java中处理日期时间的类_java 日期时间处理类详解
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;
}
}
}
}