示例：使用iText 如何在 pdf 文档中添加表格

public static void main(String[] args)
{
	Document document = new Document();
	try
	{
		PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream('AddTableExample.pdf'));
		document.open();
		PdfPTable table = new PdfPTable(3); // 设置表格的列数
		table.setWidthPercentage(100); //设置宽度 100%
		table.setSpacingBefore(10f); // 表格前后的空隙
		table.setSpacingAfter(10f);  
		
		// 各列的宽度
		float[] columnWidths = {1f, 1f, 1f};
		table.setWidths(columnWidths);
		PdfPCell cell1 = new PdfPCell(new Paragraph('Cell 1'));
		cell1.setBorderColor(BaseColor.BLUE);
		cell1.setPaddingLeft(10);
		cell1.setHorizontalAlignment(Element.ALIGN_CENTER);
		cell1.setVerticalAlignment(Element.ALIGN_MIDDLE);
		PdfPCell cell2 = new PdfPCell(new Paragraph('Cell 2'));
		cell2.setBorderColor(BaseColor.GREEN);
		cell2.setPaddingLeft(10);
		cell2.setHorizontalAlignment(Element.ALIGN_CENTER);
		cell2.setVerticalAlignment(Element.ALIGN_MIDDLE);
		PdfPCell cell3 = new PdfPCell(new Paragraph('Cell 3'));
		cell3.setBorderColor(BaseColor.RED);
		cell3.setPaddingLeft(10);
		cell3.setHorizontalAlignment(Element.ALIGN_CENTER);
		cell3.setVerticalAlignment(Element.ALIGN_MIDDLE);
		
		// 设置下面值，可以避免单元格边框和内容重叠 
		//cell1.setUserBorderPadding(true);
		//cell2.setUserBorderPadding(true);
		//cell3.setUserBorderPadding(true);
		table.addCell(cell1);
		table.addCell(cell2);
		table.addCell(cell3);
		document.add(table);
		document.close();
		writer.close();
	} catch (Exception e)
	{
		e.printStackTrace();
	}
}