JAVA— 时间格式与动态时间获取应用总结

Java获取日期常用格式

第一个直接上代码：

package org.time;

import java.text.DateFormat;
import java.util.Calendar;
import java.util.Date;

public class Time {
	
	public void getTimeByDate() {
		Date date = new Date();
		// 日期格式，精确到日
		DateFormat df1 = DateFormat.getDateInstance();
		System.out.println(df1.format(date));
		// 精确到时分秒
		DateFormat df2 = DateFormat.getDateTimeInstance();
		System.out.println(df2.format(date));
		// 只显示时分秒
		DateFormat df3 = DateFormat.getTimeInstance();
		System.out.println(df3.format(date));
		// 显示日期，周，上下午，精确到秒的时间
		DateFormat df4 = DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL);
		System.out.println(df4.format(date));
		// 显示日期，上下午，时间（精确到秒）
		DateFormat df5 = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG);
		System.out.println(df5.format(date));
		// 显示日期，上下午，时间（精确到分）
		DateFormat df6 = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT);
		System.out.println(df6.format(date));
		// 显示日期，时间（精确到分）
		DateFormat df7 = DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.MEDIUM);
		System.out.println(df7.format(date));

	}

	public void getTimeByCalendar() {
		Calendar cal = Calendar.getInstance();
		int year = cal.get(Calendar.YEAR); // 获取年份
		int month = cal.get(Calendar.MONTH);// 获取月份
		int day = cal.get(Calendar.DATE);// 获取日
		int hour = cal.get(Calendar.HOUR);// 获取小时
		int minute = cal.get(Calendar.MINUTE);// 获取分钟
		int second = cal.get(Calendar.SECOND);// 获取秒
		int WeekOfYear = cal.get(Calendar.DAY_OF_WEEK)-1;// 获取一周的第几天
		System.out.println("现在的时间是：公元" + year + "年" + month + "月" + day + "日      " + hour + "时" + minute + "分" + second
				+ "秒       星期" + WeekOfYear);

	}

}

测试：

package org.test;

import org.time.Time;

public class TimeTest {

	public static void main(String[] args) {
		Time time = new Time();
		time.getTimeByDate();
		System.out.println("--------------------------------------------");
		time.getTimeByCalendar();
	}

}

运行结果：

格式化输出日期时间：（2018-12-25 10:12:37）

	Date date =new Date();
	SimpleDateFormat dFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
	String time=dFormat.format(date);
	System.out.println(time);

计算某一月份的最大天数：

		Calendar time=Calendar.getInstance();
		time.clear();
		time.set(Calendar.YEAR,2018); //year 为 int  2018为第二个参数year
		time.set(Calendar.MONTH,12-1);//注意,Calendar对象默认一月为0 ，12为参数月份          
		int day=time.getActualMaximum(Calendar.DAY_OF_MONTH);//本月份的天数
	    System.out.println(day);

计算某年的一天是一年中的第几周：

		Calendar cal=Calendar.getInstance();
		cal.set(Calendar.YEAR, 2018);
		cal.set(Calendar.MONTH, 12-1); //注意：默认一月为0
		cal.set(Calendar.DAY_OF_MONTH, 25-1); //默认星期日为一周的第一天
		int weekno=cal.get(Calendar.WEEK_OF_YEAR);
		System.out.println(weekno);

计算一年中的第几星期是几号：

		SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd");
		Calendar cal=Calendar.getInstance();
		cal.set(Calendar.YEAR, 2018);
		cal.set(Calendar.WEEK_OF_YEAR, 51);
		cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);//某一周的星期一时间
		System.out.println(df.format(cal.getTime()));

以上学习总结参考：http://www.blogjava.net/xiaoyi/articles/295044.html

java实现获取当前年、月、日、小时、分钟、秒、毫秒

package org.time;

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

public class TimeUtil01 {
	
	public static String FORMAT_SHORT="yyyy-MM-dd";
	
	public static String FORMAT_LONG="yyyy-MM-dd HH:mm:ss";
	
	public static String FORMAT_FULL="yyyy-MM-dd HH:mm:ss.S";
	
	public static String FORMAT_SHORT_CN="yyyy年MM月dd日  HH时mm分ss秒";
	
	public static String FORMAT_LONG_CN="yyyy年MM月dd日  HH时mm分ss秒SSS毫秒";
	
	/*
	 * 获取当前时间 年月日时分秒毫秒
	 */
	public static String getTimeString(){
		SimpleDateFormat df = new SimpleDateFormat(FORMAT_FULL);
		Calendar calendar = Calendar.getInstance();
		return df.format(calendar.getTime());
	}
	
	/*
	 * 获取年份 
	 */
	public static String getYear(Date date){
		SimpleDateFormat sdf=new SimpleDateFormat("yyyy");
		Calendar calendar =Calendar.getInstance();
		return sdf.format(calendar.getTime());
	}
	
	/*
	 * 获取月份
	 */
	public static int getMonth(Date date){
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		return calendar.get(Calendar.MONTH)+1;
	}
	
	/*
	 * 获取日分
	 */
	public static int getDay(Date date){
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		return calendar.get(Calendar.DAY_OF_MONTH);
	}
	
	/*
	 * 获取小时
	 */
	public static int getHour(Date date){
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		return calendar.get(Calendar.HOUR_OF_DAY);
	}
	
	/*
	 * 获取分钟
	 */
	public static int getMinute(Date date){
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		return calendar.get(Calendar.MINUTE);
	}
	
	/*
	 * 获取秒
	 */
	public static int getSecond(Date date){
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		return calendar.get(Calendar.SECOND);
	}
	
	/*
	 * 获取毫秒
	 */
	public static long getMillis(Date date){
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		return calendar.getTimeInMillis();
	}


	public static void main(String[] args) {
		    System.out.println(getTimeString());
	        System.out.println("返回日期年份:"+getYear(new Date()));
	        System.out.println("返回月份："+getMonth(new Date()));
	        System.out.println("返回当天日份:"+getDay(new Date()));
	        System.out.println("返回当天小时:"+getHour(new Date()));
	        System.out.println("返回当天分:"+getMinute(new Date()));
	        System.out.println("返回当天秒:"+getSecond(new Date()));
	        System.out.println("返回当天毫秒:"+getMillis(new Date()));
	}

}

参考：http://yuncode.net/code/c_5194eee4e69e95

https://blog.csdn.net/zs20082012/article/details/56841368/

Java线程动态时间：

package org.time;

import java.awt.Dimension;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class TimeTest extends JFrame implements Runnable {
	private JFrame frame;
	private JPanel timePanel;
	private JLabel timeLabel;
	private JLabel displayArea;
	private String DEFAULT_TIME_FORMAT = "HH:mm:ss";
	private int ONE_SECOND = 1000;

	public TimeTest() {
		timePanel = new JPanel();
		timeLabel = new JLabel("CurrentTime: ");
		displayArea = new JLabel();

		timePanel.add(timeLabel);
		timePanel.add(displayArea);
		this.add(timePanel);
		this.setDefaultCloseOperation(EXIT_ON_CLOSE);
		this.setSize(new Dimension(200, 70));
		this.setLocationRelativeTo(null);
	}

	public void run() {
		while (true) {
			SimpleDateFormat dateFormatter = new SimpleDateFormat(DEFAULT_TIME_FORMAT);
			displayArea.setText(dateFormatter.format(Calendar.getInstance().getTime()));
			try {
				Thread.sleep(ONE_SECOND);
			} catch (Exception e) {
				displayArea.setText("Error!!!");
			}
		}
	}

	public static void main(String arg[]) {
		TimeTest df2 = new TimeTest();
		df2.setVisible(true);

		Thread thread1 = new Thread(df2);
		thread1.start();
	}

}

参考学习：https://www.jb51.net/article/53597.htm

JAVA— 时间格式与动态时间获取应用总结

Java获取日期常用格式

java实现获取当前年、月、日 、小时 、分钟、 秒、 毫秒

Java线程动态时间：

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