DateUtil时间工具类

package com.rc.openapi.util;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;


@SuppressWarnings("unchecked")
public class DateUtil {
    private static SimpleDateFormat dateformater;
    static java.text.SimpleDateFormat sdfShort = new java.text.SimpleDateFormat("yyyyMMdd");
    public static java.text.SimpleDateFormat sdfLong = new java.text.SimpleDateFormat("yyyy-MM-dd");
    static java.text.SimpleDateFormat sdfLongTime = new java.text.SimpleDateFormat("yyyyMMddHHmmss");
    static java.text.SimpleDateFormat sdfLongTimePlus = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    static java.text.SimpleDateFormat sdfLongTimePlusMill = new java.text.SimpleDateFormat("yyyyMMddHHmmssSSSS");
    private static long DAY_IN_MILLISECOND = 0x5265c00L;

    /**
     * @param date
     * @param format 日期格式
     * @return String
     * @author zhangyong
     */
    public static String DateToStr(Date date, String format) {
        try {
            SimpleDateFormat sdf = new SimpleDateFormat(format);
            return sdf.format(date);
        } catch (Exception e) {
            System.out.println("Date 转 String 类型失败: " + e);
            return null;
        }
    }


    /**
     * 把字符型日期表达式转换成java.util.Date
     *
     * @param strDate 型如 "yyyy-M-dd" 的日期字符串
     * @return 转换后的java.util.Date对象；转换失败返回null
     */
    public Date parseDate(String strDate) {
        Date date = null;
        try {
            date = getDateFormater().parse(strDate);
        } catch (Exception ex) {
            //  System.err.println(ex.getMessage());
        }
        return date;
    }


    private DateFormat getDateFormater() {
        if (dateformater == null)
            dateformater = new SimpleDateFormat("yyyy-M-dd");
        return dateformater;
    }

    /**
     * @param Date date, int days
     * @return DATE 型加具体的天数
     * @author zhangyong
     */
    public static Date dateAddDays(Date date, int days) {
        long now = date.getTime() + (long) days * DAY_IN_MILLISECOND;
        return new Date(now);
    }

    public static String getDate() {
        Date date = new Date();
        DateFormat df = new SimpleDateFormat("yyyyMMdd");
        return df.format(date);
    }

    /**
     * @param Date date,String fFormatStr eg:yyyy-MM-dd HH:mm:ss
     * @return 将DATE 转换成字符性日期格式
     * @author zhangyong
     */
    public static String dateTypeToString(Date date, String fFormatStr) {
        //yyyy-MM-dd HH:mm:ss
        SimpleDateFormat dateformat = new SimpleDateFormat(fFormatStr);
        String strDate = dateformat.format(date);
        return strDate;
    }

    /**
     * @param yyyy-MM-dd
     * @author zhangyong
     * @获取当前的系统时间，并按照固定的格式初始话
     */
    public static String getStringOfNowDate(String fFormatStr) {
        String nowDateString = dateTypeToString(new Date(), fFormatStr);
        return nowDateString;
    }

    /**
     * @param yyyy-MM-dd
     * @author zhangyong
     * @获取当前的系统时间，并按照固定的格式初始话
     */
    public static Date getDateOfNowDate(String fFormatStr) {
        String nowDateString = dateTypeToString(new Date(), fFormatStr);
        return new DateUtil().parseDate(nowDateString);
    }

    /**
     * @ author zhangyong
     * @ 获取当月的第一天，2009-05-01
     */
    public static String getStringOfFirstDayInMonth() {
        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
        String temp = sdf.format(date);
        String firstDayInMoth = "";
        firstDayInMoth = temp + "-01";

        return firstDayInMoth;

    }

    /**
     * @ author zhangyong
     * @ 获取当月的第一天，2009-05-01
     */
    public static Date getDateOfFirstDayInMonth() {
        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
        String temp = sdf.format(date);
        String firstDayInMoth = "";
        firstDayInMoth = temp + "-01";

        return new DateUtil().parseDate(firstDayInMoth);

    }

    /**
     * Descrption:取得当前日期,格式为:yyyy-MM-dd HH:mm:ss
     *
     * @return String
     * @throws java.lang.Exception
     */
    public static String getPlusTime2(Date date) {

        if (date == null) return null;
        try {
            String nowDate = sdfLongTimePlus.format(date);
            return nowDate;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }


    /**
     * @param String strDate,String fFormatStr  eg :yyyy-MM-dd HH:mm:ss
     * @return Date 字符串形式日期装换成date类型
     * @author zhangyong
     */
    public static Date strDateConvertToDate(String strDate, String fFormatStr) {
        java.util.Date birthday = new java.util.Date();
        java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat(fFormatStr);
        try {
            birthday = sdf.parse(strDate);
            return birthday;
        } catch (ParseException e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * Date字符串形式日期装换成date类型，不进行日志的自动加算
     *
     * @param strDate
     * @param fFormatStr eg:yyyy-MM-dd HH:mm:ss
     * @author zhang_gl
     */
    public static Date strToDateNoCalculate(String strDate, String fFormatStr) {
        try {
            java.util.Date birthday = new java.util.Date();
            java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat(fFormatStr);
            sdf.setLenient(false);
            birthday = sdf.parse(strDate);
            return birthday;
        } catch (ParseException e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 基准日期增加年数、月数、天数、小时、分钟、秒数，参数为0时，不修改对应项目
     *
     * @param date 基准日期
     * @param date 年份增量
     * @param date 月份增量
     * @param date 日期增量
     * @param date 时钟增量
     * @param date 分钟增量
     * @param date 秒钟增量
     * @author zhang_gl
     */
    public static Date dateAddByProject(Date date, int year, int month, int day, int hour, int minute, int second) {
        try {
            if (date == null) {
                return null;
            }
            Calendar cal = Calendar.getInstance();
            cal.setTime(date);
            if (year != 0) {
                cal.add(Calendar.YEAR, year);
            }
            if (month != 0) {
                cal.add(Calendar.MONTH, month);
            }
            if (day != 0) {
                cal.add(Calendar.DAY_OF_MONTH, day);
            }
            if (hour != 0) {
                cal.add(Calendar.HOUR_OF_DAY, hour);
            }
            if (minute != 0) {
                cal.add(Calendar.MINUTE, minute);
            }
            if (second != 0) {
                cal.add(Calendar.SECOND, second);
            }

            return cal.getTime();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 得到当前日期时间,格式为yyyy-MM-dd hh:mm:ss.
     *
     * @return String
     */
    public static String getCurrDateTime() {
        java.sql.Timestamp date = new java.sql.Timestamp(System
                .currentTimeMillis());
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        return formatter.format(date);
    }

    public static String getDateStrNoSign(Date date) {
        if (null != date) {
            return sdfLongTime.format(date);
        }
        return null;
    }

    public static Date getDateFormString(String str) {
        if (!"".equals(str)) {
            try {
                return sdfLongTimePlus.parse(str);
            } catch (ParseException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

    /**
     * 判断当前日期是否在指定日期范围内
     */
    public static boolean isBelongCalendar(Date _time, String _from, String _to) {
        if (_from == null || _from.equals("") || _to == null || _to.equals("")) {
            return false;
        }
        Date from = stringToDate(_from);
        Date to = stringToDate(_to);
        Calendar date = Calendar.getInstance();
        date.setTime(_time);
        Calendar after = Calendar.getInstance();
        after.setTime(from);
        Calendar before = Calendar.getInstance();
        before.setTime(to);
        if (date.after(after) && date.before(before)) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * String类型转Date类型的时间
     */
    public static Date stringToDate(String time) {
        DateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        Date date = null;
        try {
            date = format.parse(time);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return date;
    }


    public static String objToStr(Object obj) {
        if (null == obj) {
            return "";
        }
        return obj.toString();
    }

    public static String removeComma(String str) {
        if (null == str || "".equals(str)) {
            return "";
        }
        if (str.indexOf(",") != -1) {
            return str.replaceAll(",", "");
        }
        return str;
    }

    /**获取上n个小时整点小时时间
     * @param date
     * @return
     */
    public static Date getLastHourTime(Date date,int n){
        Calendar ca = Calendar.getInstance();
        ca.setTime(date);
        ca.set(Calendar.MINUTE, 0);
        ca.set(Calendar.SECOND, 0);
        ca.set(Calendar.HOUR_OF_DAY, ca.get(Calendar.HOUR_OF_DAY)-n);
        date = ca.getTime();
        return date;
    }

    /**获取当前时间的整点小时时间
     * @param date
     * @return
     */
    public static Date getCurrHourTime(Date date){
        Calendar ca = Calendar.getInstance();
        ca.setTime(date);
        ca.set(Calendar.MINUTE, 0);
        ca.set(Calendar.SECOND, 0);
        date = ca.getTime();
        return date;
    }

    public static void main(String[] args) {
        Date time = new Date();
        System.out.println(isBelongCalendar(time, "2017-3-11 10:00:05", ""));
        System.out.println(isBelongCalendar(time, null, ""));
    }


}