Date类相关使用

package com.sangyee.point.common;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.Iterator;
import java.util.List;

public class DateTools {
 //存储每一天的日期
    private List<Date> dayList = new ArrayList<Date>();  
 public   List getDayTime(int beginYears,int beginMonths,  int beginDay, int endYears,int endMonths, int endDay)
 {
  //获取时间对象
  Calendar  calendar1 =Calendar.getInstance();
  //设置开始时间(beginYears/beginMonths/beginDay)
  calendar1.set(Calendar.YEAR,beginYears);
  calendar1.set(Calendar.MONTH,beginMonths-1); //月份默认从0开始 1月为0
  calendar1.set(Calendar.DATE,beginDay-1);
   // 设置结束时间(endYears/endMonths/endDay)
        Calendar calendar2 = Calendar.getInstance();  
        calendar2.set(Calendar.YEAR, endYears);  
        calendar2.set(Calendar.MONTH,endMonths-1);  
        calendar2.set(Calendar.DATE, endDay+1); 
        //获取时间
        Date startDate = calendar1.getTime();  
        Date endDate = calendar2.getTime();
        this.countDays(startDate, endDate);
        List<Date> list = this.getDayList();
        System.out.println("1:"+list.size());
        //格式化时间
        //  SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd ");  
        //
        // for (Date date : list) {  
        //  System.out.println(dateFormat.format(date));  
        //}  
  return list;
 }
 
 /**
 public static void main(String[] args) {
  DateTools tools = new DateTools();
  List<Date> list = tools.getDayTime(2010,7,15,2010,12,15);
  System.out.println(list.size());
   SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd ");
  for(Date date: list)
  { 
   System.out.println(dateFormat.format(date));  
  }
 }
  **/ 
 //返回集合（集合中包含每一天得日期）
 
   public long countDays(Date startDate, Date endDate) {  
         
         long startValue = startDate.getTime();  
           
         long endValue = endDate.getTime();  
           
         if (startValue > endValue) {  
             long temp = endValue;  
             endValue = startValue;  
             startValue = temp;  
         }  
           
         // 计算天数差  
         long result = (endValue - startValue) / 1000 / 60 / 60 / 24;  
           
         Calendar cal = Calendar.getInstance();  
       
         cal.setTime(startDate);  
           
         // 计算期间的每一天  
         for (int index = 1; index < result; index++) {  
             cal.add(Calendar.DATE, 1);  
             dayList.add(cal.getTime());  
         }  
           
         return result;  
     }  
 
    public List<Date> getDayList() {  
         return dayList;  
     }  
  
    //按周显示。获取当月每周得起止日期
    public List<Date> getWeek(int years ,int Months )
    {
     boolean isWeekBegin=false;
     List<Date> dateList = new ArrayList();
          SimpleDateFormat   sdf=new   SimpleDateFormat( "yyyy-MM-dd ");
        
          Calendar   c=Calendar.getInstance();
          c.set(Calendar.YEAR,years);
          c.set(Calendar.MONTH,Months-1);
          c.set(Calendar.DAY_OF_MONTH,1);
          boolean   isHalfWeekAhead=false;
          if(c.get(c.DAY_OF_WEEK)!=c.getFirstDayOfWeek()){
              isHalfWeekAhead=true;
          }
          while(c.get(Calendar.MONTH)==Months-1){
              if(c.get(Calendar.DAY_OF_WEEK)==c.getFirstDayOfWeek()){
                  Date   start=c.getTime();
                  c.add(c.DAY_OF_MONTH,6);
                  Date   end=c.getTime();
                  if(isHalfWeekAhead){
                      Date   fsd=new   Date(start.getTime()-7*24L*3600L*1000L);
                      Date   fed=new   Date(end.getTime()-7*24L*3600L*1000L);
                      if(isWeekBegin==false)
                      {
                       dateList.add(fsd);
                       isWeekBegin=true;
                      }
                    if(isWeekBegin==true)
                      {
                       dateList.add(fed);
                      }
                     
       
                     // System.out.println(sdf.format(fsd)+ "--- "+sdf.format(fed));
                      isHalfWeekAhead=false;
                  }
                 
                  dateList.add(start);
                  dateList.add(end);
                 
                  //System.out.println(sdf.format(start)+ "--- "+sdf.format(end));
              }
              c.add(c.DAY_OF_MONTH,1);
          }
     return dateList;
    }
    //按月显示，默认显示一年中12个月，获取每月的第一天和最后一天的日期
    public List<Date>  TimeMonths(int year) {  
       SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");  
       
        List<Date>  datelist =  new ArrayList();
       Calendar  date = Calendar.getInstance();  
         date.set(Calendar.YEAR, year);  
         for (int i = 0; i < 12; i++) {  
  
             date.set(Calendar.MONTH, i);  
             int minMonthDate = date.getActualMinimum(Calendar.DAY_OF_MONTH);  
             date.set(Calendar.DATE, minMonthDate);  
             String startMonth = dateFormat.format(date.getTime());
             //保存开始时间
             datelist.add(date.getTime());
             int maxMonthDate = date.getActualMaximum(Calendar.DAY_OF_MONTH);  
             date.set(Calendar.DATE, maxMonthDate);
             //保存结束时间
             String endMonth = dateFormat.format(date.getTime());  
             datelist.add(date.getTime());       
         }  
        
         return datelist;
     }  
  
 
   
    public static void main(String[] args) {
  DateTools tools = new DateTools();
  List list  =tools.getDayTime(2010, 8, 7, 2010, 9, 30);
   SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
  if(list!=null)
  {
   Iterator it = list.iterator();
   while(it.hasNext())
   {
    
    System.out.println(dateFormat.format(it.next()));
   }
   
   
  }
 }
}