How to create a table with complex borders?

Please take a look at the NestedTableRoundedBorder example. It creates a PDF that looks like this: nested_table_rounded_border.pdf

Table with complex borders

This construction consists of nested tables. The outer table only has one column, but we use it to create the rounded corners:

class RoundRectangle implements PdfPCellEvent {
    public void cellLayout(PdfPCell cell, Rectangle rect,
            PdfContentByte[] canvas) {
        PdfContentByte cb = canvas[PdfPTable.LINECANVAS];
        cb.roundRectangle(
            rect.getLeft() + 1.5f, rect.getBottom() + 1.5f, rect.getWidth() - 3,
            rect.getHeight() - 3, 4);
        cb.stroke();
    }
}

This cell event is used like this:

cell = new PdfPCell(innertable);
cell.setCellEvent(roundRectangle);
cell.setBorder(Rectangle.NO_BORDER);
cell.setPadding(8);
outertable.addCell(cell);

The inner tables are used to create cells with or without borders, for instance like this:

// inner table 1
PdfPTable innertable = new PdfPTable(5);
innertable.setWidths(new int[]{8, 12, 1, 4, 12});
// first row
// column 1
cell = new PdfPCell(new Phrase("Record Ref:"));
cell.setBorder(Rectangle.NO_BORDER);
innertable.addCell(cell);
// column 2
cell = new PdfPCell(new Phrase("GN Staff"));
cell.setPaddingLeft(2);
innertable.addCell(cell);
// column 3
cell = new PdfPCell();
cell.setBorder(Rectangle.NO_BORDER);
innertable.addCell(cell);
// column 4
cell = new PdfPCell(new Phrase("Date: "));
cell.setBorder(Rectangle.NO_BORDER);
innertable.addCell(cell);
// column 5
cell = new PdfPCell(new Phrase("30/4/2015"));
cell.setPaddingLeft(2);
innertable.addCell(cell);
// spacing
cell = new PdfPCell();
cell.setColspan(5);
cell.setFixedHeight(3);
cell.setBorder(Rectangle.NO_BORDER);
innertable.addCell(cell);

If some of the dimensions are quite like you want, it's sufficient to change parameters such as the widths array, the padding, the fixed height, etc.