Android 字节转化

Posted 2022-11-15 Andy__Wu

package cn.com.heaton.blelibrary.ble.utils;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;



/**
 * 字节的转换
 * Created by jerry on 2017/4/27.
 */

public class ByteUtils 

    //inputstream转byte[]
    public static byte[] toByteArray(InputStream input) 

        // ByteARRAYOUTPUTSTREAM  output = new ByteArrayOutputStream();

        ByteArrayOutputStream output = new ByteArrayOutputStream();
        byte[] buffer = new byte[4096];
        int n = 0;
        try 
            while (-1 != (n = input.read(buffer))) 
                output.write(buffer, 0, n);
            
         catch (IOException e) 
            e.printStackTrace();
        
        return output.toByteArray();
    

    //将字节数组转换为short类型，即统计字符串长度
    public static short bytes2Short2(byte[] b) 

        short i = (short) (((b[1] & 0xff) << 8) | b[0] & 0xff);
        return i;

    

    //将字节数组转换为16进制字符串
    public static String BinaryToHexString(byte[] bytes) 

        String hexStr = "0123456789ABCDEF";
        String result = "";
        String hex = "";
        for (byte b : bytes) 
            hex = String.valueOf(hexStr.charAt((b & 0xF0) >> 4));
            hex += String.valueOf(hexStr.charAt(b & 0x0F));
            result += hex + " ";
        
        return result;
    

    //3.short转换为byte数组
    public static byte[] short2Bytes(short value) 
        byte[] data = new byte[2];
        data[0] = (byte) (value >> 8 & 0xff);
        data[1] = (byte) (value & 0xFF);
        return data;
    

    /**
     * 将int转化成byte[]
     *
     * @param res 要转化的整数
     * @return 对应的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;
    

    //  int zhuanhuawei byte[4]
    
    /**
     * 将byte[]转化成int  // byte[] int  mingitan byte[] int
     * @param res 要转化的byte[]
     * @return 对应的整数
     */
    public static int byte2int(byte[] res) 
        int targets = (res[0] & 0xff) | ((res[1] << 8) & 0xff00) | ((res[2] << 24) >>> 8) | (res[3] << 24);
        return targets;
    


    public static String byteArrayToHexStr(byte[] byteArray) 
        if (byteArray == null)
            return null;
        
        char[] hexArray = "0123456789ABCDEF".toCharArray();
        char[] hexChars = new char[byteArray.length * 2];
        for (int j = 0; j < byteArray.length; j++) 
            int v = byteArray[j] & 0xFF;
            hexChars[j * 2] = hexArray[v >>> 4];
            hexChars[j * 2 + 1] = hexArray[v & 0x0F];
        
        return new String(hexChars);
    
    
    
    public static byte[] hexStrToByteArray(String str)
    
        if (str == null) 
            return null;
        
        if (str.length() == 0) 
            return new byte[0];
        
        byte[] byteArray = new byte[str.length() / 2];
        for (int i = 0; i < byteArray.length; i++)
            String subStr = str.substring(2 * i, 2 * i + 2);
            byteArray[i] = ((byte) Integer.parseInt(subStr, 16));
        
        return byteArray;