android中的byte数组转换

╰半夏微凉° 2022-08-13 13:57 270阅读 0赞

/**
    	 * 将一个单字节的byte转换成32位的int
    	 * 
    	 * @param b
    	 *            byte
    	 * @return convert result
    	 */
    	public static int unsignedByteToInt(byte b) {
    		return (int) b & 0xFF;
    	}
    
    	/**
    	 * 将一个单字节的Byte转换成十六进制的数
    	 * 
    	 * @param b
    	 *            byte
    	 * @return convert result
    	 */
    	public static String byteToHex(byte b) {
    		int i = b & 0xFF;
    		return Integer.toHexString(i);
    	}
    
    	/**
    	 * 将一个4byte的数组转换成32位的int
    	 * 
    	 * @param buf
    	 *            bytes buffer
    	 * @param byte[]中开始转换的位置
    	 * @return convert result
    	 */
    	public static long unsigned4BytesToInt(byte[] buf, int pos) {
    		int firstByte = 0;
    		int secondByte = 0;
    		int thirdByte = 0;
    		int fourthByte = 0;
    		int index = pos;
    		firstByte = (0x000000FF & ((int) buf[index]));
    		secondByte = (0x000000FF & ((int) buf[index + 1]));
    		thirdByte = (0x000000FF & ((int) buf[index + 2]));
    		fourthByte = (0x000000FF & ((int) buf[index + 3]));
    		index = index + 4;
    		return ((long) (firstByte << 24 | secondByte << 16 | thirdByte << 8 | fourthByte)) & 0xFFFFFFFFL;
    	}
    
    	/**
    	 * 将16位的short转换成byte数组
    	 * 
    	 * @param s
    	 *            short
    	 * @return byte[] 长度为2
    	 * */
    	public static byte[] shortToByteArray(short s) {
    		byte[] targets = new byte[2];
    		for (int i = 0; i < 2; i++) {
    			int offset = (targets.length - 1 - i) * 8;
    			targets[i] = (byte) ((s >>> offset) & 0xff);
    		}
    		return targets;
    	}
    
    	/**
    	 * 将32位整数转换成长度为4的byte数组
    	 * 
    	 * @param s
    	 *            int
    	 * @return byte[]
    	 * */
    	public static byte[] intToByteArray(int s) {
    		byte[] targets = new byte[2];
    		for (int i = 0; i < 4; i++) {
    			int offset = (targets.length - 1 - i) * 8;
    			targets[i] = (byte) ((s >>> offset) & 0xff);
    		}
    		return targets;
    	}
    
    	/**
    	 * long to byte[]
    	 * 
    	 * @param s
    	 *            long
    	 * @return byte[]
    	 * */
    	public static byte[] longToByteArray(long s) {
    		byte[] targets = new byte[2];
    		for (int i = 0; i < 8; i++) {
    			int offset = (targets.length - 1 - i) * 8;
    			targets[i] = (byte) ((s >>> offset) & 0xff);
    		}
    		return targets;
    	}
    
    	/** 32位int转byte[] */
    	public static byte[] int2byte(int res) {
    		byte[] targets = new byte[4];
    		targets[0] = (byte) (res & 0xff);// 最低位
    		targets[1] = (byte) ((res >> 8) & 0xff);// 次低位
    		targets[2] = (byte) ((res >> 16) & 0xff);// 次高位
    		targets[3] = (byte) (res >>> 24);// 最高位,无符号右移。
    		return targets;
    	}
    
    	/**
    	 * 将长度为2的byte数组转换为16位int
    	 * 
    	 * @param res
    	 *            byte[]
    	 * @return int
    	 * */
    	public static int byte2int(byte[] res) {
    		// res = InversionByte(res);
    		// 一个byte数据左移24位变成0x??000000，再右移8位变成0x00??0000
    		int targets = (res[0] & 0xff) | ((res[1] << 8) & 0xff00); // | 表示安位或
    		return targets;
    	}
    
    	/**
    	 * byte数组与short数组转换
    	 * 
    	 * @param data
    	 * @param items
    	 * @return
    	 */
    	public static short[] byteArray2ShortArray(byte[] data) {
    		if (data == null) {
    			// Log.e(TAG, "byteArray2ShortArray, data = null");
    			return null;
    		}
    
    		short[] retVal = new short[data.length / 2];
    		for (int i = 0; i < retVal.length; i++) {
    			retVal[i] = (short) ((data[i * 2] & 0xff) | (data[i * 2 + 1] & 0xff) << 8);
    		}
    
    		return retVal;
    	}
    
    	/**
    	 * byte数组与short数组转换
    	 * 
    	 * @param data
    	 * @param items
    	 * @return
    	 */
    	public static byte[] shortArray2ByteArray(short[] data) {
    		byte[] retVal = new byte[data.length * 2];
    		for (int i = 0; i < retVal.length; i++) {
    			int mod = i % 2;
    			if (mod == 0) {
    				retVal[i] = (byte) (data[i / 2]);
    			} else {
    				retVal[i] = (byte) (data[i / 2] >> 8);
    			}
    		}
    
    		return retVal;
    	}
    
    	/**
    	 * 对象转数组
    	 * 
    	 * @param obj
    	 * @return
    	 */
    	public static byte[] toByteArray(Object obj) {
    		byte[] bytes = null;
    		ByteArrayOutputStream bos = new ByteArrayOutputStream();
    		try {
    			ObjectOutputStream oos = new ObjectOutputStream(bos);
    			oos.writeObject(obj);
    			oos.flush();
    			bytes = bos.toByteArray();
    			oos.close();
    			bos.close();
    		} catch (IOException ex) {
    			ex.printStackTrace();
    		}
    		return bytes;
    	}
    
    	/**
    	 * 数组转对象
    	 * 
    	 * @param bytes
    	 * @return
    	 */
    	public static Object toObject(byte[] bytes) {
    		Object obj = null;
    		try {
    			ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
    			ObjectInputStream ois = new ObjectInputStream(bis);
    			obj = ois.readObject();
    			ois.close();
    			bis.close();
    		} catch (IOException ex) {
    			ex.printStackTrace();
    		} catch (ClassNotFoundException ex) {
    			ex.printStackTrace();
    		}
    		return obj;
    	}