JAVA的String,Timestamp和Date数据类型之间的装换

小鱼儿 2022-05-05 08:30 173阅读 0赞

### String  ==>  Date ###

//String 转化为Date
            try {
                String dateStr = "2018/10/16 16:34:23";
               
                //注意format的格式要与日期String的格式相匹配
                DateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
                 Date date = sdf.parse(dateStr);
                System.out.println(date.toString());
            } catch (Exception e) {
                e.printStackTrace();
            }

### String  ==>  Timestamp ###

//String 转化为Timestamp
            //valueOf(String str)
            try {
                String tsStr = "2018-10-16 11:49:45";
                Timestamp ts = Timestamp.valueOf(tsStr);
                System.out.println(ts);
            } catch (Exception e) {
                e.printStackTrace();
            }

### Date  ==>  String ###

//Date 转化为String,通过SimpleDateFormat的format方法
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            String format = sdf.format(new Date());
            System.out.println(format);

### Date ==>  Timestamp ###

//Date 转化为Timestamp
            Date date = new Date();
            Timestamp timestamp = new Timestamp(date.getTime());
            System.out.println(timestamp);

### Timestamp  ==>  Date ###

//Timestamp 转化为Date
            Timestamp timestam= new Timestamp(System.currentTimeMillis());
            Date d = timestam;
            System.out.println(d.toString() + "==="+d);

### Timestamp  ==>  String ###

//Timestamp 转化为String
            Timestamp timesta = new Timestamp(System.currentTimeMillis());
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            String format1 = simpleDateFormat.format(timesta);
            System.out.println(format1);

SO,结果为:

![70][]

[70]: /images/20220505/09291d63a76145c2ae6af8b71b2b8d9d.png