Java中字符串与日期转换

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);

2.1Date->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);

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);

    //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);

     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/weixin_48088839/article/details/131177587