看到一个不错的东东：获取各种常用时间java

以下内容转载自论坛某位同志的文章，觉得以后可能用得上，所以就转过来了！

import java.text.DateFormat;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (C)  2008</p>
 *
 * <p>Company: ZZXT</p>
 *
 * @author 武尧      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);
	    // int hour=c.get(Calendar.DAY_OF_WEEK);
	    // hour中存的就是星期几了，其范围 1~7
	    // 1=星期日 7=星期六，其他类推
	    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
	   //lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天
	   
	   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);//加一个年
 	  lastDate.set(Calendar.DAY_OF_YEAR, 1);
 	 lastDate.roll(Calendar.DAY_OF_YEAR, -1);
 	   str=sdf.format(lastDate.getTime());
 	   return str;  
    }
    
  //获得明年第一天的日期
    public String getNextYearFirst(){
    	weeks--;
    	Calendar cd = Calendar.getInstance();
    	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);	//获得本年有多少天
    	int yearPlus = this.getYearPlus();
    	GregorianCalendar currentDate = new GregorianCalendar();
    	currentDate.add(GregorianCalendar.DATE,MaxYear-(yearPlus*weeks)+2);
    	Date yearDay = currentDate.getTime();
    	DateFormat df = DateFormat.getDateInstance();
    	String preYearDay = df.format(yearDay);
    	return preYearDay;
    	
    }
    
  //获得本年有多少天
    private int getMaxYear(){
    	Calendar cd = Calendar.getInstance();
    	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);	
    	return MaxYear;
    }
    
    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);
  }
}