java 日期时间处理类，java日期处理类,import java.

java 日期时间处理类，java日期处理类,import java.

import java.util.Calendar;import java.sql.Date;import java.text.SimpleDateFormat;import java.text.ParseException;/** * Utility to date time * @version 0.1 * @author Super Zhao */public class DateTimeUtil{    /**     * 由java.util.Date到java.sql.Date的类型转换     * @param date     * @return Date     */    public static Date getSqlDate (java.util.Date date)    {        return new Date (date.getTime() );    }    public static Date nowDate()    {        Calendar calendar = Calendar.getInstance();        return getSqlDate (calendar.getTime() );    }    /**     * 获得某一日期的后一天     * @param date     * @return Date     */    public static Date getNextDate (Date date)    {        Calendar calendar = Calendar.getInstance();        calendar.setTime (date);        int day = calendar.get (Calendar.DATE);        calendar.set (Calendar.DATE, day + 1);        return getSqlDate (calendar.getTime() );    }    /**     * 获得某一日期的前一天     * @param date     * @return Date     */    public static Date getPreviousDate (Date date)    {        Calendar calendar = Calendar.getInstance();        calendar.setTime (date);        int day = calendar.get (Calendar.DATE);        calendar.set (Calendar.DATE, day - 1);        return getSqlDate (calendar.getTime() );    }    /**     * 获得某年某月第一天的日期     * @param year     * @param month     * @return Date     */    public static Date getFirstDayOfMonth (int year, int month)    {        Calendar calendar = Calendar.getInstance();        calendar.set (Calendar.YEAR, year);        calendar.set (Calendar.MONTH, month - 1);        calendar.set (Calendar.DATE, 1);        return getSqlDate (calendar.getTime() );    }    /**     * 获得某年某月最后一天的日期     * @param year     * @param month     * @return Date     */    public static Date getLastDayOfMonth (int year, int month)    {        Calendar calendar = Calendar.getInstance();        calendar.set (Calendar.YEAR, year);        calendar.set (Calendar.MONTH, month);        calendar.set (Calendar.DATE, 1);        return getPreviousDate (getSqlDate (calendar.getTime() ) );    }    /**     * 由年月日构建java.sql.Date类型     * @param year     * @param month     * @param date     * @return Date     */    public static Date buildDate (int year, int month, int date)    {        Calendar calendar = Calendar.getInstance();        calendar.set (year, month - 1, date);        return getSqlDate (calendar.getTime() );    }    /**     * 取得某月的天数     * @param year     * @param month     * @return int     */    public static int getDayCountOfMonth (int year, int month)    {        Calendar calendar = Calendar.getInstance();        calendar.set (Calendar.YEAR, year);        calendar.set (Calendar.MONTH, month);        calendar.set (Calendar.DATE, 0);        return calendar.get (Calendar.DATE);    }    /**     * 获得某年某季度的最后一天的日期     * @param year     * @param quarter     * @return Date     */    public static Date getLastDayOfQuarter (int year, int quarter)    {        int month = 0;        if (quarter > 4)        {            return null;        }        else        {            month = quarter * 3;        }        return getLastDayOfMonth (year, month);    }    /**     * 获得某年某季度的第一天的日期     * @param year     * @param quarter     * @return Date     */    public static Date getFirstDayOfQuarter (int year, int quarter)    {        int month = 0;        if (quarter > 4)        {            return null;        }        else        {            month = (quarter - 1) * 3 + 1;        }        return getFirstDayOfMonth (year, month);    }    /**     * 获得某年的第一天的日期     * @param year     * @return Date     */    public static Date getFirstDayOfYear (int year)    {        return getFirstDayOfMonth (year, 1);    }    /**     * 获得某年的最后一天的日期     * @param year     * @return Date     */    public static Date getLastDayOfYear (int year)    {        return getLastDayOfMonth (year, 12);    }    /**     * String到java.sql.Date的类型转换     * @param param     * @return Date     */    public static java.sql.Date StringToDate (String param)    {        if (StringUtil.nullOrBlank (param) )        {            return null;        }        else        {            java.util.Date date = null;            try            {                SimpleDateFormat sdf = new SimpleDateFormat ("yyyy-MM-dd");                date = sdf.parse (param);                return new Date (date.getTime() );            }            catch (ParseException ex)            {                //ex.printStackTrace();                return null;            }        }    }}