import java.text.DateFormat;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

/**

 * 说明：日期处理

 * @version

 */

public class DateUtil {

    private final static SimpleDateFormat sdfYear = new SimpleDateFormat("yyyy");

    private final static SimpleDateFormat sdfDay = new SimpleDateFormat("yyyy-MM-dd");

    private final static SimpleDateFormat sdfDays = new SimpleDateFormat("yyyyMMdd");

    private final static SimpleDateFormat sdfTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    private final static SimpleDateFormat sdfTimes = new SimpleDateFormat("yyyyMMddHHmmss");

    /**

     * 获取YYYY格式

     * @return

     */

    public static String getSdfTimes() {

        return sdfTimes.format(new Date());

    }

    /**

     * 获取YYYY格式

     * @return

     */

    public static String getYear() {

        return sdfYear.format(new Date());

    }

    /**

     * 获取YYYY-MM-DD格式

     * @return

     */

    public static String getDay() {

        return sdfDay.format(new Date());

    }

    /**

     * 获取YYYYMMDD格式

     * @return

     */

    public static String getDays(){

        return sdfDays.format(new Date());

    }

    /**

     * 获取YYYY-MM-DD HH:mm:ss格式

     * @return

     */

    public static String getTime() {

        return sdfTime.format(new Date());

    }

    /**

    * @Title: compareDate

    * @Description: TODO(日期比较，如果s>=e 返回true 否则返回false)

    * @param s

    * @param e

    * @return boolean

    * @throws

    * @author fh

     */

    public static boolean compareDate(String s, String e) {

        if(fomatDate(s)==null||fomatDate(e)==null){

            return false;

        }

        return fomatDate(s).getTime() >=fomatDate(e).getTime();

    }

    /**

     * 格式化日期

     * @return

     */

    public static Date fomatDate(String date) {

        DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");

        try {

            return fmt.parse(date);

        } catch (ParseException e) {

            e.printStackTrace();

            return null;

        }

    }

    /**

     * 校验日期是否合法

     * @return

     */

    public static boolean isValidDate(String s) {

        DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");

        try {

            fmt.parse(s);

            return true;

        } catch (Exception e) {

            // 如果throw java.text.ParseException或者NullPointerException，就说明格式不对

            return false;

        }

    }

    /**

     * @param startTime

     * @param endTime

     * @return

     */

    public static int getDiffYear(String startTime,String endTime) {

        DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");

        try {

            //long aa=0;

            int years=(int) (((fmt.parse(endTime).getTime()-fmt.parse(startTime).getTime())/ (1000 * 60 * 60 * 24))/365);

            return years;

        } catch (Exception e) {

            // 如果throw java.text.ParseException或者NullPointerException，就说明格式不对

            return 0;

        }

    }

    /**

     * <li>功能描述：时间相减得到天数

     * @param beginDateStr

     * @param endDateStr

     * @return

     * long

     * @author Administrator

     */

    public static long getDaySub(String beginDateStr,String endDateStr){

        long day=0;

        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");

        Date beginDate = null;

        Date endDate = null;

            try {

                beginDate = format.parse(beginDateStr);

                endDate= format.parse(endDateStr);

            } catch (ParseException e) {

                e.printStackTrace();

            }

            day=(endDate.getTime()-beginDate.getTime())/(24*60*60*1000);

            //System.out.println("相隔的天数="+day);

        return day;

    }

    /**

     * 得到n天之后的日期

     * @param days

     * @return

     */

    public static String getAfterDayDate(String days) {

        int daysInt = Integer.parseInt(days);

        Calendar canlendar = Calendar.getInstance(); // java.util包

        canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动

        Date date = canlendar.getTime();

        SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

        String dateStr = sdfd.format(date);

        return dateStr;

    }

    /**

     * 得到n天之后是周几

     * @param days

     * @return

     */

    public static String getAfterDayWeek(String days) {

        int daysInt = Integer.parseInt(days);

        Calendar canlendar = Calendar.getInstance(); // java.util包

        canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动

        Date date = canlendar.getTime();

        SimpleDateFormat sdf = new SimpleDateFormat("E");

        String dateStr = sdf.format(date);

        return dateStr;

    }

    public static void main(String[] args) {

        System.out.println(getDays());

        System.out.println(getAfterDayWeek("3"));

    }

}