获取本月周次和日期时间段信息

package com.wdcloud.monitoring.common;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

import com.wdcloud.monitoring.Model.WeekInfoModel;

public class DateUtils {

//是否打印日志
private static boolean isLog = false;

/**
* 获取本月周次和日期时间段信息
*
* @return
*/
public static List<WeekInfoModel> getThisMonthWeekDate() {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
List<WeekInfoModel> list = new ArrayList<WeekInfoModel>();

// 1 获取本月的第一天
Date firstDayOfMonth = getFirstDayOfMonth();
Calendar firstDayOfMonthCal = Calendar.getInstance();
firstDayOfMonthCal.setFirstDayOfWeek(Calendar.MONDAY);
firstDayOfMonthCal.setTime(firstDayOfMonth);

// 2 获取本月第一周第一天
Date firstWeekFirstDay = getFirstDayOfFirstWeekOfMonth();
Calendar firstWeekFirstDayCal = Calendar.getInstance();
firstWeekFirstDayCal.setFirstDayOfWeek(Calendar.MONDAY);
firstWeekFirstDayCal.setTime(firstWeekFirstDay);

// 3 获取本次周期起止时间
Date sDate = null;// 本月第一周第一天
Date eDate = null;// 本月最后一周最后一天
Calendar sCal = Calendar.getInstance();
Calendar eCal = Calendar.getInstance();
sCal.setFirstDayOfWeek(Calendar.MONDAY);
sCal.setFirstDayOfWeek(Calendar.MONDAY);

// 获取本月第一天是周几
int weekDay = firstDayOfMonthCal.get(Calendar.DAY_OF_WEEK) - 1;

// 如果是周末，起始时间就是本月第一周第一天
// 否则起始时间就是本月第一周第一天 倒退7天
if (weekDay == 6 || weekDay == 0 || weekDay == 1) {// 周六或周天
sDate = firstWeekFirstDay;
} else {
firstWeekFirstDayCal.getTime();
firstWeekFirstDayCal.add(Calendar.DATE, -7);
sDate = firstWeekFirstDayCal.getTime();
}
sCal.setTime(sDate);

// 结束时间是起始时间+34天（5周）
eCal.setTime(sDate);
eDate = eCal.getTime();
eCal.add(Calendar.DATE, 34);
eDate = eCal.getTime();

Date cDate = new Date();
if (cDate.getTime() < eDate.getTime()) {
eDate = cDate;
}

if (isLog) {
System.out.println(" 本月统计起止时间是：" + format.format(sDate) + " 到 "
+ format.format(eDate));
System.out
.println("-------------------------------------------------------------------------------");
}

// 4 循环得到周次信息
for (int i = 0; i < 5; i++) {// 循环5周次
WeekInfoModel model = new WeekInfoModel();
Calendar endTime = Calendar.getInstance();
endTime.setFirstDayOfWeek(Calendar.MONDAY);
endTime.setTime(sDate);
endTime.set(Calendar.HOUR_OF_DAY, 23);
endTime.set(Calendar.MINUTE, 59);
endTime.set(Calendar.SECOND, 59);
endTime.add(Calendar.DATE, 6);

model.setIndexOfWeek(i + 1);
model.setStartDateOfWeek(sDate);
model.setEndDateOfWeek(endTime.getTime());

Date currDate = new Date();
// 如果当前时间在某个周次内
if (sDate.getTime() < currDate.getTime()
&& endTime.getTime().getTime() > currDate.getTime()) {
model.setEndDateOfWeek(currDate);

if (isLog) {
System.out.println(" 本月第" + (i + 1) + "周起止时间是："
+ format.format(sDate) + " 到 "
+ format.format(currDate));
}
list.add(model);
break;
}
if (isLog) {
System.out.println(" 本月第" + (i + 1) + "周起止时间是："
+ format.format(sDate) + " 到 "
+ format.format(endTime.getTime()));
}
list.add(model);

sCal.add(Calendar.DATE, 7);
sDate = sCal.getTime();
}

return list;
}

// 获取本月第一天
public static Date getFirstDayOfMonth() {
Calendar now = Calendar.getInstance();
// Date date = new Date(2015 - 1900, 12 - 1, 1);
// now.setTime(date);
now.set(Calendar.DATE, now.getActualMinimum(Calendar.DATE));
now.set(Calendar.HOUR_OF_DAY, 0);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
return now.getTime();
}

// 获取本月第一周第一天
public static Date getFirstDayOfFirstWeekOfMonth() {
Calendar now = Calendar.getInstance();
now.setFirstDayOfWeek(Calendar.MONDAY);
now.setTime(getFirstDayOfMonth());

int i = 1;
while (now.get(Calendar.DAY_OF_WEEK) != Calendar.MONDAY) {
now.set(Calendar.DAY_OF_MONTH, i++);// 设置这个月的星期1 为几号
}

Date firstMonday = now.getTime();// 取得日期和时间
String dtStr = new SimpleDateFormat("YYYY-MM-dd").format(firstMonday);// 格式化日期
if (isLog) {
System.out
.println("-------------------------------------------------------------------------------");
System.out.println(" 本月第一周第一天是：" + dtStr);
System.out
.println("-------------------------------------------------------------------------------");
}
return now.getTime();
}

/**
* 获取本周周次和日期时间段信息
*
* @return
*/
public static WeekInfoModel getThisWeekDate() {

WeekInfoModel model = new WeekInfoModel();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

// 根据今天的时间获取本周属于本月的第几周
Calendar now = Calendar.getInstance();
now.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY); // 获取本周一的日期

int wom = now.get(Calendar.WEEK_OF_MONTH);
model.setIndexOfWeek(wom);

// 根据今天的时间获取本周的开始时间
now.set(Calendar.HOUR_OF_DAY, 0);
now.set(Calendar.MINUTE, 0);
now.set(Calendar.SECOND, 0);
now.set(Calendar.MILLISECOND, 0);
System.out.println("********" + now.get(Calendar.YEAR) + "年"
+ ((now.get(Calendar.MONTH)) + 1) + "月第" + wom + "周星期一的日期是："
+ df.format(now.getTime()));
model.setStartDateOfWeek(now.getTime());

// 根据今天的时间获取本周的结束时间
now.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
now.add(Calendar.WEEK_OF_YEAR, 1);
now.set(Calendar.HOUR_OF_DAY, 23);
now.set(Calendar.MINUTE, 59);
now.set(Calendar.SECOND, 59);
now.set(Calendar.MILLISECOND, 999);
System.out.println("********" + now.get(Calendar.YEAR) + "年"
+ ((now.get(Calendar.MONTH)) + 1) + "月第" + wom + "周星期天的日期是："
+ df.format(now.getTime()));
model.setEndDateOfWeek(now.getTime());

return model;
}

}