Convert Java string to byte array
Solution 1
You used array.toString()
, which is implemented like this:
return "[B@" + Integer.toString(this.hashCode(), 16);
(In fact it inherits the definition from Object, and the part before the @
simply is the result of getClass().getName()
.)
And the hashCode here does not depend on the content.
Instead, use new String(array, encoding).
Of course, this only works for byte-arrays which are really representable as Java strings (which then contain readable characters), not for arbitrary arrays. There better use base64 like Bozho recommended (but make sure to use it on both sides of the channel).
Solution 2
This looks like Base64. Take a look at commons-codec Base64
class.
Solution 3
You can't just use getBytes() on two different machines, since getBytes uses the plattform's default charset.
Decode and encode the array with a specified charset (i.e. UTF-8) to make sure you get the correct results.
Solution 4
First do convertion of your byte array to proper string, by doing
String line= new String(Arrays.toString(your_array))
Then send it and use function below
public static byte[] StringToByteArray(String line)
{
String some=line.substring(1, line.length()-1);
int element_counter=1;
for(int i=0; i<some.length(); i++)
{
if (some.substring(i, i+1).equals(","))
{
element_counter++;
}
}
int [] comas =new int[element_counter-1];
byte [] a=new byte[element_counter];
if (a.length==1)
{
a[0]= Byte.parseByte(some.substring(0));
}
else
{
int j=0;
for (int i = 0; i < some.length(); i++)
{
if (some.substring(i, i+1).equals(","))
{
comas[j]=i;
j++;
}
}
for (int i=0; i<element_counter; i++)
{
if(i==0)
{
a[i]=Byte.parseByte(some.substring(0, comas[i]));
}
else if (i==element_counter-1)
{
a[i]=Byte.parseByte(some.substring(comas[comas.length-1]+2));
}
else
{
a[i]=Byte.parseByte(some.substring(comas[i-1]+2, comas[i]));
}
}
}
return a;
}
Mitch
Updated on July 11, 2020Comments
-
Mitch almost 4 years
I have a byte array which I'm encrypting then converting to a string so it can be transmitted. When I receive the string I then have to convert the string back into a byte array so it can be decrypted. I have checked that the received string matches the sent string (including length) but when I use something like str.getBytes() to convert it to a byte array, it does not match my original byte array.
example output:
SENT: WzShnf/fOV3NZO2nqnOXZbM1lNwVpcq3qxmXiiv6M5xqC1A3 SENT STR: [B@3e4a9a7d RECEIVED STR: [B@3e4a9a7d RECEIVED: W0JAM2U0YTlhN2Q=
any ideas how i can convert the received string to a byte array which matches the sent byte array?
Thanks
-
Mitch about 13 yearsI did try using the sun.misc.BASE64Decoder which i believe is very similar and it didnt seem to work for me
-
Bozho about 13 years@Mitch try
string.getBytes("ISO-8859-1")
, and then passing that as constructor arugment as well. -
mdrg about 13 years@Mitch do not use any class from
sun.*
packages. They are proprietary API and may be removed at any time. Use any other public implementation, like the one suggested by Bozho. -
Mitch about 13 yearsThanks, this was a quick solution to the problem