java日期处置 很全面地处理

java日期处理 很全面地处理

import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.regex.Pattern;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class DateUtil {
??? protected static Log logger = LogFactory.getLog(DateUtil.class);

??? // 格式：年－月－日 小时：分钟：秒
??? public static final String FORMAT_ONE = "yyyy-MM-dd HH:mm:ss";

??? // 格式：年－月－日 小时：分钟
??? public static final String FORMAT_TWO = "yyyy-MM-dd HH:mm";

??? // 格式：年月日 小时分钟秒
??? public static final String FORMAT_THREE = "yyyyMMdd-HHmmss";

??? // 格式：年－月－日
??? public static final String LONG_DATE_FORMAT = "yyyy-MM-dd";

??? // 格式：月－日
??? public static final String SHORT_DATE_FORMAT = "MM-dd";

??? // 格式：小时：分钟：秒
??? public static final String LONG_TIME_FORMAT = "HH:mm:ss";

??? //格式：年-月
??? public static final String MONTG_DATE_FORMAT = "yyyy-MM";

??? // 年的加减
??? public static final int SUB_YEAR = Calendar.YEAR;

??? // 月加减
??? public static final int SUB_MONTH = Calendar.MONTH;

??? // 天的加减
??? public static final int SUB_DAY = Calendar.DATE;

??? // 小时的加减
??? public static final int SUB_HOUR = Calendar.HOUR;

??? // 分钟的加减
??? public static final int SUB_MINUTE = Calendar.MINUTE;

??? // 秒的加减
??? public static final int SUB_SECOND = Calendar.SECOND;

??? static final String dayNames[] = { "星期日", "星期一", "星期二", "星期三", "星期四",
??????????? "星期五", "星期六" };

??? @SuppressWarnings("unused")
??? private static final SimpleDateFormat timeFormat = new SimpleDateFormat(
??????????? "yyyy-MM-dd HH:mm:ss");

??? public DateUtil() {
??? }

??? /**
???? * 把符合日期格式的字符串转换为日期类型
???? */
??? public static java.util.Date stringtoDate(String dateStr, String format) {
??????? Date d = null;
??????? SimpleDateFormat formater = new SimpleDateFormat(format);
??????? try {
??????????? formater.setLenient(false);
??????????? d = formater.parse(dateStr);
??????? } catch (Exception e) {
??????????? // log.error(e);
??????????? d = null;
??????? }
??????? return d;
??? }

??? /**
???? * 把符合日期格式的字符串转换为日期类型
???? */
??? public static java.util.Date stringtoDate(String dateStr, String format,
??????????? ParsePosition pos) {
??????? Date d = null;
??????? SimpleDateFormat formater = new SimpleDateFormat(format);
??????? try {
??????????? formater.setLenient(false);
??????????? d = formater.parse(dateStr, pos);
??????? } catch (Exception e) {
??????????? d = null;
??????? }
??????? return d;
??? }

??? /**
???? * 把日期转换为字符串
???? */
??? public static String dateToString(java.util.Date date, String format) {
??????? String result = "";
??????? SimpleDateFormat formater = new SimpleDateFormat(format);
??????? try {
??????????? result = formater.format(date);
??????? } catch (Exception e) {
??????????? // log.error(e);
??????? }
??????? return result;
??? }

??? /**
???? * 获取当前时间的指定格式
???? */
??? public static String getCurrDate(String format) {
??????? return dateToString(new Date(), format);
??? }

??? public static String dateSub(int dateKind, String dateStr, int amount) {
??????? Date date = stringtoDate(dateStr, FORMAT_ONE);
??????? Calendar calendar = Calendar.getInstance();
??????? calendar.setTime(date);
??????? calendar.add(dateKind, amount);
??????? return dateToString(calendar.getTime(), FORMAT_ONE);
??? }

??? /**
???? * 两个日期相减
???? * @return 相减得到的秒数
???? */
??? public static long timeSub(String firstTime, String secTime) {
??????? long first = stringtoDate(firstTime, FORMAT_ONE).getTime();
??????? long second = stringtoDate(secTime, FORMAT_ONE).getTime();
??????? return (second - first) / 1000;
??? }

??? /**
???? * 获得某月的天数
???? */
??? public static int getDaysOfMonth(String year, String month) {
??????? int days = 0;
??????? if (month.equals("1") || month.equals("3") || month.equals("5")
??????????????? || month.equals("7") || month.equals("8") || month.equals("10")
??????????????? || month.equals("12")) {
??????????? days = 31;
??????? } else if (month.equals("4") || month.equals("6") || month.equals("9")
??????????????? || month.equals("11")) {
??????????? days = 30;
??????? } else {
??????????? if ((Integer.parseInt(year) % 4 == 0 && Integer.parseInt(year) % 100 != 0)
??????????????????? || Integer.parseInt(year) % 400 == 0) {
??????????????? days = 29;
??????????? } else {
??????????????? days = 28;
??????????? }
??????? }

??????? return days;
??? }

??? /**
???? * 获取某年某月的天数
???? */
??? public static int getDaysOfMonth(int year, int month) {
??????? Calendar calendar = Calendar.getInstance();
??????? calendar.set(year, month - 1, 1);
??????? return calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
??? }

??? /**
???? * 获得当前日期
???? */
??? public static int getToday() {
??????? Calendar calendar = Calendar.getInstance();
??????? return calendar.get(Calendar.DATE);
??? }

??? /**
???? * 获得当前月份
???? */
??? public static int getToMonth() {
??????? Calendar calendar = Calendar.getInstance();
??????? return calendar.get(Calendar.MONTH) + 1;
??? }

??? /**
???? * 获得当前年份
???? */
??? public static int getToYear() {
??????? Calendar calendar = Calendar.getInstance();
??????? return calendar.get(Calendar.YEAR);
??? }

??? /**
???? * 返回日期的天
???? */
??? public static int getDay(Date date) {
??????? Calendar calendar = Calendar.getInstance();
??????? calendar.setTime(date);
??????? return calendar.get(Calendar.DATE);
??? }

??? /**
???? * 返回日期的年
???? */
??? public static int getYear(Date date) {
??????? Calendar calendar = Calendar.getInstance();
??????? calendar.setTime(date);
??????? return calendar.get(Calendar.YEAR);
??? }

??? /**
???? * 返回日期的月份，1-12
???? */
??? public static int getMonth(Date date) {
??????? Calendar calendar = Calendar.getInstance();
??????? calendar.setTime(date);
??????? return calendar.get(Calendar.MONTH) + 1;
??? }

??? /**
???? * 计算两个日期相差的天数，如果date2 > date1 返回正数，否则返回负数
???? */
??? public static long dayDiff(Date date1, Date date2) {
??????? return (date2.getTime() - date1.getTime()) / 86400000;
??? }

??? /**
???? * 比较两个日期的年差
???? */
??? public static int yearDiff(String before, String after) {
??????? Date beforeDay = stringtoDate(before, LONG_DATE_FORMAT);
??????? Date afterDay = stringtoDate(after, LONG_DATE_FORMAT);
??????? return getYear(afterDay) - getYear(beforeDay);
??? }

??? /**
???? * 比较指定日期与当前日期的差
???? */
??? public static int yearDiffCurr(String after) {
??????? Date beforeDay = new Date();
??????? Date afterDay = stringtoDate(after, LONG_DATE_FORMAT);
??????? return getYear(beforeDay) - getYear(afterDay);
??? }
???
??? /**
???? * 比较指定日期与当前日期的差
???? */
??? public static long dayDiffCurr(String before) {
??????? Date currDate = DateUtil.stringtoDate(currDay(), LONG_DATE_FORMAT);
??????? Date beforeDate = stringtoDate(before, LONG_DATE_FORMAT);
??????? return (currDate.getTime() - beforeDate.getTime()) / 86400000;

??? }

??? /**
???? * 获取每月的第一周
???? */
??? public static int getFirstWeekdayOfMonth(int year, int month) {
??????? Calendar c = Calendar.getInstance();
??????? c.setFirstDayOfWeek(Calendar.SATURDAY); // 星期天为第一天
??????? c.set(year, month - 1, 1);
??????? return c.get(Calendar.DAY_OF_WEEK);
??? }
??? /**
???? * 获取每月的最后一周
???? */
??? public static int getLastWeekdayOfMonth(int year, int month) {
??????? Calendar c = Calendar.getInstance();
??????? c.setFirstDayOfWeek(Calendar.SATURDAY); // 星期天为第一天
??????? c.set(year, month - 1, getDaysOfMonth(year, month));
??????? return c.get(Calendar.DAY_OF_WEEK);
??? }

??? /**
???? * 获得当前日期字符串，格式"yyyy_MM_dd_HH_mm_ss"
???? *
???? * @return
???? */
??? public static String getCurrent() {
??????? Calendar cal = Calendar.getInstance();
??????? cal.setTime(new Date());
??????? int year = cal.get(Calendar.YEAR);
??????? int month = cal.get(Calendar.MONTH) + 1;
??????? int day = cal.get(Calendar.DAY_OF_MONTH);
??????? int hour = cal.get(Calendar.HOUR_OF_DAY);
??????? int minute = cal.get(Calendar.MINUTE);
??????? int second = cal.get(Calendar.SECOND);
??????? StringBuffer sb = new StringBuffer();
??????? sb.append(year).append("_").append(StringUtil.addzero(month, 2))
??????????????? .append("_").append(StringUtil.addzero(day, 2)).append("_")
??????????????? .append(StringUtil.addzero(hour, 2)).append("_").append(
??????????????????????? StringUtil.addzero(minute, 2)).append("_").append(
??????????????????????? StringUtil.addzero(second, 2));
??????? return sb.toString();
??? }

??? /**
???? * 获得当前日期字符串，格式"yyyy-MM-dd HH:mm:ss"
???? *
???? * @return
???? */
??? public static String getNow() {
??????? Calendar today = Calendar.getInstance();
??????? return dateToString(today.getTime(), FORMAT_ONE);
??? }

?

??? /**
???? * 判断日期是否有效,包括闰年的情况
???? *
???? * @param date
???? *????????? YYYY-mm-dd
???? * @return
???? */
??? public static boolean isDate(String date) {
??????? StringBuffer reg = new StringBuffer(
??????????????? "^((\\d{2}(([02468][048])|([13579][26]))-?((((0?");
??????? reg.append("[13578])|(1[02]))-?((0?[1-9])|([1-2][0-9])|(3[01])))");
??????? reg.append("|(((0?[469])|(11))-?((0?[1-9])|([1-2][0-9])|(30)))|");
??????? reg.append("(0?2-?((0?[1-9])|([1-2][0-9])))))|(\\d{2}(([02468][12");
??????? reg.append("35679])|([13579][01345789]))-?((((0?[13578])|(1[02]))");
??????? reg.append("-?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))");
??????? reg.append("-?((0?[1-9])|([1-2][0-9])|(30)))|(0?2-?((0?[");
??????? reg.append("1-9])|(1[0-9])|(2[0-8]))))))");
??????? Pattern p = Pattern.compile(reg.toString());
??????? return p.matcher(date).matches();
??? }