How to convert hex strings to byte values in Java

Question

I have a String array  I want to convert it to byte array  I use the Java program  For example   String str       aa    55      convert to   byte new       byte 0xaa   byte 0x55     What can I do

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The simplest way  using Apache Common Codec    byte   bytes   Hex decodeHex str toCharArray

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Looking at the sample I guess you mean that a string array is actually an array of HEX representation of bytes  don t you   If yes  then for each string item I would do the following    check that a string consists only of 2 characters these chars are in  0    9  or  a    f  interval  take their case into account as well  convert each character to a corresponding number  subtracting code value of  0  or  a  build a byte value  where first char is higher bits and second char is lower ones  E g   int byteVal    firstCharNumber  lt  lt  4    secondCharNumber

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Convert string to Byte-Array   byte   theByteArray   stringToConvert getBytes      Convert String to Byte    String str    aa     byte b   Byte valueOf str

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You can try something similar to this    String s    65    byte value   Byte valueOf s     Use the Byte ValueOf   method for all the elements in the String array to convert them into Byte values

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A long way to go     I am not aware of methods to get rid of long for statements  ArrayList lt Byte gt  bList   new ArrayList lt Byte gt     for String ss   str        byte   bArr   ss getBytes        for Byte b   bArr            bList add b             if you still need an array byte   bArr   new byte bList size     for int i 0  i lt bList size    i          bArr i    bList get i

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String str    Your string    byte   array   str getBytes

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String source    testString   byte   byteArray   source getBytes encoding      You can foreach and do the same with all the strings in the array

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Since there was no answer for hex string to single byte conversion  here is mine   private static byte hexStringToByte String data        return  byte    Character digit data charAt 0   16   lt  lt  4                      Character digit data charAt 1   16        Sample usage   hexStringToByte  aa       170 hexStringToByte  ff       255 hexStringToByte  10       16     Or you can also try the Integer parseInt String number  int radix  imo  is way better than others      first parameter is a number represented in string    second is the radix or the base number system to be use Integer parseInt  de   16      222 Integer parseInt  ad   16      173 Integer parseInt  c9   16      201

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String str       aa    55     byte b     new byte str length    for  int i   0  i  lt  str length  i          b i     byte  Integer parseInt str i   16       Integer parseInt string  radix  converts a string into an integer  the radix paramter specifies the numeral system   Use a radix of 16 if the string represents a hexadecimal number  Use a radix of 2 if the string represents a binary number  Use a radix of 10  or omit the radix paramter  if the string represents a decimal number   For further details check the Java docs  https   docs oracle com javase 7 docs api java lang Integer html parseInt java lang String  20int

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Here  if you are converting string into byte   There is a utility code        String   str   result replaceAll            replaceAll           split            byte   dataCopy   new byte str length        int i 0      for String s str             dataCopy i  Byte valueOf s           i              return dataCopy

[java] How to convert hex strings to byte values in Java

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