另一开源库Joda-Time
获取各种时间的工具类（项目中实用）
Java日期操作工具类：DateUtil
package myUtil;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.LinkedHashMap;
public class TimeUtil {
/**
* 解析一个日期之间的所有月份
*
* @param beginDateStr
* @param endDateStr
* @return
*/
public static ArrayList getMonthList(String beginDateStr,
String endDateStr) {
// 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 = new ArrayList();
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 = new GregorianCalendar();
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,
String endDateStr) {
// 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 = new ArrayList();
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 = new SimpleDateFormat("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 = new LinkedHashMap();
Calendar c = new GregorianCalendar();
c.set(year, Calendar.DECEMBER, 31, 23, 59, 59);
int count = getWeekOfYear(c.getTime());
SimpleDateFormat sdf = new SimpleDateFormat("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 = new GregorianCalendar();
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 = new GregorianCalendar();
c.setFirstDayOfWeek(Calendar.SUNDAY);
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 = new GregorianCalendar();
c.set(Calendar.YEAR, year);
c.set(Calendar.MONDAY, 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 = new GregorianCalendar();
c.set(Calendar.YEAR, year);
c.set(Calendar.MONDAY, 0);
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);
@SuppressWarnings("static-access")
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);
@SuppressWarnings("static-access")
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 = new GregorianCalendar();
c.setFirstDayOfWeek(Calendar.SUNDAY);
c.setTime(date);
c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek()); // Monday
return c.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 = new GregorianCalendar();
c.setFirstDayOfWeek(Calendar.SUNDAY);
c.setTime(date);
c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek() + 6); // Sunday
return c.getTime();
}
/**
* 得到某年某季度第一天
*
* @param year
* @param quarter
* @return
*/
public static Date getFirstDayOfQuarter(int year, int quarter) {
int month = 0;
if (quarter > 4) {
return null;
} else {
month = (quarter - 1) * 3 + 1;
}
return getFirstDayOfMonth(year, month);
}
/**
* 得到某年某季度最后一天
*
* @param year
* @param quarter
* @return
*/
public static Date getLastDayOfQuarter(int year, int quarter) {
int month = 0;
if (quarter > 4) {
return null;
} else {
month = quarter * 3;
}
return getLastDayOfMonth(year, month);
}
/**
* 得到某年第一天
*
* @param year
* @return
*/
public static Date getFirstDayOfYear(int year) {
return getFirstDayOfQuarter(year, 1);
}
/**
* 得到某年最后一天
*
* @param year
* @return
*/
public static Date getLastDayOfYear(int year) {
return getLastDayOfQuarter(year, 4);
}
/**
* 得到某年某月的第一天
*
* @param year
* @param month
* @return
*/
public static Date getFirstDayOfMonth(int year, int month) {
Calendar c = Calendar.getInstance();
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, month - 1);
c.set(Calendar.DAY_OF_MONTH, c.getActualMinimum(Calendar.DAY_OF_MONTH));
return c.getTime();
}
/**
* 获取某年某月某一周的第一天和最后一天（flag=true表示取第一天）
*
* @param year
* @param month
* @param week
* @param flag
* @return
*/
public static String getDayByWeek(int year, int month, int week,
boolean flag) {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, year);
cal.set(Calendar.MONTH, month - 1);
cal.set(Calendar.WEEK_OF_MONTH, week);
int dw = cal.get(Calendar.DAY_OF_WEEK);
if (!flag)
cal.setTimeInMillis(cal.getTimeInMillis() + (8 - dw) * 24 * 60 * 60
* 1000);
else
cal.setTimeInMillis(cal.getTimeInMillis() - (dw - 2) * 24 * 60 * 60
* 1000);
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
String showTime = formatter.format(cal.getTime());
return showTime.toString();
}
public static String getStringToDate(Date date) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
return sdf.format(date);
}
/**
* 转化字符串时间格式
*
* @param strTime
* @return
* @throws ParseException
*/
public static String formatTimeString(String strTime) throws ParseException {
SimpleDateFormat getsdf = new SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss.sss");
SimpleDateFormat resdf = new SimpleDateFormat("yyyy年MM月dd日");
return resdf.format(getsdf.parse(strTime));
}
/**
* 获取某一个月的周数
* @param date
* @throws ParseException
* @throws Exception
*/
public static int getMonthWeek(String date) throws ParseException {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
Date s = sdf.parse(date);
Calendar ca = Calendar.getInstance();
ca.setTime(s);
ca.setFirstDayOfWeek(Calendar.MONDAY);
int weeks = ca.getActualMaximum(Calendar.WEEK_OF_MONTH);
return weeks;
};
}