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  • Java常用工具类之时间转换(注释乱码,全)

    package com.wazn.learn.util;
    
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.ArrayList;
    import java.util.Calendar;
    import java.util.Date;
    import java.util.List;
    
    /**
     * ͨ����
     * 
     * @author root
     */
    public class DateUtil {
        private static SimpleDateFormat date = new SimpleDateFormat("yyyy-MM-dd");
        private static SimpleDateFormat datetime = new SimpleDateFormat(
                "yyyy-MM-dd HH:mm:ss");
        public static Date getNowDate(){
            return new Date();
        }
        // ****************************��ǰʱ�����****************************
        /**
         * ����� yyyy-MM-dd Ϊ��ʽ�ĵ�ǰʱ���ַ���
         * 
         * @return String
         */
        public static String getCurrentTimeByDay() {
            String time = date.format(new Date(System.currentTimeMillis()));
            return time;
        }
    
        /**
         * ����� yyyy-MM-dd HH:mm:ss Ϊ��ʽ�ĵ�ǰʱ���ַ���
         * 
         * @return String
         */
        public static String getCurrentTimeBySecond() {
            String time = datetime.format(new Date(System.currentTimeMillis()));
            return time;
        }
    
        /**
         * ��ø�����ʽ�ĵ�ǰʱ���ַ���
         * 
         * @param give
         *            String ������ʱ���ʽ
         * @return String
         */
        public static String getCurrentTime(String give) {
            SimpleDateFormat temp = new SimpleDateFormat(give);
            return temp.format(new Date(System.currentTimeMillis()));
        }
    
        // ****************************Stringת��ΪDate****************************
        /**
         * ��Stringת����date
         * 
         * @throws ParseException
         * */
        public static Date pStringToDate(String str, String sfgs)
                throws ParseException {
            SimpleDateFormat sf = new SimpleDateFormat(sfgs);
            return sf.parse(str);
        }
    
        /**
         * ��Stringת����date ��ʽΪyyyy-MM-dd hh:mm:ss
         * 
         * @throws ParseException
         * */
        public static Date pStringToDate(String str) throws ParseException {
            return datetime.parse(str);
        }
    
        // ****************************Dateת��ΪString****************************
        /**
         * ת�������ڸ�ʽ���ַ��� ��ʽΪyyyy-MM-dd
         * 
         * @param Object
         * @return String
         */
        public static String dateFormat(Date o) {
            if (o == null) {
                return "";
            }
            return date.format(o);
        }
    
        /**
         * ת����ʱ���ʽ���ַ��� ��ʽΪyyyy-MM-dd hh:mm:ss
         * 
         * @param Date
         * @return String
         */
        public static String dateTimeFormat(Date o) {
            if (o == null) {
                return "";
            }
            return datetime.format(o);
        }
    
        /**
         * ת���ɸ���ʱ���ʽ���ַ���
         * 
         * @param Date
         * @param String
         * @return String
         */
        public static String getDateFormat(Date d, String format) {
            return new SimpleDateFormat(format).format(d);
        }
    
        /**
         * ���ڸ�ʽ��(yyyy��MM��dd��)
         * 
         * @param Date
         * @return String
         * */
        public static String fDateCNYR(Date date) {
            return getDateFormat(date, "yyyy��MM��dd��");
        }
    
        /**
         * ���ڸ�ʽ��(yyyy��MM��dd�� HH:mm)
         * 
         * @param Date
         * @return String
         * */
        public static String fDateCNYRS(Date date) {
            return getDateFormat(date, "yyyy��MM��dd�� HH��");
        }
    
        /**
         * ���ڸ�ʽ��(yyyy��MM��dd�� HH:mm)
         * 
         * @param Date
         * @return String
         * */
        public static String fDateCNYRSF(Date date) {
            return getDateFormat(date, "yyyy��MM��dd�� HH:mm");
        }
    
        /**
         * ���ڸ�ʽ��(yyyy��MM��dd�� HH:mm:ss)
         * 
         * @param Date
         * @return String
         * */
        public static String fDateCNYRSFM(Date date) {
            return getDateFormat(date, "yyyy��MM��dd�� HH:mm:ss");
        }
    
        // ****************************ʱ���ʽ��Stringת��ΪString****************************
        /**
         * ���ݸ�����ʱ���ʽ�ַ�����ȡ������ʽ���ַ���
         * 
         * @param d
         *            String ����ʱ���ʽΪyyyy-MM-dd HH:mm:ss
         * @param format
         *            String �����ĸ�ʽ
         * @return String
         */
        public static String getDateFormat(String d, String format)
                throws ParseException {
            Date date = datetime.parse(d);
            return getDateFormat(date, format);
        }
    
        // ****************************ʱ���ʽ��Stringת��Ϊlong****************************
        /**
         * ͨ���ַ������long��ʱ��
         * 
         * @param String
         * @return long
         */
        public static long getDateFromStr(String dateStr) {
            long temp = 0L;
            Date date = null;
            try {
                date = datetime.parse(dateStr);
            } catch (Exception e) {
                e.printStackTrace();
                return temp;
            }
            temp = date.getTime();
            return temp;
        }
    
        // ****************************Dateת��Ϊ������ʽ��Date****************************
        /**
         * ���ڸ�ʽ����2014-03-04��
         * 
         * @param Date
         * @return Date
         * @throws ParseException
         * */
        public static Date fDate(Date dat) throws ParseException {
            String dateStr = date.format(dat);
            return date.parse(dateStr);
        }
    
        /**
         * ͨ����ʼʱ��ͼ����ý���ʱ�䡣
         * 
         * @param String
         * @param int
         * @return String
         */
        public static String getEndTime(String start, int span) {
            if (isNullOrNone(start) || span == 0) {
                return null;
            }
            long temp = getDateFromStr(start);
            temp += span * 60L * 1000L;
            return datetime.format(new Date(temp));
        }
    
        /**
         * ��ʽ���ַ�������2013-10-20 00:00:00.000000��Ϊ2013-10-20 00:00:00
         * 
         * @param String
         *            str
         * @return String
         * @throws ParseException
         * */
        public static String getFormatStringDay(String str) throws ParseException {
            Date date = datetime.parse(str);
            return datetime.format(date);
        }
    
        /**
         * �ж��Ƿ�Ϊ��
         * 
         * @param String
         * @return boolean
         */
        public static boolean isNullOrNone(String src) {
            if (null == src || "".equals(src)) {
                return true;
            }
            return false;
        }
    
        /**
         * ����ַ������ȴ���25���ȡǰ25���ַ��������ij�ʡ�Ժ�
         * 
         * @param String
         * @return String
         */
        public static String showCount(String str) {
            if (str != null) {
                if (str.length() > 25) {
                    str = str.substring(0, 25);
                    str = str + "...";
                }
            } else {
                str = "";
            }
            return str;
        }
    
        /**
         * �Ƿ�������ڸ�ʽyyyy-MM-dd
         * 
         * @param day
         *            String �����ַ���
         * @return boolean
         */
        public static boolean isFormatDay(String day) {
            return day
                    .matches("(([0-9]{3}[1-9]|[0-9]{2}[1-9][0-9]{1}|[0-9]{1}[1-9][0-9]{2}|[1-9][0-9]{3})-(((0[13578]|1[02])-(0[1-9]|[12][0-9]|3[01]))|((0[469]|11)-(0[1-9]|[12][0-9]|30))|(02-(0[1-9]|[1][0-9]|2[0-8]))))|((([0-9]{2})(0[48]|[2468][048]|[13579][26])|((0[48]|[2468][048]|[3579][26])00))-02-29)");
        }
    
        /**
         * �Ƿ����ʱ���ʽHH:mm:ss
         * 
         * @param time
         *            String ʱ���ַ���
         * @return boolean
         */
        public static boolean isFormatTime(String time) {
            return time
                    .matches("(0[1-9]|1[0-9]|2[0-4]):(0[1-9]|[1-5][0-9]):(0[1-9]|[1-5][0-9])(\.000000)?");
        }
    
        /**
         * �Ƿ����ʱ���ʽyyyy-MM-dd HH:mm:ss
         * 
         * @param time
         *            String ʱ���ַ���
         * @return boolean
         */
        public static boolean isFormat(String time) {
            String[] temp = time.split(" ");
            return isFormatDay(temp[0]) && isFormatTime(temp[1]);
        }
    
        /**
         * ͨ���������ꡢ�¡��ܻ�ø����ڵ�ÿһ������
         * 
         * @param year
         *            int ��
         * @param month
         *            int ��
         * @param week
         *            int ��
         * @return List<Date> ���������
         */
        public static List<Date> getDayByWeek(int year, int month, int week) {
            List<Date> list = new ArrayList<Date>();
            // �ȹ���������.
            Calendar c = Calendar.getInstance();
            c.set(Calendar.YEAR, year);
            // ��������:
            c.set(Calendar.MONTH, month - 1);
            // ��������:
            c.set(Calendar.WEEK_OF_MONTH, week);
            // �õ����ܵ�һ��:
            for (int i = 0; i < 6; i++) {
                c.set(Calendar.DAY_OF_WEEK, i + 2);
                list.add(c.getTime());
            }
            // ���һ��:
            c.set(Calendar.WEEK_OF_MONTH, week + 1);
            c.set(Calendar.DAY_OF_WEEK, 1);
            list.add(c.getTime());
            return list;
        }
    
        /**
         * ��õ�ǰ�����DZ��µĵڼ���
         * 
         * @return int
         */
        public static int getCurWeekNoOfMonth() {
            Date date = new Date(System.currentTimeMillis());
            Calendar calendar = Calendar.getInstance();
            calendar.setFirstDayOfWeek(Calendar.MONDAY);
            calendar.setTime(date);
            return calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH);
        }
    
        /**
         * ��õ�ǰ���������ڼ�
         * 
         * @return int
         */
        public static int getCurWeekNo(String dat) {
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
            Date date = null;
            try {
                date = format.parse(dat);
            } catch (ParseException e) {
                e.printStackTrace();
            }
            Calendar calendar = Calendar.getInstance();
            calendar.setFirstDayOfWeek(Calendar.MONDAY);
            calendar.setTime(date);
            return calendar.get(Calendar.DAY_OF_WEEK);
        }
    
        /**
         * ��õ�ǰ�����
         * 
         * @return
         */
        public static int getCurrentYear() {
            Calendar calendar = Calendar.getInstance();
            return calendar.get(Calendar.YEAR);
        }
    
        /**
         * ��õ�ǰ���·�
         * 
         * @return
         */
        public static int getCurrentMonth() {
            Calendar calendar = Calendar.getInstance();
            return calendar.get(Calendar.MONTH) + 1;
        }
    
        /**
         * ��õ�ǰ��������
         * 
         * @return
         */
        public static int getCurrentDay() {
            Calendar calendar = Calendar.getInstance();
            return calendar.get(Calendar.DATE);
        }
        /**
         * ��ȡ�������һ��
         * 
         * @param Date date
         * @param String format
         * @return String
         * */
        public static String lastDayOfMoth(Date date, String format){
            Calendar cal = Calendar.getInstance();
            cal.setTime(date);
            cal.set(Calendar.DAY_OF_MONTH,1);
            cal.add(Calendar.MONTH,1);
            cal.add(Calendar.DATE, -1);
            date =  cal.getTime();;
            SimpleDateFormat sf = new SimpleDateFormat(format);
            return sf.format(date);
        }
        /**
         * ��ȡ�������һ��
         * 
         * @param Date date
         * @param String format
         * @return String
         * */
        public static String firstDayOfMoth(Date date, String format){
            Calendar cal = Calendar.getInstance();
            cal.setTime(date);
            cal.add(Calendar.DATE, 0);
            date =  cal.getTime();;
            SimpleDateFormat sf = new SimpleDateFormat(format);
            return sf.format(date);
        }
        //****************************************************************
        /**
         * ת�����ַ������������������Integer��ʽ�ķ���0�������Double��ʽ�ķ���0.0
         * 
         * @param Object
         * @return String
         */
        public static String toString(Object o) {
            if (o == null) {
                if (o instanceof Integer) {
                    return "0";
                }
                if (o instanceof Double) {
                    return "0.0";
                }
                return "";
            } else {
                return o.toString();
            }
        }
    
        /**
         * ����ַ��������Ϊ������ת����null
         * 
         * @param String
         * @return String
         */
        public static String emptyString2Null(String src) {
            if (src != null) {
                if ("".equals(src)) {
                    src = null;
                }
            }
            return src;
        }
        /**
         * ת���ɿ���hql��ʹ�õ��ַ���
         * 1,2 תΪ '1','2'
         * */
        public static String formatIds(String ids){
            if(ids!=null&&ids!="")
            {
                String[] id = ids.split(",");
                StringBuffer idsStr = new StringBuffer();
                for(String str : id){
                    idsStr.append("'"+str+"',");
                }
                return idsStr.toString().substring(0,idsStr.length()-1);
            }
            else
            {
                return "";
            }
        }
        /**
         * ��ȡ��ǰ����ǰһ��
         * 
         * @param Date date
         * @return Date
         * */
        public static Date getSpecifiedDayBefore(Date date){
            Calendar c = Calendar.getInstance();
            c.setTime(date);
            int day = c.get(Calendar.DATE);
            c.set(Calendar.DATE, day-1);
            date = c.getTime();
            return date;
        }
        /**
         * �Ƚ��������ڵĴ�С
         * 
         * @param data1
         * @param data2
         * 
         * @return boolean
         * 
         * @author zhangss 2016-5-18 13:47:16
         * */
        public boolean bjDate(Date date1, Date date2){
            if (date1.getTime() > date2.getTime()) {
                return true;
            }
            return false;
        }
    }
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  • 原文地址:https://www.cnblogs.com/jiangwz/p/8310944.html
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