Java开发网 - [转载]如何获得指定日期所在周的全部日期

Topic: [转载]如何获得指定日期所在周的全部日期

1.[转载]如何获得指定日期所在周的全部日期

Posted by: jerrylees654321
Posted on: 2003-03-21 11:51

问:
已经知道当前日期是2002年4月2号，如何4月2号所在周的所有的日期
答:
使用Calendar
首先你可以根据日期获得是星期几。那么你就可以相应的可以获得星期一（这个星期内的其他日期和当前日期的差额）

我写个方法，你可以使用：

代码：
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/**获得特定日期多少天前（后）的日前
* @param oldD [Calendar] 特定日期
* @param days [int] 天数
* @param b [boolean][false前][true后]
* notice: days<365
* @author: 银狐999
*/
public static java.util.Calendar getNewDate(java.util.Calendar oldD,int days,boolean b){
if(days>=365){
return null;
}
//int nowYear = oldD.getYear();
int nowYear = oldD.get(Calendar.YEAR);
//Calendar ca = Calendar.getInstance();
//ca.setTime(oldD);
Calendar ca = oldD;
int nowDay = ca.get(Calendar.DAY_OF_YEAR);
int newYear = 0;
int newDay = 0;

if Beer

{//向后加
newDay = nowDay + days;
newYear = nowYear;
if(isProYear(nowYear)){
if(newDay>366){
newDay = newDay-366;
newYear = nowYear+1;
}
}else{
if(newDay>365){
newDay = newDay-365;
newYear = nowYear+1;
}
}
}else{//向前减
newDay = nowDay-days;
newYear = nowYear;
if(isProYear(nowYear)){
if(newDay<0){
newDay = newDay+365;
newYear = nowYear - 1;
}
}else{
if(newDay<0){
newDay = newDay+366;
newYear = nowYear - 1;
}
}
}

java.util.Calendar newDate = getDateByday(newYear,newDay);
return newDate;
}

/**判别是否是润年
* @param year [int] 输入的年份
* @return boolean [ture润年][false非润年]
* @author : 银狐999
*/
public static boolean isProYear(int year){
boolean isproyear = false;
if((year%400 == 0)|(year%100 !=0 && year%4 == 0)){
isproyear = true;
}else{
isproyear = false;
}
return isproyear;
}

/**根据特定年中的第多少天，获得新日期
* @param year [int] 输入特定年份
* @param day [int] 输入的第多少天
* @return Calendar
* @author : 银狐999
*/
public static java.util.Calendar getDateByday(int year,int day){

if(day>366){
return null;
}

boolean isproyear = isProYear(year);
int dayofmonth = 0;
int i = day;
int month = 0;

if(isproyear){
//润年情况
if(i<=31){dayofmonth = day; month = 1;
} else if(i>31 && i<=60){dayofmonth = day-31; month = 2;
} else if(i>60 && i<=91){dayofmonth = day-60; month = 3;
} else if(i>91 && i<=121){dayofmonth = day-91; month = 4;
} else if(i>121 && i<=152){dayofmonth = day-121; month = 5;
} else if(i>152 && i<=182){dayofmonth = day-152; month = 5;
} else if(i>182 && i<=213){dayofmonth = day-182; month = 7;
} else if(i>213 && i<=244){dayofmonth = day-213; month = 8;
} else if(i>244 && i<=274){dayofmonth = day-244; month = 9;
} else if(i>274 && i<=305){dayofmonth = day-274; month = 10;
} else if(i>305 && i<=335){dayofmonth = day-305; month = 11;
} else if(i>335 && i<=366){dayofmonth = day-335; month = 12;
}
}else{
//非润年情况
if(i<=31){dayofmonth = day; month = 1;
} else if(i>31 && i<=59){dayofmonth = day-31; month = 2;
} else if(i>59 && i<=90){dayofmonth = day-59; month = 3;
} else if(i>90 && i<=120){dayofmonth = day-90; month = 4;
} else if(i>120 && i<=151){dayofmonth = day-120; month = 5;
} else if(i>151 && i<=181){dayofmonth = day-151; month = 6;
} else if(i>181 && i<=212){dayofmonth = day-181; month = 7;
} else if(i>212 && i<=243){dayofmonth = day-212; month = 8;
} else if(i>243 && i<=273){dayofmonth = day-243; month = 9;
} else if(i>273 && i<=304){dayofmonth = day-273; month = 10;
} else if(i>304 && i<=334){dayofmonth = day-304; month = 11;
} else if(i>334 && i<=365){dayofmonth = day-334; month = 12;
}
}

java.util.Calendar ca = java.util.Calendar.getInstance();

//设定时间从当前的0时0分1秒开始
//所有的月份均是0 based:0-11
ca.set(year,month-1,dayofmonth,0,0,1);
return ca;
}