Java 日期格式化 DateFormat

DateFormat：抽象类不能实例化，可以用getTimeInstance, getDateInstance, or getDateTimeInstance 得到对象。

具体介绍：https://docs.oracle.com/javase/6/docs/api/java/text/DateFormat.html

通过getDateInstance() 得到格式化对象

SHORT is completely numeric, such as 12.13.52 or 3:30pm
MEDIUM is longer, such as Jan 12, 1952
LONG is longer, such as January 12, 1952 or 3:30:32pm
FULL is pretty completely specified, such as Tuesday, April 12, 1952 AD or 3:30:42pm PST

DateFormat dfLONG = DateFormat.getDateInstance(DateFormat.LONG, Locale.CHINA);

SimpleDateFormat：更简单得到格式化对象

参数含义：https://docs.oracle.com/javase/6/docs/api/java/text/SimpleDateFormat.html

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

测试代码：

package com.DL;

/**
 * @author 段乐
 * 日期格式化测试
 */

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;

public class DateFormatTest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Date date = new Date();
		System.out.println(date);
		/**
		 * 使用getDateInstance方法得到格式化对象
		 * */
		DateFormat dfFULL = DateFormat.getDateInstance(DateFormat.FULL);
		DateFormat dfLONG = DateFormat.getDateInstance(DateFormat.LONG, Locale.CHINA);
		DateFormat dfMEDIUM = DateFormat.getDateInstance(DateFormat.MEDIUM, Locale.CHINA);
		DateFormat dfSHOT = DateFormat.getDateInstance(DateFormat.SHORT, Locale.CHINA);
		System.out.println(dfFULL.format(date));
		System.out.println(dfLONG.format(date));
		System.out.println(dfMEDIUM.format(date));
		System.out.println(dfSHOT.format(date));
		/**
		 * 压缩成Date类
		 */
		String myString = "2018年07月24日 星期二";
		try {
			Date myDate = dfFULL.parse(myString);
			System.out.println(myDate);
		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		/**
		 * 使用SimpleDateFormat创建格式化对象
		 */
		DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd E a HH:mm:ss");
		System.out.println(sdf.format(date));
		
	}

}

运行结果：

Java 日期格式化 DateFormat

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