package com.kidgrow.common.utils;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.text.DateFormat;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.Calendar;
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import java.util.Date;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* 石家庄喜高科技有限责任公司 版权所有 © Copyright 2020<br>
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*
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* @Description: 日期工具类<br>
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* @Project: <br>
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* @CreateDate: Created in 2020/2/3 15:40 <br>
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* @Author: <a href="4345453@kidgrow.com">liuke</a>
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*/
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public class DateUtil {
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// ---------------------- format parse ----------------------
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private static Logger logger = LoggerFactory.getLogger(DateUtil.class);
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private static final String DATE_FORMAT = "yyyy-MM-dd";
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private static final String DATETIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
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public static final String DATETIME_FORMAT_YYYYMMDDHHMMSS = "yyyyMMddHHmmss";
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private static ThreadLocal<Map<String, DateFormat>> dateFormatThreadLocal = new ThreadLocal<Map<String, DateFormat>>();
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private static DateFormat getDateFormat(String pattern) {
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if (pattern==null || pattern.trim().length()==0) {
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throw new IllegalArgumentException("pattern cannot be empty.");
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}
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Map<String, DateFormat> dateFormatMap = dateFormatThreadLocal.get();
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if(dateFormatMap!=null && dateFormatMap.containsKey(pattern)){
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return dateFormatMap.get(pattern);
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}
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synchronized (dateFormatThreadLocal) {
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if (dateFormatMap == null) {
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dateFormatMap = new HashMap<String, DateFormat>();
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}
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dateFormatMap.put(pattern, new SimpleDateFormat(pattern));
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dateFormatThreadLocal.set(dateFormatMap);
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}
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return dateFormatMap.get(pattern);
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}
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/**
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* format datetime. like "yyyy-MM-dd"
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*
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* @param date
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* @return
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* @throws ParseException
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*/
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public static String formatDate(Date date) {
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return format(date, DATE_FORMAT);
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}
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/**
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* format date. like "yyyy-MM-dd HH:mm:ss"
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*
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* @param date
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* @return
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* @throws ParseException
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*/
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public static String formatDateTime(Date date) {
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return format(date, DATETIME_FORMAT);
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}
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/**
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* format date
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*
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* @param date
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* @param patten
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* @return
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* @throws ParseException
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*/
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public static String format(Date date, String patten) {
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return getDateFormat(patten).format(date);
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}
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/**
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* parse date string, like "yyyy-MM-dd HH:mm:s"
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*
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* @param dateString
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* @return
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* @throws ParseException
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*/
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public static Date parseDate(String dateString){
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return parse(dateString, DATE_FORMAT);
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}
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/**
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* parse datetime string, like "yyyy-MM-dd HH:mm:ss"
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*
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* @param dateString
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* @return
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* @throws ParseException
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*/
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public static Date parseDateTime(String dateString) {
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return parse(dateString, DATETIME_FORMAT);
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}
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/**
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* parse date
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*
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* @param dateString
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* @param pattern
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* @return
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* @throws ParseException
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*/
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public static Date parse(String dateString, String pattern) {
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try {
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Date date = getDateFormat(pattern).parse(dateString);
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return date;
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} catch (Exception e) {
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logger.warn("parse date error, dateString = {}, pattern={}; errorMsg = ", dateString, pattern, e.getMessage());
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return null;
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}
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}
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// ---------------------- add date ----------------------
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public static Date addDays(final Date date, final int amount) {
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return add(date, Calendar.DAY_OF_MONTH, amount);
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}
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public static Date addYears(final Date date, final int amount) {
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return add(date, Calendar.YEAR, amount);
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}
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public static Date addMonths(final Date date, final int amount) {
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return add(date, Calendar.MONTH, amount);
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}
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public static Date addMinute(final Date date, final int amount) { return add(date, Calendar.MINUTE, amount); }
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private static Date add(final Date date, final int calendarField, final int amount) {
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if (date == null) {
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return null;
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}
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final Calendar c = Calendar.getInstance();
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c.setTime(date);
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c.add(calendarField, amount);
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return c.getTime();
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}
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}
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