Java获取各种常用时间方法

import java.text.DateFormat;    
import java.text.ParsePosition;    
import java.text.SimpleDateFormat;    
import java.util.Calendar;    
import java.util.Date;    
import java.util.GregorianCalendar;    
    
/**   
 * @author HeFeng      2008-12-1 下午08:43:57   
 * @version 1.0   
 */    
public class TimeTest {    
    //用来全局控制 上一周，本周，下一周的周数变化    
    private  int weeks = 0;    
    private int MaxDate;//一月最大天数    
    private int MaxYear;//一年最大天数    
        
        
    /**   
     * @param args   
     */    
    public static void main(String[] args) {    
        TimeTest tt = new TimeTest();    
        System.out.println("获取当天日期:"+tt.getNowTime("yyyy-MM-dd"));    
        System.out.println("获取本周一日期:"+tt.getMondayOFWeek());    
        System.out.println("获取本周日的日期~:"+tt.getCurrentWeekday());    
        System.out.println("获取上周一日期:"+tt.getPreviousWeekday());    
        System.out.println("获取上周日日期:"+tt.getPreviousWeekSunday());    
        System.out.println("获取下周一日期:"+tt.getNextMonday());    
        System.out.println("获取下周日日期:"+tt.getNextSunday());    
        System.out.println("获得相应周的周六的日期:"+tt.getNowTime("yyyy-MM-dd"));    
        System.out.println("获取本月第一天日期:"+tt.getFirstDayOfMonth());    
        System.out.println("获取本月最后一天日期:"+tt.getDefaultDay());    
        System.out.println("获取上月第一天日期:"+tt.getPreviousMonthFirst());    
        System.out.println("获取上月最后一天的日期:"+tt.getPreviousMonthEnd());    
        System.out.println("获取下月第一天日期:"+tt.getNextMonthFirst());    
        System.out.println("获取下月最后一天日期:"+tt.getNextMonthEnd());    
        System.out.println("获取本年的第一天日期:"+tt.getCurrentYearFirst());    
        System.out.println("获取本年最后一天日期:"+tt.getCurrentYearEnd());    
        System.out.println("获取去年的第一天日期:"+tt.getPreviousYearFirst());    
        System.out.println("获取去年的最后一天日期:"+tt.getPreviousYearEnd());    
        System.out.println("获取明年第一天日期:"+tt.getNextYearFirst());    
        System.out.println("获取明年最后一天日期:"+tt.getNextYearEnd());    
        System.out.println("获取本季度第一天到最后一天:"+tt.getThisSeasonTime(11));    
        System.out.println("获取两个日期之间间隔天数2008-12-1~2008-9.29:"+TimeTest.getTwoDay("2008-12-1","2008-9-29"));    
        System.out.println("根据日期获得星期几:"+TimeTest.getWeek("2008-12-1"));    
    }    
        
        
    /**   
        * 得到二个日期间的间隔天数   
        */    
    public static String getTwoDay(String sj1, String sj2) {    
        SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");    
        long day = 0;    
        try {    
         java.util.Date date = myFormatter.parse(sj1);    
         java.util.Date mydate = myFormatter.parse(sj2);    
         day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);    
        } catch (Exception e) {    
         return "";    
        }    
        return day + "";    
    }    
    
    
    /**   
        * 根据一个日期，返回是星期几的字符串   
        *    
        * @param sdate   
        * @return   
        */    
    public static String getWeek(String sdate) {    
        // 再转换为时间    
        Date date = TimeTest.strToDate(sdate);    
        Calendar c = Calendar.getInstance();    
        c.setTime(date);    
        return new SimpleDateFormat("EEEE").format(c.getTime());    
    }    
    
    /**   
        * 将短时间格式字符串转换为时间 yyyy-MM-dd    
        *    
        * @param strDate   
        * @return   
        */    
    public static Date strToDate(String strDate) {    
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");    
        ParsePosition pos = new ParsePosition(0);    
        Date strtodate = formatter.parse(strDate, pos);    
        return strtodate;    
    }    
    
    /**   
        * 两个时间之间的天数   
        *    
        * @param date1   
        * @param date2   
        * @return   
        */    
    public static long getDays(String date1, String date2) {    
        if (date1 == null || date1.equals(""))    
         return 0;    
        if (date2 == null || date2.equals(""))    
         return 0;    
        // 转换为标准时间    
        SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");    
        java.util.Date date = null;    
        java.util.Date mydate = null;    
        try {    
         date = myFormatter.parse(date1);    
         mydate = myFormatter.parse(date2);    
        } catch (Exception e) {    
        }    
        long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);    
        return day;    
    }    
    
    
    
        
    // 计算当月最后一天,返回字符串    
    public String getDefaultDay(){      
       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;      
    }    
        
    // 上月第一天    
    public String getPreviousMonthFirst(){      
       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);//减一个月，变为下月的1号    
        str=sdf.format(lastDate.getTime());    
       return str;      
    }    
        
    //获取当月第一天    
    public 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;      
    }    
        
    // 获得本周星期日的日期      
    public String getCurrentWeekday() {    
        weeks = 0;    
        int mondayPlus = this.getMondayPlus();    
        GregorianCalendar currentDate = new GregorianCalendar();    
        currentDate.add(GregorianCalendar.DATE, mondayPlus+6);    
        Date monday = currentDate.getTime();    
            
        DateFormat df = DateFormat.getDateInstance();    
        String preMonday = df.format(monday);    
        return preMonday;    
    }    
        
        
    //获取当天时间     
    public String getNowTime(String dateformat){    
        Date   now   =   new   Date();       
        SimpleDateFormat   dateFormat   =   new   SimpleDateFormat(dateformat);//可以方便地修改日期格式       
        String  hehe  = dateFormat.format(now);       
        return hehe;    
    }    
        
    // 获得当前日期与本周日相差的天数    
    private int getMondayPlus() {    
        Calendar cd = Calendar.getInstance();    
        // 获得今天是一周的第几天，星期日是第一天，星期二是第二天......    
        int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK)-1;         //因为按中国礼拜一作为第一天所以这里减1    
        System.out.println("相差天数:"+dayOfWeek);    
        if (dayOfWeek == 1) {    
            return 0;    
        } else {    
            return 1 - dayOfWeek;    
        }    
    }    
        
    //获得本周一的日期    
    public String getMondayOFWeek(){    
         weeks = 0;    
         int mondayPlus = this.getMondayPlus();    
         GregorianCalendar currentDate = new GregorianCalendar();    
         currentDate.add(GregorianCalendar.DATE, mondayPlus);    
         Date monday = currentDate.getTime();    
             
         DateFormat df = DateFormat.getDateInstance();    
         String preMonday = df.format(monday);    
         return preMonday;    
    }    
        
  //获得相应周的周六的日期    
    public String getSaturday() {    
        int mondayPlus = this.getMondayPlus();    
        GregorianCalendar currentDate = new GregorianCalendar();    
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks + 6);    
        Date monday = currentDate.getTime();    
        DateFormat df = DateFormat.getDateInstance();    
        String preMonday = df.format(monday);    
        return preMonday;    
    }    
        
 // 获得上周星期日的日期    
    public String getPreviousWeekSunday() {    
        weeks=0;    
        weeks--;    
        int mondayPlus = this.getMondayPlus();    
        GregorianCalendar currentDate = new GregorianCalendar();    
        currentDate.add(GregorianCalendar.DATE, mondayPlus+weeks);    
        Date monday = currentDate.getTime();    
        DateFormat df = DateFormat.getDateInstance();    
        String preMonday = df.format(monday);    
        return preMonday;    
    }    
    
 // 获得上周星期一的日期    
    public String getPreviousWeekday() {    
        weeks--;    
        int mondayPlus = this.getMondayPlus();    
        GregorianCalendar currentDate = new GregorianCalendar();    
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks);    
        Date monday = currentDate.getTime();    
        DateFormat df = DateFormat.getDateInstance();    
        String preMonday = df.format(monday);    
        return preMonday;    
    }    
        
    // 获得下周星期一的日期    
    public String getNextMonday() {    
        weeks++;    
        int mondayPlus = this.getMondayPlus();    
        GregorianCalendar currentDate = new GregorianCalendar();    
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7);    
        Date monday = currentDate.getTime();    
        DateFormat df = DateFormat.getDateInstance();    
        String preMonday = df.format(monday);    
        return preMonday;    
    }    
        
 // 获得下周星期日的日期    
    public String getNextSunday() {    
            
        int mondayPlus = this.getMondayPlus();    
        GregorianCalendar currentDate = new GregorianCalendar();    
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7+6);    
        Date monday = currentDate.getTime();    
        DateFormat df = DateFormat.getDateInstance();    
        String preMonday = df.format(monday);    
        return preMonday;    
    }    
        
        
        
    private int getMonthPlus(){    
        Calendar cd = Calendar.getInstance();    
        int monthOfNumber = cd.get(Calendar.DAY_OF_MONTH);    
        cd.set(Calendar.DATE, 1);//把日期设置为当月第一天     
        cd.roll(Calendar.DATE, -1);//日期回滚一天，也就是最后一天     
        MaxDate=cd.get(Calendar.DATE);     
        if(monthOfNumber == 1){    
            return -MaxDate;    
        }else{    
            return 1-monthOfNumber;    
        }    
    }    
        
  //获得上月最后一天的日期    
    public String getPreviousMonthEnd(){    
        String str = "";    
       SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");        
    
       Calendar lastDate = Calendar.getInstance();    
      lastDate.add(Calendar.MONTH,-1);//减一个月    
      lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天     
      lastDate.roll(Calendar.DATE, -1);//日期回滚一天，也就是本月最后一天     
       str=sdf.format(lastDate.getTime());    
       return str;      
    }    
        
  //获得下个月第一天的日期    
    public String getNextMonthFirst(){    
        String str = "";    
       SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");        
    
       Calendar lastDate = Calendar.getInstance();    
      lastDate.add(Calendar.MONTH,1);//减一个月    
      lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天     
       str=sdf.format(lastDate.getTime());    
       return str;      
    }    
        
  //获得下个月最后一天的日期    
    public String getNextMonthEnd(){    
        String str = "";    
       SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");        
    
       Calendar lastDate = Calendar.getInstance();    
      lastDate.add(Calendar.MONTH,1);//加一个月    
      lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天     
      lastDate.roll(Calendar.DATE, -1);//日期回滚一天，也就是本月最后一天     
       str=sdf.format(lastDate.getTime());    
       return str;      
    }    
        
    //获得明年最后一天的日期    
    public String getNextYearEnd(){    
        String str = "";    
       SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");        
    
      Calendar lastDate = Calendar.getInstance();    
      lastDate.add(Calendar.YEAR,1);//加一个月    
     lastDate.set(Calendar.DATE,1);//把日期设置为当月第一天     
      lastDate.roll(Calendar.DATE, -1);//日期回滚一天，也就是本月最后一天     
       str=sdf.format(lastDate.getTime());    
       return str;      
    }    
        
  //获得明年第一天的日期    
    public String getNextYearFirst(){    
        String str = "";    
       SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");        
    
       Calendar lastDate = Calendar.getInstance();    
      lastDate.add(Calendar.YEAR,1);//加一年    
      lastDate.set(Calendar.MONTH,1);//把日期设置为当年第一月     
     lastDate.set(Calendar.DATE,1);//把日期设置为当月第一天     
       str=sdf.format(lastDate.getTime());    
       return str;      
    }    
        
    private int getYearPlus(){    
        Calendar cd = Calendar.getInstance();    
        int yearOfNumber = cd.get(Calendar.DAY_OF_YEAR);//获得当天是一年中的第几天    
        cd.set(Calendar.DAY_OF_YEAR,1);//把日期设为当年第一天    
        cd.roll(Calendar.DAY_OF_YEAR,-1);//把日期回滚一天。    
        int MaxYear = cd.get(Calendar.DAY_OF_YEAR);    
        if(yearOfNumber == 1){    
            return -MaxYear;    
        }else{    
            return 1-yearOfNumber;    
        }    
    }    
  //获得本年第一天的日期    
    public String getCurrentYearFirst(){    
        int yearPlus = this.getYearPlus();    
        GregorianCalendar currentDate = new GregorianCalendar();    
        currentDate.add(GregorianCalendar.DATE,yearPlus);    
        Date yearDay = currentDate.getTime();    
        DateFormat df = DateFormat.getDateInstance();    
        String preYearDay = df.format(yearDay);    
        return preYearDay;    
    }    
        
        
  //获得本年最后一天的日期 *    
    public String getCurrentYearEnd(){    
        Date date = new Date();    
        SimpleDateFormat   dateFormat   =   new   SimpleDateFormat("yyyy");//可以方便地修改日期格式       
        String  years  = dateFormat.format(date);       
        return years+"-12-31";    
    }    
        
        
  //获得上年第一天的日期 *    
    public String getPreviousYearFirst(){    
        Date date = new Date();    
        SimpleDateFormat   dateFormat   =   new   SimpleDateFormat("yyyy");//可以方便地修改日期格式       
        String  years  = dateFormat.format(date); int years_value = Integer.parseInt(years);      
        years_value--;    
        return years_value+"-1-1";    
    }    
        
  //获得上年最后一天的日期    
    public String getPreviousYearEnd(){    
        weeks--;    
        int yearPlus = this.getYearPlus();    
        GregorianCalendar currentDate = new GregorianCalendar();    
        currentDate.add(GregorianCalendar.DATE,yearPlus+MaxYear*weeks+(MaxYear-1));    
        Date yearDay = currentDate.getTime();    
        DateFormat df = DateFormat.getDateInstance();    
        String preYearDay = df.format(yearDay);    
        getThisSeasonTime(11);    
        return preYearDay;    
    }    
        
  //获得本季度    
    public String getThisSeasonTime(int month){    
        int array[][] = {{1,2,3},{4,5,6},{7,8,9},{10,11,12}};    
        int season = 1;    
        if(month>=1&&month<=3){    
            season = 1;    
        }    
        if(month>=4&&month<=6){    
            season = 2;    
        }    
        if(month>=7&&month<=9){    
            season = 3;    
        }    
        if(month>=10&&month<=12){    
            season = 4;    
        }    
        int start_month = array[season-1][0];    
        int end_month = array[season-1][2];    
            
        Date date = new Date();    
        SimpleDateFormat   dateFormat   =   new   SimpleDateFormat("yyyy");//可以方便地修改日期格式       
        String  years  = dateFormat.format(date);       
        int years_value = Integer.parseInt(years);    
            
        int start_days =1;//years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month);    
        int end_days = getLastDayOfMonth(years_value,end_month);    
        String seasonDate = years_value+"-"+start_month+"-"+start_days+";"+years_value+"-"+end_month+"-"+end_days;    
        return seasonDate;    
            
    }    
        
    /**   
     * 获取某年某月的最后一天   
     * @param year 年   
     * @param month 月   
     * @return 最后一天   
     */    
   private int getLastDayOfMonth(int year, int month) {    
         if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8    
                   || month == 10 || month == 12) {    
               return 31;    
         }    
         if (month == 4 || month == 6 || month == 9 || month == 11) {    
               return 30;    
         }    
         if (month == 2) {    
               if (isLeapYear(year)) {    
                   return 29;    
               } else {    
                   return 28;    
               }    
         }    
         return 0;    
   }    
   /**   
    * 是否闰年   
    * @param year 年   
    * @return    
    */    
  public boolean isLeapYear(int year) {    
        return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);    
  }    
}