java 日期转换工具类-蒲公英云

java 日期转换工具类

引入的jar文件

<dependency>
      <groupId>joda-time</groupId>
      <artifactId>joda-time</artifactId>
      <version>2.3</version>
    </dependency>

代码块: DateTimeUtil.java

package com.example.demo.util;
import org.apache.commons.lang3.StringUtils;
import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import java.util.Date;
/** * @description: 时间转换工具类 * @create: 2020/03/15 10:49 **/
public class DateTimeUtil { 
    public static final String STANDARD_FORMAT = "yyyy-MM-dd HH:mm:ss";
    /** * str->Date 如：2020-03-15 10:55:09 -> Sun Mar 15 10:55:09 CST 2020 * @param dateTimeStr * @param formatStr * @return */
    public static Date strToDate(String dateTimeStr,String formatStr){ 
        DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern(formatStr);
        DateTime dateTime = dateTimeFormatter.parseDateTime(dateTimeStr);
        return dateTime.toDate();
    }
    /** * date->str 如：new Date() -> 2020-03-15 10:56:08 * @param date * @param formatStr * @return */
    public static String dateToStr(Date date,String formatStr){ 
        if(date == null){ 
            return StringUtils.EMPTY;
        }
        DateTime dateTime = new DateTime(date);
        return dateTime.toString(formatStr);
    }
    /** * strToDate(String dateTimeStr) 是对上面写的strToDate(String dateTimeStr,String formatStr)的包装, * 即默认使用"yyyy-MM-dd HH:mm:ss"格式 * * @param dateTimeStr * @return */
    public static Date strToDate(String dateTimeStr){ 
        DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern(STANDARD_FORMAT);
        DateTime dateTime = dateTimeFormatter.parseDateTime(dateTimeStr);
        return dateTime.toDate();
    }
    /** * dateToStr(Date date) 是对上面写的dateToStr(Date date,String formatStr)的包装, * 即默认使用"yyyy-MM-dd HH:mm:ss"格式 * * @param date * @return */
    public static String dateToStr(Date date){ 
        if(date == null){ 
            return StringUtils.EMPTY;
        }
        DateTime dateTime = new DateTime(date);
        return dateTime.toString(STANDARD_FORMAT);
    }
    public static void main(String[] args) { 
        System.out.println(DateTimeUtil.dateToStr(new Date(),"yyyy-MM-dd HH:mm:ss"));
        System.out.println(DateTimeUtil.strToDate("2020-03-15 10:55:09","yyyy-MM-dd HH:mm:ss"));
    }
}