java 16进制字符串转base64_16进制字符串，byte[] ，base64三者之间的转换

最新推荐文章于 2025-04-21 16:52:30 发布

陈柏龄

最新推荐文章于 2025-04-21 16:52:30 发布

阅读量3.1k

点赞数

文章标签： java 16进制字符串转base64

本文链接：https://blog.youkuaiyun.com/weixin_28757113/article/details/114228387

版权

这是一个Java工具类，用于16进制字符串、byte数组和Base64之间的转换。包括hexToByte方法将16进制字符串转为byte数组，str2HexStr将字符串转为16进制，以及hexStringToBytesToBase64将16进制字符串转为Base64编码。同时，还提供了Base64编码和解码的功能。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

packagecom.lgdz.qydevice.utils;

importcn.hutool.core.codec.Base64;

importcn.hutool.core.util.CharsetUtil;

importcn.hutool.core.util.HexUtil;

importsun.misc.BASE64Decoder;

public classHexstringToByteUtil {

public byte[] hexToByte(String hex) {

/***先去掉16进制字符串的空格*/hex = hex.replace(" ", "");

/***字节数组长度为16进制字符串长度的一半*/intbyteLength = hex.length() / 2;

byte[] bytes = new byte[byteLength];

intm = 0;

intn = 0;

for(inti = 0; i < byteLength; i++) {

m = i * 2+ 1;

n = m + 1;

intintHex = Integer.decode("0x"+ hex.substring(i * 2, m) + hex.substring(m, n));

bytes[i] = Byte.valueOf((byte) intHex);

}

returnbytes;

}

/***字符串转为16进制字符串*/

public staticString str2HexStr(String str) {

char[] chars = "AA55A364002601FFD4C142313435390CAF".toCharArray();

System.out.println("chars:"+newString(chars));

System.out.println(chars[3]);

StringBuilder sb = newStringBuilder("");

byte[] bs = str.getBytes();

intbit;

for(inti = 0; i < bs.length; i++) {

bit = (bs[i] & 0x0f0) >> 4;

sb.append(chars[bit]);

bit = bs[i] & 0x0f;

sb.append(chars[bit]);

}

System.out.println(sb.toString().trim());

returnsb.toString().trim();

}

public staticString getHexstringToByteTest(){

String str = "AA";

byte[]data = new byte[1];

intaa= 0xAA;

data[0]=(byte) aa;

bytebase64_data[] = java.util.Base64.getEncoder().encode(data);

System.out.println(newString(base64_data));

String hex = HexUtil.encodeHexStr(str, CharsetUtil.CHARSET_UTF_8);

System.out.println(hex);

return null;

}

//public staticString getHexstringToByte(){

//AA5503640022000A D4 A5 41 38 38 38 38 38 39 01 53 52 AF// AA 55 03 64 00 22 00 0A D4 A5 41 38 38 38 38 38 39 01 53 52 AF正确播报报文bytedata[] = new byte[]{(byte)0xAA,0x55, (byte) 0x03,(byte) 0x64,(byte)0x00,0x22,(byte)0x00,(byte)0x0A,(byte)0xD4,(byte)0xA5,0x41,0x38,0x38,0x38,(byte)0x38,0x38,0x39,0X01,0X53,0X52,(byte)0xAF};

//[2, 8, 109, 90, 2, 36, 2, 19, 3]//

bytedata1[] = new byte[]{(byte)2,8, (byte) 109,(byte) 90,2,36,2,(byte)19,(byte)3};

String base64_data1 = Base64.encode(data1);

System.out.println("21312321===="+base64_data1);

bytebase64_data[] = java.util.Base64.getEncoder().encode(data);

String encode1 = Base64.encode(data);

String base64_str = newString(base64_data);

System.out.println("base64_str:"+base64_str);

System.out.println("encode1:"+encode1);

// String encode4 = Base64.encode( "AA55A364002601FFD4C142313435390CAF");// System.out.println(encode4);return null;

}

/***该工具是把16进制字符串转为16进制数据*@paramhex*@return*/public static byte[] hexString2Bytes(String hex) {

if((hex == null) || (hex.equals(""))){

return null;

}

else if(hex.length()%2!= 0){

return null;

}

else{

hex = hex.toUpperCase();

intlen = hex.length()/2;

byte[] b = new byte[len];

char[] hc = hex.toCharArray();

for(inti=0; i

intp=2*i;

b[i] = (byte) (charToByte(hc[p]) << 4| charToByte(hc[p+1]));

}

returnb;

}

/***该工具是把16进制字符串转为16进制，然后转为base64编码*@paramhex*@return*/public staticString hexStringToBytesToBase64(String hex) {

if((hex == null) || (hex.equals(""))){

return null;

}

else if(hex.length()%2!= 0){

return null;

}

else{

hex = hex.toUpperCase();

intlen = hex.length()/2;

byte[] b = new byte[len];

char[] hc = hex.toCharArray();

for(inti=0; i

intp=2*i;

b[i] = (byte) (charToByte(hc[p]) << 4| charToByte(hc[p+1]));

}

String encode1 = Base64.encode(b);

returnencode1;

}

private static bytecharToByte(charc) {

return(byte) "0123456789ABCDEF".indexOf(c);

}

public staticString decode(String s) {

if(s == null)

return null;

BASE64Decoder decoder = newBASE64Decoder();

try{

byte[] b = decoder.decodeBuffer(s);

return newString(b,"GBK");

} catch(Exception e) {

return null;

}

private static final char[] DIGITS= {'0', '1', '2', '3', '4', '5', '6', '7',

'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};

public static finalString toHex(byte[] data) {

finalStringBuffer sb = newStringBuffer(data.length* 2);

for(inti = 0; i < data.length; i++) {

sb.append(DIGITS[(data[i] >>> 4) & 0x0F]);

sb.append(DIGITS[data[i] & 0x0F]);

}

returnsb.toString();

}

public static voidmain(String[] args) {

// System.out.println(HexstringToByteUtil.str2HexStr("AA55A364002601FFD4C142313435390CAF"));

// byte b = Convert.ToByte(s, 16);用这个对接臻识485字符串数据转base64/* byte[] aa = HexstringToByteUtil.hexString2Bytes("AA55A364002601FFD4C142313435390CAF");String encode1 = Base64.encode(aa);System.out.println(encode1);*/

//getHexstringToByte();// System.out.println( HexstringToByteUtil.decode("AghtWgIkAhMD"));

/*String guid = "AA55036400";byte[] decoded = Base64.decode(guid);System.out.println(toHex(decoded));*/

/* //16进制字符串转base64byte[] xx= HexstringToByteUtil.hexString2Bytes("AA5503640022000AD4A541383838383839015352AF");String encode1 = Base64.encode(xx);System.out.println(encode1);*///Base64转byte[]，再转16进制字符串String guid = "qlUDZAAiAAnUpUNGMDAzWCiCPK8=";

byte[] decoded = java.util.Base64.getDecoder().decode(guid);

System.out.println(toHex(decoded));

}