Java实现的日期处理类完整实例

Java实现的日期处理类完整实例

本文实例讲述了java实现的日期处理类。分享给大家供大家参考，具体如下：

开发中常常要使用日期，先小结如下，以备后用。

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

public class FormatTime {

private final static SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");

private final static SimpleDateFormat sdfymdhm = new SimpleDateFormat("yyyyMMddHHmmss");

private final static SimpleDateFormat sdfymdhms = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

/**

*

* @Title: getCurrentDay

* @Description: TODO 获取当天时间(20161109)

* @return

*/

public static String getCurrentDay(){

return sdf.format(new Date());

}

/**

*

* @Title: fTime2

* @Description: TODO 获取time这个日期以前dayAgo天的日期

* @return

*/

public static String fTime(String time,int dayAgo){

Date date = null;

try {

date = sdf.parse(time);

} catch (ParseException e) {

throw new RuntimeException(e);

}

Calendar calendar = Calendar.getInstance();

calendar.setTime(date);

if(dayAgo>0){

calendar.add(Calendar.DAY_OF_MONTH, -dayAgo);//前15天数据

date = calendar.getTime();

calendar.setTime(date);

}

int year=calendar.get(Calendar.YEAR);

int month=calendar.get(Calendar.MONTH) + 1;

int day = calendar.get(Calendar.DAY_OF_MONTH);

String mon="";

String d="";

if(month<10){

mon="0"+month;

}else{

mon=month+"";

}

if(day<10){

d="0"+day;

}else{

d=""+day;

}

String ret=year+""+mon+""+d;

return ret;

}

/**

*

* @Title: fTime2

* @Description: TODO 获取time这个日期以后dayAfter天的日期

* @return

*/

public static String fTime2(String time,int dayAfter){

Date date = null;

try {

date = sdf.parse(time);

} catch (ParseException e) {

throw new RuntimeException(e);

}

Calendar calendar = Calendar.getInstance();

calendar.setTime(date);

if(dayAfter>0){

calendar.add(Calendar.DAY_OF_MONTH, +dayAfter);//后15天数据

date = calendar.getTime();

calendar.setTime(date);

}

int year=calendar.get(Calendar.YEAR);

int month=calendar.get(Calendar.MONTH) + 1;

int day = calendar.get(Calendar.DAY_OF_MONTH);

String mon="";

String d="";

if(month<10){http://

mon="0"+month;

}else{

mon=month+"";

}

if(day<10){

d="0"+day;

}else{

d=""+day;

}

String ret=year+""+mon+""+d;

return ret;

}

/**

*

* @Title: getDefaultTime

* @Description: TODO 获取昨天的日期

* @return

*/

public static String getDefaultTime(){

Calendar calendar = Calendar.getInstance();

calendar.add(Calendar.DAY_OF_MONTH, -1);//前1天

Date date = calendar.getTime();

String time=sdf.format(date);

return time;

}

/**

*

* @Title: getSunday

* @Description: TODO 获取最近一个星期天

* @return

*/

public static String getSunday(){

SimpleDateFormat f = new SimpleDateFormat("yyyyMMdd");

Calendar c = Calendar.getInstance();

c.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);

return f.format(c.getTime());

}

/**

*

* @Title: getMonthFirstDay

* @Description: TODO 获取本月第一天

* @return

*/

public static String getCurrentMonthFirstDay(){

Calendar cal_1=Calendar.getInstance();//获取当前日期

cal_1.add(Calendar.MONTH, 0);

cal_1.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天

String firstDay = sdf.format(cal_1.getTime());

return firstDay;

}

/**

*

* @Title: getMonthFirstDay

* @Description: TODO 获取上月第一天

* @return

*/

public static String getPreviousMonthFirstDay(){

//获取当前月第一天：

Calendar c = Calendar.getInstance();

c.add(Calendar.MONTH, -1);

c.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天

String first = sdf.format(c.getTime());

return first;

}

/**

*

* @Title: getMonthFirstDay

* @Description: TODO 获取上月最后一天

* @return

*/

public static String getPreviousMonthLastDay(){

//获取当前月最后一天

Calendar ca = Calendar.getInstance();

ca.set(Calendar.DAY_OF_MONTH,0);//

String lastDay = sdf.format(ca.getTime());

return lastDay;

}

/**

*

* @Title: getCurrentMonthLastDay

* @Description: TODO 获取指定时间最后一天

* @return

*/

public static String getCurrentMonthLastDay(String time){

Date date =null;

try {

date= sdf.parse(time);

} catch (ParseException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

//获取当前月最后一天

Calendar ca = Calendar.getInstance();

ca.setTime(date);

ca.set(Calendar.DAY_OF_MONTH,

ca.getActualMaximum(Calendar.DAY_OF_MONTH)); //

String lastDay = sdf.format(ca.getTime());

return lastDay;

}

/***

*

* @Title: getCurrentWeekDay

* @Description: TODO 获取本周周一

*/

public static String getCurrentMonday(){

Calendar cal = Calendar.getInstance();

cal.setFirstDayOfWeek(Calendar.MONDAY);//将每周第一天设为星期一，默认是星期天

cal.add(Calendar.DATE, 0);

cal.set(Calendar.DAY_OF_WEEK,Calendar.MONDAY);

String monday = sdf.format(cal.getTime());

return monday;

}

/***

*

* @Title: getPreviousSunday

* @Description: TODO 获取上周周日

*/

public static String getPreviousSQvTunQwuunday(){

Calendar cal = Calendar.getInstance();

cal.setFirstDayOfWeek(Calendar.MONDAY);//将每周第一天设为星期一，默认是星期天

cal.add(Calendar.DATE, -1*7);

cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);

String sunday =sdf.format(cal.getTime());

return sunday;

}

/**

*

* @Title: getMiniSencond

* @Description: TODO 将日期转换为毫秒数

* @param str

* @return

*/

public static String getMiniSencond(String str){

long millionSeconds=0;

try {

millionSeconds = sdfymdhm.parse(str).getTime();//毫秒

} catch (ParseException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return millionSeconds+"";

}

/**

*

* @Title: getDateSencond

* @Description: TODO 将日期转换为毫秒数

* @param str

* @return

*/

public static long getDateSencond(String str){

long millionSeconds=0;

try {

millionSeconds = sdfymdhms.parse(str).getTime();//毫秒

} catch (ParseException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return millionSeconds;

}

/**

* 计算日期相差天数

* @param str1

* @param str2

* @return

*/

public static int getDistanceOfTwoDate(String str1,String str2){

int result=0;

try{

Date date1 = sdf.parse(str1);

Date date2 =sdf.parse(str2);

Calendar aCalendar = Calendar.getInstance();

aCalendar.setTime(date1);

int day1 = aCalendar.get(Calendar.DAY_OF_YEAR);

aCalendar.setTime(date2);

int day2 = aCalendar.get(Calendar.DAY_OF_YEAR);

result = day1-day2;

}catch(Exception e){

e.printStackTrace();

}

return result;

}

/**

*

* @Title: long2Date

* @Description: TODO long 转日期(年-月-日 时-分-秒)

* @param timestamp

* @return

*/

public static String longToDate(Long msecond){

Date date = new Date(msecond);

return sdfymdhms.format(date);

}

}

PS：这里再为大家推荐几款关于日期与天数计算的在线工具供大家使用：

在线日期/天数计算器：

http://tools.jb51.net/jisuanqi/date_jisuanqi

在线万年历日历：

http://tools.jb51.net/bianmin/wannianli

在线阴历/阳历转换工具：

http://tools.jb51.net/bianmin/yinli2yangli

更多关于java相关内容感兴趣的读者可查看本站专题：《java日期与时间操作技巧汇总》、《Java数据结构与算法教程》、《Java操作DOM节点技巧总结》和《Java缓存操作技巧汇总》

希望本文所述对大家java程序设计有所帮助。

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