java 日期转换工具类

迈不过友情╰ 2023-07-15 02:54 34阅读 0赞

**引入的jar文件**

**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"));
        }
    }

**执行结果：**  
2020-03-15 10:56:08  
Sun Mar 15 10:55:09 CST 2020