How to Write a file from hex format to another format

hi I am trying to create a file (IBM AFP-printer format) from the hex file which i have created after reading that IBM afp file. Now i have to do some changes in that hex file data and store it back to the same format.
I have tryed storing it using:
Writer out = new OutputStreamWriter(outputStream,"Cp1252");
but it is taking hex format only.
I have checked encoding of afp file by this code
File inputFile = new File( "C:\\ACode\\new2.afp" ) ;
FileInputStream inputStream = new FileInputStream(inputFile );
InputStreamReader in = new InputStreamReader(inputStream);
System.out.println(in.getEncoding());
it is showing Cp1252 only.
But i am unable to store it back to same format
Thanks

I don't really know what the IBM APF stream format is, but I suspect that your approach is not right. If you really want to read and write raw hex bytes, then do not use readers and writers; instead use pure streams. The reason is that readers and writers are designed to deal with character-oriented data, and will automatically perform translations on input and output.
On the other hand, if you could find the correct encoding/decoding software for the IBM format in question, well then readers/writers would be fine, and you could do all of your "internal" work in unicode.

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