java 显示当前时间带毫秒

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索姆拉 2024-09-07 09:21:24
文章标签 java 显示当前时间带毫秒 java 字符串格式化日期 文章分类 Java 后端开发
/**
 * 将某个日期以固定格式转化成字符串
 * 
 * @param date
 * @return String
 */
public static String dateToStr(java.util.Date date)
 {
 SimpleDateFormat sdf = newSimpleDateFormat("yyyy-MM-dd HH:mm:ss");
 String str =sdf.format(date);
return str;
 }/**
 * 格式化日期
 * 
 * @param dateStr
 * 字符型日期
 * @param format
 * 格式
 * @return 返回日期
 */
public static java.util.Date parseDate(String dateStr, Stringformat)
 {
 java.util.Date date = null;
try
 {
 java.text.DateFormat df = newjava.text.SimpleDateFormat(format);
 String dt =dateStr.replaceAll("-", "/");
if((!dt.equals("")) && (dt.length() <format.length()))
 {
 dt +=format.substring(dt.length()).replaceAll("[YyMmDdHhSs]","0");
 }
 date = (java.util.Date)df.parse(dt);
 }
catch (Exception e)
 {
 }
return date;
 }

/**
 * @param dateStr
 * @return Date
 */
public static java.util.Date parseDate(String dateStr)
 {
return parseDate(dateStr, "yyyy/MM/dd");
 }

/**
 * 格式化输出日期
 * 
 * @param date
 * 日期
 * @param format
 * 格式
 * @return 返回字符型日期
 */
public static String format(java.util.Date date, Stringformat)
 {
 String result ="";
try
 {
if (date != null)
 {
 java.text.DateFormat df =newjava.text.SimpleDateFormat(format);
 result =df.format(date);
 }
 }
catch (Exception e)
 {
 }
return result;
 }

public static String format(java.util.Date date)
 {
return format(date, "yyyy/MM/dd");
 }

/**
 * 返回年份
 * 
 * @param date
 * 日期
 * @return 返回年份
 */
public static int getYear(java.util.Date date)
 {
 java.util.Calendar c =java.util.Calendar.getInstance();
 c.setTime(date);
return c.get(java.util.Calendar.YEAR);
 }

/**
 * 返回月份
 * 
 * @param date
 * 日期
 * @return 返回月份
 */
public static int getMonth(java.util.Date date)
 {
 java.util.Calendar c =java.util.Calendar.getInstance();
 c.setTime(date);
return c.get(java.util.Calendar.MONTH) + 1;
 }

/**
 * 返回日份
 * 
 * @param date
 * 日期
 * @return 返回日份
 */
public static int getDay(java.util.Date date)
 {
 java.util.Calendar c =java.util.Calendar.getInstance();
 c.setTime(date);
return c.get(java.util.Calendar.DAY_OF_MONTH);
 }

/**
 * 返回小时
 * 
 * @param date
 * 日期
 * @return 返回小时
 */
public static int getHour(java.util.Date date)
 {
 java.util.Calendar c =java.util.Calendar.getInstance();
 c.setTime(date);
return c.get(java.util.Calendar.HOUR_OF_DAY);
 }

/**
 * 返回分钟
 * 
 * @param date
 * 日期
 * @return 返回分钟
 */
public static int getMinute(java.util.Date date)
 {
 java.util.Calendar c =java.util.Calendar.getInstance();
 c.setTime(date);
return c.get(java.util.Calendar.MINUTE);
 }

/**
 * 返回秒钟
 * 
 * @param date
 * 日期
 * @return 返回秒钟
 */
public static int getSecond(java.util.Date date)
 {
 java.util.Calendar c =java.util.Calendar.getInstance();
 c.setTime(date);
return c.get(java.util.Calendar.SECOND);
 }

/**
 * 返回毫秒
 * 
 * @param date
 * 日期
 * @return 返回毫秒
 */
public static long getMillis(java.util.Date date)
 {
 java.util.Calendar c =java.util.Calendar.getInstance();
 c.setTime(date);
return c.getTimeInMillis();
 }

/**
 * 返回字符型日期
 * 
 * @param date
 * 日期
 * @return 返回字符型日期
 */
public static String getDate(java.util.Date date)
 {
return format(date, "yyyy/MM/dd");
 }

/**
 * 返回字符型时间
 * 
 * @param date
 * 日期
 * @return 返回字符型时间
 */
public static String getTime(java.util.Date date)
 {
return format(date, "HH:mm:ss");
 }

/**
 * 返回字符型日期时间
 * 
 * @param date
 * 日期
 * @return 返回字符型日期时间
 */
public static String getDateTime(java.util.Date date)
 {
return format(date, "yyyy/MM/dd HH:mm:ss");
 }

/**
 * 日期相加
 * 
 * @param date
 * 日期
 * @param day
 * 天数
 * @return 返回相加后的日期
 */
public static java.util.Date addDate(java.util.Date date, int day)
 {
 java.util.Calendar c =java.util.Calendar.getInstance();
 c.setTimeInMillis(getMillis(date)+ ((long) day)* 24 * 3600 * 1000);
return c.getTime();
 }

/**
 * 日期相减
 * 
 * @param date
 * 日期
 * @param date1
 * 日期
 * @return 返回相减后的日期
 */
public static int diffDate(java.util.Date date, java.util.Datedate1)
 {
return (int) ((getMillis(date) - getMillis(date1)) / (24 * 3600 *1000));
 }

/**
 * 取得指定月份的第一天
 * 
 * @param strdate
 * String
 * @return String
 */
public static String getMonthBegin(String strdate)
 {
 java.util.Date date =parseDate(strdate);
return format(date, "yyyy-MM") +"-01";
 }

/**
 * 取得指定月份的最后一天
 * 
 * @param strdate
 * String
 * @return String
 */
public static String getMonthEnd(String strdate)
 {
 java.util.Date date =parseDate(getMonthBegin(strdate));
 Calendar calendar =Calendar.getInstance();
calendar.setTime(date);
 calendar.add(Calendar.MONTH,1);
 calendar.add(Calendar.DAY_OF_YEAR,-1);
return formatDate(calendar.getTime());
 }

/**
 * 常用的格式化日期
 * 
 * @param date
 * Date
 * @return String
 */
public static String formatDate(java.util.Date date)
 {
return formatDateByFormat(date,"yyyy-MM-dd");
 }

/**
 * 以指定的格式来格式化日期
 * 
 * @param date
 * Date
 * @param format
 * String
 * @return String
 */
public static String formatDateByFormat(java.util.Date date, Stringformat)
 {
 String result ="";
if (date != null)
 {
try
 {
 SimpleDateFormat sdf = newSimpleDateFormat(format);
 result =sdf.format(date);
 }
catch (Exceptionex)
 {
ex.printStackTrace();
 }
 }
return result;
 }/**
 * Description: 获取GMT8时间
 * @return 将当前时间转换为GMT8时区后的Date
 */
public static Date getGMT8Time(){
 Date gmt8 = null;
try {
 Calendar cal =Calendar.getInstance(TimeZone.getTimeZone("GMT+8"),Locale.CHINESE);
 Calendar day =Calendar.getInstance();
 day.set(Calendar.YEAR,cal.get(Calendar.YEAR));
 day.set(Calendar.MONTH,cal.get(Calendar.MONTH));
 day.set(Calendar.DATE,cal.get(Calendar.DATE));
 day.set(Calendar.HOUR_OF_DAY,cal.get(Calendar.HOUR_OF_DAY));
 day.set(Calendar.MINUTE, cal.get(Calendar.MINUTE));
 day.set(Calendar.SECOND,cal.get(Calendar.SECOND));
 gmt8 =day.getTime();
 } catch (Exception e) {
System.out.println("获取GMT8时间 getGMT8Time() error!");
e.printStackTrace();
 gmt8 = null;
 }
return gmt8;
 }packagecom.sipgl.eam.utils;

importjava.text.SimpleDateFormat;
importjava.util.ArrayList;
importjava.util.Calendar;
importjava.util.Date;
importjava.util.GregorianCalendar;
importjava.util.LinkedHashMap;

/**
* 日期公用处理类
* 
* @author SongJun
* @version 1.3
*/
public class DateUtil {
/**
 * 解析一个日期之间的所有月份
 * 
 * @param beginDateStr
 * @param endDateStr
 * @return
 */
public static ArrayList getMonthList(String beginDateStr, StringendDateStr) {
//指定要解析的时间格式
SimpleDateFormat f =  new SimpleDateFormat("yyyy-MM");
//返回的月份列表
String sRet = "";

//定义一些变量
Date beginDate = null;
 Date endDate = null;

 GregorianCalendar beginGC = null;
 GregorianCalendar endGC = null;
 ArrayList list = newArrayList();

try {
// 将字符串parse成日期
beginDate = f.parse(beginDateStr);
 endDate =f.parse(endDateStr);

// 设置日历
beginGC = new GregorianCalendar();
beginGC.setTime(beginDate);

 endGC = newGregorianCalendar();
endGC.setTime(endDate);

// 直到两个时间相同
while(beginGC.getTime().compareTo(endGC.getTime()) <= 0) {
 sRet =beginGC.get(Calendar.YEAR) + "-"
 +(beginGC.get(Calendar.MONTH) + 1);
list.add(sRet);
// 以月为单位，增加时间
beginGC.add(Calendar.MONTH, 1);
 }
return list;
 } catch (Exception e) {
e.printStackTrace();
return null;
 }
 }

/**
 * 解析一个日期段之间的所有日期
 * 
 * @param beginDateStr
 * 开始日期
 * @param endDateStr
 * 结束日期
 * @return
 */
public static ArrayList getDayList(String beginDateStr, StringendDateStr) {
//指定要解析的时间格式
SimpleDateFormat f =  new SimpleDateFormat("yyyy-MM-dd");

//定义一些变量
Date beginDate = null;
 Date endDate = null;

 Calendar beginGC = null;
 Calendar endGC = null;
 ArrayList list = newArrayList();

try {
// 将字符串parse成日期
beginDate = f.parse(beginDateStr);
 endDate =f.parse(endDateStr);

// 设置日历
beginGC = Calendar.getInstance();
beginGC.setTime(beginDate);

 endGC = Calendar.getInstance();
endGC.setTime(endDate);
 SimpleDateFormat sdf = newSimpleDateFormat("yyyy-MM-dd");

// 直到两个时间相同
while(beginGC.getTime().compareTo(endGC.getTime()) <= 0) {

list.add(sdf.format(beginGC.getTime()));
// 以日为单位，增加时间
beginGC.add(Calendar.DAY_OF_MONTH, 1);
 }
return list;
 } catch (Exception e) {
e.printStackTrace();
return null;
 }
 }

public static ArrayList getYearList() {
 ArrayList list = new ArrayList();
 Calendar c = null;
 c =Calendar.getInstance();
 c.setTime(new Date());
int currYear =Calendar.getInstance().get(Calendar.YEAR);

int startYear = currYear - 5;
int endYear = currYear + 10;
for (int i = startYear; i < endYear; i++) {
 list.add(new Integer(i));
 }
return list;
 }

public static int getCurrYear() {
return Calendar.getInstance().get(Calendar.YEAR);
 }

/**
 * 得到某一年周的总数
 * 
 * @param year
 * @return
 */
public static LinkedHashMap getWeekList(int year) {
 LinkedHashMap map = newLinkedHashMap();
 Calendar c = newGregorianCalendar();
 c.set(year, Calendar.DECEMBER,31, 23, 59, 59);
int count = getWeekOfYear(c.getTime());

 SimpleDateFormat sdf = newSimpleDateFormat("yyyy-MM-dd");
 String dayOfWeekStart ="";
 String dayOfWeekEnd ="";
for (int i = 1; i <= count; i++) {
 dayOfWeekStart =sdf.format(getFirstDayOfWeek(year, i));
 dayOfWeekEnd =sdf.format(getLastDayOfWeek(year, i));
 map.put(new Integer(i),"第"+i+"周(从"+dayOfWeekStart + "至" +dayOfWeekEnd+")");
 }
return map;

 }

/**
 * 得到一年的总周数
 * @param year
 * @return
 */
public static int getWeekCountInYear(int year){
 Calendar c = newGregorianCalendar();
 c.set(year, Calendar.DECEMBER,31, 23, 59, 59);
int count = getWeekOfYear(c.getTime());
return count;
 }

/**
 * 取得当前日期是多少周
 * 
 * @param date
 * @return
 */
public static int getWeekOfYear(Date date) {
 Calendar c = newGregorianCalendar();
c.setFirstDayOfWeek(Calendar.MONDAY);
c.setMinimalDaysInFirstWeek(7);
 c.setTime(date);

return c.get(Calendar.WEEK_OF_YEAR);
 }

/**
 * 得到某年某周的第一天
 * 
 * @param year
 * @param week
 * @return
 */
public static Date getFirstDayOfWeek(int year, int week) {
 Calendar c = newGregorianCalendar();
 c.set(Calendar.YEAR,year);
 c.set(Calendar.MONTH,Calendar.JANUARY);
 c.set(Calendar.DATE,1);

 Calendar cal =(GregorianCalendar) c.clone();
 cal.add(Calendar.DATE, week *7);

return getFirstDayOfWeek(cal.getTime());
 }

/**
 * 得到某年某周的最后一天
 * 
 * @param year
 * @param week
 * @return
 */
public static Date getLastDayOfWeek(int year, int week) {
 Calendar c = newGregorianCalendar();
 c.set(Calendar.YEAR,year);
 c.set(Calendar.MONTH,Calendar.JANUARY);
 c.set(Calendar.DATE,1);

 Calendar cal =(GregorianCalendar) c.clone();
 cal.add(Calendar.DATE, week *7);

return getLastDayOfWeek(cal.getTime());
 }

/**
 * 得到某年某月的第一天
 * @param year
 * @param month
 * @return
 */
public static Date getFirestDayOfMonth(int year,int month){
 month = month-1;
 Calendar c= Calendar.getInstance(); 
 c.set(Calendar.YEAR,year);
 c.set(Calendar.MONTH,month);

int day = c.getActualMinimum(c.DAY_OF_MONTH);

 c.set(Calendar.DAY_OF_MONTH,day);
return c.getTime();

 }

/**
 * 提到某年某月的最后一天
 * @param year
 * @param month
 * @return
 */
public static Date getLastDayOfMonth(int year,int month){
 month = month-1;
 Calendar c= Calendar.getInstance(); 
 c.set(Calendar.YEAR,year);
 c.set(Calendar.MONTH,month);
int day = c.getActualMaximum(c.DAY_OF_MONTH);
 c.set(Calendar.DAY_OF_MONTH,day);
return c.getTime();
 }

/**
 * 取得当前日期所在周的第一天
 * 
 * @param date
 * @return
 */
public static Date getFirstDayOfWeek(Date date) {
 Calendar c = newGregorianCalendar();
c.setFirstDayOfWeek(Calendar.MONDAY);
 c.setTime(date);
 c.set(Calendar.DAY_OF_WEEK,c.getFirstDayOfWeek()); // Monday
 returnc.getTime();
 }

/**
 * 取得当前日期所在周的最后一天
 * 
 * @param date
 * @return
 */
public static Date getLastDayOfWeek(Date date) {
 Calendar c = newGregorianCalendar();
c.setFirstDayOfWeek(Calendar.MONDAY);
 c.setTime(date);
 c.set(Calendar.DAY_OF_WEEK,c.getFirstDayOfWeek() + 6);  // Sunday
 returnc.getTime();
 }

 }
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