java怎么获取年时间？

[兮家小二]

请问java 怎么获取今年 一月一号 0点0分0秒的时间，和去年最后一天23点59分59秒？

[咦哟~~~]

额，你是用来做啥，你都说的这么清楚了，直接写成字符串，转成date不就好了。。。 或者你是想写个计时器 还是什么的 没有懂你的需求

[兮家小二]

api获取，写工具类，周，日，月. 和7天内，月内，年内都有了，就差获取今年的时间，，通过两个时间段查询sql，不想写死 今年， 一月一号 0点0分0秒 到现在 去年， 去一月一号 0点0分0秒 到 去年最后一天23点59分59秒，

[天行归来]

我有日期时间工具类有封装了个去掉时间函数，你可以根据自己需要改改

	public static Date truncateTime(Date date){
		Calendar cd = Calendar.getInstance();
		cd.setTime(date);
		cd.set(Calendar.HOUR_OF_DAY, 0);
		cd.set(Calendar.MINUTE, 0);
		cd.set(Calendar.SECOND, 0);
		cd.set(Calendar.MILLISECOND, 0);
		
		return cd.getTime();	
	}

[十八道胡同]

package com.demo;


import java.util.Calendar;
import java.util.Date;
import java.util.Objects;

public class Test {

    public static void main(String[] args){
        System.out.println(getFirstSecond(new Date()));
        System.out.println(getLastSecond(new Date()));
    }

    public static Date getFirstSecond(Date date){
        Calendar cd = Calendar.getInstance();
        cd.setTime(date);
       cd.set(Calendar.HOUR_OF_DAY, 0);
       cd.set(Calendar.MINUTE, 0);
       cd.set(Calendar.SECOND, 0);
        cd.set(Calendar.DAY_OF_YEAR,1);
        return cd.getTime();
    }
    public static Date getLastSecond(Date date){
        Calendar cd = Calendar.getInstance();
        cd.setTime(date);
        cd.set(Calendar.HOUR_OF_DAY, 0);
        cd.set(Calendar.MINUTE, 0);
        cd.set(Calendar.SECOND, 0);
        cd.set(Calendar.DAY_OF_YEAR,1);
        cd.add(Calendar.YEAR,1);
        cd.add(Calendar.SECOND,-1);
        return cd.getTime();
    }
}

[bcsflilong]

package csdn.test;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class DateTest {
	
	private final static SimpleDateFormat DEFAULT_FORMAT=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	
	/**
	 * 格式化日期
	 * @param date 日期对象
	 * @return String 日期字符串
	 */
	public static String formatDate(Date date){
		SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		String sDate = f.format(date);
		return sDate;
	}
	
	/**
	 * 获取当年的第一天
	 * @param year
	 * @return
	 */
	public static Date getCurrYearFirst(){
		Calendar currCal=Calendar.getInstance();  
		int currentYear = currCal.get(Calendar.YEAR);
		return getYearFirst(currentYear);
	}
	
	public static String getBeforeYearFirst(){
		Date currYear=getCurrYearFirst();
		Calendar calendar=Calendar.getInstance();
		calendar.setTime(currYear);

		calendar.set(Calendar.SECOND, -1);
		
		return DEFAULT_FORMAT.format(calendar.getTime());
	}
	
	/**
	 * 获取当年的最后一天
	 * @param year
	 * @return
	 */
	public static Date getCurrYearLast(){
		Calendar currCal=Calendar.getInstance();  
		int currentYear = currCal.get(Calendar.YEAR);
		return getYearLast(currentYear);
	}
	public static Date getYearFirst(int year){
		Calendar calendar = Calendar.getInstance();
		calendar.clear();
		calendar.set(Calendar.YEAR, year);
		Date currYearFirst = calendar.getTime();
		return currYearFirst;
	}
	
	/**
	 * 获取某年最后一天日期
	 * @param year 年份
	 * @return Date
	 */
	public static Date getYearLast(int year){
		Calendar calendar = Calendar.getInstance();
		calendar.clear();
		calendar.set(Calendar.YEAR, year);
		calendar.roll(Calendar.DAY_OF_YEAR, -1);
		Date currYearLast = calendar.getTime();
		
		return currYearLast;
	}
	
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		System.out.println(formatDate(getCurrYearFirst()));
		System.out.println(getBeforeYearFirst());
		System.out.println(formatDate(getCurrYearLast()));
		
	}

}

[十八道胡同]

获取时间 尽量用Calendar类来做