jxl genera sobresalir

dependencia maven

        <dependency>
            <groupId>org.jxls</groupId>
            <artifactId>jxls</artifactId>
        </dependency>
        <dependency>
            <groupId>org.jxls</groupId>
            <artifactId>jxls-poi</artifactId>
        </dependency>
        <dependency>
            <groupId>org.jxls</groupId>
            <artifactId>jxls-jexcel</artifactId>
        </dependency>
        <dependency>
            <groupId>org.jxls</groupId>
            <artifactId>jxls-reader</artifactId>
        </dependency>
        <dependency>
            <groupId>net.sourceforge.jexcelapi</groupId>
            <artifactId>jxl</artifactId>
            <version>2.6.12</version>
        </dependency>

Código

/**
     *
     * @param response response
     * @param template template name
           * @param contextMap context dictionary
           * @param downloadFilename display name after download
     */
    public void doDownloadExcel(HttpServletResponse response,
                                 String template,
                                 Map<String, Object> contextMap,
                                 String downloadFilename) {
        try (InputStream inputStream = getClass().getClassLoader().getResourceAsStream("static/excel/" + template)) {
            response.setContentType("application/octet-stream;charset=UTF-8");
            response.setCharacterEncoding("UTF-8");
            response.setHeader("Content-Disposition", "attachment;filename=" +
                    new String(downloadFilename.getBytes(), StandardCharsets.ISO_8859_1) + ".xls");

            OutputStream outputStream = response.getOutputStream();
            Context context = new Context();
            contextMap.forEach(context::putVar);
            JxlsHelper.getInstance().processTemplate(inputStream, outputStream, context);
        } catch (Exception e) {
            log.error("[download] error ", e);
        }
    }