Java Byte Array Create toBytes(String hex)

Description

Convert hex string to byte array.

License

Apache License

Parameter

Parameter	Description
hex	Hex string. e.g. 38ff0e2a86

Return

Byte array.

Declaration

public static byte[] toBytes(String hex) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright 2017 UIA//from   ww  w  .j  a v  a2s.com
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 *******************************************************************************/

public class Main {
    /**
     * Convert hex string to byte array.
     * @param hex Hex string. e.g. 38ff0e2a86
     * @return Byte array.
     */
    public static byte[] toBytes(String hex) {
        String data = hex.length() % 2 == 1 ? "0" + hex : hex;
        byte[] result = new byte[data.length() / 2];
        for (int i = 0; i < result.length; i++) {
            result[i] = (byte) Integer.parseInt(data.substring(2 * i, 2 * i + 2), 16);
        }
        return result;
    }

    /**
     * Convert hex string to byte array.
     * @param hex Hex string. e.g. ab12cd34
     * @param fixAtHead Add '0' at head if this is true or add '0' to tail when length of hex string is odd.
     * @return Byte array.
     */
    public static byte[] toBytes(String hex, boolean fixAtHead) {
        String data = hex.length() % 2 == 1 ? fixAtHead ? "0" + hex : hex + "0" : hex;
        byte[] result = new byte[data.length() / 2];
        for (int i = 0; i < result.length; i++) {
            result[i] = (byte) Integer.parseInt(data.substring(2 * i, 2 * i + 2), 16);
        }
        return result;
    }

    /**
     * Convert hex string to byte array.
     * @param hex Hex string. e.g. ab-12-cd-34
     * @param split Split string.
     * @return Byte array.
     */
    public static byte[] toBytes(String hex, String split) {
        String[] value = hex.split(split);
        byte[] result = new byte[value.length];
        for (int i = 0; i < value.length; i++) {
            result[i] = (byte) Integer.parseInt(value[i], 16);
        }
        return result;
    }
}

Related

1. toBytes(short s)
2. toBytes(short s)
3. toBytes(short sVal, byte[] bytes, boolean bigEndian)
4. toBytes(short value)
5. toBytes(short value)
6. toBytes(String hex)
7. toBytes(String hex)
8. toBytes(String hex)
9. toBytes(String hex)