Java Base64 Encode toBase64(final byte[] bytes)

Description

Converts the byte array into a Base64 (RFC 2045) string.

License

Apache License

Parameter

Parameter	Description
bytes	The bytes to convert.

Return

The string version.

Declaration

public static String toBase64(final byte[] bytes) 

Method Source Code

//package com.java2s;
/*// w  ww  .ja v  a  2 s.  c o m
 * #%L
 * IOUtils.java - mongodb-async-driver - Allanbank Consulting, Inc.
 * %%
 * Copyright (C) 2011 - 2014 Allanbank Consulting, Inc.
 * %%
 * 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.
 * #L%
 */

public class Main {
    /** Base64 encoding array according to RFC 2045. */
    private static final char[] BASE_64_CHARS = ("ABCDEFGHIJKLMNOPQRSTUVWXYZ"
            + "abcdefghijklmnopqrstuvwxyz0123456789+/").toCharArray();

    /**
     * Converts the byte array into a Base64 (RFC 2045) string.
     *
     * @param bytes
     *            The bytes to convert.
     * @return The string version.
     */
    public static String toBase64(final byte[] bytes) {
        final int length = bytes.length;

        // Create a buffer with the maximum possible length.
        final StringBuffer result = new StringBuffer(4 * ((length + 2) / 3));

        // Handle each 3 byte group.
        int index = 0;
        final int numGroups = length / 3;
        for (int i = 0; i < numGroups; i++) {
            final int byte0 = bytes[index++] & 0xff;
            final int byte1 = bytes[index++] & 0xff;
            final int byte2 = bytes[index++] & 0xff;
            result.append(BASE_64_CHARS[byte0 >> 2]);
            result.append(BASE_64_CHARS[((byte0 << 4) & 0x3f) | (byte1 >> 4)]);
            result.append(BASE_64_CHARS[((byte1 << 2) & 0x3f) | (byte2 >> 6)]);
            result.append(BASE_64_CHARS[byte2 & 0x3f]);
        }

        // Partial group with padding.
        final int numBytesInLastGroup = length - (3 * numGroups);
        if (numBytesInLastGroup > 0) {
            final int byte0 = bytes[index++] & 0xff;
            result.append(BASE_64_CHARS[byte0 >> 2]);
            if (numBytesInLastGroup == 1) {
                result.append(BASE_64_CHARS[(byte0 << 4) & 0x3f]);
                result.append("==");
            } else {
                final int byte1 = bytes[index++] & 0xff;
                result.append(BASE_64_CHARS[((byte0 << 4) & 0x3f) | (byte1 >> 4)]);
                result.append(BASE_64_CHARS[(byte1 << 2) & 0x3f]);
                result.append('=');
            }
        }

        return result.toString();
    }
}

Related

1. toBase64(byte[] array)
2. toBase64(byte[] aValue)
3. toBase64(byte[] buf, int start, int length)
4. toBase64(byte[] data)
5. toBase64(byte[] data)
6. toBase64(final byte[] value)
7. toBase64(final String str)
8. toBase64(int x)
9. toBase64(long num)