文章目录
- Date自定义返回格式
- 通过重写get方法
- 注解方式
- LocalDateTime自定义返回
- 重写get
- 注解
Date自定义返回格式
Date 默认返回的格式可能不是我们想要的格式.我们可以手动指定返回格式.
通过重写get方法
java标准库为我们提供了自定义格式的类,可以在jdk文档中输入SimpleDateFormat找到
| Letter | Date or Time Component | Presentation | Examples |
|---|---|---|---|
| G | Era designator | Text | AD |
| y | Year | Year | 1996; 96 |
| Y | Week year | Year | 2009; 09 |
| M | Month in year (context sensitive) | Month | July; Jul; 07 |
| L | Month in year (standalone form) | Month | July; Jul; 07 |
| w | Week in year | Number | 27 |
| W | Week in month | Number | 2 |
| D | Day in year | Number | 189 |
| d | Day in month | Number | 10 |
| F | Day of week in month | Number | 2 |
| E | Day name in week | Text | Tuesday; Tue |
| u | Day number of week (1 = Monday, …, 7 = Sunday) | Number | 1 |
| a | Am/pm marker | Text | PM |
| H | Hour in day (0-23) | Number | 0 |
| k | Hour in day (1-24) | Number | 24 |
| K | Hour in am/pm (0-11) | Number | 0 |
| h | Hour in am/pm (1-12) | Number | 12 |
| m | Minute in hour | Number | 30 |
| s | Second in minute | Number | 55 |
| S | Millisecond | Number | 978 |
| z | Time zone | General time zone | Pacific Standard Time; PST; GMT-08:00 |
| Z | Time zone | RFC 822 time zone | -0800 |
| X | Time zone | ISO 8601 time zone | -08; -0800; -08:00 |
- 自定义一个类,在方法内部写入需要改的格式,然后返回这个格式,返回的是String类型!
publicclassDateUtils{publicstaticStringdateFormat(Datedate){SimpleDateFormatsimpleDateFormat=newSimpleDateFormat("yyyy-MM-dd HH:mm:ss");returnsimpleDateFormat.format(date);}}- 重写get方法
privateDatecreateTime;publicStringgetCreateTime(){returnDateUtils.dateFormat(createTime);}注解方式
如果是web程序一般不需要导入依赖
@JsonFormat(pattern="yyyy-MM-dd HH:mm:ss")privateDatecreateTime;如果没有找到注解,尝试导入依赖
<dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId></dependency>LocalDateTime自定义返回
LocatDateTime的时间是指定一个地区的,Date是不带时区的
重写get
SimpleDateFormatsdf=newSimpleDateFormat("EEE MMM dd HH:mm:ss zzz yyyy",Locale.ENGLISH);注解
@JsonFormat(pattern="yyyy-MM-dd HH:mm:ss",locale="zh_CN")privateLocalDateTimecreateTime;
