java技术获取本周、上周、本月的开始结束时间
计算本周周一和周日日期
/**
* 计算本周周一和周日日期
*
* @return MAP
* @author jiangfengcheng
*/
private static HashMap<String, String> getWeekByDate() {
HashMap<String, String> dayMap = new HashMap<String, String>();
SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd”); // 设置时间格式
Calendar cal = Calendar.getInstance();
cal.setTime(new Date());
// 判断要计算的日期是否是周日，如果是则减一天计算周六的，否则会出问题，计算到下一周去了
int dayWeek = cal.get(Calendar.DAY_OF_WEEK);// 获得当前日期是一个星期的第几天
if (1 == dayWeek) {
cal.add(Calendar.DAY_OF_MONTH, -1);
}
System.out.println(“要计算日期为:” + sdf.format(cal.getTime())); // 输出要计算日期
cal.setFirstDayOfWeek(Calendar.MONDAY);// 设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一
int day = cal.get(Calendar.DAY_OF_WEEK);// 获得当前日期是一个星期的第几天
cal.add(Calendar.DATE, cal.getFirstDayOfWeek() – day);// 根据日历的规则，给当前日期减去星期几与一个星期第一天的差值
String imptimeBegin = sdf.format(cal.getTime());
System.out.println(“所在周星期一的日期：” + imptimeBegin);
dayMap.put(“Monday”, imptimeBegin);
cal.add(Calendar.DATE, 6);
String imptimeEnd = sdf.format(cal.getTime());
System.out.println(“所在周星期日的日期：” + imptimeEnd);
dayMap.put(“SunDay”, imptimeEnd);
return dayMap;
}
根据当前日期获得上周的日期区间（上周周一和周日日期）
/**
* 根据当前日期获得上周的日期区间（上周周一和周日日期）
*
* @return
* @author jiangfengcheng
*/
public static HashMap<String, String> getLastTimeInterval() {
HashMap<String, String> dayMap = new HashMap<String, String>();
SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd”); // 设置时间格式
Calendar calendar1 = Calendar.getInstance();
Calendar calendar2 = Calendar.getInstance();
int dayOfWeek = calendar1.get(Calendar.DAY_OF_WEEK) – 1;
int offset1 = 1 – dayOfWeek;
int offset2 = 7 – dayOfWeek;
calendar1.add(Calendar.DATE, offset1 – 7);
calendar2.add(Calendar.DATE, offset2 – 7);
// 上周星期一
String lastBeginDate = sdf.format(calendar1.getTime());
System.out.println(lastBeginDate);
dayMap.put(“Monday”, lastBeginDate);
// 上周星期日
String lastEndDate = sdf.format(calendar2.getTime());
System.out.println(lastEndDate);
dayMap.put(“SunDay”, lastEndDate);
return dayMap;
}
获得本月第一天0点时间本月最后一天24点时间
/**
* 获得本月第一天0点时间本月最后一天24点时间
* @return
* @author jiangfengcheng
*/
public static HashMap<String, String> getTimesMonth() {
HashMap<String, String> dayMap = new HashMap<String, String>();
SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd”); // 设置时间格式
Calendar cals = Calendar.getInstance();
cals.set(cals.get(Calendar.YEAR), cals.get(Calendar.MONDAY), cals.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
cals.set(Calendar.DAY_OF_MONTH, cals.getActualMinimum(Calendar.DAY_OF_MONTH));
Calendar cale = Calendar.getInstance();
cale.set(cale.get(Calendar.YEAR), cale.get(Calendar.MONDAY), cale.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
cale.set(Calendar.DAY_OF_MONTH, cale.getActualMaximum(Calendar.DAY_OF_MONTH));
cale.set(Calendar.HOUR_OF_DAY, 24);
// 本月第一天
String lastBeginDate = sdf.format(cals.getTime());
System.out.println(lastBeginDate);
dayMap.put(“Months”, lastBeginDate);
// 本月第二天
String lastEndDate = sdf.format(cale.getTime());
System.out.println(lastEndDate);
dayMap.put(“Monthe”, lastEndDate);return dayMap;
}
用法
String two = null;
String three = null;// 本周
if (“1”.equals(type)) {
two = getWeekByDate().get(“Monday”);
three = getWeekByDate().get(“SunDay”);
// 上周
} else if (“2”.equals(type)) {
two = getLastTimeInterval().get(“Monday”);
three = getLastTimeInterval().get(“SunDay”);
// 本月
} else if (“3”.equals(type)) {
two = getTimesMonth().get(“Months”);
three = getTimesMonth().get(“Monthe”);
}