两者关系

sql包中Date是util包子类

java 复制代码

public class Date extends java.util.Date

两者在时间显示上区别

java 复制代码

    /**
     * 解决sql包中日期和util包日期转换问题
     */
    @Test
    public 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 - $2023-08-06 21:59:40.736$