「java增加时区」java 时间戳 时区

本篇文章给大家谈谈java增加时区，以及java 时间戳 时区对应的知识点，希望对各位有所帮助，不要忘了收藏本站喔。

本文目录一览：

• 1、java时间转换，带时区的
• 2、java时钟小程序中怎么添加时区换算功能
• 3、java中如何获取时区？

java时间转换，带时区的

我假设了你的已知时间类型为Calendar，如果不是你也可以自己改成Date类型，代码如下：

import java.text.DateFormat;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.TimeZone;

public class Test {

public static void main(String[] args) {

//假如这个是你已知的时间类型

Calendar cal = Calendar.getInstance();

cal.getTimeInMillis();

//北京时区GMT+8

Calendar beijingcal = Calendar.getInstance();

beijingcal.clear();

beijingcal.setTimeZone(TimeZone.getTimeZone("GMT+8"));

beijingcal.setTimeInMillis(cal.getTimeInMillis());

DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

String beijingFormatStr = fmt.format(beijingcal.getTime());

System.out.println(beijingFormatStr);

}

}

java时钟小程序中怎么添加时区换算功能

String times = request.getParameter("time"); ---------(从页面拿到的时间)

SimpleDateFormat time = new SimpleDateFormat("yyyy-mm-dd");--------(java.util.date)

Date date = time.parse(times);--------(把String转换成Date)

拿系统时间：格式由自己定义

Format format = new SimpleDateFormat("yyyy/MM/dd"); ---------(java.util.date) //"yyyy/mm/dd hh:mm:ss"

Date date = new Date(); -----------(java.util.date)

time = format.format(date) ------------tim为格式化后的时间

java中如何获取时区？

//我实现一个时钟窗口程序给你了，好让你更容易理解，希望对你有帮助。

import java.awt.*;

import java.awt.event.*;

import java.util.*;

//世界时钟

public class TimerTest {

public static void main(String[] args) {

new TimerTestFrame("世界时钟");

}

}

class TimerTestFrame extends Frame {

/**

*

*/

private static final long serialVersionUID = 1L;

public TimerTestFrame(String s) {

super(s);

addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {

dispose();

System.exit(0);

}

});

setLayout(new GridLayout(2, 6));

ClockCanvas clk1 = new ClockCanvas("北京", "GMT+8"); // 创建时钟

ClockCanvas clk2 = new ClockCanvas("巴黎", "GMT+2");

ClockCanvas clk3 = new ClockCanvas("华盛顿", "GMT-4");

ClockCanvas clk4 = new ClockCanvas("洛衫矶", "GMT-7");

ClockCanvas clk5 = new ClockCanvas("伦敦", "GMT+1");

ClockCanvas clk6 = new ClockCanvas("芝加哥", "GMT-5");

add(clk1);

add(clk2);

add(clk3);

add(clk4);

add(clk5);

add(clk6);

setSize(500, 350); // 设置框架宽高

setVisible(true);

}

}

class ClockCanvas extends Canvas implements Runnable {

/**

*

*/

private static final long serialVersionUID = 1L;

private int seconds = 0;

private String city;

private GregorianCalendar calendar;

Thread t;

public ClockCanvas(String c, String tz) {

city = c;

//也可以通过TimeZone.setTimeZone(String n)函数改变时区，n为时区参数名。

calendar = new GregorianCalendar(TimeZone.getTimeZone(tz));

t = new Thread(this);

t.start();

setSize(125, 125); // 设置画布大小

setBackground(Color.black);

}

// 重写父类的方法绘制时钟图形

public void paint(Graphics g) {

Graphics2Dg2d = (Graphics2D) g;

BasicStroke bstroke = new BasicStroke(2.0f);

g2d.setStroke(bstroke);

g2d.setColor(Color.green);

g2d.drawOval(0, 0, 100, 100);

bstroke = new BasicStroke(5.0f);

g2d.setStroke(bstroke);

g2d.drawLine(50, 0, 50, 5);

g2d.drawLine(0, 50, 5, 50);

g2d.drawLine(50, 95, 50, 98);

g2d.drawLine(95, 50, 98, 50);

double hourAngle = 2 * Math.PI * (seconds - 3 * 60 * 60)

/ (12 * 60 * 60);

double minuteAngle = 2 * Math.PI * (seconds - 15 * 60) / (60 * 60);

double secondAngle = 2 * Math.PI * (seconds - 15) / (60);

bstroke = new BasicStroke(5.0f);

g2d.setStroke(bstroke);

g2d.drawLine(50, 50, 50 + (int) (30 * Math.cos(hourAngle)),

50 + (int) (30 * Math.sin(hourAngle)));

bstroke = new BasicStroke(3.0f);

g2d.setStroke(bstroke);

g2d.drawLine(50, 50, 50 + (int) (40 * Math.cos(minuteAngle)),

50 + (int) (40 * Math.sin(minuteAngle)));

bstroke = new BasicStroke(1.0f);

g2d.setStroke(bstroke);

g2d.drawLine(50, 50, 50 + (int) (45 * Math.cos(secondAngle)),

50 + (int) (45 * Math.sin(secondAngle)));

g2d.setColor(Color.red);

g2d.drawString(city, 35, 115);

}

public void timeElapsed() {

//new Date()()获得当前时间

System.out.println(new Date()());

calendar.setTime(new Date()());

seconds = calendar.get(Calendar.HOUR) * 60 * 60

+ calendar.get(Calendar.MINUTE) * 60

+ calendar.get(Calendar.SECOND);

}

public void run() {

try {

while (true) {

Thread.sleep(300);

timeElapsed();

repaint();

}

} catch (InterruptedException e) {

}

}

}

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