32 lines
860 B
Markdown
32 lines
860 B
Markdown
# 一些java常用的片段
|
||
|
||
## 更改java版本
|
||
|
||
我想用java17怎么办呢?
|
||
|
||
|
||
在plugin里面加这个,就可以了
|
||
|
||
```xml
|
||
<plugin>
|
||
<groupId>org.apache.maven.plugins</groupId>
|
||
<artifactId>maven-compiler-plugin</artifactId>
|
||
<version>3.8.1</version>
|
||
<configuration>
|
||
<source>17</source>
|
||
<target>17</target>
|
||
<encoding>utf-8</encoding>
|
||
</configuration>
|
||
</plugin>
|
||
```
|
||
|
||
## 时间转换
|
||
|
||
```java
|
||
1.Timestamp 转 LocalDateTime
|
||
Timestamp time = Timestamp.from(Instant.now());
|
||
LocalDateTime localDateTime = time.toLocalDateTime();
|
||
2.LocalDateTime 转 Timestamp
|
||
DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd");
|
||
Timestamp time = Timestamp.valueOf(LocalDateTime.now().format(dtf);
|
||
```
|