contentinfosource.java

一个用java写的mail.里面的代码值得我们去研究！学习。

/*
** $Id: ContentInfoSource.java,v 1.4 2001/05/07 12:37:22 kunugi Exp $
**
** Copyright (c) 2000-2001 Jeff Gay
** on behalf of ICEMail.org <http://www.icemail.org>
** Copyright (c) 1998-2000 by Timothy Gerard Endres
** 
** This program is free software.
** 
** You may redistribute it and/or modify it under the terms of the GNU
** General Public License as published by the Free Software Foundation.
** Version 2 of the license should be included with this distribution in
** the file LICENSE, as well as License.html. If the license is not
** included with this distribution, you may find a copy at the FSF web
** site at 'www.gnu.org' or 'www.fsf.org', or you may write to the
** Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139 USA.
**
** THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY OF ANY KIND,
** NOT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR
** OF THIS SOFTWARE, ASSUMES _NO_ RESPONSIBILITY FOR ANY
** CONSEQUENCE RESULTING FROM THE USE, MODIFICATION, OR
** REDISTRIBUTION OF THIS SOFTWARE. 
*/

package org.icemail.mail.smime;

import java.io.IOException;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import javax.activation.DataSource;

import iaik.pkcs.pkcs7.ContentInfo;
import iaik.pkcs.PKCSException;


public class ContentInfoSource implements DataSource
{
  private String       name_;
  private String       contentType_;
  private byte[]       data_;


  public
  ContentInfoSource( ContentInfo content, String name, String contentType )
    throws IOException, PKCSException {
    name_ = name;
    contentType_ = contentType;

    ByteArrayOutputStream oba = new ByteArrayOutputStream();
    content.writeTo( oba );
    data_ = oba.toByteArray();
  }

  public String
  getContentType() {
    return contentType_;
  }

  public String
  getName() {
    return name_;
  }

  public InputStream
  getInputStream() throws IOException {
    return new ByteArrayInputStream( data_ );
  }

  public OutputStream
  getOutputStream() throws IOException {
    throw new IOException( "ContentInfoSource is read-only" );
  }
}