com.generallycloud.baseio.codec.http11.HttpHeaderDateFormat Maven / Gradle / Ivy

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/*
 * Copyright 2015-2017 GenerallyCloud.com
 *  
 * 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.generallycloud.baseio.codec.http11;

import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

import com.generallycloud.baseio.common.DateUtil;

/**
 * @author wangkai
 *
 */
public class HttpHeaderDateFormat {

	private static final HttpHeaderDateFormat HTTP_HEADER_DATE_FORMAT = new HttpHeaderDateFormat();

	public static HttpHeaderDateFormat getFormat() {
		return HTTP_HEADER_DATE_FORMAT;
	}

	private TimeZone GTM = TimeZone.getTimeZone("GTM");

	public Date parse(String source) {
		int day = Integer.parseInt(source.substring(5, 7));
		int year = Integer.parseInt(source.substring(12, 16));
		int hour = Integer.parseInt(source.substring(17, 19));
		int minute = Integer.parseInt(source.substring(20, 22));
		int second = Integer.parseInt(source.substring(23, 25));
		int month = getMonth(source.substring(8, 11));

		Calendar calendar = Calendar.getInstance(GTM);
		calendar.set(Calendar.YEAR, year);
		calendar.set(Calendar.MONTH, month);
		calendar.set(Calendar.DAY_OF_MONTH, day);
		calendar.set(Calendar.HOUR_OF_DAY, hour);
		calendar.set(Calendar.MINUTE, minute);
		calendar.set(Calendar.SECOND, second);
		calendar.set(Calendar.MILLISECOND, 0);
		return calendar.getTime();
	}

	public static void main(String[] args) {

		String stringDate = "Tue, 11 Apr 2017 05:18:52 GTM";
		
		System.out.println(stringDate);

		Date d = getFormat().parse(stringDate);

		System.out.println(DateUtil.yyyy_MM_dd_HH_mm_ss.format(d));

		System.out.println(getFormat().format(d.getTime()));
	}

	private int getMonth(String month) {
		switch (month) {
		case "Jan":
			return 0;
		case "Feb":
			return 1;
		case "Mar":
			return 2;
		case "Apr":
			return 3;
		case "May":
			return 4;
		case "Jun":
			return 5;
		case "Jul":
			return 6;
		case "Aug":
			return 7;
		case "Sep":
			return 8;
		case "Oct":
			return 9;
		case "Nov":
			return 10;
		case "Dec":
			return 11;
		default:
			return -1;
		}
	}

	private String[]	WEEK_DAYS	= new String[] { "", "Sun", "Mon", "Tue", "Wed", "Thu", "Fri",
			"Sat" };

	private String[]	MONTHS	= new String[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul",
			"Aug", "Sep", "Oct", "Nov", "Dec" };

	public String format(long time) {
		
		Calendar calendar = Calendar.getInstance(GTM);
		calendar.setTimeInMillis(time);

		int weekDay = calendar.get(Calendar.DAY_OF_WEEK);
		int month = calendar.get(Calendar.MONTH);

		int day = calendar.get(Calendar.DAY_OF_MONTH);
		int year = calendar.get(Calendar.YEAR);
		int hour = calendar.get(Calendar.HOUR_OF_DAY);
		int minute = calendar.get(Calendar.MINUTE);
		int second = calendar.get(Calendar.SECOND);

		StringBuilder b = new StringBuilder(25);
		b.append(WEEK_DAYS[weekDay]);
		b.append(',');
		b.append(' ');
		if (day < 10) {
			b.append('0');
		}
		b.append(day);
		b.append(' ');
		b.append(MONTHS[month]);
		b.append(' ');
		b.append(year);
		b.append(' ');
		if (hour < 10) {
			b.append('0');
		}
		b.append(hour);
		b.append(':');
		if (minute < 10) {
			b.append('0');
		}
		b.append(minute);
		b.append(':');
		if (second < 10) {
			b.append('0');
		}
		b.append(second);
		b.append(" GTM");

		return b.toString();
	}

}