private static final String OUTPUT_FILE = "report.pdf";
private static final String UTF_8 = "UTF-8";

@Autowired
private AgfService service;

@Autowired
private DateUteisComponent dataUtil;

public OutputStream generatePdf(Object dataReport, String template) throws Exception {

    String renderedHtmlContent = generateHtml(dataReport, template);
    String xHtml = convertToXhtml(renderedHtmlContent);

    ITextRenderer renderer = new ITextRenderer();
    renderer.getFontResolver().addFont("template/Code39.ttf", IDENTITY_H, EMBEDDED);

    String baseUrl = FileSystems.getDefault().getPath("src", "main", "resources").toUri().toURL().toString();
    renderer.setDocumentFromString(xHtml, baseUrl);
    renderer.layout();
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    renderer.createPDF(outputStream);
    outputStream.close();
    return outputStream;
}

private String convertToXhtml(String html) throws UnsupportedEncodingException {
    Tidy tidy = new Tidy();
    tidy.setInputEncoding(UTF_8);
    tidy.setOutputEncoding(UTF_8);
    tidy.setXHTML(true);
    ByteArrayInputStream inputStream = new ByteArrayInputStream(html.getBytes(UTF_8));
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    tidy.parseDOM(inputStream, outputStream);
    return outputStream.toString(UTF_8);
}

public String generateHtml(Object dataReport, String template) {
    ClassLoaderTemplateResolver templateResolver = new ClassLoaderTemplateResolver();
    templateResolver.setPrefix("/");
    templateResolver.setSuffix(".html");
    templateResolver.setTemplateMode(HTML);
    templateResolver.setCharacterEncoding(UTF_8);

    TemplateEngine templateEngine = new TemplateEngine();
    templateEngine.setTemplateResolver(templateResolver);

    Date instanteAtual = new Date();
    String[] instanteAtualF = dataUtil.formatDateInstant(instanteAtual);

    Context context = new Context();
    context.setVariable("instante", instanteAtualF);
    context.setVariable("data", dataReport);

    String renderedHtmlContent = templateEngine.process(template, context);

    return renderedHtmlContent;
}`

public OutputStream gerarRelatorioPrePostagemPorEstadoPdf(String estado) throws Exception {
    List<PrePostagemBean> prePostagensBeans = generateDataForReportForUf(estado);
    ByteArrayOutputStream outputStream = (ByteArrayOutputStream) this.generatePdfService.generatePdf(prePostagensBeans, "template/templateE");
    this.sendConfirmationHtmlEmail(outputStream.toByteArray());
    return outputStream;
}

@GetMapping(value = "agfs/{estado}/pdf", produces = "application/pdf")
public ResponseEntity<?> prepostReportEstadoPdf(@PathVariable("estado") String estado) throws Exception {
    ByteArrayOutputStream os = (ByteArrayOutputStream) this.agfService.gerarRelatorioPrePostagemPorEstadoPdf(estado);
    byte[] content = os.toByteArray();
    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_PDF);
    ResponseEntity<byte[]> response = new ResponseEntity<byte[]>(content, headers, HttpStatus.OK);
    return response;
}