java中有关于时间格式以及定时器遇到的问题
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();
}
}
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