TimestampUtils.java

/*
 * Copyright (C) 2013  WhiteCat 白猫 (www.thinkandroid.cn)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.ta.util.extend;

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

/**
 * @Title TimestampUtil
 * @Package com.ta.util
 * @Description 时间戳操作类分享的类
 * @author 白猫
 * @date 2013-1-22 下午 14:57
 * @version V1.0
 */
public class TimestampUtils
{
	private static long day = 7;

	/**
	 * 获得当前时间戳
	 * 
	 * @return
	 */
	public static String getTimestamp()
	{
		String unixTimeGMT;
		try
		{
			long unixTime = System.currentTimeMillis();
			unixTimeGMT = unixTime + "";
		} catch (Exception e)
		{
			// TODO: handle exception
			unixTimeGMT = "";
		}
		return unixTimeGMT;

	}

	/**
	 * 获得当前时间戳
	 * 
	 * @return
	 */
	public static long getIntTimestamp()
	{
		long unixTimeGMT = 0;
		try
		{
			unixTimeGMT = System.currentTimeMillis();
		} catch (Exception e)
		{
			// TODO: handle exception
		}
		return unixTimeGMT;

	}

	/**
	 * 返回时间戳间隔
	 * 
	 * @return
	 */
	public static boolean compareTimestamp(long currentTimestap,
			long oldTimestap)
	{
		Boolean isExceed = false;
		if (gapTimestamp(currentTimestap, oldTimestap) > 86400 * day)
		{
			isExceed = true;
		}
		return isExceed;
	}

	public static long gapTimestamp(long currentTimestap, long oldTimestap)
	{
		return (currentTimestap - oldTimestap);
	}

	/**
	 * 对时间戳格式进行格式化，保证时间戳长度为13位
	 * 
	 * @param timestamp
	 *            时间戳
	 * @return 返回为13位的时间戳
	 */
	public static String formatTimestamp(String timestamp)
	{
		if (timestamp == null || "".equals(timestamp))
		{
			return "";
		}
		String tempTimeStamp = timestamp + "00000000000000";
		StringBuffer stringBuffer = new StringBuffer(tempTimeStamp);
		return tempTimeStamp = stringBuffer.substring(0, 13);
	}

	/**
	 * 根据 timestamp 生成各类时间状态串
	 * 
	 * @param timestamp
	 *            距1970 00:00:00 GMT的秒数
	 * @param format
	 *            格式
	 * @return 时间状态串(如：刚刚5分钟前)
	 */
	public static String getTimeState(String timestamp, String format)
	{
		if (timestamp == null || "".equals(timestamp))
		{
			return "";
		}

		try
		{
			timestamp = formatTimestamp(timestamp);
			long _timestamp = Long.parseLong(timestamp);
			if (System.currentTimeMillis() - _timestamp < 1 * 60 * 1000)
			{
				return "刚刚";
			} else if (System.currentTimeMillis() - _timestamp < 30 * 60 * 1000)
			{
				return ((System.currentTimeMillis() - _timestamp) / 1000 / 60)
						+ "分钟前";
			} else
			{
				Calendar now = Calendar.getInstance();
				Calendar c = Calendar.getInstance();
				c.setTimeInMillis(_timestamp);
				if (c.get(Calendar.YEAR) == now.get(Calendar.YEAR)
						&& c.get(Calendar.MONTH) == now.get(Calendar.MONTH)
						&& c.get(Calendar.DATE) == now.get(Calendar.DATE))
				{
					SimpleDateFormat sdf = new SimpleDateFormat("今天 HH:mm");
					return sdf.format(c.getTime());
				}
				if (c.get(Calendar.YEAR) == now.get(Calendar.YEAR)
						&& c.get(Calendar.MONTH) == now.get(Calendar.MONTH)
						&& c.get(Calendar.DATE) == now.get(Calendar.DATE) - 1)
				{
					SimpleDateFormat sdf = new SimpleDateFormat("昨天 HH:mm");
					return sdf.format(c.getTime());
				} else if (c.get(Calendar.YEAR) == now.get(Calendar.YEAR))
				{
					SimpleDateFormat sdf = null;
					if (format != null && !format.equalsIgnoreCase(""))
					{
						sdf = new SimpleDateFormat(format);

					} else
					{
						sdf = new SimpleDateFormat("M月d日 HH:mm:ss");
					}

					return sdf.format(c.getTime());
				} else
				{
					SimpleDateFormat sdf = null;
					if (format != null && !format.equalsIgnoreCase(""))
					{
						sdf = new SimpleDateFormat(format);

					} else
					{
						sdf = new SimpleDateFormat("yyyy年M月d日 HH:mm:ss");
					}
					return sdf.format(c.getTime());
				}
			}
		} catch (Exception e)
		{
			e.printStackTrace();
			return "";
		}
	}
}