Erro no Ç

Programação Java
#1

Pessoal, esse é um pedaço do meu servlet que faz dar dowmload de um arquivo que ele monta… so que quando abro o arquivo ele atrapalha o ^Ç~ ficando todo doido. alguem ajuda ai?

public class download extends HttpServlet {

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException, SafoException  {
    Hashtable data = ContentManager.getInstance().processRequest(request);
    int codArquivo = Integer.parseInt((String)data.get("codArquivo"));
    ArquivoSiafi as = new ArquivoSiafi();
    as.setCod(codArquivo);
    as = new ArquivoSiafiDAO().selectArquivoSiafi(as);
    
    FileInputStream fileInput = null;
    try {
        ReadWriteTextFile t = new ReadWriteTextFile();
        
        String filename = as.getNomArquivoOriginal();
        File f = new File(filename);
        f.createNewFile();
        t.setContents(f,this.getInputStreamValue(as.getArquivoIS()));
        
        byte[] content = null;
        int fileLength = (int) f.length();
        fileInput = new FileInputStream(f);
        BufferedInputStream bufferedInput = new BufferedInputStream(fileInput);
        content = new byte[fileLength];
        bufferedInput.read(content, 0, fileLength);
        bufferedInput.close();
        response.addHeader( "Content-Disposition",
                "attachment; filename=" + f.getName());
        response.setContentType( "application/download" );
        
        ServletOutputStream outStream = response.getOutputStream();
        
        // envia o conteúdo do arquivo para o stream de resposta
        try {
            outStream.write( content );
            outStream.flush();
        } finally {
            outStream.close();
        }
        
    } catch (Exception e){
        e.printStackTrace();
    } finally {
        if (fileInput != null) {
            fileInput.close();
        }
    }
    
}
   
public String getInputStreamValue(InputStream is) throws Exception {
    byte[] b = null;
    StringBuffer sbuf = null;
    int numRead;
    int j = 0;
    if(is != null) {
        sbuf = new StringBuffer(65535);
        b = new byte[10000];
        
        numRead = is.read(b);
        while(numRead > 0) {
            for(j = 0; j < numRead; ++j) {
                sbuf.append((char)b[j]);
            }
            numRead = is.read(b);
        }
    }
    is.close();
    
    return sbuf.toString();
}

}

#2