How to avoid encoding null (\u0000) when reading from InputStream

Question

I am reading a request body and put it into an input stream. While I am explicitly saying the decode method, I still get many \u0000 (Null) after the string.

InputStream is = exchange.getRequestBody();
byte[] header = new byte[100];
is.read(header);
String s = new String(header, "UTF-8");

How can I avoid this with Standard Java Library? I cannot use third party libraries.

Answer 1

is.read(header); returns the number of bytes that were actually read. Change your code as

byte[] header = new byte[100];
int n = is.read(header);
String s = new String(header, 0, n, "UTF-8");