java8中时间的互相转换(LocalDateTime)

野性酷女 2024-04-07 14:17 97阅读 0赞

## 1.将LocalDateTime转为自定义的时间格式的字符串 ##

//localDateTime 代表需要转换的时间；format代表自己定义的时间样式
    public static String getDateTimeAsString(LocalDateTime localDateTime, String format) {
        
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern(format);
        return localDateTime.format(formatter);
    }

## 2.将long类型的timestamp转为LocalDateTime ##

// timestamp可以通过long l = System.currentTimeMillis();这种方式去获取到，当然也可以通过其他的方式获取
    public static LocalDateTime getDateTimeOfTimestamp(long timestamp) {
        
        Instant instant = Instant.ofEpochMilli(timestamp);
        ZoneId zone = ZoneId.systemDefault();
        return LocalDateTime.ofInstant(instant, zone);
    }

## 3.将LocalDateTime转为long类型的timestamp ##

public static long getTimestampOfDateTime(LocalDateTime localDateTime) {
        
        ZoneId zone = ZoneId.systemDefault();
        Instant instant = localDateTime.atZone(zone).toInstant();
        return instant.toEpochMilli();
    }

## 4.将某时间字符串转为自定义时间格式的LocalDateTime ##

// time 是需要被格式化的时间字符串
    // format 是自己定义的时间格式
    public static LocalDateTime parseStringToDateTime(String time, String format) {
        
        DateTimeFormatter df = DateTimeFormatter.ofPattern(format);
        return LocalDateTime.parse(time, df);
    }

## 5.时间戳转特定的时间格式 ##

// timestamp是时间戳，注意：所有的时间戳均为long类型
    // format是自己定义的时间格式
    public static String getDateTimeOfTimestamp(long timestamp, String format) {
        
    Instant instant = Instant.ofEpochMilli(timestamp);
    ZoneId zone = ZoneId.systemDefault();
    LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, zone);
    DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(format);
    return dateTimeFormatter.format(localDateTime);
    }

获取时间戳的方式：[https://blog.csdn.net/qq\_41774102/article/details/126759334csdn\_share\_tail=%7B%22type%22%3A%22blog%22%2C%22rType%22%3A%22article%22%2C%22rId%22%3A%22126759334%22%2C%22source%22%3A%22qq\_41774102%22%7D][https_blog.csdn.net_qq_41774102_article_details_126759334csdn_share_tail_7B_22type_22_3A_22blog_22_2C_22rType_22_3A_22article_22_2C_22rId_22_3A_22126759334_22_2C_22source_22_3A_22qq_41774102_22_7D]

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