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JAVA获取时间的方式

package com.qunar.date;
 
import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.*;
 
/**
 * Created by liugen.xu on 2015/8/4.
 */
public class DateGenerate {
  /**
   * 获取现在时间
   *
   * @return 返回时间类型 yyyy-MM-dd HH:mm:ss
   */
  public static Date getNowDate() {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String dateString = formatter.format(currentTime);
    ParsePosition pos = new ParsePosition(8);
    Date currentTime_2 = formatter.parse(dateString, pos);
    return currentTime_2;
  }
 
  /**
   * 获取现在时间
   *
   * @return返回短时间格式 yyyy-MM-dd
   */
  public static Date getNowDateShort() {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    String dateString = formatter.format(currentTime);
    ParsePosition pos = new ParsePosition(8);
    Date currentTime_2 = formatter.parse(dateString, pos);
    return currentTime_2;
  }
 
  /**
   * 获取现在时间
   *
   * @return返回字符串格式 yyyy-MM-dd HH:mm:ss
   */
  public static String getStringDate() {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String dateString = formatter.format(currentTime);
    return dateString;
  }
 
  /**
   * 获取现在时间
   *
   * @return 返回短时间字符串格式yyyy-MM-dd
   */
  public static String getStringDateShort() {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    String dateString = formatter.format(currentTime);
    return dateString;
  }
 
  /**
   * 获取时间 小时:分;秒 HH:mm:ss
   *
   * @return
   */
  public static String getTimeShort() {
    SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss");
    Date currentTime = new Date();
    String dateString = formatter.format(currentTime);
    return dateString;
  }
 
  /**
   * 将长时间格式字符串转换为时间 yyyy-MM-dd HH:mm:ss
   *
   * @param strDate
   * @return
   */
  public static Date strToDateLong(String strDate) {
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    ParsePosition pos = new ParsePosition(0);
    Date strtodate = formatter.parse(strDate, pos);
    return strtodate;
  }
 
  /**
   * 将长时间格式时间转换为字符串 yyyy-MM-dd HH:mm:ss
   *
   * @param dateDate
   * @return
   */
  public static String dateToStrLong(java.util.Date dateDate) {
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String dateString = formatter.format(dateDate);
    return dateString;
  }
 
  /**
   * 将短时间格式时间转换为字符串 yyyy-MM-dd
   *
   * @param dateDate
   * @return
   */
  public static String dateToStr(java.util.Date dateDate) {
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    String dateString = formatter.format(dateDate);
    return dateString;
  }
 
  /**
   * 将短时间格式字符串转换为时间 yyyy-MM-dd
   *
   * @param strDate
   * @return
   */
  public static Date strToDate(String strDate) {
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    ParsePosition pos = new ParsePosition(0);
    Date strtodate = formatter.parse(strDate, pos);
    return strtodate;
  }
 
  /**
   * 得到现在时间
   *
   * @return
   */
  public static Date getNow() {
    Date currentTime = new Date();
    return currentTime;
  }
 
  /**
   * 提取一个月中的最后一天
   *
   * @param day
   * @return
   */
  public static Date getLastDate(long day) {
    Date date = new Date();
    long date_3_hm = date.getTime() - 3600000 * 34 * day;
    Date date_3_hm_date = new Date(date_3_hm);
    return date_3_hm_date;
  }
 
  /**
   * 得到现在时间
   *
   * @return 字符串 yyyyMMdd HHmmss
   */
  public static String getStringToday() {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd HHmmss");
    String dateString = formatter.format(currentTime);
    return dateString;
  }
 
  /**
   * 得到现在小时
   */
  public static String getHour() {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String dateString = formatter.format(currentTime);
    String hour;
    hour = dateString.substring(11, 13);
    return hour;
  }
 
  /**
   * 得到现在分钟
   *
   * @return
   */
  public static String getTime() {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String dateString = formatter.format(currentTime);
    String min;
    min = dateString.substring(14, 16);
    return min;
  }
 
  /**
   * 根据用户传入的时间表示格式，返回当前时间的格式 如果是yyyyMMdd，注意字母y不能大写。
   *
   * @param sformat yyyyMMddhhmmss
   * @return
   */
  public static String getUserDate(String sformat) {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat(sformat);
    String dateString = formatter.format(currentTime);
    return dateString;
  }
 
  /**
   * 二个小时时间间的差值,必须保证二个时间都是"HH:MM"的格式，返回字符型的分钟
   */
  public static String getTwoHour(String st1, String st2) {
    String[] kk = null;
    String[] jj = null;
    kk = st1.split(":");
    jj = st2.split(":");
    if (Integer.parseInt(kk[0]) < Integer.parseInt(jj[0]))
      return "0";
    else {
      double y = Double.parseDouble(kk[0]) + Double.parseDouble(kk[1]) / 60;
      double u = Double.parseDouble(jj[0]) + Double.parseDouble(jj[1]) / 60;
      if ((y - u) > 0)
        return y - u + "";
      else
        return "0";
    }
  }
 
  /**
   * 得到二个日期间的间隔天数
   */
  public static String getTwoDay(String sj1, String sj2) {
    SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
    long day = 0;
    try {
      java.util.Date date = myFormatter.parse(sj1);
      java.util.Date mydate = myFormatter.parse(sj2);
      day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
    } catch (Exception e) {
      return "";
    }
    return day + "";
  }
 
  /**
   * 时间前推或后推分钟,其中JJ表示分钟.
   */
  public static String getPreTime(String sj1, String jj) {
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String mydate1 = "";
    try {
      Date date1 = format.parse(sj1);
      long Time = (date1.getTime() / 1000) + Integer.parseInt(jj) * 60;
      date1.setTime(Time * 1000);
      mydate1 = format.format(date1);
    } catch (Exception e) {
    }
    return mydate1;
  }
 
  /**
   * 得到一个时间延后或前移几天的时间,nowdate为时间,delay为前移或后延的天数
   */
  public static String getNextDay(String nowdate, String delay) {
    try {
      SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
      String mdate = "";
      Date d = strToDate(nowdate);
      long myTime = (d.getTime() / 1000) + Integer.parseInt(delay) * 24 * 60 * 60;
      d.setTime(myTime * 1000);
      mdate = format.format(d);
      return mdate;
    } catch (Exception e) {
      return "";
    }
  }
 
  /**
   * 判断是否润年
   *
   * @param ddate
   * @return
   */
  public static boolean isLeapYear(String ddate) {
 
    /**
     * 详细设计： 1.被400整除是闰年，否则： 2.不能被4整除则不是闰年 3.能被4整除同时不能被100整除则是闰年
     * 3.能被4整除同时能被100整除则不是闰年
     */
    Date d = strToDate(ddate);
    GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
    gc.setTime(d);
    int year = gc.get(Calendar.YEAR);
    if ((year % 400) == 0)
      return true;
    else if ((year % 4) == 0) {
      if ((year % 100) == 0)
        return false;
      else
        return true;
    } else
      return false;
  }
 
  /**
   * 返回美国时间格式 26 Apr 2006
   *
   * @param str
   * @return
   */
  public static String getEDate(String str) {
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    ParsePosition pos = new ParsePosition(0);
    Date strtodate = formatter.parse(str, pos);
    String j = strtodate.toString();
    String[] k = j.split(" ");
    return k[2] + k[1].toUpperCase() + k[5].substring(2, 4);
  }
 
  /**
   * 获取一个月的最后一天
   *
   * @param dat
   * @return
   */
  public static String getEndDateOfMonth(String dat) {// yyyy-MM-dd
    String str = dat.substring(0, 8);
    String month = dat.substring(5, 7);
    int mon = Integer.parseInt(month);
    if (mon == 1 || mon == 3 || mon == 5 || mon == 7 || mon == 8 || mon == 10 || mon == 12) {
      str += "31";
    } else if (mon == 4 || mon == 6 || mon == 9 || mon == 11) {
      str += "30";
    } else {
      if (isLeapYear(dat)) {
        str += "29";
      } else {
        str += "28";
      }
    }
    return str;
  }
 
  /**
   * 判断二个时间是否在同一个周
   *
   * @param date1
   * @param date2
   * @return
   */
  public static boolean isSameWeekDates(Date date1, Date date2) {
    Calendar cal1 = Calendar.getInstance();
    Calendar cal2 = Calendar.getInstance();
    cal1.setTime(date1);
    cal2.setTime(date2);
    int subYear = cal1.get(Calendar.YEAR) - cal2.get(Calendar.YEAR);
    if (0 == subYear) {
      if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR))
        return true;
    } else if (1 == subYear && 11 == cal2.get(Calendar.MONTH)) {
      // 如果12月的最后一周横跨来年第一周的话则最后一周即算做来年的第一周
      if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR))
        return true;
    } else if (-1 == subYear && 11 == cal1.get(Calendar.MONTH)) {
      if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR))
        return true;
    }
    return false;
  }
 
  /**
   * 产生周序列,即得到当前时间所在的年度是第几周
   *
   * @return
   */
  public static String getSeqWeek() {
    Calendar c = Calendar.getInstance(Locale.CHINA);
    String week = Integer.toString(c.get(Calendar.WEEK_OF_YEAR));
    if (week.length() == 1)
      week = "0" + week;
    String year = Integer.toString(c.get(Calendar.YEAR));
    return year + week;
  }
 
  /**
   * 获得一个日期所在的周的星期几的日期，如要找出2002年2月3日所在周的星期一是几号
   *
   * @param sdate
   * @param num
   * @return
   */
  public static String getWeek(String sdate, String num) {
    // 再转换为时间
    Date dd = DateGenerate.strToDate(sdate);
    Calendar c = Calendar.getInstance();
    c.setTime(dd);
    if (num.equals("1")) // 返回星期一所在的日期
      c.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
    else if (num.equals("2")) // 返回星期二所在的日期
      c.set(Calendar.DAY_OF_WEEK, Calendar.TUESDAY);
    else if (num.equals("3")) // 返回星期三所在的日期
      c.set(Calendar.DAY_OF_WEEK, Calendar.WEDNESDAY);
    else if (num.equals("4")) // 返回星期四所在的日期
      c.set(Calendar.DAY_OF_WEEK, Calendar.THURSDAY);
    else if (num.equals("5")) // 返回星期五所在的日期
      c.set(Calendar.DAY_OF_WEEK, Calendar.FRIDAY);
    else if (num.equals("6")) // 返回星期六所在的日期
      c.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY);
    else if (num.equals("0")) // 返回星期日所在的日期
      c.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
    return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());
  }
 
  /**
   * 根据一个日期，返回是星期几的字符串
   *
   * @param sdate
   * @return
   */
  public static String getWeek(String sdate) {
    // 再转换为时间
    Date date = DateGenerate.strToDate(sdate);
    Calendar c = Calendar.getInstance();
    c.setTime(date);
    // int hour=c.get(Calendar.DAY_OF_WEEK);
    // hour中存的就是星期几了，其范围 1~7
    // 1=星期日 7=星期六，其他类推
    return new SimpleDateFormat("EEEE").format(c.getTime());
  }
 
  public static String getWeekStr(String sdate) {
    String str = "";
    str = DateGenerate.getWeek(sdate);
    if ("1".equals(str)) {
      str = "星期日";
    } else if ("2".equals(str)) {
      str = "星期一";
    } else if ("3".equals(str)) {
      str = "星期二";
    } else if ("4".equals(str)) {
      str = "星期三";
    } else if ("5".equals(str)) {
      str = "星期四";
    } else if ("6".equals(str)) {
      str = "星期五";
    } else if ("7".equals(str)) {
      str = "星期六";
    }
    return str;
  }
 
  /**
   * 两个时间之间的天数
   *
   * @param date1
   * @param date2
   * @return
   */
  public static long getDays(String date1, String date2) {
    if (date1 == null || date1.equals(""))
      return 0;
    if (date2 == null || date2.equals(""))
      return 0;
    // 转换为标准时间
    SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
    java.util.Date date = null;
    java.util.Date mydate = null;
    try {
      date = myFormatter.parse(date1);
      mydate = myFormatter.parse(date2);
    } catch (Exception e) {
    }
    long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
    return day;
  }
 
  /**
   * 形成如下的日历 ， 根据传入的一个时间返回一个结构 星期日 星期一 星期二 星期三 星期四 星期五 星期六 下面是当月的各个时间
   * 此函数返回该日历第一行星期日所在的日期
   *
   * @param sdate
   * @return
   */
  public static String getNowMonth(String sdate) {
    // 取该时间所在月的一号
    sdate = sdate.substring(0, 8) + "01";
 
    // 得到这个月的1号是星期几
    Date date = DateGenerate.strToDate(sdate);
    Calendar c = Calendar.getInstance();
    c.setTime(date);
    int u = c.get(Calendar.DAY_OF_WEEK);
    String newday = DateGenerate.getNextDay(sdate, (1 - u) + "");
    return newday;
  }
 
  /**
   * 取得数据库主键 生成格式为yyyymmddhhmmss+k位随机数
   *
   * @param k 表示是取几位随机数，可以自己定
   */
 
  public static String getNo(int k) {
 
    return getUserDate("yyyyMMddhhmmss") + getRandom(k);
  }
 
  /**
   * 返回一个随机数
   *
   * @param i
   * @return
   */
  public static String getRandom(int i) {
    Random jjj = new Random();
    // int suiJiShu = jjj.nextInt(9);
    if (i == 0)
      return "";
    String jj = "";
    for (int k = 0; k < i; k++) {
      jj = jj + jjj.nextInt(9);
    }
    return jj;
  }
 
  /**
   */
  public static boolean RightDate(String date) {
 
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
    ;
    if (date == null)
      return false;
    if (date.length() > 10) {
      sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
    } else {
      sdf = new SimpleDateFormat("yyyy-MM-dd");
    }
    try {
      sdf.parse(date);
    } catch (ParseException pe) {
      return false;
    }
    return true;
  }
 
  /**
   * ************************************************************************
   * //nd=1表示返回的值中包含年度 //yf=1表示返回的值中包含月份 //rq=1表示返回的值中包含日期 //format表示返回的格式 1
   * 以年月日中文返回 2 以横线-返回 // 3 以斜线/返回 4 以缩写不带其它符号形式返回 // 5 以点号.返回
   * ************************************************************************
   */
  public static String getStringDateMonth(String sdate, String nd, String yf, String rq, String format) {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    String dateString = formatter.format(currentTime);
    String s_nd = dateString.substring(0, 4); // 年份
    String s_yf = dateString.substring(5, 7); // 月份
    String s_rq = dateString.substring(8, 10); // 日期
    String sreturn = "";
    roc.util.MyChar mc = new roc.util.MyChar();
    if (sdate == null || sdate.equals("") || !mc.Isdate(sdate)) { // 处理空值情况
      if (nd.equals("1")) {
        sreturn = s_nd;
        // 处理间隔符
        if (format.equals("1"))
          sreturn = sreturn + "年";
        else if (format.equals("2"))
          sreturn = sreturn + "-";
        else if (format.equals("3"))
          sreturn = sreturn + "/";
        else if (format.equals("5"))
          sreturn = sreturn + ".";
      }
      // 处理月份
      if (yf.equals("1")) {
        sreturn = sreturn + s_yf;
        if (format.equals("1"))
          sreturn = sreturn + "月";
        else if (format.equals("2"))
          sreturn = sreturn + "-";
        else if (format.equals("3"))
          sreturn = sreturn + "/";
        else if (format.equals("5"))
          sreturn = sreturn + ".";
      }
      // 处理日期
      if (rq.equals("1")) {
        sreturn = sreturn + s_rq;
        if (format.equals("1"))
          sreturn = sreturn + "日";
      }
    } else {
      // 不是空值，也是一个合法的日期值，则先将其转换为标准的时间格式
      sdate = roc.util.RocDate.getOKDate(sdate);
      s_nd = sdate.substring(0, 4); // 年份
      s_yf = sdate.substring(5, 7); // 月份
      s_rq = sdate.substring(8, 10); // 日期
      if (nd.equals("1")) {
        sreturn = s_nd;
        // 处理间隔符
        if (format.equals("1"))
          sreturn = sreturn + "年";
        else if (format.equals("2"))
          sreturn = sreturn + "-";
        else if (format.equals("3"))
          sreturn = sreturn + "/";
        else if (format.equals("5"))
          sreturn = sreturn + ".";
      }
      // 处理月份
      if (yf.equals("1")) {
        sreturn = sreturn + s_yf;
        if (format.equals("1"))
          sreturn = sreturn + "月";
        else if (format.equals("2"))
          sreturn = sreturn + "-";
        else if (format.equals("3"))
          sreturn = sreturn + "/";
        else if (format.equals("5"))
          sreturn = sreturn + ".";
      }
      // 处理日期
      if (rq.equals("1")) {
        sreturn = sreturn + s_rq;
        if (format.equals("1"))
          sreturn = sreturn + "日";
      }
    }
    return sreturn;
  }
 
  public static String getNextMonthDay(String sdate, int m) {
    sdate = getOKDate(sdate);
    int year = Integer.parseInt(sdate.substring(0, 4));
    int month = Integer.parseInt(sdate.substring(5, 7));
    month = month + m;
    if (month < 0) {
      month = month + 12;
      year = year - 1;
    } else if (month > 12) {
      month = month - 12;
      year = year + 1;
    }
    String smonth = "";
    if (month < 10)
      smonth = "0" + month;
    else
      smonth = "" + month;
    return year + "-" + smonth + "-10";
  }
 
  public static String getOKDate(String sdate) {
    if (sdate == null || sdate.equals(""))
      return getStringDateShort();
 
    if (!VeStr.Isdate(sdate)) {
      sdate = getStringDateShort();
    }
    // 将“/”转换为“-”
    sdate = VeStr.Replace(sdate, "/", "-");
    // 如果只有8位长度，则要进行转换
    if (sdate.length() == 8)
      sdate = sdate.substring(0, 4) + "-" + sdate.substring(4, 6) + "-" + sdate.substring(6, 8);
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    ParsePosition pos = new ParsePosition(0);
    Date strtodate = formatter.parse(sdate, pos);
    String dateString = formatter.format(strtodate);
    return dateString;
  }
 
  public static void main(String[] args) throws Exception {
    try {
      //System.out.print(Integer.valueOf(getTwoDay("2006-11-03 12:22:10", "2006-11-02 11:22:09")));
    } catch (Exception e) {
      throw new Exception();
    }
    //System.out.println("sss");
  }
}
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原文地址：https://www.cnblogs.com/lykbk/p/aesfsedfsf4w5r4354.html