Java ByteBuffer to Hex byteBufferToHex(ByteBuffer buffer)

Description

Returns a hexadecimal representation of the bytes written to ByteBuffer (i.e.

License

Open Source License

Declaration

public static String byteBufferToHex(ByteBuffer buffer) 

Method Source Code

//package com.java2s;
/**//  w ww .jav a 2 s . co m
 * @license
 * Copyright 2016 Google 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.
 */

import java.nio.ByteBuffer;

public class Main {
    /**
     * Returns a hexadecimal representation of the bytes written to ByteBuffer (i.e. all the bytes
     * before position()).
     */
    public static String byteBufferToHex(ByteBuffer buffer) {
        ByteBuffer tmp = buffer.duplicate();
        tmp.flip();
        byte[] bytes = new byte[tmp.remaining()];
        tmp.get(bytes);
        return bytesToHex(bytes);
    }

    public static String bytesToHex(byte[] bytes) {
        // bytesToHex is used to convert output from Cipher.
        // cipher.update can return null, which is equivalent to returning
        // no plaitext rsp. ciphertext.
        if (bytes == null) {
            return "";
        }
        String chars = "0123456789abcdef";
        StringBuilder result = new StringBuilder(2 * bytes.length);
        for (byte b : bytes) {
            // convert to unsigned
            int val = b & 0xff;
            result.append(chars.charAt(val / 16));
            result.append(chars.charAt(val % 16));
        }
        return result.toString();
    }
}

Related

1. asHexString(ByteBuffer buffer)
2. asHexString(StringBuilder temp, ByteBuffer buffer)
3. bytesToHex(ByteBuffer bytes)
4. bytesToHex(ByteBuffer bytes)
5. bytesToHexString(ByteBuffer b)
6. toHex(ByteBuffer bb)