商标注册查询官网中国商标网/关键词优化需要从哪些方面开展

两者关系

sql包中Date是util包子类

public class Date extends java.util.Date 

两者在时间显示上区别

    /*** 解决sql包中日期和util包日期转换问题*/@Testpublic void t3(){Date utilDate = new Date();java.sql.Date sqlDate = new java.sql.Date(utilDate.getTime());Time time = new Time(utilDate.getTime());Timestamp timestamp = new Timestamp(utilDate.getTime());log.info("[{}]",utilDate);log.info("[{}]",sqlDate);log.info("[{}]",time);log.info("[{}]",timestamp);}

我们可以看到，java.util.Date类输出的时间包含年月日及时分秒，而java.sql.Date输出的时间仅有年月日。这是因为java.sql包下的Date仅表示日期，只有年月日，没有时分秒，因此会丢失时间。

21:59:40.745 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - [Sun Aug 06 21:59:40 CST 2023]
21:59:40.762 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - [2023-08-06]
21:59:40.762 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - [21:59:40]
21:59:40.762 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - [2023-08-06 21:59:40.736]