Java 8 –如何格式化LocalDateTime

电玩女神 2023-02-15 05:19 11阅读 0赞

很少有示例向您展示如何在Java 8中格式化`java.time.LocalDateTime` 。

## 1. LocalDateTime + DateTimeFormatter ##

要格式化LocalDateTime对象，请使用`DateTimeFormatter`

TestDate1.java

package com.mkyong.time;
    
    import java.time.LocalDateTime;
    import java.time.format.DateTimeFormatter;
    
    public class TestDate1 {
        public static void main(String[] args) {
    
            //Get current date time
            LocalDateTime now = LocalDateTime.now();
    
            System.out.println("Before : " + now);
    
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
    
            String formatDateTime = now.format(formatter);
    
            System.out.println("After : " + formatDateTime);
          
        }
    }

输出量

Before : 2016-11-09T11:44:44.797
    
    After  : 2016-11-09 11:44:44

## 2.字符串-> LocalDateTime ##

将字符串转换为`LocalDateTime`另一个示例

TestDate2.java

package com.mkyong.time;
    
    import java.time.LocalDateTime;
    import java.time.format.DateTimeFormatter;
    
    public class TestDate2 {
        public static void main(String[] args) {
    
            String now = "2016-11-09 10:30";
    
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
    
            LocalDateTime formatDateTime = LocalDateTime.parse(now, formatter);
    
            System.out.println("Before : " + now);
    
            System.out.println("After : " + formatDateTime);
    
            System.out.println("After : " + formatDateTime.format(formatter));
    
        }
    }

输出量

Before : 2016-11-09 10:30
    
    After : 2016-11-09T10:30
    
    After : 2016-11-09 10:30

## 参考文献 ##

1.  [DateTimeFormatter JavaDoc][]
2.  [Java 8 –如何将字符串转换为LocalDate][Java 8 _LocalDate]

标签： [日期][Link 1] [格式][Link 2] [java.time][] [java8][] [localdatetime][]

> 翻译自: [https://mkyong.com/java8/java-8-how-to-format-localdatetime/][https_mkyong.com_java8_java-8-how-to-format-localdatetime]

[DateTimeFormatter JavaDoc]: https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html
[Java 8 _LocalDate]: http://www.mkyong.com/java8/java-8-how-to-convert-string-to-localdate/
[Link 1]: https://mkyong.com/tag/date/
[Link 2]: https://mkyong.com/tag/format/
[java.time]: https://mkyong.com/tag/java-time/
[java8]: https://mkyong.com/tag/java8/
[localdatetime]: https://mkyong.com/tag/localdatetime/
[https_mkyong.com_java8_java-8-how-to-format-localdatetime]: https://mkyong.com/java8/java-8-how-to-format-localdatetime/