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Java中時(shí)間戳和時(shí)間的轉(zhuǎn)換方法代碼

更新時(shí)間：2025年03月25日 08:28:44 作者：思思文

這篇文章主要介紹了Java中時(shí)間戳和時(shí)間的轉(zhuǎn)換的相關(guān)資料,Java8中時(shí)間戳與日期時(shí)間對(duì)象之間的轉(zhuǎn)換是編程中常見的操作,通過(guò)時(shí)間字符串獲取時(shí)間對(duì)象也是其中的一種方法,需要的朋友可以參考下

前言

不論是什么編程語(yǔ)言，無(wú)論是剛開始學(xué)習(xí)，還是做了多長(zhǎng)時(shí)間的猿，都離不開時(shí)間戳和時(shí)間的轉(zhuǎn)換。Java中也是這樣，現(xiàn)在接觸到最低的java版本是Java8.其中的時(shí)間

獲取時(shí)間戳

//使用系統(tǒng)時(shí)間戳
long timestamp = System.currentTimeMillis();
System.out.println("timestamp:" + timestamp);
//>>timestamp:1733907943319

Long timestamp1 = Instant.now().toEpochMilli();
System.out.println("timestamp1:"+timestamp1);
//>>1733908000856

//獲取秒級(jí)時(shí)間戳
long timestamp2 = System.currentTimeMillis() / 1000;
System.out.println("timestamp2:"+timestamp2);
//>>1733908113

long timestamp3 = Instant.now().getEpochSecond();
System.out.println("timestamp3:"+timestamp3);
//>>1733908113

日期時(shí)間對(duì)象轉(zhuǎn)時(shí)間戳

LocalDateTime localDateTime = LocalDateTime.now();
System.out.println("localDateTime:"+localDateTime);
//>>localDateTime:2024-12-11T17:10:45.800
//獲取我們常見的時(shí)間格式
String dateTime = localDateTime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
System.out.println("dateTime:"+dateTime);
//>>dateTime:2023-04-07 14:06:53
//localDateTime獲取時(shí)間戳
long timestamp4 = localDateTime.toInstant(ZoneOffset.of("+8")).toEpochMilli();
System.out.println("timestamp4:"+timestamp4);
//>>1733908245800
long timestamp5 = localDateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
System.out.println("timestamp5:"+timestamp5);
//>> 1733908324740
long timestamp6 = ZonedDateTime.now().toInstant().toEpochMilli();
System.out.println("timestamp6:"+timestamp6);
//>>1733908374866
long timestamp7 = ZonedDateTime.now().toEpochSecond();
System.out.println("timestamp7:"+timestamp7);
//>>1733908374
long timestamp8 = ZonedDateTime.now().toLocalDateTime().toEpochSecond(ZoneOffset.of("+8"));
System.out.println("timestamp8:"+timestamp8);

時(shí)間戳轉(zhuǎn)時(shí)間對(duì)象

long time = System.currentTimeMillis();
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
 System.out.println("time:"+time);
 // 將毫秒時(shí)間戳轉(zhuǎn)換為 Instant 對(duì)象
Instant instant=Instant.ofEpochMilli(time);
System.out.println("instant:"+instant);
 // 將 Instant 對(duì)象轉(zhuǎn)換為 LocalDateTime 對(duì)象，使用系統(tǒng)默認(rèn)時(shí)區(qū)
LocalDateTime localDateTime=LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
System.out.println("localDateTime:"+localDateTime.format(formatter));
LocalDateTime localDateTime1 =LocalDateTime.ofEpochSecond(instant.getEpochSecond(),0, ZoneOffset.of("+8"));
System.out.println("localDateTime1:"+localDateTime1.format(formatter));

通過(guò)時(shí)間字符串獲取時(shí)間對(duì)象

String dt = "2024-12-11";
String dtt = "2024-12-11 17:44:28";
String format_DateTime = "yyyy-MM-dd HH:mm:ss";
DateTimeFormatter df = DateTimeFormatter.ofPattern(format_DateTime);
LocalDateTime localDateTime = LocalDateTime.parse(dtt, df);
System.out.println("localDateTime:"+localDateTime);
//轉(zhuǎn)為Instant
Instant instant = localDateTime.toInstant(ZoneOffset.of("+8"));
System.out.println("instant:"+instant);
System.out.println("毫秒級(jí)時(shí)間戳:"+instant.toEpochMilli());
System.out.println("秒級(jí)時(shí)間戳:"+instant.getEpochSecond());
LocalDate localDate = LocalDate.parse(dt);
System.out.println("localDate:"+localDate);
System.out.println("localDate.atStartOfDay():"+localDate.atStartOfDay().format(df));
//轉(zhuǎn)為Instant
Instant instant1 = localDate.atStartOfDay().toInstant(ZoneOffset.of("+8"));
System.out.println("毫秒級(jí)時(shí)間戳:"+instant.toEpochMilli());
System.out.println("秒級(jí)時(shí)間戳:"+instant.getEpochSecond());

以上就是java8中獲取時(shí)間戳以及通過(guò)實(shí)踐對(duì)象獲取時(shí)間戳和通過(guò)時(shí)間戳獲取時(shí)間對(duì)象。

總結(jié)

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