Byte类型与各种基础类型之间的相互转化函数总结

这几天在做一个通讯协议，需要byte类型与各种类型之间相互转化，为了便于以后用到的时候查看，特此记录。

package com.changhong.electric_controll.util;

import java.io.ByteArrayOutputStream;
import java.nio.ByteBuffer;

import android.util.Log;

/*
 * 用于各种类型，进制与byte之间的转换
 * 
 * */
public class ByteUtils {
	private static String hexString="0123456789ABCDEF";

	
	/*将字符串转化为16进制，存入字符串数组中*/
	public static String string2Hex(String content) {
		byte[] bytes = content.getBytes();
		StringBuilder sb = new StringBuilder(bytes.length * 2);
		for(int i = 0; i < bytes.length; i++) {
			sb.append(hexString.charAt((bytes[i]&0xf0)>>4));
			sb.append(hexString.charAt((bytes[i]&0x0f)>>0));
		}
		return sb.toString();
	}

	/**将16进制字符串转化为10进制字符串**/
	public static String hexStr2Str(String hexStr)
	{
		String str = "0123456789ABCDEF";
		char[] hexs = hexStr.toCharArray();
		byte[] bytes = new byte[hexStr.length() / 2];
		int n;

		for (int i = 0; i < bytes.length; i++)
		{
			n = str.indexOf(hexs[2 * i]) * 16;
			n += str.indexOf(hexs[2 * i + 1]);
			bytes[i] = (byte) (n & 0xff);
		}
		return new String(bytes);
	}

	/*将16进制字符串转化为10进制字符串*/
	public static String toStringHex(String s)
	{
		byte[] baKeyword = new byte[s.length()/2];
		for(int i = 0; i < baKeyword.length; i++)
		{
			try
			{
				baKeyword[i] = (byte)(0xff & Integer.parseInt(s.substring(i*2, i*2+2),16));
			}
			catch(Exception e)
			{
				e.printStackTrace();
			}
		}
		try
		{
			s = new String(baKeyword, "utf-8");//UTF-16 le:Not
		}
		catch (Exception e1)
		{
			e1.printStackTrace();
		}
		return s;
	}
	
	/*将16进制字符串转化为bytes数组*/
	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;   
	}

	/*将bytes数组转化为16进制字符串*/
	public static String bytesToHexString(byte[] src){
		StringBuilder stringBuilder = new StringBuilder("");
		if (src == null || src.length <= 0) {
			return null;
		}
		for (int i = 0; i < src.length; i++) {
			int v = src[i] & 0xFF;
			String hv = Integer.toHexString(v);
			if (hv.length() < 2) {
				stringBuilder.append(0);
			}
			stringBuilder.append(hv);
		}
		return stringBuilder.toString().toUpperCase();
	}

	/*将十六进制字符串解码成字符串*/
	public static String decode(String bytes)
	{
		ByteArrayOutputStream baos = new ByteArrayOutputStream( bytes.length() / 2 );
		//将每2位16进制整数组装成一个字节
		for(int i = 0; i < bytes.length() ; i+=2)
			baos.write((hexString.indexOf(bytes.charAt(i))<<4 | hexString.indexOf(bytes.charAt(i+1))));
		return new String(baos.toByteArray());
	}


	
	/*将Short Int类型转化为16进制再转化为byte数组*/
	private static byte toByte(char c) {   
	    byte b = (byte) hexString.indexOf(c);   
	    return b;   
	}
	
	
	/*将INT类型转化为10进制byte数组（占4字节）*/
	public static byte[] int2Bytes(int num) {
		byte[] byteNum = new byte[4];
		for (int ix = 0; ix < 4; ++ix) {
			int offset = 32 - (ix + 1) * 8;
			byteNum[ix] = (byte) ((num >> offset) & 0xff);
		}
		return byteNum;
	}


	/*将int类型转化为16进制数，转化为byte数组类型*/
	public static byte[] intToHexToBytes(short num) {
		byte[] byteNum = new byte[]{(byte)((num>>8)&0xFF), (byte)(num&0xFF)};
	    return byteNum;
	}

	/*将int类型转化为16进制数，转化为byte类型*/
	public static byte intToHexToByte(int integer) {
		String hexStr = Integer.toHexString(integer);
		Log.i("data", hexStr);
		return Byte.valueOf(hexStr,16);
	} 
	
	
	/*将int类型转化为byte类型*/
	public static byte int2OneByte(int num) {
		return (byte) (num & 0x000000ff);
	}

	
	/*将2个字节的byte数组转化为int类型*/
	public static int twoBytes2Int(byte[] buffer) {
		return buffer[0] | buffer[1] << 8;
	}

	/*将byte类型数转化为int类型*/
	public static int oneByte2Int(byte byteNum) {
		return byteNum & 0xFF;
	}

	/*将16进制的byte类型转化为10进制的int类型*/
	public static int byteToInt16(byte b) {
		String result = Integer.toHexString(b & 0xFF);
		return Integer.valueOf(result, 16);
	}

	/*将byte类型数组（4字节）转化为int类型*/
	public static int bytes2Int(byte[] byteNum) {
		int num = 0;
		for (int ix = 0; ix < 4; ++ix) {
			num <<= 8;
			num |= (byteNum[ix] & 0xff);
		}
		return num;
	}



	/*将长整形转化为byte数组*/
	public static byte[] long2Bytes(long num) {
		byte[] byteNum = new byte[8];
		for (int ix = 0; ix < 8; ++ix) {
			int offset = 64 - (ix + 1) * 8;
			byteNum[ix] = (byte) ((num >> offset) & 0xff);
		}
		return byteNum;
	}

	/*将byte数组（长度为8）转化为长整形*/
	public static long bytes2Long(byte[] byteNum) {
		long num = 0;
		for (int ix = 0; ix < 8; ++ix) {
			num <<= 8;
			num |= (byteNum[ix] & 0xff);
		}
		return num;
	}
	



	/**将16进制的byte数组转化为float类型**/
	public static float byte162float(byte[] num){
		String hexString=bytesToHexString(num);
		Integer temp=Integer.valueOf(hexString.trim(), 16);
		float value=Float.intBitsToFloat(temp.intValue());
		System.out.println(value);
		return value;
	}


	/**将float转化为byte数组，占用4个字节**/
	public static byte [] float2ByteArray (float value)
	{
		return ByteBuffer.allocate(4).putFloat(value).array();
	}

	/**
	 * 将10进制byte数组转化为Float
	 *
	 * @param b 字节（至少4个字节）
	 * @param index 开始位置
	 * @return
	 */
	public static float bytes2float(byte[] b, int index) {
		int l;
		l = b[index + 0];
		l &= 0xff;
		l |= ((long) b[index + 1] << 8);
		l &= 0xffff;
		l |= ((long) b[index + 2] << 16);
		l &= 0xffffff;
		l |= ((long) b[index + 3] << 24);
		return Float.intBitsToFloat(l);
	}


	/*两个byte数组是否值相等的比较*/
	public static boolean byteCompare(byte[] data1, byte[] data2, int len) {
		if (data1 == null && data2 == null) {
			return true;
		}
		if (data1 == null || data2 == null) {
			return false;
		}
		if (data1 == data2) {
			return true;
		}
		boolean bEquals = true;
		int i;
		for (i = 0; i < data1.length && i < data2.length && i < len; i++) {
			if (data1[i] != data2[i]) {
				bEquals = false;
				break;
			}
		}
		return bEquals;
	}
	
	/*将byte（字节）类型转化为位*/
	public static String byteToBit(byte b) {  
	    return "" +(byte)((b >> 7) & 0x1) +   
	    (byte)((b >> 6) & 0x1) +   
	    (byte)((b >> 5) & 0x1) +   
	    (byte)((b >> 4) & 0x1) +   
	    (byte)((b >> 3) & 0x1) +   
	    (byte)((b >> 2) & 0x1) +   
	    (byte)((b >> 1) & 0x1) +   
	    (byte)((b >> 0) & 0x1);  
	} 
	

	
	/*将指定byte数组以16进制的形式打印到控制台 */  
	public static void printHexString( byte[] b) {     
	   for (int i = 0; i < b.length; i++) {    
	     String hex = Integer.toHexString(b[i] & 0xFF);    
	     if (hex.length() == 1) {    
	       hex = "0" + hex;    
	     }    
	     System.out.print(hex.toUpperCase() );    
	   }    
	}  
	
	/*判断字符串中是否出现非数字字符，如果出现非数字字符，返回true，否则返回false*/
	public static  boolean ExistOtherChar(String str){
		String numstr = "0123456789";
		int i = 0;
		for(i = 0 ; i < str.length() ; i++ )
		{
			if(numstr.indexOf(str.charAt(i)) == -1 )
			{
				return true;
			}
		}
		return false;
	}



	/*判断字符串中是否只包含字母，只包含字母，返回true，否则返回false*/
	public  static boolean ExistChar(String str){
			  String regex = "[a-zA-Z]+$";
			  return str.matches(regex);
		}
	
	/*判断版本号是否符合格式*/
	public static boolean LegalVersion(String str){
		String regex = "[0-9]+[.][0-9]+[.][0-9]+";
		return str.matches(regex);
	}
}