Java8日期格式化工具-白红宇

Java8日期格式化工具

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发布时间：2019-03-05

本文共 3372 字，大约阅读时间需要 11 分钟。

    Java 8 ??????? - DateUtil2    
       
       
       
           
    package com.freedom.demo.utils;import lombok.extern.slf4j.Slf4j;import org.apache.commons.lang3.StringUtils;import java.text.DateFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.time.LocalDate;import java.time.LocalDateTime;import java.time.format.DateTimeFormatter;import java.util.Calendar;import java.util.Date;import java.util.HashMap;import java.util.Map;/** * @author tobebetter9527 * @description ??????????Java8??????? * @create 2020/05/02 16:32 */@Slf4jpublic class DateUtil2 {    private DateUtil2() {    }    private static final String DATE_FORMAT = "yyyy-MM-dd";    private static final String DATETIME_FORMAT = "yyyy-MM-dd HH:mm:ss";    private static final ThreadLocal
      
       > dateThreadLocal = new ThreadLocal<>();    /**     * ??? LocalDate ? "yyyy-MM-dd" ??     * @param localDateTime     * @return ????????     */    public static String formatDate(LocalDateTime localDateTime) {        return format(localDateTime, DATE_FORMAT);    }    /**     * ??? LocalDate ? "yyyy-MM-dd" ??     * @param localDate     * @return ????????     */    public static String formatDate(LocalDate localDate) {        return format(localDate, DATE_FORMAT);    }    /**     * ??? LocalDateTime ? "yyyy-MM-dd HH:mm:ss" ??     * @param localDateTime     * @return ????????     */    public static String formatDateTime(LocalDateTime localDateTime) {        return format(localDateTime, DATETIME_FORMAT);    }    /**     * ??????????????     * @param localDateTime ??? LocalDateTime ? LocalDate ??     * @param pattern ?????     * @return ????????     */    public static String format(Object date, String pattern) {        if (date == null) {            throw new IllegalArgumentException("date can't be null");        }        return format((java.time.TemporalAccessor) date, pattern);    }    /**     * ??????????????     * @param dateStr ?????     * @param pattern ?????     * @return ???? LocalDate ? LocalDateTime ??     */    public static LocalDate parseDate(String dateStr, String pattern) {        return LocalDate.parse(dateStr, getDateFormat(pattern));    }    /**     * ??????????????     * @param dateStr ?????     * @param pattern ?????     * @return ???? LocalDateTime ??     */    public static LocalDateTime parseDateTime(String dateStr, String pattern) {        return LocalDateTime.parse(dateStr, getDateFormat(pattern));    }    /**     * ?? ThreadLocal ??? DateFormat ??     * @param pattern ?????     * @return DateFormat ??     */    private static DateTimeFormatter getDateFormat(String pattern) {        if (StringUtils.isBlank(pattern)) {            throw new IllegalArgumentException("pattern can't be empty");        }        Map
       
         dateFormatMap = dateThreadLocal.get();        if (dateFormatMap != null && dateFormatMap.containsKey(pattern)) {            return dateFormatMap.get(pattern);        }        synchronized (dateThreadLocal) {            if (dateFormatMap == null) {                dateFormatMap = new HashMap<>();                dateThreadLocal.set(dateFormatMap);            }            DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);            dateFormatMap.put(pattern, formatter);            dateThreadLocal.set(dateFormatMap);        }        return dateFormatMap.get(pattern);    }}