java Date相关

    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);   
}   
} 
package com.hefeng.test;

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

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"));
}


/**
     * 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
        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(){
    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);
           str=sdf.format(lastDate.getTime());
   return str; 
    
    }
    
//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);
}
}