廢話不多說，貢獻一下code

1.編號生成工具

import org.apache.commons.lang3.StringUtils;

import java.math.BigInteger;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

/**
 * 編號生成工具
 */
@SuppressWarnings("Duplicates")
public abstract class CodeBuilder {
    /**
     * 生成新的流水編號
     *
     * @return
 
 20位字串
     */
    public static final String newTxCode() {
        // 年月日時分秒毫秒(15位)
        String time = new SimpleDateFormat("yyMMddHHmmssSSS").format(new Date());
        StringBuilder builder = new StringBuilder(time);
        Random random = new Random();
        // 隨機數(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 遞迴呼叫
     *
     * @param num  十進位制數
     * @param base 要轉換成的進位制數
     */
    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 遞迴呼叫
     *
     * @param num  十進位制數
     * @param base 要轉換成的進位制數
     */
    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());
        }
    }

    //隨機生成指定長度的程式碼,包含數字
    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);//讓日期加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;
    }

    /**
     * 將日期字串轉換成指定格式的date
     *
     * @param 日期字串
     * @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;
    }

    /**
     * 將日期轉換成指定格式字串
     *
     * @param date
     * @param str
     * @return
     */
    public static String formatDate(Date date, String str) {
        SimpleDateFormat sdf = new SimpleDateFormat(str);
        return sdf.format(date);
    }

    /**
     * 獲取月日時分秒時間戳字串
     *
     * @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.時間工具

import java.util.Calendar;
import java.util.Date;

public class RemindDateUtils {
    /** 
     * 獲得本週的第一天，週一 
     * 
     * @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();
    } 

    /** 
     * 獲得本週的最後一天，週日 
     * 
     * @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();
    } 

    /** 
     * 獲得本天的開始時間，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();
    } 

    /** 
     * 獲得本天的結束時間，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();
    } 

    /** 
     * 獲得本小時的開始時間，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();
    } 

    /** 
     * 獲得本小時的結束時間，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();
    } 

    /** 
     * 獲得本月的開始時間，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();
    } 

    /** 
     * 當前月的結束時間，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();
    } 

    /** 
     * 當前年的開始時間，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(); 
    } 

    /** 
     * 當前年的結束時間，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();
    } 

    /** 
     * 當前季度的開始時間，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(); 
    } 

    /** 
     * 當前季度的結束時間，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();
    } 
    /** 
     * 獲取前/後半年的開始時間 
     * @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();

    } 
    /** 
     * 獲取前/後半年的結束時間 
     * @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();
    } 
}