java中有关于时间格式以及定时器遇到的问题

标签：定时器 java MM return static Date 格式 Calendar calendar

https://www.cnblogs.com/SjhCode/p/time.html

时间格式
这个是通过Calendar 做时间滚动

//开始时间yyyy-MM-dd HH:mm:ss
@Value("${StartTime}")
@JsonFormat(timezone = "GMT+8", pattern = "yyyy-MM-dd HH:mm:ss")
@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private Date startTime;
//结束时间yyyy-MM-dd HH:mm:ss
@Value("${EntTime}")
@JsonFormat(timezone = "GMT+8", pattern = "yyyy-MM-dd HH:mm:ss")
@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private Date endTime;

//累加时间戳
    startTime = endTime;
// 获取Calendar对象并以传进来的时间为准
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(endTime);
    // 将现在的时间滚动固定时长,转换为Date类型赋值
    calendar.add(Calendar.MONTH, 5);
    // 转换为Date类型再赋值
    Date time = calendar.getTime();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String format = formatter.format(time);
    try {
        endTime=formatter.parse(format);
    } catch (ParseException e) {
        e.printStackTrace();
    }
//或者通过这种时间戳
long startTimeTemp = startTime.getTime();
startTime = endTime;
long endTimeTemp = startTimeTemp + 30*60 * 1000;
endTime = new Date(endTimeTemp);

//这个通过当前时间做滚动，配合定时器使用
startTime = endTime;
endTime = new Date();

处理文件名的日期，存储到字段中。如果对存入时间格式有要求，需要两个SimpleDateFormat

//处理日期
        Dto Dto = new Dto();
    // picUrl = "../../202209151430000001.jpg"
    String str1 = picUrl.substring(picUrl.lastIndexOf("/")+1);
    String str2 = str1.substring(0,14);
    //SimpleDateFormat格式化
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    SimpleDateFormat formatter1 = new SimpleDateFormat("yyyyMMddHHmmss");
    //先转为Date类型
    Date date = new Date(formatter1.parse(str2).getTime());
    
    //将"yyyyMMddHHmmss"的时间格式化为"yyyy-MM-dd HH:mm:ss"字符串，并转成时间类型
    String lastTime = formatter.format(date);        
    Date time = formatter.parse(lastTime)
    Dto.setCreateTime(time);

定时器

定时器要注意，业务处理时间如果太长了，会超过定时器设置时间，导致业务中止重启一遍，注意加事务抛异常。

@Scheduled(cron = "0/10 * * * * ?") 通过cron表达式定时
在定时器里面调用业务层代码

@Autowired
private TestService testService;

//定时器注解
@Scheduled(cron = "0 0/5 * * * ?")
@PostConstruct
private void ScheduledTaskTest(){
    testService.test();
}

@PostConstruct 程序一启动就运行代码，可以配合一下@Scheduled使用，做到程序启动就先执行一次

@PostConstruct
@Scheduled(cron = "0/10 * * * * ?")
private void scheduledTaskTest(){
       
}

DateUtil

import com.alibaba.fastjson.JSON;
import org.apache.commons.lang3.time.DateFormatUtils;

import java.lang.management.ManagementFactory;
import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.time.Duration;
import java.time.Instant;
import java.util.*;

public class DateUtil extends org.apache.commons.lang3.time.DateUtils {
    public static int getMondayPlus() {
        Calendar cd = Calendar.getInstance();
        // 获得今天是一周的第几天，星期日是第一天，星期一是第二天
        int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK);
        if (dayOfWeek == 1) {
            return -6;
        } else {
            return 2 - dayOfWeek;
        }
    }

    // 获取这个星期开始和结束的时间戳
    public static List<Date> weekUtil(){
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        int mondayPlus = getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus);
        Date monday = currentDate.getTime();
        String time=dateFormat.format(monday);
        //System.out.println(time);
        Date date = null;
        try {
            date = dateFormat.parse(time);
        } catch (Exception e) {
            e.printStackTrace();
        }
        //System.out.println(date.getTime());
        Date monDate=date;

        Date nextMon=new Date(monDate.getTime()+86400000*7-1000);

        List<Date> dateList=new LinkedList<>();
        dateList.add(monDate);
        dateList.add(nextMon);

        System.out.println(JSON.toJSON(dateList));
        return dateList;
    }

    /**
     * 获取当月开始时间戳
     *
     * @return
     */
    public static Date getMonthStartTime() {
        Calendar calendar = Calendar.getInstance();// 获取当前日期
        calendar.setTimeZone(TimeZone.getTimeZone("GMT+8:00"));
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.add(Calendar.YEAR, 0);
        calendar.add(Calendar.MONTH, 0);
        calendar.set(Calendar.DAY_OF_MONTH, 1);// 设置为1号,当前日期既为本月第一天
        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();
    }

    /**
     * 获取当月的结束时间戳
     *
     * @return
     */
    public static Date getMonthEndTime() {
        Calendar calendar = Calendar.getInstance();// 获取当前日期
        calendar.setTimeZone(TimeZone.getTimeZone("GMT+8:00"));
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.add(Calendar.YEAR, 0);
        calendar.add(Calendar.MONTH, 0);
        calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));// 获取当前月最后一天
        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();
    }

    // 获取每月开始和结束的时间戳
    public static List<Date> monthUtil(){

        List<Date> dateList=new LinkedList<>();
        dateList.add(getMonthStartTime());
        dateList.add(getMonthEndTime());
        //System.out.println(dateList);
        return dateList;
    }

    public static Date parseDate(String dateStr){
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

        return simpleDateFormat.parse(dateStr,new ParsePosition(0));
    }

    public static Date currentDate(){
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY,0);
        calendar.set(Calendar.MINUTE,0);
        calendar.set(Calendar.SECOND,0);
        return calendar.getTime();
    }

    public static void main(String[] args) {
        weekUtil();
        monthUtil();
    }

    public static Long getDateMinuteSpan(Date sDate,Date eDate){
        Instant sinstant = sDate.toInstant();
        Instant einstant = eDate.toInstant();
        Long min  = Duration.between(sinstant,einstant).toMinutes();
        System.out.println("getDateMinuteSpan:"+min);
        return  min;
    }

    public static Long timeDiff(Long sDate,Long eDate){
        Long diff = (eDate - sDate)/1000/60;
        return diff;
    }

    public static Long getDateSecondSpan(Date sDate,Date eDate){
        Instant sinstant = sDate.toInstant();
        Instant einstant = eDate.toInstant();

        Long sec  = Duration.between(sinstant,einstant).toMillis();
        System.out.println("getDateMinuteSpan:"+sec);
        return  sec;
    }

    public static String YYYY = "yyyy";

    public static String YYYY_MM = "yyyy-MM";

    public static String YYYY_MM_DD = "yyyy-MM-dd";

    public static String YYYYMMDDHHMMSS = "yyyyMMddHHmmss";

    public static String YYYY_MM_DD_HH_MM_SS = "yyyy-MM-dd HH:mm:ss";

    private static String[] parsePatterns = {
            "yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm", "yyyy-MM",
            "yyyy/MM/dd", "yyyy/MM/dd HH:mm:ss", "yyyy/MM/dd HH:mm", "yyyy/MM",
            "yyyy.MM.dd", "yyyy.MM.dd HH:mm:ss", "yyyy.MM.dd HH:mm", "yyyy.MM"};

    /**
     * 获取当前Date型日期
     *
     * @return Date() 当前日期
     */
    public static Date getNowDate()
    {
        return new Date();
    }

    /**
     * 获取当前日期, 默认格式为yyyy-MM-dd
     *
     * @return String
     */
    public static String getDate()
    {
        return dateTimeNow(YYYY_MM_DD);
    }

    public static final String getTime()
    {
        return dateTimeNow(YYYY_MM_DD_HH_MM_SS);
    }

    public static final String dateTimeNow()
    {
        return dateTimeNow(YYYYMMDDHHMMSS);
    }

    public static final String dateTimeNow(final String format)
    {
        return parseDateToStr(format, new Date());
    }

    public static final String dateTime(final Date date)
    {
        return parseDateToStr(YYYY_MM_DD, date);
    }

    public static final String parseDateToStr(final String format, final Date date)
    {
        return new SimpleDateFormat(format).format(date);
    }

    public static final Date dateTime(final String format, final String ts)
    {
        try
        {
            return new SimpleDateFormat(format).parse(ts);
        }
        catch (ParseException e)
        {
            throw new RuntimeException(e);
        }
    }

    /**
     * 日期路径 即年/月/日 如2018/08/08
     */
    public static final String datePath()
    {
        Date now = new Date();
        return DateFormatUtils.format(now, "yyyy/MM/dd");
    }

    /**
     * 日期路径 即年/月/日 如20180808
     */
    public static final String dateTime()
    {
        Date now = new Date();
        return DateFormatUtils.format(now, "yyyyMMdd");
    }

    /**
     * 日期型字符串转化为日期 格式
     */
    public static Date parseDate(Object str)
    {
        if (str == null)
        {
            return null;
        }
        try
        {
            return parseDate(str.toString(), parsePatterns);
        }
        catch (ParseException e)
        {
            return null;
        }
    }

    /**
     * 获取服务器启动时间
     */
    public static Date getServerStartDate()
    {
        long time = ManagementFactory.getRuntimeMXBean().getStartTime();
        return new Date(time);
    }

    /**
     * 计算两个时间差
     */
    public static String getDatePoor(Date endDate, Date nowDate)
    {
        long nd = 1000 * 24 * 60 * 60;
        long nh = 1000 * 60 * 60;
        long nm = 1000 * 60;
        // long ns = 1000;
        // 获得两个时间的毫秒时间差异
        long diff = endDate.getTime() - nowDate.getTime();
        // 计算差多少天
        long day = diff / nd;
        // 计算差多少小时
        long hour = diff % nd / nh;
        // 计算差多少分钟
        long min = diff % nd % nh / nm;
        // 计算差多少秒//输出结果
        // long sec = diff % nd % nh % nm / ns;
        return day + "天" + hour + "小时" + min + "分钟";
    }

    /**
     * 根据日期相加减天数
     */
    public static Date addDate(Date date, int days){
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.DATE, days);
        return calendar.getTime();
    }

    /**
     * 时间戳转成本机时区的格林尼治时间
     * @return
     */
    public static Long dateLongToiso8601() {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
        Calendar calendar = Calendar.getInstance();
        sdf.setTimeZone(TimeZone.getTimeZone("GMT")); // 设置时区为GMT
        //String dateStr = sdf.format(calendar.getTime());
        return calendar.getTime().getTime();
    }

    /**
     * 时间加减分钟
     * @param startDate 要处理的时间，Null则为当前时间
     * @param minutes 加减的分钟
     * @return
     */
    public static Date dateAddMinutes(Date startDate, int minutes) {
        if (startDate == null) {
            startDate = new Date();
        }
        Calendar c = Calendar.getInstance();
        c.setTime(startDate);
        c.set(Calendar.MINUTE, c.get(Calendar.MINUTE) + minutes);
        return c.getTime();
    }

    /**
     * 时间加减秒数
     * @param startDate 要处理的时间，Null则为当前时间
     * @param seconds 加减的秒数
     * @return
     */
    public static Date dateAddSeconds(Date startDate, int seconds) {
        if (startDate == null) {
            startDate = new Date();
        }
        Calendar c = Calendar.getInstance();
        c.setTime(startDate);
        c.set(Calendar.SECOND, c.get(Calendar.SECOND) + seconds);
        return c.getTime();
    }
}

标签：定时器,java,MM,return,static,Date,格式,Calendar,calendar
From： https://www.cnblogs.com/chuangsi/p/17341586.html

java中有关于时间格式以及定时器遇到的问题

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