How to get the site encoding?

Question

Java

BufferedReader body = new BufferedReader(new InputStreamReader(con.getInputStream(), "utf-8");
String tempLine, outString = "";
while ((tempLine = body.readLine()) != null)
     outString += tempLine + " ";
body.close();
return outString;

By default, I read the stream in utf-8 encoding, but sites with a different encoding may come across, how can I determine it if its name is not returned in Headers?
I tried to write a separate method and read the first line, extract the name of the encoding from the body of the document, but in this case body.readLine () displays the text not from the second line, but from the middle of the document, the picture shows that tempLine takes information clearly not from the next line :

Answer 1

The moment you receive a string, it is already stored in Java UTF-16 anyway. That is why the encoding is specified for the reader before reading begins.
With an already read line, if it was read in the wrong encoding and "corrupted", and the encoding is still unknown, nothing can be done.
In order to determine the source encoding of the site you are uploading, you must first get it not as a string, but as an array of bytes . After that, you can work with it and already determine the encoding either with the help of your crutches, or already existing strangers .

Answer 2

From the response header (responce header-a).