how to change code so it works with itext 7 - itext

Question

The following code works nicely with iText 5:
LEVEL = PdfAConformanceLevel.PDF_A_3A
writer = PdfAWriter.getInstance(document, baos, LEVEL)
What is the correct syntax for iText 7?
Where can I find examples and documentation about iText 7?

Answer 1

why so negative? Seems like you want to put extra pressure on me to write documentation. That's kind of frustrating. I think that encouragement works better. Nevertheless, your claim that there's no documentation is wrong.
See Chapter 7: Creating PDF/UA and PDF/A documents of the iText 7: Jump-Start Tutorial
You overlooked the UnitedStates_PDFA_3a example in which we have a CSV file that we convert to a PDF/A-3 document adding that CSV file as attachment.
public void createPdf(String dest) throws IOException, XMPException {
PdfADocument pdf = new PdfADocument(new PdfWriter(dest),
PdfAConformanceLevel.PDF_A_3A,
new PdfOutputIntent("Custom", "", "http://www.color.org",
"sRGB IEC61966-2.1", new FileInputStream(INTENT)));
Document document = new Document(pdf, PageSize.A4.rotate());
document.setMargins(20, 20, 20, 20);
//Setting some required parameters
pdf.setTagged();
pdf.getCatalog().setLang(new PdfString("en-US"));
pdf.getCatalog().setViewerPreferences(
new PdfViewerPreferences().setDisplayDocTitle(true));
PdfDocumentInfo info = pdf.getDocumentInfo();
info.setTitle("iText7 PDF/A-3 example");
//Add attachment
PdfDictionary parameters = new PdfDictionary();
parameters.put(PdfName.ModDate, new PdfDate().getPdfObject());
PdfFileSpec fileSpec = PdfFileSpec.createEmbeddedFileSpec(
pdf, Files.readAllBytes(Paths.get(DATA)), "united_states.csv",
"united_states.csv", new PdfName("text/csv"), parameters,
PdfName.Data, false);
fileSpec.put(new PdfName("AFRelationship"), new PdfName("Data"));
pdf.addFileAttachment("united_states.csv", fileSpec);
PdfArray array = new PdfArray();
array.add(fileSpec.getPdfObject().getIndirectReference());
pdf.getCatalog().put(new PdfName("AF"), array);
//Embed fonts
PdfFont font = PdfFontFactory.createFont(FONT, true);
PdfFont bold = PdfFontFactory.createFont(BOLD_FONT, true);
// Create content
Table table = new Table(new float[]{4, 1, 3, 4, 3, 3, 3, 3, 1});
table.setWidthPercent(100);
BufferedReader br = new BufferedReader(new FileReader(DATA));
String line = br.readLine();
process(table, line, bold, true);
while ((line = br.readLine()) != null) {
process(table, line, font, false);
}
br.close();
document.add(table);
//Close document
document.close();
}
public void process(Table table, String line, PdfFont font, boolean isHeader) {
StringTokenizer tokenizer = new StringTokenizer(line, ";");
while (tokenizer.hasMoreTokens()) {
if (isHeader) {
table.addHeaderCell(new Cell().setHorizontalAlignment(HorizontalAlignment.CENTER).add(new Paragraph(tokenizer.nextToken()).setHorizontalAlignment(HorizontalAlignment.CENTER).setFont(font)));
} else {
table.addCell(new Cell().setHorizontalAlignment(HorizontalAlignment.CENTER).add(new Paragraph(tokenizer.nextToken()).setHorizontalAlignment(HorizontalAlignment.CENTER).setFont(font)));
}
}
}