月份、季度、周

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author fan
 */
public class Test {
    
    private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
    
    public static void main(String[] args) throws Exception{
        System.out.println(getMonthList());
        System.out.println(getQuarterList());
        System.out.println(getWeekList());
    }
    
    /**
     * 获取当前时间向前推12月的时间列表
     * */
    public static List<Object> getMonthList(){
        // 获取当前时间往前推12个月的年-月列表
        List<Object> monthList = new ArrayList<Object>();
        for(int i=1; i<=12; i++){
            Map<String, Object> date = getMonthInfo(i);
            monthList.add(date.get("month"));
        }
        return monthList;
    }
    
    /**
     * 获取月列表
     * @param n
     * @return
     */
    private static Map<String, Object> getMonthInfo(int n){
        Map<String, Object> monthMap = new HashMap<String, Object>();
        Calendar calendar = Calendar.getInstance();
        calendar.add(Calendar.MONTH, -n);
        SimpleDateFormat sfM = new SimpleDateFormat("yyyy-MM");
        monthMap.put("month", sfM.format(calendar.getTime()));
        
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        monthMap.put("start", dateFormat.format(calendar.getTime()));
        calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DATE));
        monthMap.put("end", dateFormat.format(calendar.getTime()));
        return monthMap;
    }
    
    /**
     * 获取当前时间向前推4个季度的时间列表
     * */
    public static List<Object> getQuarterList(){
        List<Object> quarterList = new ArrayList<Object>();
        for(int i=1; i<=4; i++){
            Map<String, Object> date = getQuarterInfo(i);
            quarterList.add(date.get("year").toString()+"年"+date.get("quarter"));
        }
        return quarterList;
    }
    
    /** 
     * 从当前时间往前推几个季度
     * n：正数：向前推几个季度；负数向后推几个季度 
     * @return 
     * 例如：当前时间是2016-12-23，则getQuarterInfo(1)==>{start=2016-07-01, year=2016, end=2016-09-30, quarter=第三季度}
     *                           getQuarterInfo(2)==>{start=2016-04-01, year=2016, end=2016-06-30, quarter=第二季度}
     *                           getQuarterInfo(3)==>{start=2016-01-01, year=2016, end=2016-03-31, quarter=第一季度}
     *                           getQuarterInfo(4)==>{start=2015-10-01, year=2015, end=2015-12-31, quarter=第四季度}
     *                           getQuarterInfo(-1)==>{start=2017-01-01, year=2017, end=2017-03-31, quarter=第一季度}
     */  
    public static Map<String, Object> getQuarterInfo(int n) {
        Calendar startCalendar = Calendar.getInstance();  
        startCalendar.set(Calendar.MONTH, ((int) startCalendar.get(Calendar.MONTH) / 3 - n) * 3);
        startCalendar.set(Calendar.DAY_OF_MONTH, 1);  
          
        Calendar endCalendar = Calendar.getInstance();  
        endCalendar.set(Calendar.MONTH, ((int) endCalendar.get(Calendar.MONTH) / 3 - n) * 3 + 2);
        endCalendar.set(Calendar.DAY_OF_MONTH, endCalendar.getActualMaximum(Calendar.DAY_OF_MONTH));
        // 存储季度信息
        Map<String, Object> quarterMap = new HashMap<String, Object>();
        // 季度
        switch(startCalendar.get(Calendar.MONTH) + 1){
            case 1 : quarterMap.put("quarter", "第一季度"); break;
            case 4 : quarterMap.put("quarter", "第二季度"); break;
            case 7 : quarterMap.put("quarter", "第三季度"); break;
            case 10 : quarterMap.put("quarter", "第四季度");
        }
        // 年份
        quarterMap.put("year", startCalendar.get(Calendar.YEAR));
        // 季度开始时间（天）
        quarterMap.put("start", dateFormat.format(startCalendar.getTime()));
        // 季度结束时间（天）
        quarterMap.put("end", dateFormat.format(endCalendar.getTime()));
        return quarterMap;
    }
    
    public static List<Object> getWeekList(){
        List<Object> weekList = new ArrayList<Object>();
        for(int i=1; i<=52; i++){
            Map<String, Object> week = getWeekInfo(i);
            weekList.add(week.get("year").toString()+"年"+week.get("week").toString()+"周");
        }
        return weekList;
    }
    
    /**
     * 向前推多少周正数向前，负数向后
     * @param n
     */
    public static Map<String, Object> getWeekInfo(int n){
        Map<String, Object> weekMap = new HashMap<String, Object>();
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(new Date());
        if(1 == calendar.get(Calendar.DAY_OF_WEEK)) {  
            calendar.add(Calendar.DAY_OF_MONTH, -1);
        }
        // 设置周一为第一天
        calendar.setFirstDayOfWeek(Calendar.MONDAY);
        calendar.add(Calendar.DATE, calendar.getFirstDayOfWeek() - calendar.get(Calendar.DAY_OF_WEEK) - 7 * n);
        weekMap.put("week", calendar.get(Calendar.WEEK_OF_YEAR));
        weekMap.put("start", dateFormat.format(calendar.getTime()));
        calendar.add(Calendar.DATE, 6);
        weekMap.put("year", calendar.get(Calendar.YEAR));
        weekMap.put("end", dateFormat.format(calendar.getTime()));
        return weekMap;
    }

}