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Center and format text with OpenPDF

I created a PDF file in Java using OpenPDF and inserted a paragraph. The problem is that I want to place it in the middle, not on the left. How can this be done?
Second question: How can I place a word with specific formatting in the test?
For example: "Hello and welcome" (welcome should be bold)
This is my code:
Document document = new Document();
String PDFPath = "output.pdf";
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(PDFPath));
Font font_bold = new Font(Font.TIMES_ROMAN, 16, Font.BOLD, Color.BLACK);
Font font_normal = new Font(Font.TIMES_ROMAN, 15, Font.NORMAL, Color.BLACK);
Paragraph p1 = new Paragraph("Ordonnance", font_bold);
document.open();
document.add(p1);
document.close();

You need to define the alignment if you want to have the paragraph centred:
p1.setAlignment(Element.ALIGN_CENTER);
To apply formatting to some parts of the text, you can divide it into several chunks. A Chunk in OpenPDF is a string with a certain Font. Instead of adding a String (unformatted) to the paragraph, you add a Chunk-object like new Chunk("Hello and ", fontNormal) which defines the text and the font to be used.
Here is the code for what you want to do according to the question:
Document document = new Document();
PdfWriter.getInstance(document, new FileOutputStream("output.pdf"));
document.open();
Font fontNormal = new Font(Font.TIMES_ROMAN, 15, Font.NORMAL);
Font fontBold = new Font(Font.TIMES_ROMAN, 16, Font.BOLD);
Paragraph p1 = new Paragraph();
p1.setAlignment(Element.ALIGN_CENTER);
p1.add(new Chunk("Hello and ", fontNormal));
p1.add(new Chunk("welcome", fontBold));
document.add(p1);
document.close();
The result looks like this:

Your first line had some weird declaration, but this should work:
Document document = new Document();
String PDFPath = "D:\\test.pdf";
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(PDFPath));
Font font_bold = new Font(Font.TIMES_ROMAN, 16, Font.BOLD, Color.BLACK);
Font font_normal = new Font(Font.TIMES_ROMAN, 15, Font.NORMAL, Color.BLACK);
Paragraph p1 = new Paragraph("Ordonnance", font_bold);
p1.setAlignment(Element.ALIGN_CENTER);
document.open();
document.add(p1);
document.close();
You just have to set the alignment of the paragraph

How to display Arabic in PDF created using iText in android

I am using iText 5.5.10 to create a PDF. When I use English words it works fine, but when I use Arabic words it shows empty lines.
What is the problem, and how can I solve it? Thanks in advance.
public void createPDF1(View view) throws IOException, DocumentException {
// BaseFont urName = BaseFont.createFont("assets/subFolder/fontName.TTF", "UTF-8",BaseFont.EMBEDDED);
// Font urFontName = new Font(urName, 12);
Font font = FontFactory.getFont("Simplified Arabic", BaseFont.IDENTITY_H, true, 22, Font.BOLD);
EditText et=(EditText)findViewById(R.id.txt_input);
BaseFont ArialBase = BaseFont.createFont("assets/tahoma.ttf", BaseFont.IDENTITY_H, true);
Font ArialFont = new Font(ArialBase, 20);
// Font f = FontFactory.getFont(FONT, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
Font chapterFont = FontFactory.getFont("assets/arialuni.ttf", BaseFont.IDENTITY_H, 16, Font.BOLDITALIC);
Font f=new Font(Font.FontFamily.TIMES_ROMAN,50.0f,Font.UNDERLINE,BaseColor.RED);
Document document = new Document();
String outpath= Environment.getExternalStorageDirectory()+"/mypdf1.pdf";
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(outpath));
document.open();
Phrase p = new Phrase("This is incorrect:احمد",ArialFont);
p.add(new Chunk("احمد",ArialFont));
p.add(new Chunk(": 50.00 USD"));
document.add(p);
p = new Phrase("This is correct: ");
p.add(new Chunk("#"+et.getText().toString(),chapterFont));
p.add(new Phrase(": 50.00"));
ColumnText canvas = new ColumnText(writer.getDirectContent());
canvas.setSimpleColumn(36, 750, 559, 780);
canvas.setRunDirection(PdfWriter.RUN_DIRECTION_LTR);
canvas.addElement(p);
canvas.go();
document.close();
}
I have tried the suggestions in this post, but it doesn't work.

How to apply different font to Paragraph and Chunk in PDFCell in iText

I need your help in applying different font styles to both Paragraph and Chunk in a PDFCell. My code is as below:
BaseFont bf = BaseFont.createFont("c://windows//fonts//arial.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
Font font = new Font(bf, 16);
Font welcomeFont = new Font(Font.TIMES_ROMAN, 20,Font.UNDERLINE | Font.BOLD);
Chunk welcomeText = new Chunk("WelCome ", welcomeFont);
PdfPTable table = new PdfPTable(1);
PdfPCell cell =
new PdfPCell(new Paragraph("\u0625\u0644\u0649 \u0645\u0646 \u064a\u0647\u0645\u0647 \u0627\u0644\u0623\u0645\u0631"+welcomeText,
font));
table.setRunDirection(PdfWriter.RUN_DIRECTION_RTL);
table.getDefaultCell().setBorder(Rectangle.NO_BORDER);
cell.setBorder(Rectangle.NO_BORDER);
table.addCell(cell);
doc.add(table);
The above code is not applying the different font sizes and styles

Add the chunks or phrases to the Paragraph.
Paragraph p = new Paragraph();
p.add(chunk1);
p.add(chunk2);
PdfPCell cell = new PdfPCell(p);
It's also possible (and desirable) to use PdfPCell in composite mode and add the objects directy there.

how to use i18n in pdf using itext in java

I am using the Hindi language for displaying header content of table in pdf but it displaying empty cell in header part of table.
I have created like as follows:
HttpServletResponse response = ServletActionContext.getResponse();
Document document = new Document();
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
PdfWriter writer = PdfWriter.getInstance(document, buffer);
writer.setBoxSize("art", new Rectangle(36, 54, 559, 788));
document.open();
PdfPTable lineItemTable = new PdfPTable(cellval);
lineItemTable.setHeaderRows(1);
PdfPCell num1 = new PdfPCell(new Phrase("No",Bold_NORMAL));
num1.setHorizontalAlignment(Element.ALIGN_CENTER);
num1.setBackgroundColor(BaseColor.LIGHT_GRAY);
lineItemTable.addCell(num1);
PdfPCell lineval = new PdfPCell(new Phrase(""));
lineval = new PdfPCell(new Phrase(HindiItenName,Bold_NORMAL));
lineval.setHorizontalAlignment(Element.ALIGN_CENTER);
lineval.setBackgroundColor(BaseColor.LIGHT_GRAY);
lineItemTable.addCell(lineval);
document.add(lineItemTable);
document.close();
response.setContentType("application/pdf;charset=ISO-8859-1");
response.setHeader("Content-Disposition","attachment;filename=Invoice-"+invNumber+".pdf");
response.getOutputStream().write(buffer.toByteArray());
This is my sample code. Can you please help to me. Thanks in advance.

Call
writer.close();
document.close();
response.setContentType("application/pdf");
Closing the writer rounds of some structures in the document. But I have seen many examples where this is not done. So I am not sure.
The content type is for binary and does not need an encoding.
On the error: pick a Unicode font, IDENTITY_H:
final String FONT = "c:/windows/... .ttf";
BaseFont bf = BaseFont.createFont(FONT, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
document.add(new Paragraph("Font: " + bf.getPostscriptFontName()
+ " with encoding: " + bf.getEncoding()));
Here an embedded font, so there will no problem at the recipient's side.
This is from itextpdf.com, a book excerpt.
For a better browser experience:
byte[] bytes = buffer.toByteArray();
response.setContentLength(bytes.length);
response.getOutputStream().write(bytes);

Align Paragraph at the center of the page

I am using itext to generate pdf file. I want to align my title in the middle of the page. Presently i am using like this
Paragraph preface = new Paragraph();
for (int i = 0; i < 10; i++) {
preface.add(new Paragraph(" "));
}
Is it correct or is there any another best way to do this.

Use Paragraph#setAlignment(int) :
Paragraph preface = new Paragraph();
preface.setAlignment(Element.ALIGN_CENTER);
See the ALIGN_* constants in the Element interface for more possible values.

Not sure if this is an old version, but for PdfWriter these methods weren't there. Instead I used:
Paragraph p = new Paragraph("This too shall pass");
p.Alignment = Element.ALIGN_CENTER;

public static final String DEST = "results/tables/centered_text.pdf";
public static void main(String[] args) throws IOException, DocumentException {
File file = new File(DEST);
file.getParentFile().mkdirs();
new CenteredTextInCell().createPdf(DEST);
}
public void createPdf(String dest) throws IOException, DocumentException {
Document document = new Document();
PdfWriter.getInstance(document, new FileOutputStream(dest));
document.open();
Font font = new Font(FontFamily.HELVETICA, 12, Font.BOLD);
Paragraph para = new Paragraph("Test", font);
para.setLeading(0, 1);
PdfPTable table = new PdfPTable(1);
table.setWidthPercentage(100);
PdfPCell cell = new PdfPCell();
cell.setMinimumHeight(50);
cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
cell.addElement(para);
table.addCell(cell);
document.add(table);
document.close();
}

If you are looking for a solution to Itext7 then you can use the method setTextAlignment(...).
Example:
Paragraph preface = new Paragraph();
// add text
preface.setTextAlignment(TextAlignment.CENTER);

If any one is looking for .NET/C# version, below is how I achieved the CENTER alignment.
I am using iText7 library for .NET/C#, and I achieved this using :
Paragraph preface = new Paragraph();
preface.SetTextAlignment(iText.Layout.Properties.TextAlignment.CENTER);

This is what worked for me (itext 5.0.5 ):
Paragraph p3= new Paragraph("Hello" );
p3.setAlignment(Element.ALIGN_CENTER);

I have searching solution for this to align PdfPCell text into right and also center. After modify and change the code sequence it is work.
This code is not work to align text to center.
PdfPCell cell = new PdfPCell();
cell.addElement(new Phrase("Testing Page");
cell.setHorizontalAlignment(Element.ALIGN_CENTER);
table.addCell(cell);
After modifying code with this , it is working now.
Paragraph p = new Paragraph("Testing Page");
//Pass Paragraph object into PdfPCell
PdfPCell cell = new PdfPCell(p);
cell.setHorizontalAlignment(Element.ALIGN_CENTER);
table.addCell(cell);