Java生成随机数工具类，进制之间的转换工具类，获取指定时间，时间格式转换工具类

痛定思痛。 2022-07-16 14:59 176阅读 0赞

## 废话不多说，贡献一下code ##

> 1.编号生成工具

import org.apache.commons.lang3.StringUtils;
    
    import java.math.BigInteger;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.Random;
    
    /** * 编号生成工具 */
    @SuppressWarnings("Duplicates")
    public abstract class CodeBuilder { 
        /** * 生成新的流水编号 * * @return 20位字符串 */
        public static final String newTxCode() {
            // 年月日时分秒毫秒(15位)
            String time = new SimpleDateFormat("yyMMddHHmmssSSS").format(new Date());
            StringBuilder builder = new StringBuilder(time);
            Random random = new Random();
            // 随机数(5位)
            for (int i = 0; i < 5; i++) {
                int nextInt = random.nextInt(10);
                builder.append(nextInt);
            }
    
            return builder.toString();
        }
    
        public static final String genNextRadixCode(String precode) throws Exception {
            if (StringUtils.isBlank(precode)) {
                return "01";
            }
            int n=Integer.parseUnsignedInt(precode, 36);
            n++;
            return ten2radix(n,36).length()==1?"0"+ten2radix(n,36):ten2radix(n,36);
        }
    
        public static void main(String[] args) {
            try {
                System.out.println(genNextRadixCode("ZX"));
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    
    
        /** * baseString 递归调用 * * @param num 十进制数 * @param base 要转换成的进制数 */
        public static String ten2radix(int num, int base) {
            String str = "", digit = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            if (num == 0) {
                return "";
            } else {
                str = ten2radix(num / base, base);
                return str + digit.charAt(num % base);
            }
        }
    
        /** * baseString 递归调用 * * @param num 十进制数 * @param base 要转换成的进制数 */
        public static String ten2radix(BigInteger num, int base) {
            String str = "", digit = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            if (num.shortValue() == 0) {
                return "";
            } else {
                BigInteger valueOf = BigInteger.valueOf(base);
                str = ten2radix(num.divide(valueOf), base);
                return str + digit.charAt(num.mod(valueOf).shortValue());
            }
        }
    
        //随机生成指定长度的代码,包含数字
        public static final String generateRandomNumber(int length) {
            String allChar = "0123456789";
            StringBuffer sb = new StringBuffer();
            Random random = new Random();
            for (int i = 0; i < length; i++) {
                sb.append(allChar.charAt(random.nextInt(allChar.length())));
            }
            return sb.toString();
        }
    
    }

> 2.日期工具

import org.apache.commons.lang3.StringUtils;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    import java.text.DateFormat;
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Calendar;
    import java.util.Date;
    import java.util.TimeZone;
    import java.util.regex.Pattern;
    
    public class DateUtils { 
    
        private static Logger logger = LoggerFactory.getLogger(DateUtils.class);
    
        private static final String DATE_FORMAT = "yyyy-MM-dd";
        private static final String DATE_TIME_FORMAT_1 = "yyyy-MM-dd'T'HH:mm:ss";
        public static final String DATE_TIME_FORMAT_2 = "yyyy-MM-dd HH:mm:ss";
        public static final String DATE_TIME_FORMAT_3 = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";
        public static final String DATE_TIME_FORMAT_4 = "MMddHHmmssSSS";
    
        private static final Pattern DATE_PATTERN = Pattern.compile("^\\d{4}-\\d{2}-\\d{2}$");
        private static final Pattern DATE_TIME_PATTERN_1 = Pattern.compile("^\\d{4}-\\d{2}-\\d{2}[T]\\d{2}:\\d{2}:\\d{2}$");
        private static final Pattern DATE_TIME_PATTERN_2 = Pattern.compile("^\\d{4}-\\d{2}-\\d{2}\\s\\d{2}:\\d{2}:\\d{2}$");
    
        public static Date addDays(Date start, int addDay) {
            Date date = getDateBegin(start);
            Calendar cs = Calendar.getInstance();
            cs.setTime(date);
            cs.set(Calendar.DAY_OF_MONTH, cs.get(Calendar.DAY_OF_MONTH) + addDay);//让日期加1
            return cs.getTime();
        }
    
        public static Date parse(String dateString) {
            Date date = null;
            if (!StringUtils.isBlank(dateString)) {
                try {
                    if (DATE_PATTERN.matcher(dateString).find()) {
                        date = new SimpleDateFormat(DATE_FORMAT).parse(dateString);
                    } else if (DATE_TIME_PATTERN_1.matcher(dateString).find()) {
                        date = new SimpleDateFormat(DATE_TIME_FORMAT_1).parse(dateString);
                    } else if (DATE_TIME_PATTERN_2.matcher(dateString).find()) {
                        date = new SimpleDateFormat(DATE_TIME_FORMAT_2).parse(dateString);
                    }
                } catch (ParseException e) {
                    logger.debug("Exception: {}", e);
                }
            }
    
            return date;
        }
    
        /** * 将日期字符串转换成指定格式的date * * @param 日期字符串 * @param 日期格式 * @return */
        public static Date formatStr(String str, String formatStr) {
    
            Date date = null;
            if (str != null) {
                DateFormat sdf = new SimpleDateFormat(formatStr);
                try {
                    if (formatStr.equals(DATE_TIME_FORMAT_3)) {
                        sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
                    }
                    date = sdf.parse(str);
                } catch (ParseException e) {
                    e.printStackTrace();
                }
            }
            return date;
        }
    
        /** * 将日期转换成指定格式字符串 * * @param date * @param str * @return */
        public static String formatDate(Date date, String str) {
            SimpleDateFormat sdf = new SimpleDateFormat(str);
            return sdf.format(date);
        }
    
        /** * 获取月日时分秒时间戳字符串 * * @return */
        public static String getTimeString() {
            Date now = new Date();
            DateFormat sdf = new SimpleDateFormat(DATE_TIME_FORMAT_4);
            return sdf.format(now);
        }
    
        public static Date getDateBegin(Date date) {
            if (date == null) {
                date = new Date();
            }
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(date);
            calendar.set(Calendar.HOUR_OF_DAY, 0);
            calendar.set(Calendar.MINUTE, 0);
            calendar.set(Calendar.SECOND, 0);
            calendar.set(Calendar.MILLISECOND, 0);
            return calendar.getTime();
        }
    
        public static Date getDateEnd(Date date) {
            if (date == null) {
                date = new Date();
            }
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(date);
            calendar.set(Calendar.HOUR_OF_DAY, 23);
            calendar.set(Calendar.MINUTE, 59);
            calendar.set(Calendar.SECOND, 59);
            calendar.set(Calendar.MILLISECOND, 999);
            return calendar.getTime();
        }
    
    }

> 3.时间工具

import java.util.Calendar;
    import java.util.Date;
    
    public class RemindDateUtils { 
        /** * 获得本周的第一天，周一 * * @return */ 
        public static Date getCurrentWeekDayStartTime() { 
            Calendar c = Calendar.getInstance(); 
            int day_of_week = c.get(Calendar.DAY_OF_WEEK) - 1;
            if (day_of_week == 0) {
                day_of_week = 7;
            }
            c.add(Calendar.DATE, -day_of_week + 1);
            c.set(Calendar.HOUR_OF_DAY, 0);
            c.set(Calendar.MINUTE, 0);
            c.set(Calendar.SECOND, 0);
            return c.getTime();
        } 
    
        /** * 获得本周的最后一天，周日 * * @return */ 
        public static Date getCurrentWeekDayEndTime() { 
            Calendar c = Calendar.getInstance(); 
            int weekday = c.get(Calendar.DAY_OF_WEEK); 
            c.add(Calendar.DATE, 8 - weekday);
            c.set(Calendar.HOUR_OF_DAY, 23);
            c.set(Calendar.MINUTE, 59);
            c.set(Calendar.SECOND, 59);
            return c.getTime();
        } 
    
        /** * 获得本天的开始时间，即2012-01-01 00:00:00 * * @return */ 
        public static Date getCurrentDayStartTime() { 
            Calendar c = Calendar.getInstance(); 
            c.set(Calendar.HOUR_OF_DAY, 0);
            c.set(Calendar.MINUTE, 0);
            c.set(Calendar.SECOND, 0);
            return c.getTime();
        } 
    
        /** * 获得本天的结束时间，即2012-01-01 23:59:59 * * @return */ 
        public static Date getCurrentDayEndTime() { 
            Calendar c = Calendar.getInstance(); 
            c.set(Calendar.HOUR_OF_DAY, 23);
            c.set(Calendar.MINUTE, 59);
            c.set(Calendar.SECOND, 59);
            return c.getTime();
        } 
    
        /** * 获得本小时的开始时间，即2012-01-01 00:00:00 * * @return */ 
        public static Date getCurrentHourStartTime() { 
            Calendar c = Calendar.getInstance(); 
            c.set(Calendar.MINUTE, 0);
            c.set(Calendar.SECOND, 0);
            return c.getTime();
        } 
    
        /** * 获得本小时的结束时间，即2012-01-01 23:59:59 * * @return */ 
        public static Date getCurrentHourEndTime() { 
            Calendar c = Calendar.getInstance(); 
            c.set(Calendar.MINUTE, 59);
            c.set(Calendar.SECOND, 59);
            return c.getTime();
        } 
    
        /** * 获得本月的开始时间，即2012-01-01 00:00:00 * * @return */ 
        public static Date getCurrentMonthStartTime() { 
            Calendar c = Calendar.getInstance(); 
            c.set(Calendar.DATE, 1); 
            c.set(Calendar.HOUR_OF_DAY, 0);
            c.set(Calendar.MINUTE, 0);
            c.set(Calendar.SECOND, 0);
            return c.getTime();
        } 
    
        /** * 当前月的结束时间，即2012-01-31 23:59:59 * * @return */ 
        public static Date getCurrentMonthEndTime() { 
            Calendar c = Calendar.getInstance(); 
            c.set(Calendar.DATE, 1); 
            c.add(Calendar.MONTH, 1); 
            c.add(Calendar.DATE, -1); 
            c.set(Calendar.HOUR_OF_DAY, 23);
            c.set(Calendar.MINUTE, 59);
            c.set(Calendar.SECOND, 59);
            return c.getTime();
        } 
    
        /** * 当前年的开始时间，即2012-01-01 00:00:00 * * @return */ 
        public static Date getCurrentYearStartTime() { 
            Calendar c = Calendar.getInstance(); 
            c.set(Calendar.MONTH, 0); 
            c.set(Calendar.DATE, 1); 
            c.set(Calendar.HOUR_OF_DAY, 0);
            c.set(Calendar.MINUTE, 0);
            c.set(Calendar.SECOND, 0);
            return c.getTime(); 
        } 
    
        /** * 当前年的结束时间，即2012-12-31 23:59:59 * * @return */ 
        public static Date getCurrentYearEndTime() { 
            Calendar c = Calendar.getInstance(); 
            c.set(Calendar.MONTH, 11); 
            c.set(Calendar.DATE, 31); 
            c.set(Calendar.HOUR_OF_DAY, 23);
            c.set(Calendar.MINUTE, 59);
            c.set(Calendar.SECOND, 59);
            return c.getTime();
        } 
    
        /** * 当前季度的开始时间，即2012-01-1 00:00:00 * * @return */ 
        public static Date getCurrentQuarterStartTime() { 
            Calendar c = Calendar.getInstance();
            int currentMonth = c.get(Calendar.MONTH) + 1; 
            if (currentMonth >= 1 && currentMonth <= 3) 
                c.set(Calendar.MONTH, 0); 
            else if (currentMonth >= 4 && currentMonth <= 6) 
                c.set(Calendar.MONTH, 3); 
            else if (currentMonth >= 7 && currentMonth <= 9) 
                c.set(Calendar.MONTH, 4); 
            else if (currentMonth >= 10 && currentMonth <= 12) 
                c.set(Calendar.MONTH, 9); 
            c.set(Calendar.DATE, 1); 
            c.set(Calendar.HOUR_OF_DAY, 0);
            c.set(Calendar.MINUTE, 0);
            c.set(Calendar.SECOND, 0);
            return c.getTime(); 
        } 
    
        /** * 当前季度的结束时间，即2012-03-31 23:59:59 * * @return */ 
        public static Date getCurrentQuarterEndTime() { 
            Calendar c = Calendar.getInstance(); 
            int currentMonth = c.get(Calendar.MONTH) + 1; 
            if (currentMonth >= 1 && currentMonth <= 3) { 
                c.set(Calendar.MONTH, 2); 
                c.set(Calendar.DATE, 31); 
            } else if (currentMonth >= 4 && currentMonth <= 6) { 
                c.set(Calendar.MONTH, 5); 
                c.set(Calendar.DATE, 30); 
            } else if (currentMonth >= 7 && currentMonth <= 9) { 
                c.set(Calendar.MONTH,8); 
                c.set(Calendar.DATE, 30); 
            } else if (currentMonth >= 10 && currentMonth <= 12) { 
                c.set(Calendar.MONTH, 11); 
                c.set(Calendar.DATE, 31); 
            } 
            c.set(Calendar.HOUR_OF_DAY, 23);
            c.set(Calendar.MINUTE, 59);
            c.set(Calendar.SECOND, 59);
            return c.getTime();
        } 
        /** * 获取前/后半年的开始时间 * @return */ 
        public static Date getHalfYearStartTime(){ 
            Calendar c = Calendar.getInstance(); 
            int currentMonth = c.get(Calendar.MONTH) + 1; 
            if (currentMonth >= 1 && currentMonth <= 6){ 
                c.set(Calendar.MONTH, 0); 
            }else if (currentMonth >= 7 && currentMonth <= 12){ 
                c.set(Calendar.MONTH, 6); 
            } 
            c.set(Calendar.DATE, 1); 
            c.set(Calendar.HOUR_OF_DAY, 0);
            c.set(Calendar.MINUTE, 0);
            c.set(Calendar.SECOND, 0);
            return c.getTime();
    
        } 
        /** * 获取前/后半年的结束时间 * @return */ 
        public static Date getHalfYearEndTime(){ 
            Calendar c = Calendar.getInstance(); 
            int currentMonth = c.get(Calendar.MONTH) + 1; 
            if (currentMonth >= 1 && currentMonth <= 6){ 
                c.set(Calendar.MONTH, 5); 
                c.set(Calendar.DATE, 30); 
            }else if (currentMonth >= 7 && currentMonth <= 12){ 
                c.set(Calendar.MONTH, 11); 
                c.set(Calendar.DATE, 31); 
            } 
            c.set(Calendar.HOUR_OF_DAY, 23);
            c.set(Calendar.MINUTE, 59);
            c.set(Calendar.SECOND, 59);
            return c.getTime();
        } 
    }