java.sql.Timestamp丢失精度
Timestamp的构造函数Timestamp(long time) 会丢失纳秒部分的精度
需要重新补偿
Timestamp t1 = Timestamp.valueOf("2019-12-13 15:19:53.2202080");
Timestamp t2 = new Timestamp(1576250393220208000L / 1000000L);
t2.setNanos((int) (1576250393220208000L % 1000000000L));
java.sql.Timestamp类的使用
Timestamp 可以精确到小数秒 一般存储的格式：2016-12-18 11:05:36.531
Timestamp 可以获取当前时间，也可以把字符串装换成Timestamp类型
1. 获取当前时间
@Test
public void getCurrentTime(){
//第一种
Date date = new Date();
Timestamp currentTime1 = new Timestamp(date.getTime());
System.out.println("currentTime1:"+currentTime1);
//第二种
Timestamp currentTime2 = new Timestamp(System.currentTimeMillis());
System.out.println("currentTime2:"+currentTime2);
}2.String类型转换为Timestamp
@Test
public void stringConvertTimestamp(){
String timeStr = "2016-12-18 11:16:33.706";
Timestamp ts = Timestamp.valueOf(timeStr);
System.out.println(ts);
}3.Timestamp转换为String类型
@Test
public void timestampConvertString(){
SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd HH:mm:ss");
Timestamp currentTime = new Timestamp(System.currentTimeMillis());
String timeStr = sdf.format(currentTime);
System.out.println(timeStr);
}整个演示类的代码：
package com.demo;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.junit.Test;
public class DemoTimestamp {
@Test
public void getCurrentTime(){
//第一种
Date date = new Date();
Timestamp currentTime1 = new Timestamp(date.getTime());
System.out.println("currentTime1:"+currentTime1);
//第二种
Timestamp currentTime2 = new Timestamp(System.currentTimeMillis());
System.out.println("currentTime2:"+currentTime2);
}
@Test
public void stringConvertTimestamp(){
String timeStr = "2016-12-18 11:16:33.706";
Timestamp ts = Timestamp.valueOf(timeStr);
System.out.println(ts);
}
@Test
public void timestampConvertString(){
SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd HH:mm:ss");
Timestamp currentTime = new Timestamp(System.currentTimeMillis());
String timeStr = sdf.format(currentTime);
System.out.println(timeStr);
}
}以上为个人经验，希望能给大家一个参考，也希望大家多多支持编程网。
