Help with utf8

I read a file encode as utf8, and it has accented characters displayed
as R=C3=A9mi (in gvim).

I read and parse the file

File xmlFile is the file handler.

using:
 InputStreamReader in = new InputStreamReader(new FileInputStream
(xmlFile), "UTF-8");
filter.parse(new InputSource(new BufferedReader(in)));

When the parsing is done, I output the file with
Writer out = new OutputStreamWriter(new FileOutputStream(outfile),
"UTF-8");
filter.setContentHandler(new XMLWriter(out));

During the parsing, I substitute the attributes content using a
HashMap wich is read from another file with
FileInputStream r = new FileInputStream(d);
InputStreamReader is = new InputStreamReader(r);
System.out.println("Zmodif encoding " + is.getEncoding());
BufferedReader reader = new BufferedReader(is);
String line;
while ((line = reader.readLine())!= null){
    byte[] conv = line.getBytes("ISO-8859-1");
    String u8Line = new String(conv, "UTF8");
    ...
I put u8line in the HashMap and it to make the substitutions
}

My problem is that that output file has accented characters like this
Rémi instead of R=C3=A9mi
I don't know where it comes from and how to change it ...

Thanks for any help

Francois