java如何获取当前系统时间需要用Date型的

Calendar c=CalendargetInstance();

int y=cget(CalendarYEAR);

int m=cget(CalendarMONTH);

int d=cget(CalendarDATE);String date=y+"-"+m+"-"+d; Date d=javasqlDatevalueOf(time);

首先获取当前时间：

javautilDate nowdate = new javautilDate();

2/2

然后如果你想时间的格式和你想用的时间格式一致 那么就要格式化时间了SimpleDateFormat 的包在javatext包下SimpleDateFormat

sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss") //年月日 时分秒

String t = sdfparse（nowdate）；

public static String getSysYear() {

Calendar date = CalendargetInstance();

String year = StringvalueOf(dateget(CalendarYEAR));

return year;

}

扩展资料：

获取当前系统时间和日期并格式化输出:

import javautilDate;

import javatextSimpleDateFormat;

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

Systemoutprintln(dfformat(new Date()));// new Date()为获取当前系统时间

}

}

//如何获得系统日期，并把其转化为 String

import javautilDate;

import javatext;

public class StrDate{

public static void main(String[] args){

Date d = new Date();

//String str = dtoString();

SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd kk:mm:ss ");//其中yyyy-MM-dd是你要表示的格式

//可以任意组合，不限个数和次序；具体表示为：MM-month,dd-day,yyyy-year;kk-hour,mm-minute,ss-second;

String str=sdfformat(d);

Systemoutprintln("The date is : " str);

}

}

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

sdfformat(new Date());

得到的日期格式为：2008-05-14

不知道是不是你要的！你可以根据需要设置格式化类型("yyyy-MM-dd");

这个是我以前自己做的，你看看吧，希望对你有帮助

//导入包

import javaxswing;

import javautil;

import javaapplet;

import javaawt;

import javaawteventWindowAdapter;

import javaawteventWindowEvent;

import javatext;

public class MyClock extends Applet implements Runnable

{

private volatile Thread timer;

//定义变量

private int lastxs,lastys,lastxm,lastym,lastxh,lastyh;

private SimpleDateFormat formatter;

private String lastdate;

private Font clockFaceFont;

private Date currentDate;

private Color handColor;

private Color numberColor;

private int xcenter=80,ycenter=55;

public void init(){

int x,y;

lastxs=lastys=lastxm=lastym=lastxh=lastyh=0;

formatter=new SimpleDateFormat("EEE MMM dd hh:ss yyyy",LocalegetDefault());//设置时间格式

currentDate=new Date();//获取时间

lastdate=formatterformat(currentDate);

clockFaceFont=new Font("Serif",FontPLAIN,14);

handColor=ColorBLUE;

numberColor=ColordarkGray;

try{

setBackground(new Color(IntegerparseInt(getParameter("bgcolor"),16)));

}catch(NullPointerException e){

}catch(NumberFormatException e){

}

try{

handColor=new Color(IntegerparseInt(getParameter("fgcolor1"),16));

}catch(NullPointerException e){

}catch(NumberFormatException e){

}

try{

numberColor=new Color(IntegerparseInt(getParameter("fgcolor2"),16));

}catch(NullPointerException e){

}catch(NumberFormatException e){

}

resize(300,300);

}

public void update(Graphics g){

int xh,yh,xm,ym,xs,ys;

int s=0,m=10,h=10;

String today;

currentDate=new Date();

formatterapplyPattern("s");

try{

s=IntegerparseInt(formatterformat(currentDate));

}catch(NumberFormatException n){

s=0;

}

formatterapplyPattern("m");

try{

m=IntegerparseInt(formatterformat(currentDate));

}catch(NumberFormatException n){

m=10;

}

formatterapplyPattern("h");

try{

h=IntegerparseInt(formatterformat(currentDate));

}catch(NumberFormatException n){

h=10;

}

xs=(int)(Mathcos(sMathPI/30-MathPI/2)45+xcenter);

ys=(int)(Mathsin(sMathPI/30-MathPI/2)45+ycenter);

xm=(int)(Mathcos(mMathPI/30-MathPI/2)40+xcenter);

ym=(int)(Mathsin(mMathPI/30-MathPI/2)40+ycenter);

xh=(int)(Mathcos((h30+m/2)MathPI/180-MathPI/2)30+xcenter);

yh=(int)(Mathsin((h30+m/2)MathPI/180-MathPI/2)30+ycenter);

//获取在底部显示的日期

formatterapplyPattern("EEE MMM dd HH: mm:ss yyyy");

today=formatterformat(currentDate);

gsetFont(clockFaceFont);

gsetColor(getBackground());

if(xs!=lastxs||ys!=lastys)

{

gdrawLine(xcenter,ycenter,lastxs,lastys);

gdrawString(lastdate,5,125);

}

if(xm!=lastxm||ym!=lastym)

{

gdrawLine(xcenter,ycenter-1,lastxm,lastym);

gdrawLine(xcenter-1,ycenter,lastxm,lastym);

}

if(xh!=lastxh||yh!=lastyh)

{

gdrawLine(xcenter,ycenter-1,lastxh,lastyh);

gdrawLine(xcenter-1,ycenter,lastxh,lastyh);

}

gsetColor(numberColor);

gdrawString(today,5,125);

gdrawLine(xcenter,ycenter,xs,ys);

gsetColor(handColor);

gdrawLine(xcenter,ycenter-1,xm,ym);

gdrawLine(xcenter-1,ycenter,xm,ym);

gdrawLine(xcenter,ycenter-1,xh,yh);

gdrawLine(xcenter-1,ycenter,xh,yh);

lastxs=xs;lastys=ys;

lastxm=xh;lastym=ym;

lastdate=today;

}

public void paint(Graphics g){

gsetFont(clockFaceFont);

gsetColor(handColor);

gdrawArc(xcenter-50,ycenter-50,100,100,0,360);

gsetColor(numberColor);

gdrawString("9",xcenter-45,ycenter+3);

gdrawString("3",xcenter+40,ycenter+3);

gdrawString("12",xcenter-5,ycenter-37);

gdrawString("6",xcenter-3,ycenter+45);

gsetColor(numberColor);

gdrawString(lastdate,5,125);

gdrawLine(xcenter,ycenter,lastxs,lastys);

gsetColor(handColor);

gdrawLine(xcenter,ycenter-1,lastxm,lastym);

gdrawLine(xcenter-1,ycenter,lastxm,lastym);

gdrawLine(xcenter,ycenter-1,lastxh,lastyh);

gdrawLine(xcenter-1,ycenter,lastxh,lastyh);

}

public void start(){

timer=new Thread(this);

timerstart();

}

public void stop(){

timer=null;

}

public void run() {

//To change body of implemented methods use File | Settings | File Templates

Thread me=ThreadcurrentThread();

while(timer==me){

try{

ThreadcurrentThread()sleep(100);

}catch(InterruptedException e){

}

repaint();

}

}

public static void main(String[] args) {

JFrame f=new JFrame("显示时钟");

fsetSize(200,180);

MyClock mc=new MyClock();

mcinit();

mcstart();

fadd(mc);

/ faddWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e){

Systemexit(0);

}

});/

fsetDefaultCloseOperation(3);

fshow();

}

}

now=new Date;

year=nowgetFullYear();

month=nowgetMonth()+1;

day=nowgetDate();

hour=nowgetHours();

minute=nowgetMinutes();

second=nowgetSeconds();

ms=nowgetMilliseconds();

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