java生成当前时间

Ⅰ java中获得当前时间(yyyy-mm-dd)

public static String getSystemTime()
{
return new SimpleDateFormat("yyyy-MM-dd").format(new Date(System.currentTimeMillis()));
}
这个方法就可以得到, 静态的, 用类名.方法名.

Ⅱ JAVA中获取系统当前时间该怎么写

一. 获取当前系统时间和日期并格式化输出:x0dx0ax0dx0aimport java.util.Date; x0dx0aimport java.text.SimpleDateFormat;x0dx0ax0dx0apublic class NowString { x0dx0a public static void main(String[] args) { x0dx0a SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式x0dx0a System.out.println(df.format(new Date()));// new Date()为获取当前系统时间x0dx0a } x0dx0a} x0dx0ax0dx0a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：x0dx0ax0dx0a1、用convert()转化函数：x0dx0ax0dx0aString sqlst = "select convert(varchar(10),bookDate,126) as convertBookDate from roomBook where bookDate between 񟭇-4-10' and 񟭇-4-25'";x0dx0ax0dx0aSystem.out.println(rs.getString("convertBookDate")); x0dx0ax0dx0a2、利用SimpleDateFormat类：x0dx0ax0dx0a先要输入两个java包：x0dx0ax0dx0aimport java.util.Date; x0dx0aimport java.text.SimpleDateFormat;x0dx0ax0dx0a然后：x0dx0ax0dx0a定义日期格式：SimpleDateFormat sdf = new SimpleDateFormat(yy-MM-dd);x0dx0ax0dx0asql语句为：String sqlStr = "select bookDate from roomBook where bookDate between 񟭇-4-10' and 񟭇-4-25'";x0dx0ax0dx0a输出：x0dx0ax0dx0aSystem.out.println(df.format(rs.getDate("bookDate")));

Ⅲ java怎么获取当前时间

/**
* 获取系统当前时间 <br>
* 方 法 名：getCurrentDate<br>
*
* @param formatStr
* 需要格式的目标字符串例:yyyy-MM-dd
* @return Date 时间对象
*/
publicstatic Date getCurrentDate() {
returnnew Date();
}

publicString getTodayString() {
Calendarca = Calendar.getInstance();
StringcurrDate = ca.get(Calendar.YEAR) + "-"
+(ca.get(Calendar.MONTH) + 1) + "-"
+ca.get(Calendar.DAY_OF_MONTH);
intweek = ca.get(Calendar.DAY_OF_WEEK);
Stringweekday = "";
if(week == 1) {
weekday= "星期天";
}else if (week == 2) {
weekday= "星期一";
}else if (week == 3) {
weekday= "星期二";
}else if (week == 4) {
weekday= "星期三";
}else if (week == 5) {
weekday= "星期四";
}else if (week == 6) {
weekday= "星期五";
}else if (week == 7) {
weekday= "星期六";
}
returncurrDate + " " + weekday;
}

Ⅳ java 获取本机当前时间并对小时任意加减

代码如下：

importjava.text.SimpleDateFormat;

importjava.util.Calendar;

importjava.util.Date;

publicclassDateTestUtil{

publicstaticvoidmain(String[]args)throwsException{

SimpleDateFormatsdf=newSimpleDateFormat("yyyyMMdd");

Stringstr="20110823";

Datedt=sdf.parse(str);

CalendarrightNow=Calendar.getInstance();

rightNow.setTime(dt);

rightNow.add(Calendar.YEAR,-1);//日期减1年

rightNow.add(Calendar.MONTH,3);//日期加3个月

rightNow.add(Calendar.DAY_OF_YEAR,10);//日期加10天

Datedt1=rightNow.getTime();

StringreStr=sdf.format(dt1);

System.out.println(reStr);

}

}

注：尘山竖在Calendar对象派大的add方法中，第二个参数为正数表示“加”，负数表示“减”。