java中日期转换Date、DateTime、TimeStamp、String之间相互转换

1.Date转String

1.1Date->String

        //date->String        Date date = new Date();        String format = dateFormat.format(date);        System.out.println("format = " + format);

1.2String->Date

        //yyyy-MM-dd HH:mm:ss        //SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        String time = "2023-04-03";        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");        //1.string->date        Date parse = dateFormat.parse(time);        System.out.println("parse = " + parse);

2.Date转TimeStamp

2.1Date->TimeStamp

        //Date->TimeStamp        Date date = new Date();        long time = date.getTime();        Timestamp createTime = new Timestamp(time);        System.out.println("createTime = " + createTime);

2.2TimeStamp->Date

        //TimeStamp->Date        Timestamp timestamp = new Timestamp(System.currentTimeMillis());        Date timestampToDate = new Date(timestamp.getTime());        System.out.println("timestampToDate = " + timestampToDate);

3.Date转DateTime

DateTime使用依赖

                    joda-time            joda-time            2.9.1        

3.1Date->DateTime

方法1：

        //method1        Date date = new Date();        DateTime dateTime1 = new DateTime(date);

方法2：

         //method2        Date date = new Date();        String dateTimeString = new DateTime(date).toString("yyyy-MM-dd");        DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern("yyyy-MM-dd");        DateTime time = dateTimeFormatter.parseDateTime(dateTimeString);        System.out.println("Date->DateTime: " + time);

3.2DateTime->Date

        //DateTime->Date        DateTime dateTime = new DateTime();        Date dateToDateTime = dateTime.toDate();        System.out.println("DateTime->Date" + dateToDateTime);

4.String转DateTime

        //String->DateTime        String dateTimeString = "2023-04-08";        DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern("yyyy-MM-dd");        DateTime time = dateTimeFormatter.parseDateTime(dateTimeString);        System.out.println("String->DateTime: " + time);        //DateTime->String        DateTime dt=new DateTime();        String format="YYYY-MM-dd HH-mm-ss";        String str= dt.toString(format);        System.out.println("DateTime->String = " + str);

5.String与TimeStamp互转

         String timeStr = "2023-04-06 10:30:40";        //String -> Timestamp        Timestamp time = Timestamp.valueOf(timeStr);        //Timestamp -> String        String strn = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(time);        System.out.println("Timestamp time = " + time);        System.out.println("strn = " + strn);

来源地址：https://blog.csdn.net/m0_64887997/article/details/130031520