返回在类型0（Netscape）Cookie中用于过期时间的日期格式。

/**

 * Copyright (c) 2000-2016 Liferay, Inc. All rights reserved.

 *

 * 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.nowjava;


import java.text.DateFormat;
/** 
来 自 
NowJava.com
**/

import java.text.SimpleDateFormat;

import java.util.Locale;

import java.util.TimeZone;


public class Main {

    /**

     * Returns the date format used for expiry times in type zero (Netscape) cookies. Also used as the date format for

     * portlet session expiries. Creates a new instance, so thread safe.

     *

     * @return  the date format used for expiry times in type zero (Netscape) cookies

     */

    public static DateFormat getCookieDateFormat() {

        DateFormat format = new SimpleDateFormat(