DateUtils 方便的date 处理工具

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Locale;

/**
 * @version 1.0.0
 * @create 2008-07-24 10:10
 * @see 处理时间（包括时间格式的类）
 */
public class DateUtils {
    /**
     * 取时间年的格式代码
     */
    public static String YEAR = "yyyy";

    /**
     * 取时间月的格式代码
     */
    public static String MONTH = "MM";

    /**
     * 取时间日的格式代码
     */
    public static String DAY = "dd";

    /**
     * 取时间时的格式代码
     */
    public static String HOUR = "hh";

    /**
     * 取时间24小时制的格式代码
     */
    public static String HOUR_24 = "HH";

    /**
     * 取时间分的格式代码
     */
    public static String MIMUTE = "mm";

    /**
     * 取时间秒的格式代码
     */
    public static String SECOND = "ss";

    /**
     * 取时间毫秒的格式代码
     */
    public static String MILLISECOND = "SS";

    /**
     * 格式为yyyy-MM-dd的时间
     */
    public static String YMD_FORMAT = YEAR + "-" + MONTH + "-" + DAY;
    /**
     * 格式为yyyy-MM-dd HH:mm:ss的时间
     */
    public static String YMDHMS_FORMAT = YEAR + "-" + MONTH + "-" + DAY + " "
            + HOUR_24 + ":" + MIMUTE + ":" + SECOND;

    /**
     * 格式为yyyy-MM-dd HH:mm:ss:SS的时间
     */
    public static String UTILTIME_FORMAT = YEAR + "-" + MONTH + "-" + DAY + " "
            + HOUR_24 + ":" + MIMUTE + ":" + SECOND + ":" + MILLISECOND;

    /**
     * 格式为yyyyMMddHHmmssSS的时间
     */
    public static String CRITERIONTIME_FORMAT = YEAR + MONTH + DAY + HOUR_24
            + MIMUTE + SECOND + MILLISECOND;

    public static String getYearMonthDay() {
        return getDateByFormat(YEAR + "-" + MONTH + "-" + DAY);
    }

    /**
     * @see 返回格式为yyyy-MM-dd HH:mm:ss:SS的时间字符串
     * @return String date
     */
    public static String getNOWTime_0() {
        return getDateByFormat(UTILTIME_FORMAT);
    }

    /**
     * @see 返回格式为yyyyMMddHHmmssSS的时间字符串
     * @return String date
     */
    public static String getNOWTime_1() {
        return getDateByFormat(CRITERIONTIME_FORMAT);
    }

    /**
     * @see 获得指定时间格式
     * @param String
     *            format 时间格式
     * @return String dateStr 返回获得相应格式时间的字符串
     */
    public static String getDateByFormat(String format) {
        String dateStr = "";
        try {
            if (format != null) {
                Date date = new Date(System.currentTimeMillis());
                SimpleDateFormat simFormat = new SimpleDateFormat(format,
                        Locale.CHINA);
                dateStr = simFormat.format(date);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return dateStr;
    }

    /**
     * @see 获得指定时间格式
     * @param Date
     *            date 时间
     * @param String
     *            format 时间格式
     * @return String dateStr 返回获得相应格式时间的字符串
     */
    public static String getDateByFormatYMD(Date date) {
        String dateStr = "";
        try {
            SimpleDateFormat simFormat = new SimpleDateFormat(YMD_FORMAT,
                    Locale.CHINA);
            dateStr = simFormat.format(date);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return dateStr;
    }

    /**
     * @see 获得指定时间格式
     * @param Date
     *            date 时间
     * @param String
     *            format 时间格式
     * @return String dateStr 返回获得相应格式时间的字符串
     */
    public static String getDateByFormat(Date date, String format) {
        String dateStr = "";
        try {
            if (format != null) {
                SimpleDateFormat simFormat = new SimpleDateFormat(format,
                        Locale.CHINA);
                dateStr = simFormat.format(date);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return dateStr;
    }

    /**
     * @see 获得当前时间
     * @return Date date
     */
    public static Date getNOWTime() {
        return new Date(System.currentTimeMillis());
    }

    /**
     * @see 把字符串类型的时间转换为yyyy-MM-dd的时间格式
     */
    public static Date getDateByStrToYMD(String str) {
        Date date = null;
        if (str != null && str.trim().length() > 0) {
            DateFormat dFormat = new SimpleDateFormat(YMD_FORMAT);
            try {
                date = dFormat.parse(str);
            } catch (ParseException e) {
                e.printStackTrace();
            }
        }
        return date;
    }

    /**
     * @see 把字符串类型的时间转换为自定义格式的时间
     */
    public static Date getDateByStrToFormat(String format, String str) {
        DateFormat dFormat = new SimpleDateFormat(format);
        Date date = null;
        try {
            if (str != null) {
                date = dFormat.parse(str);
            }
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return date;
    }

    /**
     * 功能：判断输入年份是否为闰年<br>
     *
     * @param year
     * @return 是：true 否：false
     * @author pure
     */
    public static boolean leapYear(int year) {
        boolean leap;
        if (year % 4 == 0) {
            if (year % 100 == 0) {
                if (year % 400 == 0) {
                    leap = true;
                } else {
                    leap = false;
                }
            } else {
                leap = true;
            }
        } else
            leap = false;
        return leap;
    }

    /**
     * 功能：得到指定月份的月底 格式为：xxxx-yy-zz (eg: 2007-12-31)<br>
     *
     * @param String
     * @return String
     */
    public static String getEndOfMonth(String str) {
        int tyear = Integer.parseInt(getDateByFormat(getDateByStrToYMD(str),
                YEAR));
        int tmonth = Integer.parseInt(getDateByFormat(getDateByStrToYMD(str),
                MONTH));
        String strtmonth = null;
        String strZ = null;
        if (tmonth == 1 || tmonth == 3 || tmonth == 5 || tmonth == 7
                || tmonth == 8 || tmonth == 10 || tmonth == 12) {
            strZ = "31";
        }
        if (tmonth == 4 || tmonth == 6 || tmonth == 9 || tmonth == 11) {
            strZ = "30";
        }
        if (tmonth == 2) {
            if (leapYear(tyear)) {
                strZ = "29";
            } else {
                strZ = "28";
            }
        }
        strtmonth = tmonth >= 10 ? String.valueOf(tmonth) : ("0" + tmonth);
        return tyear + "-" + strtmonth + "-" + strZ;
    }

    public static String getEndOfMonth(int tyear, int tmonth) {
        String strtmonth = null;
        String strZ = null;
        if (tmonth == 1 || tmonth == 3 || tmonth == 5 || tmonth == 7
                || tmonth == 8 || tmonth == 10 || tmonth == 12) {
            strZ = "31";
        }
        if (tmonth == 4 || tmonth == 6 || tmonth == 9 || tmonth == 11) {
            strZ = "30";
        }
        if (tmonth == 2) {
            if (leapYear(tyear)) {
                strZ = "29";
            } else {
                strZ = "28";
            }
        }
        strtmonth = tmonth >= 10 ? String.valueOf(tmonth) : ("0" + tmonth);
        return tyear + "-" + strtmonth + "-" + strZ;
    }

    /**
     * 功能：得到指定月份的月初 格式为：xxxx-yy-zz (eg: 2007-12-01)<br>
     *
     * @param String
     * @return String
     */
    public static String getStartOfMonth(int tyear, int tmonth) {
        String strtmonth = tmonth >= 10 ? String.valueOf(tmonth)
                : ("0" + tmonth);
        return tyear + "-" + strtmonth + "-" + "01";
    }

    public static String getStartOfMonth(String str) {
        int tyear = Integer.parseInt(getDateByFormat(getDateByStrToYMD(str),
                YEAR));
        int tmonth = Integer.parseInt(getDateByFormat(getDateByStrToYMD(str),
                MONTH));
        String strtmonth = tmonth >= 10 ? String.valueOf(tmonth)
                : ("0" + tmonth);
        return tyear + "-" + strtmonth + "-" + "01";
    }

    /**
     * 功能：得到指定月份的月初 格式为：xxxx-yy-zz (eg: 2007-12-01)<br>
     *
     * @param String
     * @return String
     */
    public static int getMonthCountBySQU(String start, String end) {
        int syear = Integer.parseInt(getDateByFormat(getDateByStrToYMD(start),
                YEAR));
        int smonth = Integer.parseInt(getDateByFormat(getDateByStrToYMD(start),
                MONTH));
        int eyear = Integer.parseInt(getDateByFormat(getDateByStrToYMD(start),
                YEAR));
        int emonth = Integer.parseInt(getDateByFormat(getDateByStrToYMD(start),
                MONTH));
        return (eyear - syear) * 12 + (emonth - smonth) + 1;
    }

    /**
     * 获得时间序列 EG:2008-01-01~2008-01-31,2008-02-01~2008-02-29
     */
    public static List getMonthSqu(String fromDate, String toDate) {
        List list = new ArrayList();
        int count = getMonthCountBySQU(fromDate, toDate);
        int syear = Integer.parseInt(getDateByFormat(
                getDateByStrToYMD(fromDate), YEAR));
        int smonth = Integer.parseInt(getDateByFormat(
                getDateByStrToYMD(fromDate), MONTH));
        int eyear = Integer.parseInt(getDateByFormat(getDateByStrToYMD(toDate),
                YEAR));
        String startDate = fromDate;
        String endDate = "";
        for (int i = 1; i <= count; i++) {
            if (syear <= eyear) {
                startDate = getStartOfMonth(syear, smonth);
                endDate = getEndOfMonth(syear, smonth);
                list.add(startDate + "~" + endDate);
                System.out.println(startDate + "~" + endDate);
                if (smonth == 13) {
                    smonth = 1;
                    syear++;
                }
                smonth++;
            }
        }
        return list;
    }

    /**
     * 通过传入的时间来获得所属周内的时间
     *
     * @param start
     * @param num
     * @return
     */
    public static String getDateOFWeekByDate(String start, int num) {
        Date dd = getDateByStrToYMD(start);
        Calendar c = Calendar.getInstance();
        c.setTime(dd);
        if (num == 1) // 返回星期一所在的日期
            c.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        else if (num == 2) // 返回星期二所在的日期
            c.set(Calendar.DAY_OF_WEEK, Calendar.TUESDAY);
        else if (num == 3) // 返回星期三所在的日期
            c.set(Calendar.DAY_OF_WEEK, Calendar.WEDNESDAY);
        else if (num == 4) // 返回星期四所在的日期
            c.set(Calendar.DAY_OF_WEEK, Calendar.THURSDAY);
        else if (num == 5) // 返回星期五所在的日期
            c.set(Calendar.DAY_OF_WEEK, Calendar.FRIDAY);
        else if (num == 6) // 返回星期六所在的日期
            c.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY);
        else if (num == 0) // 返回星期日所在的日期
            c.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
        return getDateByFormatYMD(c.getTime());
    }
}