按照月份进行查询
DateFormat df=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
Calendar calendar = new GregorianCalendar(date.getYear()+1900, date.getMonth(), 1,0,0,0);
Date a=calendar.getTime();
calendar.add(Calendar.MONTH, 1);
Date b=calendar.getTime();
//system.out.println(new SimpleDateFormat("yyyy-MM-dd").format(a));
//system.out.println(new SimpleDateFormat("yyyy-MM-dd").format(b));
String sql="select a from t_table a where a.xxx=?1 and "
+ " a.tDate between '"+df.format(a)+"' and '"+df.format(b)+"'" ;
java.util.Date的getYear() 计算当前年份,需再加上1900
/**
* Returns a value that is the result of subtracting 1900 from the
* year that contains or begins with the instant in time represented
* by this Date
object, as interpreted in the local
* time zone.
*
* @return the year represented by this date, minus 1900.
* @see java.util.Calendar
* @deprecated As of JDK version 1.1,
* replaced by Calendar.get(Calendar.YEAR) - 1900
.
*/
@Deprecated
public int getYear() {
return normalize().getYear() - 1900;
}
Calendar和GregorianCalendar日历类
Calendar 类是一个抽象类,它为特定瞬间与一组诸如 YEAR、MONTH、DAY_OF_MONTH、HOUR 等 日历字段之间的转换提供了一些方法,并为操作日历字段(例如获得下星期的日期)提供了一些方法。瞬间可用毫秒值来表示,它是距历元(即格林威治标准时间 1970 年 1 月 1 日的 00:00:00.000,格里高利历)的偏移量。
GregorianCalendar 是 Calendar 的一个具体子类,提供了世界上大多数国家/地区使用的标准日历系统。
注意月份的表示,一月是0,二月是1,以此类推,12月是11。因为大多数人习惯于使用单词而不是使用数字来表示月份,这样程序也许更易读,父类Calendar使用常量来表示月份:JANUARY, FEBRUARY,等等。
注意:
----月份:一月是0,二月是1,以此类推,12月是11
----星期:周日是1,周一是2,。。。。。周六是7
Calendar http://blog.csdn.net/myjlvzlp/article/details/8065775
package util;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
*
* @author yjmao
* @deprecated Calendar的常用方法和常用属性小结
* @version V1.0.0
*/
public class LearnCalendar {
public static void main(String[] args){
//常用方法
param();
//常用属性
method();
}
//常用方法
public static void method(){
Date date = new Date();
Calendar c = Calendar.getInstance();
//setTime():使用给定的Date设置此 Calendar 的时间
c.setTime(date);
//获取Calendar对象
Calendar cm = Calendar.getInstance();
//getTime():获取当前时间,类似于new Date();
Date d = cm.getTime();
System.err.println("Calendar获得时间:" + d);
System.err.println("new Date创建的时间:" + date);
//getTimeInMillis():返回此 Calendar 的时间值,以毫秒为单位。
long dl = c.getTimeInMillis();
long ddate = cm.getTimeInMillis();
System.err.println("毫秒数:" + dl);
System.err.println("毫秒数:" + ddate);
//setTimeInMillis():用给定的 long 值设置此Calendar的当前时间值。
long sv = 123456;
Calendar sc = Calendar.getInstance();
sc.setTimeInMillis(sv);
SimpleDateFormat ss = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String st = ss.format(sc.getTime());
System.err.println(st);
//get():返回给定日历字段的值。
int year = c.get(Calendar.YEAR);
System.err.println(year);
//set():将给定的日历字段设置为给定值
c.set(Calendar.YEAR, 2);
int y = c.get(Calendar.YEAR);
System.err.println(y);//输出2
//Calendar比较:before(),after(),equals(),compareTo().
try{
String startTime = "2012-12-12 12:45:39";
String endTime = "2012-12-12 12:45:40";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date startDate = sdf.parse(startTime);
Date endDate = sdf.parse(endTime);
Calendar start = Calendar.getInstance();
Calendar end = Calendar.getInstance();
start.setTime(startDate);
end.setTime(endDate);
if(start.before(end)){
System.err.println("开始时间小于结束时间");
}else if(start.after(end)){
System.err.println("开始时间大于结束时间");
}else if(start.equals(end)){
System.err.println("开始时间等于结束时间");
}
/*
* start < end 返回-1
* start = end 返回0
* start > end 返回1
*/
int count = start.compareTo(end);
System.err.println(count);
//add():为给定的日历字段添加或减去指定的时间量
start.add(Calendar.YEAR, -3);
System.err.println("原来的时间:" + startTime);
System.err.println("add后的时间:" + sdf.format(start.getTime()));
//toString():转换为字符串
System.err.println(start.toString());
}catch(Exception e){}
}
//常用属性
public static void param(){
Date date = new Date();
Calendar c = Calendar.getInstance();
c.setTime(date);
//Calendar.YEAR:日期中的年
int year = c.get(Calendar.YEAR);
//Calendar.MONTH:日期中的月,需要加1
int mounth = c.get(Calendar.MONTH) + 1;
//Calendar.DATE:日期中的日
int day = c.get(Calendar.DATE);
//Calendar.HOUR:日期中的小时(12小时制)
int hour = c.get(Calendar.HOUR);
//Calendar.HOUR_OF_DAY:24小时制
int HOUR_OF_DAY = c.get(Calendar.HOUR_OF_DAY);
//Calendar.MINUTE:日期中的分钟
int minute = c.get(Calendar.MINUTE);
//Calendar.SECOND:日期中的秒
int second = c.get(Calendar.SECOND);
System.err.println(year + "-" + mounth + "-" + day + " " + hour + ":" + minute + ":" + second);
//Calendar.WEEK_OF_YEAR:当前年中星期数
int WEEK_OF_YEAR = c.get(Calendar.WEEK_OF_YEAR);
//Calendar.WEEK_OF_MONTH:当前月中星期数
int WEEK_OF_MONTH = c.get(Calendar.WEEK_OF_MONTH);
//Calendar.DAY_OF_YEAR:当前年中的第几天
int DAY_OF_YEAR = c.get(Calendar.DAY_OF_YEAR);
//Calendar.DAY_OF_MONTH:当前月中的第几天
int DAY_OF_MONTH = c.get(Calendar.DAY_OF_MONTH);
//Calendar.DAY_OF_WEEK:当前星期的第几天(星期天表示第一天,星期六表示第七天)
int DAY_OF_WEEK = c.get(Calendar.DAY_OF_WEEK);
//Calendar.DAY_OF_WEEK_IN_MONTH:当前月中的第几个星期
int DAY_OF_WEEK_IN_MONTH = c.get(Calendar.DAY_OF_WEEK_IN_MONTH);
try{
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date ampm = format.parse("2012-12-15 21:59:59");
Calendar cc = Calendar.getInstance();
cc.setTime(ampm);
//AM_PM:HOUR 是在中午之前还是在中午之后,在中午12点之前返回0,在中午12点(包括12点)之后返回1
int AM_PM = cc.get(Calendar.AM_PM);
}catch(Exception e){}
}
GregorianCalendar http://blog.csdn.net/qq_21122243/article/details/73294199
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class TestCalendar {
public static void main(String[] args) {
Calendar calendar = new GregorianCalendar(2015, 11, 9, 11, 9, 50);
Calendar calendar2 = new GregorianCalendar();
// 设定日期
calendar2.set(Calendar.YEAR, 2015);
calendar2.set(Calendar.MONTH, 11);
calendar2.set(Calendar.DATE, 9);
calendar2.set(Calendar.HOUR_OF_DAY, 11);
calendar2.set(calendar.MINUTE, 45);
calendar2.set(calendar.SECOND, 34);
// 得到相关的日期元素。
int year = calendar2.get(Calendar.YEAR);
int month = calendar2.get(Calendar.MONTH);
int Date = calendar2.get(Calendar.DATE);
// 日:Calendar.Date和Calendar.DAY_OF_MONTH同义。
int hour = calendar2.get(Calendar.HOUR);
int Minute = calendar2.get(Calendar.MINUTE);
int ss = calendar2.get(Calendar.SECOND);
int week = calendar2.get(Calendar.DAY_OF_WEEK);
// 星期几 这里:1-7.周日是1,周一是2,,,,,周六是7
System.out.printf("%d年%d月%d日,星期%d\n", year, month, Date, week);
// 日期计算
GregorianCalendar calendar3 = new GregorianCalendar(2015, 11, 9, 14, 55, 50);
;
calendar3.add(Calendar.MONTH, -7);// 月份减7
calendar3.add(Calendar.DATE, 7);// 增加7天
printCalendar(calendar3);
// 日历对象和时间对象转化。
Date d = calendar3.getTime();
long millSecond = calendar3.getTimeInMillis();
Date date2 = new Date();
GregorianCalendar calendar4 = new GregorianCalendar();
calendar4.setTime(date2);
long g = System.currentTimeMillis();
printCalendar(calendar4);
}
public static void printCalendar(Calendar calendar) {
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH) + 1;
int day = calendar.get(Calendar.DAY_OF_MONTH);
int day2 = calendar.get(Calendar.DATE);
// 日:Calendar.Date和Calendar.DAY_OF_MONTH
int date = calendar.get(Calendar.DAY_OF_WEEK) - 1;// 星期几
String week = "" + ((date == 0) ? "日" : date);
System.out.printf("%d年%d月%d日,星期%s\n", year, month, day, week);
}
}