rfc822dateformat.java

java 开发的邮件服务器平台。支持以下协议。 协议可以修改为自己的专门标识

/***********************************************************************
 * Copyright (c) 2000-2004 The Apache Software Foundation.             *
 * 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 org.apache.james.util;

import java.util.Date;
import javax.mail.internet.MailDateFormat;

/**
 * A thread safe wrapper for the <code>javax.mail.internet.MailDateFormat</code> class.
 *
 */
public class RFC822DateFormat extends SynchronizedDateFormat {
    /**
     * A static instance of the RFC822DateFormat, used by toString
     */
    private static RFC822DateFormat instance; 

    static {
        instance = new RFC822DateFormat();
    }

    /**
     * This static method allows us to format RFC822 dates without
     * explicitly instantiating an RFC822DateFormat object.
     *
     * @return java.lang.String
     * @param d Date
     *
     * @deprecated This method is not necessary and is preserved for API
     *             backwards compatibility.  Users of this class should
     *             instantiate an instance and use it as they would any
     *             other DateFormat object.
     */
    public static String toString(Date d) {
        return instance.format(d);
    }

    /**
     * Constructor for RFC822DateFormat
     */
    public RFC822DateFormat() {
        super(new MailDateFormat());
    }
}