TimeUtil 工具

最新推荐文章于 2023-02-02 10:43:52 发布

转载最新推荐文章于 2023-02-02 10:43:52 发布 · 2.4k 阅读

文章标签：

#date #calendar #string #exception #null #c

本文介绍了一个实用的Java日期时间工具类，提供了多种日期时间转换、格式化及计算的方法。包括字符串与各种日期类型的相互转换、获取指定日期的详细组成部分、获取当前日期的指定格式字符串等。

转帖自http://blog.sina.com.cn/xiaohei200

package com.xh.utils.time;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

import com.sun.org.apache.xerces.internal.impl.xpath.regex.ParseException;

public class TimeUtil {

// ---当前日期的年，月，日，时，分，秒
public static Calendar now = Calendar.getInstance();
int year = now.get(Calendar.YEAR);
int date = now.get(Calendar.DAY_OF_MONTH);
int month = now.get(Calendar.MONTH) + 1;
int hour = now.get(Calendar.HOUR);
int min = now.get(Calendar.MINUTE);
int sec = now.get(Calendar.SECOND);

// -------------------------------日期类型转换---------------------------------------------------------------------------

public static java.util.Date toUtilDateFromStrDateByFormat(
   String p_strDate, String p_format) throws Exception {
  java.util.Date l_date = null;
  java.text.DateFormat df = new java.text.SimpleDateFormat(p_format);
  if (p_strDate != null && (!"".equals(p_strDate)) && p_format != null
    && (!"".equals(p_format))) {
   l_date = df.parse(p_strDate);
  }
  return l_date;
}

public static java.sql.Date toSqlDateFromStrDate(String p_strDate)
   throws Exception {
  java.sql.Date returnDate = null;
  java.text.DateFormat sdf = new java.text.SimpleDateFormat();
  if (p_strDate != null && (!"".equals(p_strDate))) {
   returnDate = new java.sql.Date(sdf.parse(p_strDate).getTime());
  }
  return returnDate;
}

public static String toStrDateFromUtilDateByFormat(
   java.util.Date p_utilDate, String p_format) throws ParseException {
  String l_result = "";
  if (p_utilDate != null) {
   SimpleDateFormat sdf = new SimpleDateFormat(p_format);
   l_result = sdf.format(p_utilDate);
  }
  return l_result;
}

public static Calendar toCalendarFromUtilDate(java.util.Date p_utilDate) {
  Calendar c = Calendar.getInstance();
  c.setTime(p_utilDate);
  return c;
}

public static java.sql.Date toSqlDateFromUtilDate(java.util.Date p_utilDate) {
  java.sql.Date returnDate = null;
  if (p_utilDate != null) {
   returnDate = new java.sql.Date(p_utilDate.getTime());
  }
  return returnDate;
}

public static java.sql.Time toSqlTimeFromUtilDate(java.util.Date p_utilDate) {
  java.sql.Time returnDate = null;
  if (p_utilDate != null) {
   returnDate = new java.sql.Time(p_utilDate.getTime());
  }
  return returnDate;
}

public static java.sql.Timestamp toSqlTimestampFromUtilDate(
   java.util.Date p_utilDate) {
  java.sql.Timestamp returnDate = null;
  if (p_utilDate != null) {
   returnDate = new java.sql.Timestamp(p_utilDate.getTime());
  }
  return returnDate;
}

public static java.util.Date toUtilDateFromSqlDate(java.sql.Date p_sqlDate) {
  java.util.Date returnDate = null;
  if (p_sqlDate != null) {
   returnDate = new java.util.Date(p_sqlDate.getTime());
  }
  return returnDate;
}

// -----------------获取指定日期的年份，月份，日份，小时，分，秒，毫秒----------------------------

public static int getYearOfDate(java.util.Date p_date) {
  java.util.Calendar c = java.util.Calendar.getInstance();
  c.setTime(p_date);
  return c.get(java.util.Calendar.YEAR);
}

public static int getMonthOfDate(java.util.Date p_date) {
  java.util.Calendar c = java.util.Calendar.getInstance();
  c.setTime(p_date);
  return c.get(java.util.Calendar.MONTH) + 1;
}

public static int getDayOfDate(java.util.Date p_date) {
  java.util.Calendar c = java.util.Calendar.getInstance();
  c.setTime(p_date);
  return c.get(java.util.Calendar.DAY_OF_MONTH);
}

public static int getHourOfDate(java.util.Date p_date) {
  java.util.Calendar c = java.util.Calendar.getInstance();
  c.setTime(p_date);
  return c.get(java.util.Calendar.HOUR_OF_DAY);
}

public static int getMinuteOfDate(java.util.Date p_date) {
  java.util.Calendar c = java.util.Calendar.getInstance();
  c.setTime(p_date);
  return c.get(java.util.Calendar.MINUTE);
}

public static int getSecondOfDate(java.util.Date p_date) {
  java.util.Calendar c = java.util.Calendar.getInstance();
  c.setTime(p_date);
  return c.get(java.util.Calendar.SECOND);
}

public static long getMillisOfDate(java.util.Date p_date) {
  java.util.Calendar c = java.util.Calendar.getInstance();
  c.setTime(p_date);
  return c.getTimeInMillis();
}

// -----------------获取当前/系统日期(指定日期格式)-----------------------------------------------------------------------------------

public static String getNowOfDateByFormat(String p_format){
  Date d = new Date();
  SimpleDateFormat sdf = new SimpleDateFormat(p_format);
  String dateStr = sdf.format(d);
  return dateStr;
}

public static String getSystemOfDateByFormat(String p_format) {
  long time = System.currentTimeMillis();
  Date d2 = new Date();
  Date d = new Date(time);
  SimpleDateFormat sdf = new SimpleDateFormat(p_format);
  String dateStr = sdf.format(d);
  return dateStr;
}

public static long getDayOfMonth(Date p_date) throws ParseException {
  int year = getYearOfDate(p_date);
  int month = getMonthOfDate(p_date) - 1;
  int day = getDayOfDate(p_date);
  int hour = getHourOfDate(p_date);
  int minute = getMinuteOfDate(p_date);
  int second = getSecondOfDate(p_date);
  Calendar l_calendar = new GregorianCalendar(year, month, day, hour,
    minute, second);
  return l_calendar.getActualMaximum(l_calendar.DAY_OF_MONTH);
}

// -----------------获取指定月份的第一天,最后一天
// ---------------------------------------------------------------------------

public static String getDateOfMonthBegin(String p_strDate, String p_format)
   throws Exception {
  java.util.Date date = toUtilDateFromStrDateByFormat(p_strDate, p_format);
  return toStrDateFromUtilDateByFormat(date, "yyyy-MM") + "-01";
}

public static String getDateOfMonthEnd(String p_strDate, String p_format)
   throws Exception {
  java.util.Date date = toUtilDateFromStrDateByFormat(
    getDateOfMonthBegin(p_strDate, p_format), p_format);
  Calendar calendar = Calendar.getInstance();
  calendar.setTime(date);
  calendar.add(Calendar.MONTH, 1);
  calendar.add(Calendar.DAY_OF_YEAR, -1);
  return toStrDateFromUtilDateByFormat(calendar.getTime(), p_format);
}

// ----------------------日期计算---------------------------------------------------------------------------------

public static boolean isStartDateBeforeEndDate(Date p_startDate,
   Date p_endDate) throws ParseException {
  long l_startTime = getMillisOfDate(p_startDate);
  long l_endTime = getMillisOfDate(p_endDate);
  return (l_startTime - l_endTime > (long) 0) ? true : false;
}

public static void main(String[] args) {
  TimeUtil.getNowOfDateByFormat("yyyy-MM-dd hh:mm:ss EE");
  System.out.println(TimeUtil.getNowOfDateByFormat("yyyy-MM-dd HH:mm:ss"));
}

}