package org.fun.classdemo;

import java.util.Calendar;

import java.util.GregorianCalendar;

public class DateTime {

	private Calendar calendar = new GregorianCalendar(); // 实例化Calendar对象

	public String getDate() {// 2014-07-30

		StringBuffer buf = new StringBuffer();

		buf.append(calendar.get(Calendar.YEAR)).append("-");

		buf.append(this.addZero((calendar.get(Calendar.MONTH) + 1), 2)).append(

				"-");

		buf.append(this.addZero(calendar.get(Calendar.DAY_OF_MONTH), 2));

		return buf.toString();

	}

	public String getDateTime() {// 2014-07-30 10:19:34.123

		StringBuffer buf = new StringBuffer();

		buf.append(this.getDate()).append(" ");

		buf.append(this.addZero(calendar.get(Calendar.HOUR_OF_DAY), 2)).append(

				":");

		buf.append(this.addZero(calendar.get(Calendar.MINUTE), 2)).append(":");

		buf.append(this.addZero(calendar.get(Calendar.SECOND), 2)).append(".");

		buf.append(this.addZero(calendar.get(Calendar.MILLISECOND), 3));

		return buf.toString();

	}

	public String getDateComplete() {// 2014年07月30日

		StringBuffer buf = new StringBuffer();

		buf.append(calendar.get(Calendar.YEAR)).append("年");

		buf.append(this.addZero((calendar.get(Calendar.MONTH) + 1), 2)).append(

				"月");

		buf.append(this.addZero(calendar.get(Calendar.DAY_OF_MONTH), 2))

				.append("日");

		return buf.toString();

	}

	public String getDateTimeComplete() {// 2014年07月30日10时19分34秒123毫秒

		StringBuffer buf = new StringBuffer();

		buf.append(this.getDateComplete());

		buf.append(this.addZero(calendar.get(Calendar.HOUR_OF_DAY), 2)).append(

				"时");

		buf.append(this.addZero(calendar.get(Calendar.MINUTE), 2)).append("分");

		buf.append(this.addZero(calendar.get(Calendar.SECOND), 2)).append("秒");

		buf.append(this.addZero(calendar.get(Calendar.MILLISECOND), 3)).append(

				"毫秒");

		return buf.toString();

	}

	private String addZero(int temp, int len) {

		StringBuffer str = new StringBuffer();

		str.append(temp);// 增加数字

		while (str.length() < len) {

			str.insert(0, 0); // 在第一个位置加上字母0

		}

		return str.toString();

	}

	public static void main(String args[]) {

		System.out.println(new DateTime().getDate());

		System.out.println(new DateTime().getDateTime());

		System.out.println(new DateTime().getDateComplete());

		System.out.println(new DateTime().getDateTimeComplete());

	}

}