Java编程时间日期API实例解析

本文实例主要是关于java8中的新特性，时间日期api的相关实例，具体如下：

package com.effective.common.base.date;
import java.time.instant;
import java.time.localdate;
import java.time.localdatetime;
import java.time.localtime;
import java.time.period;
import java.time.zoneid;
import java.time.format.datetimeformatter;
import java.time.temporal.chronounit;
import java.util.date;
/**
 * 日期工具类
 * @author yanweiqi
 * @since 2016-5-6
 *
 */
public class localdateutils {
	private static zoneid zone = zoneid.systemdefault();
	/**
   * 字符串转date
   * @param date
   * @return
   * @throws exception
   */
	public static date converttodate(string date) throws exception{
		localdate localdate = null;
		if(null == date){
			throw new nullpointerexception("date isn't null");
		} else {
			localdate = localdate.parse(date);
			return converttodate(localdate);
		}
	}
	/**
   * 字符串转localdatetime
   * @param date
   * @return localdatetime
   */
	public static localdatetime converttolocaldatetime(string date){
		localdatetime localdatetime = null;
		if(null == date){
			throw new nullpointerexception("date isn't null");
		} else {
			localdatetime = localdatetime.parse(date);
			return localdatetime;
		}
	}
	/**
   * localdate转date
   * @param localdate
   * @return date
   */
	public static date converttodate(localdate localdate){
		instant instant = localdate.atstartofday().atzone(zone).toinstant();
		return date.from(instant);
	}
	/**
   * localdate转date
   * @param localdatetime
   * @return date
   */
	public static date converttodate(localdatetime localdatetime){
		instant instant = localdatetime.atzone(zone).toinstant();
		return date.from(instant);
	}
	/**
   * date转localdate
   * @param date
   * @return localdate
   */
	public static localdate converttolocaldate(date date){
		instant instant = date.toinstant();
		return converttolocaldatetime(instant).tolocaldate();
	}
	/**
   * date转localtime
   * @param date
   * @return localdate
   */
	public static localtime converttolocaltime(date date){
		instant instant = date.toinstant();
		return converttolocaldatetime(instant).tolocaltime();
	}
	/**
   * date转localdatetime
   * @param date
   * @return localdate
   */
	public static localdatetime converttolocaldatetime(date date){
		instant instant = date.toinstant();
		return converttolocaldatetime(instant);
	}
	/**
   * instant转localdatetime
   * @param instant
   * @return
   */
	public static localdatetime converttolocaldatetime(instant instant){
		return localdatetime.ofinstant(instant, zone);
	}
	/**
   * localdatetime转instant
   * @param localdatetime
   * @return
   */
	public static instant converttoinstant(localdatetime localdatetime){
		return localdatetime.atzone(zone).toinstant();
	}
	/**
   * localdate转instant
   * @param localdate
   * @return
   */
	public static instant converttoinstant(localdate localdate){
		return localdate.atstartofday(zone).toinstant();
	}
	/**
   * localdate转localdatetime
   * @param localdate
   * @return localdatetime
   */
	public static localdatetime converttolocaldatetime(localdate localdate){
		return localdate.atstartofday();
	}
	/**
   * 日周期格式化
   * @param localdatetime
   * @param formatstyle
   * @return
   */
	public static string formatter(localdatetime localdatetime, string formatstyle){
		return datetimeformatter.ofpattern(formatstyle).format(localdatetime);
	}
	/**
   * 设置年
   * @param sourcedate
   * @param year
   * @return localdatetime
   */
	public static localdatetime setyear(localdatetime sourcedate, integer year){
		return sourcedate.withyear(year);
	}
	/**
   * 设置月
   * @param sourcedate
   * @param month
   * @return localdatetime
   */
	public static localdatetime setmonth(localdatetime sourcedate, integer month){
		return sourcedate.withmonth(month);
	}
	/**
   * 设置天
   * @param sourcedate
   * @param month
   * @return localdatetime
   */
	public static localdatetime setdayofmonth(localdatetime sourcedate, integer dayofmonth){
		return sourcedate.withdayofmonth(dayofmonth);
	}
	/**
   * 设置小时
   * @param sourcedate
   * @param hour
   * @return
   */
	public static localdatetime sethour(localdatetime sourcedate,integer hour){
		return sourcedate.withhour(hour);
	}
	/**
   * 设置分钟
   * @param sourcedate
   * @param minute
   * @return
   */
	public static localdatetime setminute(localdatetime sourcedate,integer minute){
		return sourcedate.withminute(minute);
	}
	/**
   * 设置秒
   * @param sourcedate
   * @param second
   * @return
   */
	public static localdatetime setsecond(localdatetime sourcedate,integer second){
		return sourcedate.withsecond(second);
	}
	/**
   * 修改年月日
   * @param sourcedate
   * @param year
   * @param month
   * @param dayofmonth
   * @return
   */
	public static localdatetime setymd(localdatetime sourcedate, integer year, integer month, integer dayofmonth) {
		return sourcedate.withyear(year).withmonth(month).withdayofmonth(dayofmonth);
	}
	/**
   * 修改时分秒
   * @param sourcedate
   * @param hour
   * @param minute
   * @param second
   * @return
   */
	public static localdatetime sethms(localdatetime sourcedate,integer hour, integer minute, integer second) {
		return sourcedate.withhour(hour).withminute(minute).withsecond(second);
	}
	/**
   * 计算相差的天数
   * @param begindate
   * @param enddate
   * @return
   */
	public static int getinteverdays(localdate begindate,localdate enddate){
		period period = period.between(begindate, enddate);
		return period.getdays();
	}
	/**
   * 日期加减
   * @param num 数量
   * @param unit 单位
   * @param localdate 原日期
   * @return localdate 增加后的日期
   */
	@suppresswarnings("static-access")
	  public static localdate addlocaldate(long num,chronounit unit,final localdate localdate){
		localdate resultdate;
		if(num > 0){
			resultdate = localdate.now().plus(num, unit);
		} else {
			resultdate = localdate.now().minus(math.abs(num), unit);
		}
		return resultdate;
	}
	/**
   * 日期时分秒加
   * @param num 数量
   * @param unit 单位
   * @param localdatetime 原日期
   * @return localdatetime 增加后的日期
   */
	@suppresswarnings("static-access")
	  public static localdatetime addlocaldatetime(long num,chronounit unit,localdatetime localdatetime){
		localdatetime resultdatetime;
		if(num > 0){
			resultdatetime = localdatetime.now().plus(num, unit);
		} else {
			resultdatetime = localdatetime.now().minus(math.abs(num),unit);
		}
		return resultdatetime;
	}
	/**
   * 时分秒加减
   * @param num 数量
   * @param unit 单位
   * @param localtime 原日期
   * @return localdatetime 增加后的日期
   */
	@suppresswarnings("static-access")
	  public static localtime addlocaltime(long num,chronounit unit,localtime localtime){
		localtime resulttime;
		if(num > 0){
			resulttime = localtime.now().plus(num, unit);
		} else {
			resulttime = localtime.now().minus(math.abs(num), unit);
		}
		return resulttime;
	}
	public static void main(string[] args){
		localdatetime time = localdatetime.now();
		string rr = formatter(time, "yyyy-mm-dd hh:mm:ss");
		system.out.println(rr);
		localdatetime time2 = addlocaldatetime(-2, chronounit.hours, time);
		string yy = formatter(time2, "yyyy-mm-dd hh:mm:ss");
		system.out.println(yy);
	}

代码涉及时间日期类的使用等内容，具有简单注释，大家可自行参考。

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