封装一些常用操作，获取时间等。不然每次转一下也挺麻烦
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class DateUtil {
/**
* 返回日期：yyyyMMddHHmmss格式的字符串
*/
public static String getStrOfDate() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddHHmmss");
String dateString = formatter.format(currentTime);
return dateString;
}
/**
* 获取当前日期时间 返回日期：yyyy-MM-dd HH:mm:ss
*
* @author WikerYong
* @version 2012-1-9 上午09:47:39
* @return
*/
public static String getStrOfDateTime() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateString = formatter.format(currentTime);
return dateString;
}
/**
* 字符串转为日期类型，返回yyyy-MM-dd HH:mm:ss格式
*
* @author WikerYong Email:<a href="#">yw_312@foxmail.com</a>
* @version 2012-7-5 下午04:33:49
* @param str
* @return
*/
public static Date getDateByStr(String str) {
Date date = new Date();
try {
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
date = formatter.parse(str);
} catch (ParseException e) {
e.printStackTrace();
}
return date;
}
/**
* 获取当前日期时间 返回日期：yyyy-MM-dd HH:mm
*
* @author WikerYong Email:<a href="#">yw_312@foxmail.com</a>
* @version 2012-1-31 下午02:57:30
* @return
*/
public static String getStrOfDateMinute() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm");
String dateString = formatter.format(currentTime);
return dateString;
}
/**
* 返回日期：yyyyMMddHHmmssSSS格式的字符串
*
* @author WikerYong
* @version 2011-11-25 下午07:18:44
* @return
*/
public static String getStrOfMs() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddHHmmssSSS");
String dateString = formatter.format(currentTime);
return dateString;
}
/**
* 返回日期：yyyyMM格式的字符串
*/
public static String getMonthFolder() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyyMM");
String dateString = formatter.format(currentTime);
return dateString;
}
/**
* 返回日期：yyyyMM格式的字符串
*/
public static String getDateFolder() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd");
String dateString = formatter.format(currentTime);
return dateString;
}
/**
* 获取当前月份
*
* @author WikerYong Email:<a href="#">yw_312@foxmail.com</a>
* @version 2012-4-9 上午10:45:28
* @return
*/
public static String getMonth() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("MM");
String dateString = formatter.format(currentTime);
return dateString;
}
/**
* 获取当前年份
*
* @author WikerYong Email:<a href="#">yw_312@foxmail.com</a>
* @version 2012-7-5 下午04:31:07
* @return
*/
public static String getYear() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy");
String dateString = formatter.format(currentTime);
return dateString;
}
/**
* 返回日期：yyyyMMddHH格式的字符串
*
* @author WikerYong
* @version 2011-12-20 下午03:43:14
* @return
*/
public static String getDataOfHour() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddHH");
String dateString = formatter.format(currentTime);
return dateString;
}
/**
* 返回时间：yyyyMMddHHmm格式
*/
public static String getStrOfTime() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddHHmm");
String dateString = formatter.format(currentTime);
return dateString;
}
/**
* 返回时间：yyyy-MM-dd格式
*/
public static String getCurrentDay() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
String dateString = formatter.format(currentTime);
return dateString;
}
public static String getLastDay(int day) {
java.util.Date yestoday = new java.util.Date(new java.util.Date().getTime() - 1000 * 60
* 60 * 24 * day);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdf.format(yestoday);
}
/**
* 获取昨天、前天的日期
*
* @param currentDate
* @return
*/
public static String[] getLastDates(String currentDate) {
String currYear, currMonth, currDay;
currYear = currentDate.substring(0, 4);
currMonth = currentDate.substring(4, 6);
currDay = currentDate.substring(6);
// 月份或日期首位是0
String tempMonth, tempDay;
if (currMonth.substring(0, 1).equals("0")) {
tempMonth = "0";
} else {
tempMonth = "";
}
if (currDay.substring(0, 1).equals("0") || currDay.equals("10")) {
tempDay = "0";
} else {
tempDay = "";
}
String returnDays[] = new String[2];
if (currMonth.equals("01") && currDay.equals("01")) {
returnDays[0] = (Integer.parseInt(currYear) - 1) + "1231";
returnDays[1] = (Integer.parseInt(currYear) - 1) + "1230";
} else if (currMonth.equals("01") && currDay.equals("02")) {
returnDays[0] = currYear + "0101";
returnDays[1] = (Integer.parseInt(currYear) - 1) + "1231";
} else if (Integer.parseInt(currMonth) >= 1 && Integer.parseInt(currDay) > 2) {
returnDays[0] = currYear + currMonth + tempDay + (Integer.parseInt(currDay) - 1);
if (currDay.equals("11")) {
returnDays[1] = currYear + currMonth + "0" + (Integer.parseInt(currDay) - 2);
} else {
returnDays[1] = currYear + currMonth + tempDay + (Integer.parseInt(currDay) - 2);
}
} else if (Integer.parseInt(currMonth) > 1 && Integer.parseInt(currDay) == 2) {
returnDays[0] = currYear + currMonth + "01";
if (currMonth.equals("10")) {
returnDays[1] = currYear
+ "0"
+ (Integer.parseInt(currMonth) - 1)
+ (getLastDayOfUpMonth(Integer.parseInt(currYear),
Integer.parseInt(currMonth), Integer.parseInt(currDay)));
} else {
returnDays[1] = currYear
+ tempMonth
+ (Integer.parseInt(currMonth) - 1)
+ (getLastDayOfUpMonth(Integer.parseInt(currYear),
Integer.parseInt(currMonth), Integer.parseInt(currDay)));
}
} else if (Integer.parseInt(currMonth) > 1 && Integer.parseInt(currDay) == 1) {
if (currMonth.equals("10")) {
returnDays[0] = currYear
+ "0"
+ (Integer.parseInt(currMonth) - 1)
+ (getLastDayOfUpMonth(Integer.parseInt(currYear),
Integer.parseInt(currMonth), Integer.parseInt(currDay)));
returnDays[1] = currYear
+ "0"
+ (Integer.parseInt(currMonth) - 1)
+ (getLastDayOfUpMonth(Integer.parseInt(currYear),
Integer.parseInt(currMonth), Integer.parseInt(currDay)) - 1);
} else {
returnDays[0] = currYear
+ tempMonth
+ (Integer.parseInt(currMonth) - 1)
+ (getLastDayOfUpMonth(Integer.parseInt(currYear),
Integer.parseInt(currMonth), Integer.parseInt(currDay)));
returnDays[1] = currYear
+ tempMonth
+ (Integer.parseInt(currMonth) - 1)
+ (getLastDayOfUpMonth(Integer.parseInt(currYear),
Integer.parseInt(currMonth), Integer.parseInt(currDay)) - 1);
}
} else {
returnDays[0] = currYear + currMonth + tempDay + (Integer.parseInt(currDay) - 1);
returnDays[1] = currYear + currMonth + tempDay + (Integer.parseInt(currDay) - 2);
}
return returnDays;
}
public static int getLastDayOfUpMonth(int year, int month, int date) {
Calendar calendar = new GregorianCalendar(year, month, date);
calendar.set(Calendar.DAY_OF_MONTH, 1);// 设置为1号,当前日期既为本月第一天
calendar.add(Calendar.MONTH, -1);// 月增减1天
calendar.add(Calendar.DAY_OF_MONTH, -1);// 日期倒数一日,既得到本月最后一天
return calendar.get(Calendar.DATE);
}
/**
* 获取当月第一天
*
* @author WikerYong
* @version 2011-11-21 下午04:45:06
* @return
*/
public static String getFirstDayOfMonth() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.set(Calendar.DATE, 1);// 设为当前月的1号
str = sdf.format(lastDate.getTime());
return str;
}
/**
* 获取当月最后一天
*
* @author WikerYong
* @version 2011-11-21 下午04:46:06
* @return
*/
public static String getLastDayOfMonteh() {
String str = "";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.set(Calendar.DATE, 1);// 设为当前月的1号
lastDate.add(Calendar.MONTH, 1);// 加一个月，变为下月的1号
lastDate.add(Calendar.DATE, -1);// 减去一天，变为当月最后一天
str = sdf.format(lastDate.getTime());
return str;
}
/**
* 获取去年的年份
*
* @return
*/
public static String getLastYear() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy");
Calendar c = Calendar.getInstance();
c.setTime(currentTime);
c.add(Calendar.YEAR, -1);
String dateString = formatter.format(c.getTime());
return dateString;
}
/**
* 获取前年的年份
*
* @return
*/
public static String getBeforeLastYear() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy");
Calendar c = Calendar.getInstance();
c.setTime(currentTime);
c.add(Calendar.YEAR, -2);
String dateString = formatter.format(c.getTime());
return dateString;
}
/**
* 获取某月最后一天
*
* @param year
* @param month
* @return
*/
public static String getLastDayOfMonth(int year, int month) {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, year);
cal.set(Calendar.MONTH, month-1);
cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DATE));
return new SimpleDateFormat("yyyy-MM-dd").format(cal.getTime());
}
/**
* 获取某月第一天
*
* @param year
* @param month
* @return
*/
public static String getFirstDayOfMonth(int year, int month) {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, year);
cal.set(Calendar.MONTH, month-1);
cal.set(Calendar.DAY_OF_MONTH, cal.getMinimum(Calendar.DATE));
return new SimpleDateFormat("yyyy-MM-dd").format(cal.getTime());
}
/**
* 判断日期是否为同一天
*
* @param dateA
* @param dateB
* @return true 则为同一天，false则为不在同一天
*/
public static boolean isSameDay(Date dateA,Date dateB) {
Calendar calDateA = Calendar.getInstance();
calDateA.setTime(dateA);
Calendar calDateB = Calendar.getInstance();
calDateB.setTime(dateB);
return calDateA.get(Calendar.YEAR) == calDateB.get(Calendar.YEAR)
&& calDateA.get(Calendar.MONTH) == calDateB.get(Calendar.MONTH)
&& calDateA.get(Calendar.DAY_OF_MONTH) == calDateB.get(Calendar.DAY_OF_MONTH);
}
public static void main(String[] args) {
System.out.println(getFirstDayOfMonth(2013,2));
System.out.println(getLastDayOfMonth(2013,2));
}
}