如何在Java中将字节数组转换为十六进制字符串？
我有一个充满十六进制数的字节数组，用简单的方法打印它是毫无意义的，因为有许多不可打印的元素。我需要的是格式为：如何在Java中将字节数组转换为十六进制字符串？,java,bytearray,hex,Java,Bytearray,Hex,我有一个充满十六进制数的字节数组，用简单的方法打印它是毫无意义的，因为有许多不可打印的元素。我需要的是格式为：3a5f771c的确切十六进制代码。我在这里找到了三种不同的方法： 他还指出，最优雅的一个是： static final String HEXES = "0123456789ABCDEF"; public static String getHex( byte [] raw ) { if ( raw == null ) { return null; }
3a5f771cstatic final String HEXES = "0123456789ABCDEF";
public static String getHex( byte [] raw ) {
if ( raw == null ) {
return null;
}
final StringBuilder hex = new StringBuilder( 2 * raw.length );
for ( final byte b : raw ) {
hex.append(HEXES.charAt((b & 0xF0) >> 4))
.append(HEXES.charAt((b & 0x0F)));
}
return hex.toString();
}
import org.apache.commons.codec.binary.Hex;
String foo = "I am a string";
byte[] bytes = foo.getBytes();
System.out.println( Hex.encodeHexString( bytes ) );
private static final char[] HEX_ARRAY = "0123456789ABCDEF".toCharArray();
public static String bytesToHex(byte[] bytes) {
char[] hexChars = new char[bytes.length * 2];
for (int j = 0; j < bytes.length; j++) {
int v = bytes[j] & 0xFF;
hexChars[j * 2] = HEX_ARRAY[v >>> 4];
hexChars[j * 2 + 1] = HEX_ARRAY[v & 0x0F];
}
return new String(hexChars);
}
private static final char[]HEX_ARRAY=“0123456789ABCDEF”.tocharray（）；
公共静态字符串bytesToHex（字节[]字节）{
char[]hexChars=新字符[bytes.length*2]；
对于（int j=0；j>>4]；
hexChars[j*2+1]=十六进制数组[v&0x0F]；
}
返回新字符串（hexChars）；
}
private static final byte[] HEX_ARRAY = "0123456789ABCDEF".getBytes(StandardCharsets.US_ASCII);
public static String bytesToHex(byte[] bytes) {
byte[] hexChars = new byte[bytes.length * 2];
for (int j = 0; j < bytes.length; j++) {
int v = bytes[j] & 0xFF;
hexChars[j * 2] = HEX_ARRAY[v >>> 4];
hexChars[j * 2 + 1] = HEX_ARRAY[v & 0x0F];
}
return new String(hexChars, StandardCharsets.UTF_8);
}
private static final byte[]HEX_ARRAY=“0123456789ABCDEF”.getBytes（StandardCharsets.US_ASCII）；
公共静态字符串bytesToHex（字节[]字节）{
byte[]hexChars=新字节[bytes.length*2]；
对于（int j=0；j>>4]；
hexChars[j*2+1]=十六进制数组[v&0x0F]；
}
返回新字符串（hexChars、StandardCharsets.UTF_8）；
}
public static String byteArrayToHex(byte[] a) {
StringBuilder sb = new StringBuilder(a.length * 2);
for(byte b: a)
sb.append(String.format("%02x", b));
return sb.toString();
}
这个简单的单行线适合我
String result=new biginger（1，inputBytes）
编辑-使用此选项将删除前导零，但hey为我的用例工作。感谢@Voicu指出这一点//移动字节更有效
//你也可以用这个
public static String getHexString (String s)
{
byte[] buf = s.getBytes();
StringBuffer sb = new StringBuffer();
for (byte b:buf)
{
sb.append(String.format("%x", b));
}
return sb.toString();
}
以存储查找表的较小成本为代价，此实现简单且非常快速
private static final char[] BYTE2HEX=(
"000102030405060708090A0B0C0D0E0F"+
"101112131415161718191A1B1C1D1E1F"+
"202122232425262728292A2B2C2D2E2F"+
"303132333435363738393A3B3C3D3E3F"+
"404142434445464748494A4B4C4D4E4F"+
"505152535455565758595A5B5C5D5E5F"+
"606162636465666768696A6B6C6D6E6F"+
"707172737475767778797A7B7C7D7E7F"+
"808182838485868788898A8B8C8D8E8F"+
"909192939495969798999A9B9C9D9E9F"+
"A0A1A2A3A4A5A6A7A8A9AAABACADAEAF"+
"B0B1B2B3B4B5B6B7B8B9BABBBCBDBEBF"+
"C0C1C2C3C4C5C6C7C8C9CACBCCCDCECF"+
"D0D1D2D3D4D5D6D7D8D9DADBDCDDDEDF"+
"E0E1E2E3E4E5E6E7E8E9EAEBECEDEEEF"+
"F0F1F2F3F4F5F6F7F8F9FAFBFCFDFEFF").toCharArray();
;
public static String getHexString(byte[] bytes) {
final int len=bytes.length;
final char[] chars=new char[len<<1];
int hexIndex;
int idx=0;
int ofs=0;
while (ofs<len) {
hexIndex=(bytes[ofs++] & 0xFF)<<1;
chars[idx++]=BYTE2HEX[hexIndex++];
chars[idx++]=BYTE2HEX[hexIndex];
}
return new String(chars);
}
private static final char[]BYTE2HEX=(
“000102030405060708090A0B0C0D0E0F”+
“101112131415161718191A1B1C1D1E1F”+
“202122232425262728292A2B2C2D2E2F”+
“30313233343536373839393A3A3B3C3D3E3F”+
“404142434445464748494A4B4C4D4E4F”+
“505152535455565758595A5B5C5D5E5F”+
“606162636465666768696A6B6C6D6E6F”+
“707172737475767778797A7B7C7D7E7F”+
“808182838485868788898A8B8C8D8E8F”+
“909192939495969798999A9B9C9D9E9F”+
“A0A1A2A3A4A5A6A8A9AABACADAEAF”+
“B0B1B2B3B4B5B6B7B8B9BABBCBDBF”+
“C0C1C2C3C4C5C6C7C8C9CACBCCDCF”+
“D0D1D2D3D4D5D6D7D8D9DADBDCDDEDF”+
“E0E1E2E3E5E6E7E8E9EAebecedeef”+
“f0f1f2f3f4f6f7f8f9fafbfcfdfeff”）.tocharray（）；
;
公共静态字符串getHexString（字节[]字节）{
final int len=bytes.length；
final char[]chars=new char[len该方法是将byte[]
转换为十六进制字符串的方便方法。该类还包括许多其他有用的数据操作方法
在Java8和更早的版本中，JAXB是Java标准库的一部分。它是Java9和Java11的，作为将所有JavaEE包移动到它们自己的库中的努力的一部分。现在，javax.xml.bind
不存在，如果你想使用JAXB，它包含DatatypeConverter
，你需要安装我是马文的朋友
用法示例：
byte bytes[] = {(byte)0, (byte)0, (byte)134, (byte)0, (byte)61};
String hex = javax.xml.bind.DatatypeConverter.printHexBinary(bytes);
将导致：
00008603d
这个答案与。我通常使用下面的方法进行debuf语句，但我不知道这是否是最好的方法
private static String digits = "0123456789abcdef";
public static String toHex(byte[] data){
StringBuffer buf = new StringBuffer();
for (int i = 0; i != data.length; i++)
{
int v = data[i] & 0xff;
buf.append(digits.charAt(v >> 4));
buf.append(digits.charAt(v & 0xf));
}
return buf.toString();
}
我更喜欢这样：
final protected static char[] hexArray = "0123456789ABCDEF".toCharArray();
public static String bytesToHex(byte[] bytes, int offset, int count) {
char[] hexChars = new char[count * 2];
for ( int j = 0; j < count; j++ ) {
int v = bytes[j+offset] & 0xFF;
hexChars[j * 2] = hexArray[v >>> 4];
hexChars[j * 2 + 1] = hexArray[v & 0x0F];
}
return new String(hexChars);
}
final protected static char[]hexArray=“0123456789ABCDEF.tocharray（）；
公共静态字符串bytesToHex（字节[]字节，整数偏移量，整数计数）{
char[]hexChars=新字符[count*2]；
对于（int j=0；j>>4]；
hexChars[j*2+1]=hexArray[v&0x0F]；
}
返回新字符串（hexChars）；
}
这是对公认答案的稍微灵活的改编。
就我个人而言，我保留了被接受的答案和这个重载，可以在更多的上下文中使用。是@maybewcouldstealavan提出的解决方案的一个小变体，它可以让您在输出十六进制字符串中直观地捆绑N个字节：
final static char[]HEX_ARRAY=“0123456789ABCDEF.tocharray（）；
最终静态字符束_SEP=''；
公共静态字符串bytesToHexString（字节[]字节，int bundleSize/*[字节]*/]））{
char[]hexChars=新字符[（bytes.length*2）+（bytes.length/bundleSize）]；
对于（int j=0，k=1；j>>4]；
hexChars[start+1]=十六进制数组[v&0x0F]；
如果（（k%bundleSize）==0）{
hexChars[start+2]=捆绑设备的SEP；
}
}
返回新字符串（hexChars）.trim（）；
}
即:
bytesToHexString（“…DOOM..”.tocharray（）.getBytes（），2）；
2E2E 444F 4F4D 2E2E
bytesToHexString（“…DOOM..”.toCharArray（）.getBytes（），4）；
2E2E444F 4F4D2E2E
这个怎么样
String byteToHex(final byte[] hash)
{
Formatter formatter = new Formatter();
for (byte b : hash)
{
formatter.format("%02x", b);
}
String result = formatter.toString();
formatter.close();
return result;
}
如果您正在为python寻找与此完全相同的字节数组，我已经将此Java实现转换为python
class ByteArray:
@classmethod
def char(cls, args=[]):
cls.hexArray = "0123456789ABCDEF".encode('utf-16')
j = 0
length = (cls.hexArray)
if j < length:
v = j & 0xFF
hexChars = [None, None]
hexChars[j * 2] = str( cls.hexArray) + str(v)
hexChars[j * 2 + 1] = str(cls.hexArray) + str(v) + str(0x0F)
# Use if you want...
#hexChars.pop()
return str(hexChars)
array = ByteArray()
print array.char(args=[])
类字节数组：
@类方法
def char（cls，args=[]）：
cls.hexArray=“0123456789ABCDEF”。编码（'utf-16
import com.google.common.io.BaseEncoding;
...
byte[] bytes = "Hello world".getBytes(StandardCharsets.UTF_8);
final String hex = BaseEncoding.base16().lowerCase().encode(bytes);
md5sum = String.format("%032x", new BigInteger(1, md.digest()));
public static byte[] hexStringToByteArray(String s) {
int len = s.length();
byte[] data = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
+ Character.digit(s.charAt(i+1), 16));
}
return data;
}
import java.util.Arrays;
public class Base16/* a.k.a. Hex */ {
public static class Encoder{
private static char[] toLowerHex={'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
private static char[] toUpperHex={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
private boolean upper;
public Encoder(boolean upper) {
this.upper=upper;
}
public String encode(byte[] data){
char[] value=new char[data.length*2];
char[] toHex=upper?toUpperHex:toLowerHex;
for(int i=0,j=0; i<data.length; i++){
int octet=data[i]&0xFF;
value[j++]=toHex[octet>>4];
value[j++]=toHex[octet&0xF];
}
return new String(value);
}
static final Encoder LOWER_CASE=new Encoder(false);
static final Encoder UPPER_CASE=new Encoder(true);
}
public static Encoder getEncoder(){
return Encoder.LOWER_CASE;
}
public static Encoder getUpperEncoder(){
return Encoder.UPPER_CASE;
}
public static class Decoder{
private static int maxIndex=102;
private static int[] toIndex;
static {
toIndex=new int[maxIndex+1];
Arrays.fill(toIndex, -1);
char[] chars={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','a','b','c','d','e','f'};
for(int i=0; i<chars.length; i++) {
toIndex[(int)chars[i]]=i;
}
}
public Decoder() {
}
public byte[] decode(String str) {
char[] value=str.toCharArray();
int start=0;
if(value.length>2 && value[0]=='0' && (value[1]=='x' || value[1]=='X')) {
start=2;
}
int byteLength=(value.length-start)/2; // ignore trailing odd char if exists
byte[] data=new byte[byteLength];
for(int i=start,j=0;i<value.length;i+=2,j++){
int i1;
int i2;
char c1=value[i];
char c2=value[i+1];
if(c1>maxIndex || (i1=toIndex[(int)c1])<0 || c2>maxIndex || (i2=toIndex[(int)c2])<0) {
throw new IllegalArgumentException("Invalid character at "+i);
}
data[j]=(byte)((i1<<4)+i2);
}
return data;
}
static final Decoder IGNORE_CASE=new Decoder();
}
public static Decoder getDecoder(){
return Decoder.IGNORE_CASE;
}
}
private static String bytesToHexString(byte[] bytes, int length) {
if (bytes == null || length == 0) return null;
StringBuilder ret = new StringBuilder(2*length);
for (int i = 0 ; i < length ; i++) {
int b;
b = 0x0f & (bytes[i] >> 4);
ret.append("0123456789abcdef".charAt(b));
b = 0x0f & bytes[i];
ret.append("0123456789abcdef".charAt(b));
}
return ret.toString();
}
import java.math.BigInteger;
import static java.lang.System.out;
public final class App2 {
// | proposed solution.
public static String encode(byte[] bytes) {
final int length = bytes.length;
// | BigInteger constructor throws if it is given an empty array.
if (length == 0) {
return "00";
}
final int evenLength = (int)(2 * Math.ceil(length / 2.0));
final String format = "%0" + evenLength + "x";
final String result = String.format (format, new BigInteger(bytes));
return result;
}
public static void main(String[] args) throws Exception {
// 00
out.println(encode(new byte[] {}));
// 01
out.println(encode(new byte[] {1}));
//203040
out.println(encode(new byte[] {0x20, 0x30, 0x40}));
// 416c6c20796f75722062617365206172652062656c6f6e6720746f2075732e
out.println(encode("All your base are belong to us.".getBytes()));
}
}
public static String encode(byte[] bytes) {
final int length = bytes.length;
// | BigInteger constructor throws if it is given an empty array.
if (length == 0) {
return "00";
}
return new BigInteger(bytes).toString(16);
}
public static String bytesToHex(final byte[] bytes)
{
final int numBytes = bytes.length;
final char[] container = new char[numBytes * 2];
for (int i = 0; i < numBytes; i++)
{
final int b = bytes[i] & 0xFF;
container[i * 2] = Character.forDigit(b >>> 4, 0x10);
container[i * 2 + 1] = Character.forDigit(b & 0xF, 0x10);
}
return new String(container);
}
import org.springframework.security.crypto.codec.Hex
final String testString = "Test String";
final byte[] byteArray = testString.getBytes();
System.out.println(Hex.encode(byteArray));
Converts bytes data to hex characters
@param bytes byte array to be converted to hex string
@return byte String in hex format
private static String bytesToHex(byte[] bytes) {
char[] hexChars = new char[bytes.length * 2];
int v;
for (int j = 0; j < bytes.length; j++) {
v = bytes[j] & 0xFF;
hexChars[j * 2] = HEX_ARRAY[v >>> 4];
hexChars[j * 2 + 1] = HEX_ARRAY[v & 0x0F];
}
return new String(hexChars);
}
public class ByteHex {
public static int hexToByte(char ch) {
if ('0' <= ch && ch <= '9') return ch - '0';
if ('A' <= ch && ch <= 'F') return ch - 'A' + 10;
if ('a' <= ch && ch <= 'f') return ch - 'a' + 10;
return -1;
}
private static final String[] byteToHexTable = new String[]
{
"00", "01", "02", "03", "04", "05", "06", "07", "08", "09", "0A", "0B", "0C", "0D", "0E", "0F",
"10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "1A", "1B", "1C", "1D", "1E", "1F",
"20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "2A", "2B", "2C", "2D", "2E", "2F",
"30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "3A", "3B", "3C", "3D", "3E", "3F",
"40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "4A", "4B", "4C", "4D", "4E", "4F",
"50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "5A", "5B", "5C", "5D", "5E", "5F",
"60", "61", "62", "63", "64", "65", "66", "67", "68", "69", "6A", "6B", "6C", "6D", "6E", "6F",
"70", "71", "72", "73", "74", "75", "76", "77", "78", "79", "7A", "7B", "7C", "7D", "7E", "7F",
"80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "8A", "8B", "8C", "8D", "8E", "8F",
"90", "91", "92", "93", "94", "95", "96", "97", "98", "99", "9A", "9B", "9C", "9D", "9E", "9F",
"A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8", "A9", "AA", "AB", "AC", "AD", "AE", "AF",
"B0", "B1", "B2", "B3", "B4", "B5", "B6", "B7", "B8", "B9", "BA", "BB", "BC", "BD", "BE", "BF",
"C0", "C1", "C2", "C3", "C4", "C5", "C6", "C7", "C8", "C9", "CA", "CB", "CC", "CD", "CE", "CF",
"D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7", "D8", "D9", "DA", "DB", "DC", "DD", "DE", "DF",
"E0", "E1", "E2", "E3", "E4", "E5", "E6", "E7", "E8", "E9", "EA", "EB", "EC", "ED", "EE", "EF",
"F0", "F1", "F2", "F3", "F4", "F5", "F6", "F7", "F8", "F9", "FA", "FB", "FC", "FD", "FE", "FF"
};
private static final String[] byteToHexTableLowerCase = new String[]
{
"00", "01", "02", "03", "04", "05", "06", "07", "08", "09", "0a", "0b", "0c", "0d", "0e", "0f",
"10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "1a", "1b", "1c", "1d", "1e", "1f",
"20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "2a", "2b", "2c", "2d", "2e", "2f",
"30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "3a", "3b", "3c", "3d", "3e", "3f",
"40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "4a", "4b", "4c", "4d", "4e", "4f",
"50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "5a", "5b", "5c", "5d", "5e", "5f",
"60", "61", "62", "63", "64", "65", "66", "67", "68", "69", "6a", "6b", "6c", "6d", "6e", "6f",
"70", "71", "72", "73", "74", "75", "76", "77", "78", "79", "7a", "7b", "7c", "7d", "7e", "7f",
"80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "8a", "8b", "8c", "8d", "8e", "8f",
"90", "91", "92", "93", "94", "95", "96", "97", "98", "99", "9a", "9b", "9c", "9d", "9e", "9f",
"a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7", "a8", "a9", "aa", "ab", "ac", "ad", "ae", "af",
"b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7", "b8", "b9", "ba", "bb", "bc", "bd", "be", "bf",
"c0", "c1", "c2", "c3", "c4", "c5", "c6", "c7", "c8", "c9", "ca", "cb", "cc", "cd", "ce", "cf",
"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", "d8", "d9", "da", "db", "dc", "dd", "de", "df",
"e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7", "e8", "e9", "ea", "eb", "ec", "ed", "ee", "ef",
"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", "f8", "f9", "fa", "fb", "fc", "fd", "fe", "ff"
};
public static String byteToHex(byte b){
return byteToHexTable[b & 0xFF];
}
public static String byteToHex(byte[] bytes){
if(bytes == null) return null;
StringBuilder sb = new StringBuilder(bytes.length*2);
for(byte b : bytes) sb.append(byteToHexTable[b & 0xFF]);
return sb.toString();
}
public static String byteToHex(short[] bytes){
StringBuilder sb = new StringBuilder(bytes.length*2);
for(short b : bytes) sb.append(byteToHexTable[((byte)b) & 0xFF]);
return sb.toString();
}
public static String byteToHexLowerCase(byte[] bytes){
StringBuilder sb = new StringBuilder(bytes.length*2);
for(byte b : bytes) sb.append(byteToHexTableLowerCase[b & 0xFF]);
return sb.toString();
}
public static byte[] hexToByte(String hexString) {
if(hexString == null) return null;
byte[] byteArray = new byte[hexString.length() / 2];
for (int i = 0; i < hexString.length(); i += 2) {
byteArray[i / 2] = (byte) (hexToByte(hexString.charAt(i)) * 16 + hexToByte(hexString.charAt(i+1)));
}
return byteArray;
}
public static byte hexPairToByte(char ch1, char ch2) {
return (byte) (hexToByte(ch1) * 16 + hexToByte(ch2));
}
}
| Name (ops/s) | 16 byte | 32 byte | 128 byte | 0.95 MB |
|----------------------|-----------:|-----------:|----------:|--------:|
| Opt1: BigInteger | 2,088,514 | 1,008,357 | 133,665 | 4 |
| Opt2/3: Bytes Lib | 20,423,170 | 16,049,841 | 6,685,522 | 825 |
| Opt4: Apache Commons | 17,503,857 | 12,382,018 | 4,319,898 | 529 |
| Opt5: Guava | 10,177,925 | 6,937,833 | 2,094,658 | 257 |
| Opt6: Spring | 18,704,986 | 13,643,374 | 4,904,805 | 601 |
| Opt7: BC | 7,501,666 | 3,674,422 | 1,077,236 | 152 |
| Opt8: JAX-B | 13,497,736 | 8,312,834 | 2,590,940 | 346 |
byte[] theValue = .....
String hexaString = new BigInteger(1, theValue).toString(16);
private static String toHexString(byte[] bytes) {
return IntStream.range(0, bytes.length)
.mapToObj(i -> String.format("%02X", bytes[i]))
.collect(Collectors.joining());
}
public static String toHexString(byte[] bytes) {
StringBuilder sb = new StringBuilder();
if (bytes != null)
for (byte b:bytes) {
final String hexString = Integer.toHexString(b & 0xff);
if(hexString.length()==1)
sb.append('0');
sb.append(hexString);//.append(' ');
}
return sb.toString();//.toUpperCase();
}
public String toHexString(byte... bytes) {
return Optional.ofNullable(bytes)
.filter(bs->bs.length>0)
.map(DatatypeConverter::printHexBinary)
.map(str->IntStream.range(0, str.length())
.filter(i->(i%2)==0) // take every second index
.mapToObj(i->"0x" + str.substring(i, i+2))
.collect(Collectors.joining(" ")))
.orElse("");
}