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
}
}
设置时间，推荐 使用java.util.Calendar类来进行操作，
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)
}
}
展现date的时候调用的是java.util.Date中的toString()方法，你上面显示的是他默认的显示方法，你可以重写他的toString方法，也可以加一个样式，将时间改成这个样子yyyy-MM-dd hh-mm-ssURL u = new URL(frontURL)
HttpURLConnection http = (HttpURLConnection) u.openConnection()
http.setRequestMethod("HEAD")
Date lastModify =new Date(http.getLastModified())
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss")
String date = sdf.format(lastModify)
System.out.println(u+"最后更新时间："+ date)
Timer timeAction = new Timer(1000, new ActionListener() {public void actionPerformed(ActionEvent e) { }设置1s执行一次 将值放到session中就可以了
