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package com.xu.manager.bean; 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.List; import java.util.Locale; import java.util.TimeZone; public class DateFormat{ //日期格式 private static final String DATE_PATTERN_1 = "yyyy-MM-dd"; private static final String DATE_PATTERN_2 = "yyyyMMdd"; private static final String DATE_PATTERN_3 = "yyyy/MM/dd"; //时间格式 private static final String TIME_PATTERN_1 = "HH:mm:ss"; private static final String TIME_PATTERN_2 = "HHmmss"; //日期时间格式 private static final String DATETIME_PATTERN_1 = "yyyy-MM-dd HH:mm:ss"; private static final String DATETIME_PATTERN_2 = "yyyy-MM-dd HH:mm"; private static final String TIMESTAMP = "yyyyMMddHHmmsssss"; private static final String GMT_TIME ="d MMM yyyy hh:mm:ss GMT"; private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat(); //private static final SimpleDateFormat DATE_FORMAT_YYYY_MM_DD = new SimpleDateFormat("yyyy-MM-dd"); //private static final SimpleDateFormat DATE_FORMAT_HH_MM_SS = new SimpleDateFormat("HH:mm:ss"); /** * 获取当前日期 * @return String YYYY-MM-DD */ public static String getCurrentDateStr1() { return getCurrentDateStr(DATE_PATTERN_1); } /** * 获取当前日期 * @return String YYYY-MM-DD */ public static String getCurrentDateStr2() { return getCurrentDateStr(DATE_PATTERN_2); } /** * 获取当前日期 * @return String YYYY-MM-DD */ public static String getCurrentDateStr3() { return getCurrentDateStr(DATE_PATTERN_3); } /** * 获取指定格式的当前日期 * @param format * @return */ public static String getCurrentDateStr(String format) { String dateStr = ""; Calendar cal = Calendar.getInstance(); DATE_FORMAT.applyPattern(format); dateStr = DATE_FORMAT.format(cal.getTime()); return dateStr; } /** * 获取当前时间 * @return String HH:mm:ss */ public static String getCurrentTimeStr1() { return getCurrentTimeStr(TIME_PATTERN_1); } /** * 获取当前时间 * @return String HHmmss */ public static String getCurrentTimeStr2() { return getCurrentTimeStr(TIME_PATTERN_2); } /** * 获取当前时间 * @param format * @return */ public static String getCurrentTimeStr(String format) { String timeStr = ""; Calendar cal = Calendar.getInstance(); DATE_FORMAT.applyPattern(format); timeStr = DATE_FORMAT.format(cal.getTime()); return timeStr; } /** * 获取当前日期时间 * @return String yyyy-MM-dd HH-mm-ss */ public static String getCurrentDateTimeStr() { return getCurrentDateStr1() + " " + getCurrentTimeStr1(); } /** * 获取当前日期时间 * @return String yyyyMMddHHmmss */ public static String getCurrentDateTimeStr2() { return getCurrentDateStr2() + getCurrentTimeStr2(); } /** * 获取当前日期时间 * @return String yyyyMMddHHmmss */ public static String getTimeStamp() { return getCurrentDateStr(TIMESTAMP); } public static String formatDate(Date d) { DATE_FORMAT.applyPattern(DATE_PATTERN_1); return DATE_FORMAT.format(d); } public static String formatDate(String dateStr) { Date d = null; String date = ""; try { d = DATE_FORMAT.parse(dateStr); DATE_FORMAT.applyPattern(DATE_PATTERN_1); date = DATE_FORMAT.format(d); } catch (ParseException e) { e.printStackTrace(); } return date; } public static String formatTime(Date d) { DATE_FORMAT.applyPattern(TIME_PATTERN_1); return DATE_FORMAT.format(d); } public static String formatTime(String time) { Date d = null; String str = ""; try { d = DATE_FORMAT.parse(time); DATE_FORMAT.applyPattern(TIME_PATTERN_1); str = DATE_FORMAT.format(d); } catch (ParseException e) { e.printStackTrace(); } return str; } public static String formatDateTime(Date d) { return formatDateTime(d, DATETIME_PATTERN_1); } public static String formatDateTimeMinute(Date d) { return formatDateTime(d, DATETIME_PATTERN_2); } public static String formatDateTime(Date d, String format) { if(d == null) return ""; DATE_FORMAT.applyPattern(format); return DATE_FORMAT.format(d); } public static String formatDateTime(String datetime) { Date d = null; String str = ""; try { d = DATE_FORMAT.parse(datetime); DATE_FORMAT.applyPattern(DATETIME_PATTERN_1); str = DATE_FORMAT.format(d); } catch (ParseException e) { e.printStackTrace(); } return str; } public static int getCurYear() { Calendar today = GregorianCalendar.getInstance(); return today.get(Calendar.YEAR); } public static int getCurMonth() { Calendar today = GregorianCalendar.getInstance(); return today.get(Calendar.MONTH) + 1; } public static int getCurDay() { Calendar today = GregorianCalendar.getInstance(); return today.get(Calendar.DATE); } /** * 获取前后N年的年集合 * * @return */ public static List<Integer> getYears(int prevYearNumber, int nextYearNumber) { List<Integer> years = new ArrayList<Integer>(); Integer curYear = DateUtil.getCurYear(); for (int i = curYear - prevYearNumber; i <= curYear + nextYearNumber; i++) { years.add(i); } return years; } /** * 获取月列表 * @方法名称： * @方法描述： * @引用表： * @详细流程： * * @param n * n = 0 返回[1...12] * n = 1.. 12 返回 [1.. n] * n = -1 返回[1... 当前月] * @return */ public static List<Integer> getMonths(int n) { if (n == 0) { n = 12; // 返回12个月 } else if (n == -1) { n = DateUtil.getCurMonth(); } List<Integer> month = new ArrayList<Integer>(); for (int i = 1; i <= n; i++) { month.add(i); } return month; } /** * 获取前/后几个月的第一天 * * @return * @throws Exception */ public static Calendar getFirstDayByAddMonth(int n) { Calendar lastDate = GregorianCalendar.getInstance(); lastDate.set(Calendar.DATE, 1);// 设为当前月的1号 lastDate.add(Calendar.MONTH, n);// 减N个月，变为上月的1号 return lastDate; } /** * * @方法名称：格式化一个字符串日期 * @方法描述： * * @param strDate * @param pattren * @return * @throws Exception */ public static String formatDate(String strDate, String fromPattern, String toPattren) throws Exception { SimpleDateFormat sdf = new SimpleDateFormat(fromPattern); Date d = sdf.parse(strDate); sdf.applyPattern(toPattren); String date = sdf.format(d); return date; } /** * * @方法名称：对某日期加减月 * * @param now * @param n * @return */ public static Date addMonth(Date date, int n) { Calendar calendar = GregorianCalendar.getInstance(); calendar.setTimeInMillis(date.getTime()); calendar.add(Calendar.MONTH, n); return new Date(calendar.getTimeInMillis()); } public static Date addMonth(Date date, double n) { Calendar calendar = GregorianCalendar.getInstance(); calendar.setTimeInMillis(date.getTime());