DateUtil公共类

package com.hxqc.pricemonitor.util;import java.text.DateFormat;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;public class DateUtil {private static SimpleDateFormat year_format = new SimpleDateFormat("yyyy");public static SimpleDateFormat default_format = new SimpleDateFormat("yyyy-MM-dd");public static SimpleDateFormat common_format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");public static SimpleDateFormat time_format = new SimpleDateFormat("yyyyMMddHHmmss");protected static Log log = LogFactory.getLog(DateUtil.class);/** * 得到当前时间,返回long型 *  * @return String */public static long generateLongTime() {Date dt = new Date();return dt.getTime();}/** * 得到当前时间,格式为yyyyMMddhhmmss *  * @return String */public static String generateTime() {SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");return format.format(new Date());}/** * 根据格式生成当前日期时间 *  * @param formatStr * @return */public static String generateDateTime(String formatStr) {SimpleDateFormat format = new SimpleDateFormat(formatStr);return format.format(new Date());}public static String generateDateTimeAddHour(int addHour,String formatstr){Calendar cal = Calendar.getInstance();cal.add(Calendar.HOUR_OF_DAY, addHour);SimpleDateFormat format = new SimpleDateFormat(formatstr);return format.format(cal.getTime());}/** * 根据格式生成日期时间 * @param date * @param formatStr * @return */    public static String generateDateTime(Date date,String formatStr){    SimpleDateFormat format = new SimpleDateFormat(formatStr);return format.format(date);    }/** * 根据yyyy-MM-dd得到月份 *  * @param dateString *            String * @return int */public static int getMonthFromYear(String dateString) {Date date = string2Date(dateString);Calendar calendar = Calendar.getInstance();calendar.setTime(date);System.out.println("calendar.setTime::::"+(calendar.get(Calendar.WEEK_OF_YEAR)));return calendar.get(Calendar.MONTH) + 1;}/** * 得到指定年的所有天数 *  * @param year *            String * @return day int */public static int getDayFromYear(String year) {Date date;int day = 0;try {date = year_format.parse(year);Calendar calendar = new GregorianCalendar();calendar.setTime(date);day = calendar.getActualMaximum(Calendar.DAY_OF_YEAR);} catch (ParseException e) {log.error("", e);}return day;}/** * 返回下一年_格式yyyy *  * @return int */public static int getNextYear() {return new GregorianCalendar().get(Calendar.YEAR) + 1;}/** * 获取某年第一天日期_格式yyyy-MM-dd *  * @param year *            年份 * @return String */public static String getCurrYearFirstDay(int year) {Calendar calendar = Calendar.getInstance();calendar.clear();calendar.set(Calendar.YEAR, year);Date currYearFirst = calendar.getTime();return default_format.format(currYearFirst);}/** * 根据一个日期，返回是星期几的数字_星期一:1....星期六:6,星期天:7， * 注意：日期输错，不会报错，例如：2月30或31号 *  * @param date *            日期值 * @return int */public static int getWeek(Date date) {Calendar c = Calendar.getInstance();c.setTime(date);System.out.println("c.get(Calendar.DAY_OF_WEEK)::::"+c.get(Calendar.DAY_OF_WEEK));int iDay = 0;if (c.get(Calendar.DAY_OF_WEEK) == 1) {iDay = 7;} else {iDay = c.get(Calendar.DAY_OF_WEEK) - 1;}return iDay;}/** * 根据一个日期，返回是星期几的数字_星期一:1....星期六:6,星期天:7， * 注意：日期输错，不会报错，例如：2月30或31号 *  * @param dateString *            String * @return int */public static int getWeek(String dateString) {Date date = string2Date(dateString);Calendar c = Calendar.getInstance();c.setTime(date);int iDay = 0;if (c.get(Calendar.DAY_OF_WEEK) == 1) {iDay = 7;} else {iDay = c.get(Calendar.DAY_OF_WEEK) - 1;}return iDay;}/** * 根据一个日期,传入指定天数,想要返回长度,得到String *  * @param inDate *            日期 * @param days *            天数 * @param _iType *            inDate长度 * @return String */public static String getDateByAddDays(String inDate, int days, int _iType) {Date dateStr = string2Date(inDate);Date tempDate = getDateByAddDays(dateStr, days);return date2String(tempDate, _iType);}/** * 根据Date日期,传入返回长度,得到String *  * @param date *            Date * @param _iType *            返回String长度 * @return String */public static String date2String(Date date, int _iType) {String strTemp = time_format.format(date);SimpleDateFormat formatter = null;switch (_iType) {case 0: // yyyymmddstrTemp = strTemp.substring(0, 8);break;case 4:// yyyystrTemp = strTemp.substring(0, 4);break;case 6: // yymmddstrTemp = strTemp.substring(2, 8);break;case 8: // yyyymmddstrTemp = strTemp.substring(0, 8);break;case 14:// yyyyMMddHHmmss 格式break;case 10: // yyyy-mm-ddformatter = new SimpleDateFormat("yyyy-MM-dd");strTemp = formatter.format(date);break;case 19: // yyyy-mm-dd HH:mm:ssformatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");strTemp = formatter.format(date);break;case -6: // HHmmssstrTemp = strTemp.substring(8);break;case -8: // HH:mm:ssformatter = new SimpleDateFormat("HH:mm:ss");strTemp = formatter.format(date);break;default:break;}return strTemp;}/** * 获得指定日期前后的日期，返回日期型值 *  * @param inDate *            指定的日期 * @param days *            加减天数 * @return Date *  */public static Date getDateByAddDays(Date inDate, int days) {GregorianCalendar calendar = new GregorianCalendar();calendar.setTime(inDate);calendar.add(Calendar.DATE, days);return calendar.getTime();}public static String getDateByAddDays(String formatStr, int days) {SimpleDateFormat format = new SimpleDateFormat(formatStr);GregorianCalendar calendar = new GregorianCalendar();calendar.setTime(new Date());calendar.add(Calendar.DATE, days);return format.format(calendar.getTime());}public static Date getDateByAddMinutes(Date inDate, int minutes) {GregorianCalendar calendar = new GregorianCalendar();calendar.setTime(inDate);calendar.add(Calendar.MINUTE, minutes);return calendar.getTime();}/** * 获得指定日期前后的日期，返回日期格式 *  * @param inDate *            指定日期 * @param month *            加减月数 * @return */public static Date getDateByAddMonth(Date inDate, int month) {GregorianCalendar calendar = new GregorianCalendar();calendar.setTime(inDate);calendar.add(Calendar.MONTH, month);return calendar.getTime();}/** * 当前日期的前后日期，返回字符串格式 yyyyMMddHHmmss *  * @param month *            加减月数 * @return */public static String getCurrentByAddMonth(int month) {Date d = getDateByAddMonth(new Date(), month);return date2String(d, 14);}/** * 将日期字符串转换成日期型，日期格式为"yyyy-MM-dd" *  * @param dateString *            指定的日期字符串，格式为yyyyMMdd 或者yyyy-MM-dd * @return Date * @author lijunchen */public final static Date string2Date(String dateString) {if (dateString == null || dateString.trim().length() == 0) {return new Date(0);}// 处理不规范格式，例如：2013-1-2if (dateString.indexOf("-") > 0) {String month = dateString.substring(dateString.indexOf("-")+1,dateString.lastIndexOf("-"));if(month.length()==1){dateString =dateString.replace("-"+month+"-", "-0"+month+"-");}String day = dateString.substring(dateString.lastIndexOf("-")+1,dateString.length());if(day.length()==1){dateString = dateString.substring(0,dateString.lastIndexOf("-")+1)+"0"+day;}// System.out.println(dateString);}try {String strFormat = "";switch (dateString.length()) {case 4:strFormat = "yyyy";break;case 6: // yymmddstrFormat = "yyMMdd";break;case 8: // yyyymmddstrFormat = "yyyyMMdd";break;case 10: // yyyy-mm-ddstrFormat = "yyyy-MM-dd";break;case 14:strFormat = "yyyyMMddHHmmss";break;default:strFormat = "yyyy-MM-dd HH:mm:ss";}SimpleDateFormat simpleDateFormat = new SimpleDateFormat(strFormat);// 这里没有做非法日期的判断，比如：＂2007-05-33＂java.util.Date timeDate = simpleDateFormat.parse(dateString);return timeDate;} catch (Exception e) {return new Date(0);}}/** * 得到两个时间的差值，单位是小时 *  * @param beginDate * @param endDate * @return */public static double getHourBetweenDates(Date beginDate, Date endDate) {long l1 = endDate.getTime();long l2 = beginDate.getTime();double cc = l1 - l2;return cc / (60 * 60 * 1000);}/** * 得到两个时间的差值，单位是分钟 *  * @param beginDate * @param endDate * @return */public static double getMinuteBetweenDates(Date beginDate, Date endDate) {double cc = endDate.getTime() - beginDate.getTime();return cc / (60 * 1000);}/** * 根据Date日期,传入返回长度,得到String *  * @param date *            Date * @param _iType *            返回String长度 * @return String */public static String longDate2String(long lDate, int _iType) {Date date = new Date(lDate);String strTemp = time_format.format(date);SimpleDateFormat formatter = null;switch (_iType) {case 0: // yyyymmddstrTemp = strTemp.substring(0, 8);break;case 4:// yyyystrTemp = strTemp.substring(0, 4);break;case 6: // yymmddstrTemp = strTemp.substring(2, 8);break;case 8: // yyyymmddstrTemp = strTemp.substring(0, 8);break;case 10: // yyyy-mm-ddformatter = new SimpleDateFormat("yyyy-MM-dd");strTemp = formatter.format(date);break;case -6: // HHmmssstrTemp = strTemp.substring(8);break;case -8: // HH:mm:ssformatter = new SimpleDateFormat("HH:mm:ss");strTemp = formatter.format(date);break;default:break;}return strTemp;}public static int getDaysBetween(Date bDate, Date eDate) {Calendar d1 = new GregorianCalendar();d1.setTime(bDate);Calendar d2 = new GregorianCalendar();d2.setTime(eDate);int days = d2.get(Calendar.DAY_OF_YEAR) - d1.get(Calendar.DAY_OF_YEAR);int y2 = d2.get(Calendar.YEAR);if (d1.get(Calendar.YEAR) != y2) {d1 = (Calendar) d1.clone();do {days += d1.getActualMaximum(Calendar.DAY_OF_YEAR);// 得到当年的实际天数d1.add(Calendar.YEAR, 1);} while (d1.get(Calendar.YEAR) != y2);}return days;}/** * 返回本年份_格式yyyy *  * @return int */public static int getCurrYear() {return new GregorianCalendar().get(Calendar.YEAR);}/** * 获得月份英文缩写 *  * @param sMonth *            String * @return String */public static String getMonthEnglishName(String sMonth) {String[] arrMonth = {"JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", "SEP", "OCT", "NOV", "DEC"};int iMonth = 0;String sRet = "";try {iMonth = Integer.parseInt(sMonth);if (iMonth >= 1 && iMonth <= 12) {sRet = arrMonth[iMonth -1];}} catch (Exception e) {e.printStackTrace();}return sRet;}public static Date StringToDate(String dateStr, String formatStr) {DateFormat dd = new SimpleDateFormat(formatStr);Date date = null;try {date = dd.parse(dateStr);} catch (ParseException e) {e.printStackTrace();}return date;}public static int getBetweenDayNumber(Date dateA, Date dateB) {long dayNumber = 0;// 1小时=60分钟=3600秒=3600000long mins = 60L * 1000L;// long day= 24L * 60L * 60L * 1000L;计算天数之差dayNumber = (dateB.getTime() - dateA.getTime()) / mins;return (int) dayNumber;}/** * @param date1 *            需要比较的时间 不能为空(null),需要正确的日期格式 * @param date2 *            被比较的时间 为空(null)则为当前时间 * @param stype *            返回值类型 0为多少天，1为多少个月，2为多少年 * @return */@SuppressWarnings("unused")public static int compareDate(String date1, String date2, int stype) {int n = 0;String[] u = { "天", "月", "年" };String formatStyle = stype == 1 ? "yyyy-MM" : "yyyy-MM-dd";date2 = date2 == null ? DateUtil.getCurrentDate() : date2;DateFormat df = new SimpleDateFormat(formatStyle);Calendar c1 = Calendar.getInstance();Calendar c2 = Calendar.getInstance();try {c1.setTime(df.parse(date1));c2.setTime(df.parse(date2));} catch (Exception e3) {System.out.println("wrong occured");}// List list = new ArrayList();while (!c1.after(c2)) { // 循环对比，直到相等，n 就是所要的结果// list.add(df.format(c1.getTime())); // 这里可以把间隔的日期存到数组中 打印出来n++;if (stype == 1) {c1.add(Calendar.MONTH, 1); // 比较月份，月份+1} else {c1.add(Calendar.DATE, 1); // 比较天数，日期+1}}n = n - 1;if (stype == 2) {n = (int) n / 365;}//System.out.println(date1 + " -- " + date2 + " 相差多少" + u[stype] + ":" + n);return n;}/** * 得到当前日期 *  * @return */public static String getCurrentDate() {Calendar c = Calendar.getInstance();Date date = c.getTime();SimpleDateFormat simple = new SimpleDateFormat("yyyy-MM-dd");return simple.format(date);}}