NettyAndroid，Netty在Android中的使用

package com.azhon.netty.util; /** * 文件名: ByteUtil * 创建时间: 2018/10/24 on 21:50 * 描述: TODO * * @author 阿钟 */ public class ByteUtil { /** * 多个数组合并一个 * * @return */ public static byte[] byteMergerAll(byte[]... bytes) { int allLength = 0; for (byte[] b : bytes) { allLength += b.length; } byte[] allByte = new byte[allLength]; int countLength = 0; for (byte[] b : bytes) { System.arraycopy(b, 0, allByte, countLength, b.length); countLength += b.length; } return allByte; } /** * 将数据数据恢复成0 */ public static void resetBytes(byte[] bytes) { for (int i = 0; i < bytes.length; i++) { bytes[i] = 0; } } /** * 计算校验和 * * @param bytes * @param index 校验和结果所在的下标 * @return 是否成功 */ public static boolean checkSum(byte[] bytes, int index) { if (index > bytes.length - 1) { return false; } byte right = bytes[index]; int plus = 0; for (int i = 0; i < bytes.length; i++) { if (index != i) { plus += bytes[i]; } } return int2Byte(plus) == right; } /** * int 转byte字节 * * @param value int数字 * @return byte 字节 */ public static byte int2Byte(int value) { return (byte) value; } /** * byte 转int字节 * * @param value int数字 * @return byte 字节 */ public static int byte2Int(byte value) { return value & 0xFF; } /** * 两个十六进制字节转成一个int * * @return int */ public static int bytes2Int(byte[] bytes) { int a = ((bytes[0] & 0xf0) >> 4) * 4096; int b = (bytes[0] & 0x0f) * 256; int c = bytes[1] & 0xf0; int d = bytes[1] & 0x0f; return a + b + c + d; } /** * 4字节byte转int * * @return */ public static int fourBytes2Int(byte[] bytes) { return (bytes[0] & 0xff) | (bytes[1] & 0xff) << 8 | (bytes[2] & 0xff) << 16 | (bytes[3] & 0xff) << 24; } /** * byte字节转Bit * bit位（0～8位）是从右往左数的 eg:10000011 (位0：1，位2：1，位3：0) * * @param b 字节 * @param bitIndex 获取bit位的下标 * @return bit */ public static byte byteToBit(byte b, int bitIndex) { byte[] array = new byte[8]; for (int i = 7; i >= 0; i--) { array[i] = (byte) (b & 1); b = (byte) (b >> 1); } //倒序取 return array[8 - 1 - bitIndex]; } /** * long转DWORD数据类型 * 低位到高位 */ public static byte[] longToDword(long value) { byte[] data = new byte[4]; for (int i = 0; i < data.length; i++) { data[i] = (byte) (value >> (8 * (3 - i))); } return data; } /** * DWORD无符号整型数据转换为java的long型 */ public static long DwordToLong(byte buf[], int index) { int firstByte = (0x000000FF & ((int) buf[index])); int secondByte = (0x000000FF & ((int) buf[index + 1])); int thirdByte = (0x000000FF & ((int) buf[index + 2])); int fourthByte = (0x000000FF & ((int) buf[index + 3])); return ((long) (firstByte | secondByte << 8 | thirdByte << 16 | fourthByte << 24)) & 0xFFFFFFFFL; } /** * 一个int转4个字节的byte数组 * * @param value * @return */ public static byte[] intTo4Bytes(int value) { byte[] src = new byte[4]; src[0] = (byte) (value & 0xFF); src[1] = (byte) ((value >> 8) & 0xFF); src[2] = (byte) ((value >> 16) & 0xFF); src[3] = (byte) ((value >> 24) & 0xFF); return src; } public static byte[] intTo2Bytes(int value) { byte[] src = new byte[2]; src[0] = (byte) ((value >> 8) & 0xFF); src[1] = (byte) (value & 0xFF); return src; } /** * 把16进制字符串转换成字节数组 * * @return byte[] */ public static byte[] hexStringToByte(String hex) { int len = (hex.length() / 2); byte[] result = new byte[len]; char[] achar = hex.toCharArray(); for (int i = 0; i < len; i++) { int pos = i * 2; result[i] = (byte) (toByte(achar[pos]) << 4 | toByte(achar[pos + 1])); } return result; } private static int toByte(char c) { byte b = (byte) "0123456789ABCDEF".indexOf(c); return b; } /** * 计算校验和 * * @param bytes * @return 是否成功 */ public static byte getSum(byte[] bytes) { int plus = 0; for (int i = 0; i < bytes.length; i++) { plus += bytes[i]; } return (byte) plus; } }