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 3889 字，大约阅读时间需要 12 分钟。

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 处理日期工具，适用于java8新的日期和时间 * @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<>();    /**     * format LocalDate, yyyy-MM-dd     *     * @param localDateTime     * @return     */    public static String formatDate(LocalDateTime localDateTime) {           return format(localDateTime, DATE_FORMAT);    }    /**     * format LocalDate, yyyy-MM-dd     *     * @param localDate     * @return     */    public static String formatDate(LocalDate localDate) {           return format(localDate, DATE_FORMAT);    }    /**     * format formatDateTime, yyyy-MM-dd HH:mm:ss     *     * @param localDateTime     * @return     */    public static String formatDateTime(LocalDateTime localDateTime) {           return format(localDateTime, DATETIME_FORMAT);    }    /**     * format date     *     * @param localDateTime     * @param pattern     * @return     */    public static String format(LocalDateTime localDateTime, String pattern) {           if (localDateTime == null) {               throw new IllegalArgumentException("date can't be null");        }        return localDateTime.format(getDateFormat(pattern));    }    /**     * format date     *     * @param localDate     * @param pattern     * @return     */    public static String format(LocalDate localDate, String pattern) {           if (localDate == null) {               throw new IllegalArgumentException("date can't be null");        }        return localDate.format(getDateFormat(pattern));    }    /**     * parse date,yyyy-MM-dd     *     * @param dateStr     * @return     */    public static LocalDate parseDate(String dateStr) {           return parseDate(dateStr, DATE_FORMAT);    }    /**     * parse Date, yyyy-MM-dd HH:mm:ss     *     * @param dateStr     * @return     */    public static LocalDateTime parseDateTime(String dateStr) {           return parseDateTime(dateStr, DATETIME_FORMAT);    }    /**     * parse date     *     * @param dateStr     * @param pattern     * @return     */    public static LocalDateTime parseDateTime(String dateStr, String pattern) {           return LocalDateTime.parse(dateStr, getDateFormat(pattern));    }    /**     * parse date     *     * @param dateStr     * @param pattern     * @return     */    public static LocalDate parseDate(String dateStr, String pattern) {           return LocalDate.parse(dateStr, getDateFormat(pattern));    }    /**     * 同个线程，可以避免创建很多个DateFormat.     *     * @param pattern     * @return     */    private static DateTimeFormatter getDateFormat(String pattern) {           // 校验入参        if (StringUtils.isBlank(pattern)) {               throw new IllegalArgumentException("pattern can't be empty");        }        // 获取DateFormat        Map
     
       dateFormatMap = dateThreadLocal.get();        if (dateFormatMap != null && dateFormatMap.containsKey(pattern)) {               return dateFormatMap.get(pattern);        }        synchronized (dateThreadLocal) {               if (dateFormatMap == null) {                   dateFormatMap = new HashMap<>();            }            dateFormatMap.put(pattern, DateTimeFormatter.ofPattern(pattern));            dateThreadLocal.set(dateFormatMap);        }        return dateFormatMap.get(pattern);    }}

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