java获取当前年、半年、季度、月、日、小时 开始结束时间等

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

/**
* 获取  当前年、半年、季度、月、日、小时 开始结束时间
*/

private final SimpleDateFormat shortSdf;
private final SimpleDateFormat longHourSdf;
private final SimpleDateFormat longSdf;

public RemindDateUtils(){
this.shortSdf = new SimpleDateFormat("yyyy-MM-dd");
this.longHourSdf = new SimpleDateFormat("yyyy-MM-dd HH");
this.longSdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
}

/**
* 获得本周的第一天，周一
*
* @return
*/
public   Date getCurrentWeekDayStartTime() {
Calendar c = Calendar.getInstance();
try {
int weekday = c.get(Calendar.DAY_OF_WEEK) - 2;
c.add(Calendar.DATE, -weekday);
c.setTime(longSdf.parse(shortSdf.format(c.getTime()) + " 00:00:00"));
} catch (Exception e) {
e.printStackTrace();
}
return c.getTime();
}

/**
* 获得本周的最后一天，周日
*
* @return
*/
public   Date getCurrentWeekDayEndTime() {
Calendar c = Calendar.getInstance();
try {
int weekday = c.get(Calendar.DAY_OF_WEEK);
c.add(Calendar.DATE, 8 - weekday);
c.setTime(longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59"));
} catch (Exception e) {
e.printStackTrace();
}
return c.getTime();
}

/**
* 获得本天的开始时间，即2012-01-01 00:00:00
*
* @return
*/
public   Date getCurrentDayStartTime() {
Date now = new Date();
try {
now = shortSdf.parse(shortSdf.format(now));
} catch (Exception e) {
e.printStackTrace();
}
return now;
}

/**
* 获得本天的结束时间，即2012-01-01 23:59:59
*
* @return
*/
public   Date getCurrentDayEndTime() {
Date now = new Date();
try {
now = longSdf.parse(shortSdf.format(now) + " 23:59:59");
} catch (Exception e) {
e.printStackTrace();
}
return now;
}

/**
* 获得本小时的开始时间，即2012-01-01 23:59:59
*
* @return
*/
public   Date getCurrentHourStartTime() {
Date now = new Date();
try {
now = longHourSdf.parse(longHourSdf.format(now));
} catch (Exception e) {
e.printStackTrace();
}
return now;
}

/**
* 获得本小时的结束时间，即2012-01-01 23:59:59
*
* @return
*/
public   Date getCurrentHourEndTime() {
Date now = new Date();
try {
now = longSdf.parse(longHourSdf.format(now) + ":59:59");
} catch (Exception e) {
e.printStackTrace();
}
return now;
}

/**
* 获得本月的开始时间，即2012-01-01 00:00:00
*
* @return
*/
public   Date getCurrentMonthStartTime() {
Calendar c = Calendar.getInstance();
Date now = null;
try {
c.set(Calendar.DATE, 1);
now = shortSdf.parse(shortSdf.format(c.getTime()));
} catch (Exception e) {
e.printStackTrace();
}
return now;
}

/**
* 当前月的结束时间，即2012-01-31 23:59:59
*
* @return
*/
public   Date getCurrentMonthEndTime() {
Calendar c = Calendar.getInstance();
Date now = null;
try {
c.set(Calendar.DATE, 1);
c.add(Calendar.MONTH, 1);
c.add(Calendar.DATE, -1);
now = longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59");
} catch (Exception e) {
e.printStackTrace();
}
return now;
}

/**
* 当前年的开始时间，即2012-01-01 00:00:00
*
* @return
*/
public   Date getCurrentYearStartTime() {
Calendar c = Calendar.getInstance();
Date now = null;
try {
c.set(Calendar.MONTH, 0);
c.set(Calendar.DATE, 1);
now = shortSdf.parse(shortSdf.format(c.getTime()));
} catch (Exception e) {
e.printStackTrace();
}
return now;
}

/**
* 当前年的结束时间，即2012-12-31 23:59:59
*
* @return
*/
public   Date getCurrentYearEndTime() {
Calendar c = Calendar.getInstance();
Date now = null;
try {
c.set(Calendar.MONTH, 11);
c.set(Calendar.DATE, 31);
now = longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59");
} catch (Exception e) {
e.printStackTrace();
}
return now;
}

/**
* 当前季度的开始时间，即2012-01-1 00:00:00
*
* @return
*/
public   Date getCurrentQuarterStartTime() {
Calendar c = Calendar.getInstance();
int currentMonth = c.get(Calendar.MONTH) + 1;
Date now = null;
try {
if (currentMonth >= 1 && currentMonth <= 3)
c.set(Calendar.MONTH, 0);
else if (currentMonth >= 4 && currentMonth <= 6)
c.set(Calendar.MONTH, 3);
else if (currentMonth >= 7 && currentMonth <= 9)
c.set(Calendar.MONTH, 4);
else if (currentMonth >= 10 && currentMonth <= 12)
c.set(Calendar.MONTH, 9);
c.set(Calendar.DATE, 1);
now = longSdf.parse(shortSdf.format(c.getTime()) + " 00:00:00");
} catch (Exception e) {
e.printStackTrace();
}
return now;
}

/**
* 当前季度的结束时间，即2012-03-31 23:59:59
*
* @return
*/
public   Date getCurrentQuarterEndTime() {
Calendar c = Calendar.getInstance();
int currentMonth = c.get(Calendar.MONTH) + 1;
Date now = null;
try {
if (currentMonth >= 1 && currentMonth <= 3) {
c.set(Calendar.MONTH, 2);
c.set(Calendar.DATE, 31);
} else if (currentMonth >= 4 && currentMonth <= 6) {
c.set(Calendar.MONTH, 5);
c.set(Calendar.DATE, 30);
} else if (currentMonth >= 7 && currentMonth <= 9) {
c.set(Calendar.MONTH, 8);
c.set(Calendar.DATE, 30);
} else if (currentMonth >= 10 && currentMonth <= 12) {
c.set(Calendar.MONTH, 11);
c.set(Calendar.DATE, 31);
}
now = longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59");
} catch (Exception e) {
e.printStackTrace();
}
return now;
}
/**
* 获取前/后半年的开始时间
* @return
*/
public   Date getHalfYearStartTime(){
Calendar c = Calendar.getInstance();
int currentMonth = c.get(Calendar.MONTH) + 1;
Date now = null;
try {
if (currentMonth >= 1 && currentMonth <= 6){
c.set(Calendar.MONTH, 0);
}else if (currentMonth >= 7 && currentMonth <= 12){
c.set(Calendar.MONTH, 6);
}
c.set(Calendar.DATE, 1);
now = longSdf.parse(shortSdf.format(c.getTime()) + " 00:00:00");
} catch (Exception e) {
e.printStackTrace();
}
return now;

}
/**
* 获取前/后半年的结束时间
* @return
*/
public   Date getHalfYearEndTime(){
Calendar c = Calendar.getInstance();
int currentMonth = c.get(Calendar.MONTH) + 1;
Date now = null;
try {
if (currentMonth >= 1 && currentMonth <= 6){
c.set(Calendar.MONTH, 5);
c.set(Calendar.DATE, 30);
}else if (currentMonth >= 7 && currentMonth <= 12){
c.set(Calendar.MONTH, 11);
c.set(Calendar.DATE, 31);
}
now = longSdf.parse(shortSdf.format(c.getTime()) + " 23:59:59");
} catch (Exception e) {
e.printStackTrace();
}
return now;
}

}

/**
* 获取前一天日期 及星期
*/
public class RemindDateUtils {
private void initDate(){
String[] weekDays = {"周日","周一","周二","周三","周四","周五","周六"};
Calendar cal = Calendar.getInstance();
cal.add(Calendar.Date,-1);
int i = cal.get(Calendar.DAY_OF_WEEK)-1;
if(i<0){
i=0;
}
String yesterday = new SimpleDateFormate("yyyy年MM月dd日").format(cal.getTime());
　　　　 String w = weekDays[i];
}

}