java中的时间取值

转帖，可能有误

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);
  }
}