Calendar c = Calendar.getInstance(TimeZone.getTimeZone("GMT+08:00"));    //获取东八区时间

int year = c.get(Calendar.YEAR);    //获取年

int month = c.get(Calendar.MONTH) + 1;   //获取月份，0表示1月份

int day = c.get(Calendar.DAY_OF_MONTH);    //获取当前天数

int first = c.getActualMinimum(c.DAY_OF_MONTH);    //获取本月最小天数

int last = c.getActualMaximum(c.DAY_OF_MONTH);    //获取本月最大天数

int time = c.get(Calendar.HOUR_OF_DAY);       //获取当前小时

int min = c.get(Calendar.MINUTE);          //获取当前分钟

int xx = c.get(Calendar.SECOND);          //获取当前秒

SimpleDateFormat s=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

String curDate = s.format(c.getTime());  //当前日期

System.out.println("当前时间："+year + "-" + month + "-"+ day + " "+time + ":" + min +":" + xx);

System.out.println("第一天和最后天：" + first +"," + last);

System.out.println("当前日期curDate====：" + curDate);

c.add(Calendar.YEAR, 1);

c.add(Calendar.MONTH, 1);

c.add(Calendar.DAY_OF_MONTH, 1);

int year2 = c.get(Calendar.YEAR);

int month2 = c.get(Calendar.MONTH) + 1;

int day2 = c.get(Calendar.DAY_OF_MONTH);

int firstD = c.getActualMinimum(c.DAY_OF_MONTH);

int lastD = c.getActualMaximum(c.DAY_OF_MONTH);

System.out.println("当前时间："+year2 + "-" + month2 + "-"+ day2 + " "+time + ":" + min +":" + xx);

System.out.println("第一天和最后天：" + firstD +"," + lastD);

Calendar c=Calendar.getInstance();

c.add(Calendar.MONTH, -1);//上个月

SimpleDateFormat s=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

String year=String.valueOf(c.get(Calendar.YEAR));

String topDay = String.valueOf(c.getActualMinimum(Calendar.DAY_OF_MONTH));

String lastDay = String.valueOf(c.getActualMaximum(Calendar.DAY_OF_MONTH)); 

//上个月

String lastMonth=String.valueOf(c.get(Calendar.MONTH)+1).length()==2?String.valueOf(c.get(Calendar.MONTH)+1):"0"+String.valueOf(c.get(Calendar.MONTH)+1);

String topDayMonth=year+"-"+lastMonth+"-"+"01" + " 00:00:00";

String lastDayMonth = year+"-"+lastMonth+"-"+lastDay+ " 23:59:59";

System.out.println("###year:" + year);

System.out.println("###last month:" + lastMonth);

System.out.println("###topday:" + topDayMonth);

System.out.println("###lastday:" + lastDayMonth);

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

public class DateTest {

    public static Date geLastWeekMonday(Date date) {

        Calendar cal = Calendar.getInstance();

        cal.setTime(getThisWeekMonday(date));

        cal.add(Calendar.DATE, -7);

        return cal.getTime();

    }

    public static Date getThisWeekMonday(Date date) {

        Calendar cal = Calendar.getInstance();

        cal.setTime(date);

        // 获得当前日期是一个星期的第几天

        int dayWeek = cal.get(Calendar.DAY_OF_WEEK);

        if (1 == dayWeek) {

            cal.add(Calendar.DAY_OF_MONTH, -1);

        }

        // 设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一

        cal.setFirstDayOfWeek(Calendar.MONDAY);

        // 获得当前日期是一个星期的第几天

        int day = cal.get(Calendar.DAY_OF_WEEK);

        // 根据日历的规则，给当前日期减去星期几与一个星期第一天的差值

        cal.add(Calendar.DATE, cal.getFirstDayOfWeek() - day);

        return cal.getTime();

    }

    public static Date getNextWeekMonday(Date date) {

        Calendar cal = Calendar.getInstance();

        cal.setTime(getThisWeekMonday(date));

        cal.add(Calendar.DATE, 7);

        return cal.getTime();

    }

    public static void main(String[] args) {

        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

        try {

            Date date = sdf.parse("2017-09-10");

            System.out.println("今天是" + sdf.format(date));

            System.out.println("上周一" + sdf.format(geLastWeekMonday(date)));

            System.out.println("本周一" + sdf.format(getThisWeekMonday(date)));

            System.out.println("下周一" + sdf.format(getNextWeekMonday(date)));

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}

今天是2017-09-10

上周一2017-08-28

本周一2017-09-04

下周一2017-09-11