCode)) {
int number = 1;
nowOdd = new StringBuffer(suffix).append(getBody(number)).toString();
//相同，则加1，例如：201810100002
} else {
//TODO 处理当天超过9999，然后进位 为 A001-A999 B001-B999 ZA01-ZA99
//获取最后四位流水号
String odd = oddMaxCode.substring(12, 16);
String s = splitNumNext(odd, 0);
nowOdd = new StringBuffer(suffix).append(oddMaxCode.substring(4,12)).append(s).toString();
}
} else {
//如果没有流水单号，以当前日期重新开始生成流水单号
int number = 1;
nowOdd = new StringBuffer(suffix).append(getBody(number)).toString();
}
return nowOdd;
}
}
3.测试：test.java
public static void main(String[] args) {
System.err.println(createOdd("QGSQ", "QGSQ202003210123"));
System.err.println(createOdd("QGSQ", "QGSQ20200321ZZ23"));
System.err.println(createOdd("QGSQ", "QGSQ20200321ZZZ3"));
System.err.println(createOdd("QGSQ", "QGSQ20200321ZZ99"));
System.err.println(createOdd("QGSQ", "QGSQ20200321A013"));
String name1 = "9998";
String name2 = "9999";
String name3 = "A001";
String name4 = "A998";
String name5 = "Z001";
String name6 = "Z999";
String name7 = "ZA01";
String name8 = "ZA99";
String name9 = "ZZ09";
String name10 = "ZZ99";
String name11 = "ZZZ1";
String name12 = "ZZZZ";
System.err.println(splitNumNext(name1, 0));
System.err.println(splitNumNext(name2, 0));
System.err.println(splitNumNext(name3, 0));
System.err.println(splitNumNext(name4, 0));
System.err.println(splitNumNext(name5, 0));
System.err.println(splitNumNext(name6, 0));
System.err.println(splitNumNext(name7, 0));
System.err.println(splitNumNext(name8, 0));
System.err.println(splitNumNext(name9, 0));
System.err.println(splitNumNext(name10, 0));
System.err.println(splitNumNext(name11, 0));
System.err.println(splitNumNext(name12, 0));
}