package com.css.common.util;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* 用于处理JAVA中的DATE型数据的转换
*
* @version 1.0
*/
public class DateUtil {
private static Log log = LogFactory.getLog(DateUtil.class);
private static String datePattern = "yyyy-MM-dd";
private static String timePattern = "HH:mm:ss";
/**
* Return 缺省的日期格式 (yyyy-MM-dd)
*
* @return 在页面中显示的日期格式
*/
public static String getDatePattern() {
return datePattern;
}
/**
* Return 缺省的时间格式 (HH:mm:ss)
*
* @return 在页面中显示的日期格式
*/
public static final String getTimePattern() {
return timePattern;
}
/**
* Return 缺省的日期+时间格式 (yyyy-MM-dd HH:mm:ss)
*
* @return 在页面中显示的日期格式
*/
public static final String getDateTimePattern() {
return datePattern + " " +timePattern;
}
/**
* 按照日期格式，将字符串解析为日期对象
*
* @param aMask
* 输入字符串的格式
* @param strDate
* 按aMask格式排列的日期的字符串描述
* @return Date 对象
*
* @throws ParseException
*/
public static final Date convertStringToDate(String aMask, String strDate){
SimpleDateFormat df = null;
Date chgDate = null;
try {
df = new SimpleDateFormat(aMask);
chgDate = df.parse(strDate);
} catch (ParseException pe) {
log.error("from string convert to date is error :"+pe.getMessage());
}
return chgDate;
}
/**
* 按照日期格式，将字符串解析为日期对象.格式'yyyy-mm-dd HH:mm:ss'
*
* @param strDate
* 按aMask格式排列的日期的字符串描述
* @return Date 对象
*/
public static final Date convertStringToDate(String strDate){
return convertStringToDate(getDateTimePattern(),strDate);
}
/**
* 按照日期格式，将日期对象解析为字符串
*
* @param aMask
* 输入字符串的格式
* @param aDate
* 按aMask格式排列的日期对象
* @return String 字符串
*
* @throws ParseException
*/
public static String convertDateToString(String aMask, Date aDate){
SimpleDateFormat df = null;
try {
df = new SimpleDateFormat(aMask);
}catch(Exception ex){
log.error("from date convert to string is error :"+ex.getMessage());
}
return df.format(aDate);
}
/**
* 按照日期格式，将日期对象解析为字符串.格式'yyyy-mm-dd HH:mm:ss'
*
* @param strDate
* 按aMask格式排列的日期的字符串描述
* @return Date 对象
*/
public static final String convertDateToString(Date aDate){
return convertDateToString(getDateTimePattern(),aDate);
}
/**
* 返回当前日期
*
* @param aMask 日期格式
*
* @return
*/
public static String getLocalDateTime(String aMask) {
SimpleDateFormat df = new SimpleDateFormat(aMask);
String returnValue = df.format(new Date());
return returnValue;
}
/**
* 返回当前日期，格式'yyyy-mm-dd'
*
* @return
*/
public static String getLocalDate() {
return getLocalDateTime(getDatePattern());
}
/**
* 返回当前时间，格式'yyyy-mm-dd HH:mm:ss'
*
* @return
*/
public static final String getLocalDateTime() {
return getLocalDateTime(getDateTimePattern());
}
/**
* 返回当前日期
*
* @param aMask 日期格式
*
* @return
*/
public static Date loadLocalDateTime(String aMask) {
return convertStringToDate(aMask, getLocalDateTime(aMask));
}
/**
* 返回当前日期，格式'yyyy-mm-dd'
*
* @return
*/
public static Date loadLocalDate() {
return loadLocalDateTime(getDatePattern());
}
/**
* 返回当前时间，格式'yyyy-mm-dd HH:mm:ss'
*
* @return
*/
public static final Date loadLocalDateTime() {
return loadLocalDateTime(getDateTimePattern());
}
/**
* 得到日历对象Calendar，格式：yyyy-MM-dd
*
* @return the current date
* @throws ParseException
*/
public static Calendar getCalendar() throws ParseException {
Date today = new Date();
SimpleDateFormat df = new SimpleDateFormat(datePattern);
String todayAsString = df.format(today);
Calendar cal = new GregorianCalendar();
cal.setTime(convertStringToDate(getDatePattern(),todayAsString));
return cal;
}
public static String getYear() {
Date date = new Date();
return convertDateToString("yyyy", date);
}
public static String getMonth() {
Date date = new Date();
return convertDateToString("MM", date);
}
public static String getDay() {
Date date = new Date();
return convertDateToString("dd", date);
}
/**
* 日期增大
* @param date
* Date
* @param field
* int 1年 2月 3周 5天
* @param amount
* int 增加数量
* @return Date
*/
public static Date addDate(Date date, int field, int amount) {
GregorianCalendar gc = new GregorianCalendar();
gc.setTime(date);
gc.add(field, amount);
return gc.getTime();
}
/**
* 得到Calendar的TimeInMilli
*
* @param date
* @return
*/
public static long getMillis(Date date) {
if (date != null) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.getTimeInMillis();
} else {
return 0;
}
}
/**
* 日期相减
*
* @param date
* Date
* @param day
* int
* @return Date
*/
public static Date diffDate(Date date, int day) {
if (date != null) {
Calendar c = Calendar.getInstance();
long iLong = getMillis(date) - ((long) day) * 24 * 3600 * 1000;
c.setTimeInMillis(iLong);
return c.getTime();
} else {
return new Date();
}
}
/**
* 得到一年当中的星期
*
* @param date
* @return
*/
public static String getWeekOfYearByString(Date date) {
if (date != null) {
Calendar c = new GregorianCalendar();
c.setFirstDayOfWeek(Calendar.MONDAY);
c.setMinimalDaysInFirstWeek(7);
c.setTime(date);
int week = c.get(Calendar.WEEK_OF_YEAR);
if (week > 9) {
return convertDateToString("yyyy", date) + week;
} else {
return convertDateToString("yyyy", date) + "0" + week;
}
} else {
return null;
}
}
/**
* 获取某月的第一天，或最后一天
*
* @param date
* Date
* @param flag
* boolean true为第一天 false为最后一天
* @return String
*/
public static final String getDateByMonth(Date date, boolean flag) {
Calendar cal = Calendar.getInstance();
cal.setTime(date);
int i = 0;
if (flag) {
i = cal.getActualMinimum(Calendar.DAY_OF_MONTH);
} else {
i = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
}
if (i > 9) {
return i + "";
} else {
return "0" + i;
}
}
/**
* 获取某周的第一天，或最后一天
*
* @param year
* int
* @param week
* int
* @param flag
* boolean true为第一天 false为最后一天
* @return Date
*/
public static Date getDateByWeek(int year, int week, boolean flag) {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.YEAR, year);
calendar.set(Calendar.WEEK_OF_YEAR, week);
calendar.set(Calendar.DAY_OF_WEEK, 7);
// 得到今天是星期几，星期日为1
int datInWeek = calendar.get(Calendar.DAY_OF_WEEK);
System.out.println(datInWeek);
// Clone一个新的
Calendar calendar1 = (Calendar) calendar.clone();
if (flag) {
calendar.add(Calendar.DAY_OF_MONTH, -(datInWeek - 2));
return calendar.getTime();
} else {
calendar1.add(Calendar.DAY_OF_MONTH, 7 - datInWeek);
return addDate(calendar.getTime(), 5, 1);
}
}
/**
* 日期计算
*
* @param date
* 起始日期
* @param yearNum
* 年增减数
* @param monthNum
* 月增减数
* @param dateNum
* 日增减数
*/
public static String calDate(String date, int yearNum, int monthNum,
int dateNum) {
String result = "";
try {
SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd");
Calendar cal = Calendar.getInstance();
cal.setTime(sd.parse(date));
cal.add(Calendar.MONTH, monthNum);
cal.add(Calendar.YEAR, yearNum);
cal.add(Calendar.DATE, dateNum);
result = sd.format(cal.getTime());
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/**
* 得到系统时间数字：1260168985734
* @return
*/
public static long getLongTime(){
return System.currentTimeMillis();
}
/**
* 得到系统时间数字：1260168985734
* @return
*/
public static String getLongDate(){
long d = System.currentTimeMillis();
return String.valueOf(d);
}
public static void main(String[] args) {
}
}
