Simple Base64 string decoding function : Base64 « Development Class « Java

Simple Base64 string decoding function

 * Copyright 2000-2001,2004 The Apache Software Foundation.
 * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.jetspeed.util;

import javax.mail.internet.MimeUtility;

 * Simple Base64 string decoding function
 * @author Jason Borden <>
 * This class was copied from the jakarta-james project.
 * The only change made, besides comments, is the package name.
 * This class orgininated in org.apache.james.util as version 1.3
 * which was committed by darrel on 2002/01/18 02:48:39
 * $Id:,v 1.5 2004/02/23 03:23:42 jford Exp $
 * Committed on $Date: 2004/02/23 03:23:42 $ by: $Name: JETSPEED-RELEASE-1-5 $ 

public class Base64 {

    public static String decodeAsString(String b64string) throws Exception
        return new String(decodeAsByteArray(b64string));

    public static byte[] decodeAsByteArray(String b64string) throws Exception
        InputStream in = MimeUtility.decode(new ByteArrayInputStream(
                         b64string.getBytes()), "base64");

        ByteArrayOutputStream out = new ByteArrayOutputStream();
            int b =;
            if (b == -1) break;
            else out.write(b);
        return out.toByteArray();

    public static String encodeAsString(String plaintext) throws Exception
        return encodeAsString(plaintext.getBytes());

    public static String encodeAsString(byte[] plaindata) throws Exception
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ByteArrayOutputStream inStream = new ByteArrayOutputStream();

        inStream.write(plaindata, 0, plaindata.length);

        // pad
        if ((plaindata.length % 3 ) == 1)
        else if((plaindata.length % 3 ) == 2)

        inStream.writeTo(MimeUtility.encode(out, "base64"));
        return out.toString();



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