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JAVA中获取当前系统时间

Jun 06, 2016 pm 12:04 PM
javacodeOpen sourcesystemprogrammingprogramming languagesoftware development

一. 获取当前系统时间和日期并格式化输出:

import java.util.Date;
import java.text.SimpleDateFormat;

public class NowString {
public static void main(String[] args) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式
System.out.println(df.format(new Date()));// new Date()为获取当前系统时间
}
}

二. 在数据库里的日期只以年-月-日的方式输出,可以用下面两种方法:

1、用convert()转化函数:

String sqlst = "select convert(varchar(10),bookDate,126) as convertBookDate from roomBook where bookDate between '2007-4-10' and '2007-4-25'";

System.out.println(rs.getString("convertBookDate"));

2、利用SimpleDateFormat类:

先要输入两个java包:

import java.util.Date;
import java.text.SimpleDateFormat;

然后:

定义日期格式:SimpleDateFormat sdf = new SimpleDateFormat(yy-MM-dd);

sql语句为:String sqlStr = "select bookDate from roomBook where bookDate between '2007-4-10' and '2007-4-25'";

输出:

System.out.println(df.format(rs.getDate("bookDate")));

 

************************************************************

java中获取当前日期和时间的方法
 

import java.util.Date;
import java.util.Calendar;

import java.text.SimpleDateFormat;

public class TestDate{
public static void main(String[] args){
Date now = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");//可以方便地修改日期格式


String hehe = dateFormat.format( now );
System.out.println(hehe);

Calendar c = Calendar.getInstance();//可以对每个时间域单独修改

 


int year = c.get(Calendar.YEAR);
int month = c.get(Calendar.MONTH);
int date = c.get(Calendar.DATE);
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);
int second = c.get(Calendar.SECOND);
System.out.println(year + "/" + month + "/" + date + " " +hour + ":" +minute + ":" + second);
}
}

 有时候要把String类型的时间转换为Date类型,通过以下的方式,就可以将你刚得到的时间字符串转换为Date类型了。

SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");

java.util.Date time=null;
try {
   time= sdf.parse(sdf.format(new Date()));

} catch (ParseException e) {

   e.printStackTrace();
}

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