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Java中時間戳和時間的轉(zhuǎn)換方法代碼

更新時間：2025年03月25日 08:28:44 作者：思思文

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

前言

不論是什么編程語言，無論是剛開始學習，還是做了多長時間的猿，都離不開時間戳和時間的轉(zhuǎn)換。Java中也是這樣，現(xiàn)在接觸到最低的java版本是Java8.其中的時間

獲取時間戳

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

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

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

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

日期時間對象轉(zhuǎn)時間戳

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);

時間戳轉(zhuǎn)時間對象

long time = System.currentTimeMillis();
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
 System.out.println("time:"+time);
 // 將毫秒時間戳轉(zhuǎn)換為 Instant 對象
Instant instant=Instant.ofEpochMilli(time);
System.out.println("instant:"+instant);
 // 將 Instant 對象轉(zhuǎn)換為 LocalDateTime 對象，使用系統(tǒng)默認時區(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));

通過時間字符串獲取時間對象

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("毫秒級時間戳:"+instant.toEpochMilli());
System.out.println("秒級時間戳:"+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("毫秒級時間戳:"+instant.toEpochMilli());
System.out.println("秒級時間戳:"+instant.getEpochSecond());

以上就是java8中獲取時間戳以及通過實踐對象獲取時間戳和通過時間戳獲取時間對象。