date和localdatetime互相转换
时间: 2023-05-21 20:02:57 浏览: 58
可以使用Java 8中的DateTimeFormatter类来进行转换,具体代码如下:
//将LocalDateTime转换为Date
LocalDateTime localDateTime = LocalDateTime.now();
Date date = Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
//将Date转换为LocalDateTime
Date date = new Date();
LocalDateTime localDateTime = LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault());
相关问题
date,localdate,localdatetime,string 互相转转换
要进行date、localdate、localdatetime和string之间的相互转换,可以使用Java 8中的DateTimeFormatter和相关类来实现。
1. 将String转换为LocalDateTime:
使用DateTimeFormatter的ofPattern方法指定日期时间的格式,然后使用LocalDateTime的parse方法将String转换为LocalDateTime对象。例如:
```java
String dateStr = "2020-07-20 15:54:41";
String pattern = "yyyy-MM-dd HH:mm:ss";
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(pattern);
LocalDateTime localDateTime = LocalDateTime.parse(dateStr, dateTimeFormatter);
```
2. 将LocalDateTime转换为String:
使用DateTimeFormatter的ofPattern方法指定日期时间的格式,然后使用LocalDateTime的format方法将LocalDateTime对象转换为String。例如:
```java
LocalDateTime localDateTime = LocalDateTime.now();
String pattern = "yyyy-MM-dd HH:mm:ss";
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(pattern);
String dateStr = localDateTime.format(dateTimeFormatter);
```
3. 将String转换为LocalDate:
使用DateTimeFormatter的ofPattern方法指定日期的格式,然后使用LocalDate的parse方法将String转换为LocalDate对象。例如:
```java
String dateStr = "2021-06-15";
String pattern = "yyyy-MM-dd";
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(pattern);
LocalDate localDate = LocalDate.parse(dateStr, dateTimeFormatter);
```
4. 将LocalDate转换为String:
使用DateTimeFormatter的ofPattern方法指定日期的格式,然后使用LocalDate的format方法将LocalDate对象转换为String。例如:
```java
LocalDate localDate = LocalDate.now();
String pattern = "yyyy-MM-dd";
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(pattern);
String dateStr = localDate.format(dateTimeFormatter);
```
请注意,以上代码示例仅供参考,具体的实现方式可以根据实际需求进行调整。
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localdatetime转换成String
要LocalDateTime类型转换为String类型,可以使用DateTimeFormatter类的ofPattern方法指定日期格式,然后使用format方法将LocalDateTime对象格式化为字符串。以下是示例代码:
```java
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
public class Main {
public static void main(String[] args) {
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
LocalDateTime dateTime = LocalDateTime.now();
String dateString = dateTime.format(formatter);
System.out.println(dateString);
}
}
```
在这个示例中,我们创建了一个DateTimeFormatter对象,并使用ofPattern方法指定日期格式(例如"yyyy-MM-dd HH:mm:ss")。然后,我们获取当前的LocalDateTime对象,并使用format方法将其转换为字符串。最后,我们将字符串输出到控制台。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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