iText制作PDFCheckbox-1

package test;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.ExceptionConverter;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPCellEvent;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.text.pdf.RadioCheckField;
	public class CheckboxCell {
		 
	    public static final String DEST = "E:\\checkboxl.pdf";
	 
	    public static void main(String[] args) throws IOException, DocumentException {
	        File file = new File(DEST);
	        file.getParentFile().mkdirs();
	        new CheckboxCell().createPdf(DEST);
	    }
	 
	    public void createPdf(String dest) throws IOException, DocumentException {
	        Document document = new Document();
	        PdfWriter.getInstance(document, new FileOutputStream(dest));
	        document.open();
	        // We create a table with 5 columns
	        PdfPTable table = new PdfPTable(5);
	        PdfPCell cell;
	        // We add 5 cells
	        for (int i = 0; i < 5; i++) {
	            cell = new PdfPCell();
	            cell.setCellEvent(new CheckboxCellEvent("cb" + i));
	            // We create cell with height 50
	            cell.setMinimumHeight(50);
	            table.addCell(cell);
	        }
	        document.add(table);
	        document.close();
	    }
	 
	    class CheckboxCellEvent implements PdfPCellEvent {
	        // The name of the check box field
	        protected String name;
	        // We create a cell event
	        public CheckboxCellEvent(String name) {
	            this.name = name;
	        }
	        // We create and add the check box field
	        public void cellLayout(PdfPCell cell, Rectangle position,
	            PdfContentByte[] canvases) {
	            PdfWriter writer = canvases[0].getPdfWriter(); 
	            // define the coordinates of the middle
	            float x = (position.getLeft() + position.getRight()) / 2;
	            float y = (position.getTop() + position.getBottom()) / 2;
	            // define the position of a check box that measures 20 by 20
	            Rectangle rect = new Rectangle(x - 10, y - 10, x + 10, y + 10);
	            // define the check box
	            RadioCheckField checkbox = new RadioCheckField(
	                    writer, rect, name, "ON");
	            checkbox.setCheckType(RadioCheckField.TYPE_CHECK);
	            //关键
	            checkbox.setChecked(true);
	            //checkbox.setChecked(false);
	            // add the check box as a field
	            try {
	                writer.addAnnotation(checkbox.getCheckField());
	                System.out.println("===========:end");
	            } catch (Exception e) {
	                throw new ExceptionConverter(e);
	            }
	        }
	    }
	}