java中常用的处理时间方法

java中常用的处理时间方法


package com.sinovatech.infoplat.util;

import java.sql.Timestamp;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

import java.util.GregorianCalendar;

/**

* 时间工具类 <strong>时间格式化</strong><br/>

*

* @author 樊海潮

* @date 2009-08-19

*/

public class DateUtil {

/**

* 日期格式常量 yyyy-MM-dd

*/

public static final String DATE_FORMAT = "yyyy-MM-dd";

/**

* 时间格式常量 yyyy-MM-dd HH:mm:ss

*/

public static final String TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";

/**

* 按照指定的时间格式将传入的时间转换成字符串

*

* @param inputDate

* 时间

* @param inputFormat

* 格式化参数

* @return

*/

public static String dateToString(Date inputDate, String inputFormat) {

SimpleDateFormat sdf = new SimpleDateFormat(inputFormat);

return sdf.format(inputDate);

}

/**

* 按照指定的格式将传入的字符串转换成时间

*

* @param inputStr

* 想要转换成时间的字符串

* @param inputFormat

* 时间格式化 年：y 月：M 日：d 时：H 分：m 秒：s

* @return

*/

public static Date stringToDate(String inputStr, String inputFormat) {

SimpleDateFormat sdf = new SimpleDateFormat(inputFormat);

Date date = null;

try {

date = sdf.parse(inputStr);

} catch (ParseException e) {

e.printStackTrace();

}

return date;

}

/**

* 获取当前月的最后一天，并格式化为yyyyMMdd000000 用于次月失效的业务

*

* @return

*/

public static String getLastDayOfMonth() {

SimpleDateFormat df = new SimpleDateFormat("yyyyMMdd");

GregorianCalendar cal = new GregorianCalendar();

Calendar cl = Calendar.getInstance();

int days = cal.getActualMaximum(Calendar.DAY_OF_MONTH);

cl.set(Calendar.DAY_OF_MONTH, days);

String timeno = df.format(cl.getTime()) + "000000";

return timeno;

}

/**

* 把当前时间按照指定的格式格式化并返回

*

* @param inputFormat

* 时间格式

* @return

*/

public static String getCurrentTime(String inputFormat) {

SimpleDateFormat sdf = new SimpleDateFormat(inputFormat);

return sdf.format(new Date());

}

/**

* 获得星期的名字

*

* @param weekNo

* @return

*/

public static String getWeekName(int weekNo) {

String[] weekNames = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };

String weekName = weekNames[(weekNo - 1)];

return weekName;

}

/**

* 比较时间

*

* @param beginDate

* @param toDate

* @return

*/

public static boolean compareDate(Date beginDate, Date toDate) {

return (beginDate.before(toDate));

}

/**

*

* @param beforeArg

* 开始时间

* @param afterArg

* 结束时间

* @param formatRegex

* 时间格式化类型 yyyyMMddHHmmss/yyyyMMdd/HHmmss/mmss/等

* @return

*/

public static String compareTo(String beforeArg, String afterArg,

String formatRegex) {

String result = "";

SimpleDateFormat format = new SimpleDateFormat(formatRegex);

Date after = null;

Date before = null;

try {

after = format.parse(afterArg);

before = format.parse(beforeArg);

} catch (ParseException e) {

e.printStackTrace();

}

if (after == null || before == null) {

throw new NullPointerException();

}

long tmp = after.getTime() - before.getTime();

System.out.println("tmp == " + tmp);

result = String.valueOf((tmp / 1000 / 60 / 60) + "时" + tmp / 1000 / 60

% 60 + "分" + tmp / 1000 % 60 + "秒");

return result;

}

public static java.util.Date getTimestamp(String arg) {

Date d = null;

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");

try {

if (arg != null && arg.replaceAll("\\s", "").length() > 0) {

d = sdf.parse(arg);

System.out.println(d);

}

} catch (ParseException e) {

e.printStackTrace();

}

return d;

}

public static java.sql.Date getTimes(String arg) {

java.sql.Date sd = null;

java.util.Date d = null;

if (arg != null) {

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

try {

d = sdf.parse(arg);

sd = new java.sql.Date(d.getTime());

} catch (ParseException e) {

e.printStackTrace();

}

} else {

sd = new java.sql.Date(System.currentTimeMillis());

}

return sd;

}

/**

* 获取前一天的日期

*

* @param m

* @return

*/

public static String getChangeDate(Date date, int m) {

SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd");

String nowdate = sdf1.format(date);

Timestamp time = Timestamp.valueOf(nowdate);

long l = time.getTime() + 24 * 60 * 60 * m * 1000;

time.setTime(l);

String changeDate = sdf2.format(time);

return changeDate;

}

public static void main(String[] args) {

boolean bool = false;

Date date = new Date();

SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");

String s = format.format(date);

String s1 = s.substring(0, 8) + "000000";

String s2 = s.substring(0, 8) + "080000";

Date date1 = null;

Date date2 = null;

try {

date1 = format.parse(s1);

date2 = format.parse(s2);

} catch (Exception e) {

e.printStackTrace();

}

if (date.after(date1) && date.before(date2)) {

bool = true;

} else {

bool = false;

}

// System.out.println(dateToString(new Date(), "yyyy-MM-dd HH:mm:ss"));

// System.out.println(new Date() + ":" + new Date());

System.out.println(compareDate(new Date(), new Date()));

}

}