Java: Lire un Fichier encodé en UTF-8

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 int,string,char,static, url, socket, url, socket, java
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    private StringBuilder readFile(String nomFichier)
    {
 
        StringBuilder str=new StringBuilder();
        try
        {   BufferedReader br = new BufferedReader(new InputStreamReader(new 
      java.io.FileInputStream(nomFichier), "utf8"));
              String ligne = null;
 
              while ((ligne = br.readLine()) != null)
              {
                  str.append(ligne);
              }
 
        }catch(Exception err)
        {
            //JOptionPane.showMessageDialog(null,err);
        }
        return str;
    }