Document document = null;
PdfWriter writer = null;
try{
    // A4橫向
    document = new Document(new Rectangle(842.0F, 595.0F), 20F, 20F, 50F, 50F);
    writer = PdfWriter.getInstance(document, new FileOutputStream(...));
    document.open();
    
    // 解決不支持中文的問題
    BaseFont baseFont = BaseFont.createFont("STSong-Light","UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
    
    
 
// 字體
    // 標題：粗體、黑色、大小21
    Font titleFont = new Font(baseFont, 21F, Font.BOLD, BaseColor.BLACK);
    // 正文字體
    Font contentFont = new Font(baseFont, 16F);
    // 字體：下劃線
    Font titleFont = new Font(baseFont, 16F, Font.UNDERLINE);
    
    // 短句，document.add(..)不換行
    Phrase phrase;
    // 段落：document.add(..)換行
 

    Paragraph paragraph;

    // 標題
    paragraph = new Paragraph("YangNing", titleFont);
    paragraph.setLeading(30F);
    paragraph.setsetAlignment(Element.ALIGN_CENTER);
    document.add(paragraph);

    // 第一段
    phrase = new Phrase("文字A", contentFont);
    phrase .setLeading(30F);
    document.add(phrase);

    phrase 
 
= new Phrase("文字B\r\n", contentFont);
    phrase .setLeading(30F);
    document.add(phrase);

    // 第二段
    paragraph = new Paragraph("xxxx", contentFont);
    paragraph.setLeading(30F);
    document.add(paragraph);

    // 增加表格
    document.add(createTable(baseFont));
} catch (Exception e){
    // handle exception
} finally {
    if(document != null){
        document.close;
    }
    if(writer != null){
        writer.close;
    }
}

private PdfPTable createTable(BaseFont baseFont){
    Font tableFont = new Font(baseFont, 9F);
    // 兩列
    PdfPTable table = new PdfPTable(2)
    table.setWidthPercentage(100F);
    table.setSpacingBefore(10F);
    table.setSpacingAfter(10F);
    table.serWidths(new float[]{4F, 5F});

    PdfPCell child;

    child = new PdfPCell(new Phrase("姓名", tableFont));
    child.setMinimunHeight(30F)
    child.setHorizontalAlignment(Element.ALIGN_CERTER);
    child.setVerticalAlignment(Element.ALIGN_MIDDLE);
    table.addCell(child);

    child = new PdfPCell(new Phrase("年齡", tableFont));
    child.setMinimunHeight(30F)
    child.setHorizontalAlignment(Element.ALIGN_CERTER);
    child.setVerticalAlignment(Element.ALIGN_MIDDLE);
    table.addCell(child);

    child = new PdfPCell(new Phrase("yangxuyue", tableFont));
    child.setMinimunHeight(30F)
    child.setHorizontalAlignment(Element.ALIGN_CERTER);
    child.setVerticalAlignment(Element.ALIGN_MIDDLE);
    table.addCell(child);

    child = new PdfPCell(new Phrase("24", tableFont));
    child.setMinimunHeight(30F)
    child.setHorizontalAlignment(Element.ALIGN_CERTER);
    child.setVerticalAlignment(Element.ALIGN_MIDDLE);
    table.addCell(child);

    return table;
}

iText生成PDF