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java得到某年某周的第一天實(shí)現(xiàn)思路及代碼

更新時(shí)間：2013年01月22日 11:00:27 作者：

某年某周的第一天，此功能如何使用java編程得到呢？既然有了問(wèn)題就有解決方法，感興趣的朋友可以了解下本文，或許會(huì)給你帶來(lái)意想不到的收獲哦

直接上代碼

 
import java.util.Calendar; 
import java.util.Date; 
import org.apache.commons.logging.Log; 
import org.apache.commons.logging.LogFactory; 
/** 
* 日期工具類(lèi) 
* @author WXQ 
* 
*/ 
public class DateUtils { 

private static final Log log = LogFactory.getLog(DateUtils.class); 
/** 
* 取得當(dāng)前日期是多少周 
* 
* @param date 
* @return 
*/ 
public static int getWeekOfYear(Date date) { 
Calendar c = Calendar.getInstance(); 
c.setFirstDayOfWeek(Calendar.MONDAY); 
/**設(shè)置一年中第一個(gè)星期所需的最少天數(shù)，例如，如果定義第一個(gè)星期包含一年第一個(gè)月的第一天，則使用值 1 調(diào)用此方法。 
* 如果最少天數(shù)必須是一整個(gè)星期，則使用值 7 調(diào)用此方法。 **/ 
c.setMinimalDaysInFirstWeek(1); 
c.setTime(date); 
return c.get(Calendar.WEEK_OF_YEAR); 
} 
/** 
* 得到某一年周的總數(shù) 
* 
* @param year 
* @return 
*/ 
public static int getMaxWeekNumOfYear(int year) { 
Calendar c = Calendar.getInstance(); 
c.set(year, Calendar.DECEMBER, 31, 23, 59, 59); 
return getWeekOfYear(c.getTime()); 
} 
/** 
* 得到某年某周的第一天 
* 
* @param year 
* @param week 
* @return 
*/ 
public static Date getFirstDayOfWeek(int year, int week) { 
Calendar c = Calendar.getInstance(); 
c.set(Calendar.YEAR, year); 
c.set(Calendar.WEEK_OF_YEAR, week); 
c.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);//設(shè)置周一 
c.setFirstDayOfWeek(Calendar.MONDAY); 
return c.getTime(); 
} 

/** 
* 得到某年某周的最后一天 
* 
* @param year 
* @param week 
* @return 
*/ 
public static Date getLastDayOfWeek(int year, int week) { 
Calendar c = Calendar.getInstance(); 
c.set(Calendar.YEAR, year); 
c.set(Calendar.WEEK_OF_YEAR, week); 
c.setFirstDayOfWeek(Calendar.MONDAY); 
c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek() + 6); // Sunday 

return c.getTime(); 
} 

/** 
* 得到某年某月的第一天 
* 
* @param year 
* @param month 
* @return 
*/ 
public static Date getFirstDayOfMonth(int year, int month) { 
Calendar c = Calendar.getInstance(); 
c.set(Calendar.YEAR, year); 
c.set(Calendar.MONTH, month-1); 
c.set(Calendar.DAY_OF_MONTH, c.getActualMinimum(Calendar.DAY_OF_MONTH)); 
return c.getTime(); 
} 

/** 
* 得到某年某月的最后一天 
* 
* @param year 
* @param month 
* @return 
*/ 
public static Date getLastDayOfMonth(int year, int month) { 
Calendar c = Calendar.getInstance(); 
c.set(Calendar.YEAR, year); 
c.set(Calendar.MONTH, month-1); 
c.set(Calendar.DAY_OF_MONTH, c.getActualMaximum(Calendar.DAY_OF_MONTH)); 
return c.getTime(); 
} 
/** 
* 得到某年某季度第一天 
* 
* @param year 
* @param quarter 
* @return 
*/ 
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); 
} 
/** 
* 得到某年某季度最后一天 
* 
* @param year 
* @param quarter 
* @return 
*/ 
public static Date getLastDayOfQuarter(int year, int quarter) { 
int month = 0; 
if (quarter > 4) { 
return null; 
} else { 
month = quarter * 3; 
} 
return getLastDayOfMonth(year, month); 
} 
/** 
* 得到某年第一天 
* 
* @param year 
* @return 
*/ 
public static Date getFirstDayOfYear(int year) { 
return getFirstDayOfQuarter(year,1); 
} 

/** 
* 得到某年最后一天 
* 
* @param year 
* @return 
*/ 
public static Date getLastDayOfYear(int year) { 
return getLastDayOfQuarter(year,4); 
} 

public static void main(String[] args) { 
log.info(getFirstDayOfWeek(2013,1)); 
log.info(getLastDayOfWeek(2013,1)); 

log.info(getFirstDayOfMonth(2013,2)); 
log.info(getLastDayOfMonth(2013,2)); 

log.info(getFirstDayOfQuarter(2013,2)); 
log.info(getLastDayOfQuarter(2013,2)); 

log.info(getFirstDayOfYear(2013)); 
log.info(getLastDayOfYear(2013)); 

} 
} 