java写的日期工具，根据设置日期获取指定的一周或者一个月的所有日期

在做项目中遇到一个关于日记的问题，国外算一周是从周末到周六，而国内一周是从周一到周天。很多软件需要获取一个月或者一周的所有日期来进行数据统计，为了方便大家开发，避免重复劳动。特地写了一个DateTools工具类，使用方法都在main函数里。

import java.text.Format;  
import java.text.ParseException;  
import java.text.SimpleDateFormat;  
import java.util.ArrayList;  
import java.util.Calendar;  
import java.util.Date;  
import java.util.List;  
  
public class DateTools {  
       
    public static void main(String[] args) {  
         System.out.println("--------------当前日期下一周的每一天--------------");  
     List<String> lst=  getALlweekDays();//获取当前日期下，一周的每一天  
     for(String s:lst)  
     {  
         System.out.println(s);  
     }  
     List <String>lst2=getAllDaysMonth();//获取当前日期下，一个月的每一天  
     System.out.println("--------------一个月的每一天--------------");  
     for(String s2:lst2)  
     {  
       System.out.println(s2);  
     }  
     System.out.println("--------------根据特定的日期‘2014-8-1’获取特定日期所在一周的每一天--------------");  
     Date d=DateTools.paraseStringToDate("2014-8-1");  
     List <String>lst3=DateTools.getAllweekDays(d);  
     for(String s3:lst3)  
     {  
         System.out.println(s3);  
     }  
     System.out.println("--------------根据特定的日期‘2014-8-1’获取特定日期所在一个月的每一天--------------");  
     Date d2=DateTools.paraseStringToDate("2014-8-1");  
     List <String>lst4=DateTools.getAllDaysMonthByDate(d2);  
     for(String s3:lst4)  
     {  
         System.out.println(s3);  
     }  
       
    }  
   
    private static final int FIRST_DAY = Calendar.MONDAY;  
    private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");  
      
    public String getMonthStart()//获取月初日期  
    {  
       Date d = new Date();  
          // 月初  
       // System.out.println("月初" + sdf.format(getMonthStart(d)));  
       return sdf.format(getMonthStart(d));  
    }  
    public static String getMonthStartStr(Date d)//根据传入日期来获取一个月的开始时间  
    {  
       return sdf.format(getMonthStart(d));  
    }  
   public static String getMonthEndStr(Date d)//根据传入时间获取一个月月末时间  
    {  
         
      return sdf.format(getMonthEnd(d));  
    }  
   public static List<String>getAllDaysMonthByDate(Date d)//根据传入的日期获取所在月份所有日期  
   {  
        List<String> lst=new ArrayList();  
        Date date = getMonthStart(d);  
        Date monthEnd = getMonthEnd(d);  
        while (!date.after(monthEnd)) {  
            //System.out.println(sdf.format(date));  
         lst.add(sdf.format(date));  
            date = getNext(date);  
        }  
        return lst;  
   }  
   public static Date paraseStringToDate(String timestr )//将字符串转化为日期  
   {  
       Date date=null;  
        
            
           Format f = new SimpleDateFormat("yyyy-MM-dd");  
            try {  
                date = (Date) f.parseObject(timestr);  
            } catch (ParseException e) {  
                // TODO Auto-generated catch block  
                e.printStackTrace();  
            }  
       return date;  
   }  
    
   public String getMonthEnd()//获取月末日期  
   {  
       Date d = new Date();  
      return sdf.format(getMonthEnd(d));  
   }  
    public static List<String>getAllDaysMonth()  
    {  
        List<String> lst=new ArrayList();  
         Date d = new Date();  
         // 月初  
        // System.out.println("月初" + sdf.format(getMonthStart(d)));  
         // 月末  
         //System.out.println("月末" + sdf.format(getMonthEnd(d)));  
    
         Date date = getMonthStart(d);  
         Date monthEnd = getMonthEnd(d);  
         while (!date.after(monthEnd)) {  
             //System.out.println(sdf.format(date));  
             lst.add(sdf.format(date));  
             date = getNext(date);  
         }  
         return lst;  
    }  
    private static Date getMonthStart(Date date) {  
        Calendar calendar = Calendar.getInstance();  
        calendar.setTime(date);  
        int index = calendar.get(Calendar.DAY_OF_MONTH);  
        calendar.add(Calendar.DATE, (1 - index));  
        return calendar.getTime();  
    }  
   
    private static Date getMonthEnd(Date date) {  
        Calendar calendar = Calendar.getInstance();  
        calendar.setTime(date);  
        calendar.add(Calendar.MONTH, 1);  
        int index = calendar.get(Calendar.DAY_OF_MONTH);  
        calendar.add(Calendar.DATE, (-index));  
        return calendar.getTime();  
    }  
   
    private static Date getNext(Date date) {  
        Calendar calendar = Calendar.getInstance();  
        calendar.setTime(date);  
        calendar.add(Calendar.DATE, 1);  
        return calendar.getTime();  
    }  
    public static String getWeekStartDay(Date d) {//根据日期来获取一周的第一天  
        Calendar c = Calendar.getInstance();  
       List <String>lst=new ArrayList();  
        c.setTime(d);  
        setToFirstDay(c);  
        for (int i = 0; i < 7; i++) {  
            String day = printDay(c);  
            lst.add(day);  
            c.add(Calendar.DATE, 1);  
        }  
        return lst.get(0);  
    }  
    public static String getWeekEndtDay(Date d) {//根据日期来获取一周的最后一天  
        Calendar c = Calendar.getInstance();  
       List <String>lst=new ArrayList();  
        c.setTime(d);  
        setToFirstDay(c);  
        for (int i = 0; i < 7; i++) {  
            String day = printDay(c);  
            lst.add(day);  
            c.add(Calendar.DATE, 1);  
        }  
        return lst.get(6);  
    }  
    public static List<String> getAllweekDays(Date d) {//根据日期来获取其所在周的每一天  
        Calendar c = Calendar.getInstance();  
       List <String>lst=new ArrayList();  
        c.setTime(d);  
        setToFirstDay(c);  
        for (int i = 0; i < 7; i++) {  
            String day = printDay(c);  
            lst.add(day);  
            c.add(Calendar.DATE, 1);  
        }  
        return lst;  
    }  
    public static List<String> getALlweekDays() {  
        List<String>lst=new ArrayList();  
        Calendar calendar = Calendar.getInstance();  
        setToFirstDay(calendar);  
        for (int i = 0; i < 7; i++) {  
            String day=printDay(calendar);  
            lst.add(day);  
            calendar.add(Calendar.DATE, 1);  
        }  
        return lst;  
    }  
   
    private static void setToFirstDay(Calendar calendar) {  
        while (calendar.get(Calendar.DAY_OF_WEEK) != FIRST_DAY) {  
            calendar.add(Calendar.DATE, -1);  
        }  
    }  
   
    private static String  printDay(Calendar calendar) {  
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");  
        return dateFormat.format(calendar.getTime());  
    }  
   
}