Java实现的日期处理类完整实例
作者:夏日娃 时间:2023-12-08 00:16:10
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){
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 getPreviousSunday(){
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
希望本文所述对大家java程序设计有所帮助。
来源:http://blog.csdn.net/u011625492/article/details/72843471
标签:Java,日期
0
投稿
猜你喜欢
详解在java中进行日期时间比较的4种方法
2022-09-03 23:35:52
SpringBoot打包发布到linux上(centos 7)的步骤
2023-08-11 06:35:55
android实现圆环倒计时控件
2021-12-15 20:55:54
Activiti7整合Springboot使用记录
2022-11-11 06:17:24
C#利用ZXing.Net生成条形码和二维码
2023-11-04 00:36:02
Android activity堆栈及管理实例详解
2022-07-28 01:17:14
Java Socket编程(四) 重复和并发服务器
2022-06-29 07:07:06
Java中单例模式的7种写法
2021-09-05 23:40:57
解析Spring Mvc Long类型精度丢失问题
2021-11-06 12:27:37
java8 如何实现分组计算数量和计算总数
2022-05-05 01:17:32
Java如何基于IO流实现同一文件读写操作
2023-07-30 15:06:38
关于springboot响应式编程整合webFlux的问题
2023-12-07 07:25:55
Java实现有限状态机的推荐方案分享
2022-01-07 15:54:27
SpringBoot用@Async注解实现异步任务
2023-08-07 06:36:09
Android圆形头像拍照后“无法加载此图片”的问题解决方法(适配Android7.0)
2023-11-18 23:26:56
Go Java算法之累加数示例详解
2023-03-16 00:43:31
spring boot打包成可执行jar包
2022-09-26 12:48:14
C#实现文本文件读写方法汇总
2023-10-27 16:57:40
Android编程使用Fragment界面向下跳转并一级级返回的实现方法
2021-08-20 19:56:51
浅谈Mybatis获取参数值的方式
2022-09-22 07:56:21