Java實(shí)現(xiàn)的日期處理類(lèi)完整實(shí)例

更新時(shí)間：2017年09月18日 11:48:14 作者：夏日娃

這篇文章主要介紹了Java實(shí)現(xiàn)的日期處理類(lèi),結(jié)合完整實(shí)例形式分析了Java針對(duì)日期的獲取、運(yùn)算、轉(zhuǎn)換等相關(guān)操作技巧,需要的朋友可以參考下

本文實(shí)例講述了Java實(shí)現(xiàn)的日期處理類(lèi)。分享給大家供大家參考，具體如下：

開(kāi)發(fā)中常常要使用日期，先小結(jié)如下，以備后用。

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 獲取當(dāng)天時(shí)間(20161109)
  * @return
   */
  public static String getCurrentDay(){
    return sdf.format(new Date());
  }
  /**
   *
  * @Title: fTime2
  * @Description: TODO 獲取time這個(gè)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天數(shù)據(jù)
      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 獲取time這個(gè)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天數(shù)據(jù)
      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 獲取昨天的日期
  * @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 獲取最近一個(gè)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 獲取本月第一天
  * @return
   */
  public static String getCurrentMonthFirstDay(){
    Calendar  cal_1=Calendar.getInstance();//獲取當(dāng)前日期
    cal_1.add(Calendar.MONTH, 0);
    cal_1.set(Calendar.DAY_OF_MONTH,1);//設(shè)置為1號(hào),當(dāng)前日期既為本月第一天
    String firstDay = sdf.format(cal_1.getTime());
    return firstDay;
  }
  /**
   *
  * @Title: getMonthFirstDay
  * @Description: TODO 獲取上月第一天
  * @return
   */
  public static String getPreviousMonthFirstDay(){
   //獲取當(dāng)前月第一天：
  Calendar c = Calendar.getInstance();
  c.add(Calendar.MONTH, -1);
  c.set(Calendar.DAY_OF_MONTH,1);//設(shè)置為1號(hào),當(dāng)前日期既為本月第一天
  String first = sdf.format(c.getTime());
  return first;
  }
  /**
   *
  * @Title: getMonthFirstDay
  * @Description: TODO 獲取上月最后一天
  * @return
   */
  public static String getPreviousMonthLastDay(){
  //獲取當(dāng)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 獲取指定時(shí)間最后一天
  * @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();
  }
  //獲取當(dāng)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 獲取本周周一
   */
  public static String getCurrentMonday(){
     Calendar cal = Calendar.getInstance();
     cal.setFirstDayOfWeek(Calendar.MONDAY);//將每周第一天設(shè)為星期一，默認(rèn)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 獲取上周周日
   */
  public static String getPreviousSunday(){
     Calendar cal = Calendar.getInstance();
     cal.setFirstDayOfWeek(Calendar.MONDAY);//將每周第一天設(shè)為星期一，默認(rèn)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 將日期轉(zhuǎn)換為毫秒數(shù)
  * @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 將日期轉(zhuǎn)換為毫秒數(shù)
  * @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;
  }
  /**
   * 計(jì)算日期相差天數(shù)
   * @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 轉(zhuǎn)日期(年-月-日 時(shí)-分-秒)
  * @param timestamp
  * @return
   */
  public static String longToDate(Long msecond){
    Date date = new Date(msecond);
    return sdfymdhms.format(date);
  }
}

PS：這里再為大家推薦幾款關(guān)于日期與天數(shù)計(jì)算的在線工具供大家使用：

在線日期/天數(shù)計(jì)算器：
http://tools.jb51.net/jisuanqi/date_jisuanqi

在線萬(wàn)年歷日歷：
http://tools.jb51.net/bianmin/wannianli

在線陰歷/陽(yáng)歷轉(zhuǎn)換工具：
http://tools.jb51.net/bianmin/yinli2yangli

更多關(guān)于java相關(guān)內(nèi)容感興趣的讀者可查看本站專(zhuān)題：《java日期與時(shí)間操作技巧匯總》、《Java數(shù)據(jù)結(jié)構(gòu)與算法教程》、《Java操作DOM節(jié)點(diǎn)技巧總結(jié)》和《Java緩存操作技巧匯總》

希望本文所述對(duì)大家java程序設(shè)計(jì)有所幫助。

您可能感興趣的文章: