iText制作PDFCheckbox-2

PDF中checkBox的制作，需要依赖于PdfPCellEvent事件类，实例如下：

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 CheckboxCell2 {
	public static final String DEST = "E:\\checkbox_in_cell2.pdf";
	 
    public static void main(String[] args) throws IOException, DocumentException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new CheckboxCell2().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 6 columns
        PdfPTable table = new PdfPTable(6);
        table.setWidths(new int[]{50,50,50,50,50,50});
        PdfPCell cell;
        // We add 6 cells
        for (int i = 0; i < 6; i++) {
            cell = new PdfPCell();
            cell.setCellEvent(new CheckboxCellEvent("cb" + i, 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;
        protected int i;
        // We create a cell event
        public CheckboxCellEvent(String name, int i) {
            this.name = name;
            this.i = i;
        }
        // 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 = null;
            if(i%2==0){
            	//On,Yes,True都可以，表示选中，首选On
            	 /*checkbox = new RadioCheckField(
                         writer, rect, name, "True");*/
            	/* checkbox = new RadioCheckField(
                         writer, rect, name, "Yes");*/
            	 checkbox = new RadioCheckField(
                         writer, rect, name, "On");
            }
            else
            {
            	checkbox = new RadioCheckField(
                        writer, rect, name, "Off");
            }
            switch(i) {
                case 0:
                    checkbox.setCheckType(RadioCheckField.TYPE_CHECK);
                    break;
                case 1:
                    checkbox.setCheckType(RadioCheckField.TYPE_CIRCLE);
                    break;
                case 2:
                    checkbox.setCheckType(RadioCheckField.TYPE_CROSS);
                    break;
                case 3:
                    checkbox.setCheckType(RadioCheckField.TYPE_DIAMOND);
                    break;
                case 4:
                    checkbox.setCheckType(RadioCheckField.TYPE_SQUARE);
                    break;
                case 5:
                    checkbox.setCheckType(RadioCheckField.TYPE_STAR);
                    break;
            }
            checkbox.setChecked(true);
            // add the check box as a field
            try {
                writer.addAnnotation(checkbox.getCheckField());
                System.out.println("===========:end");
            } catch (Exception e) {
                throw new ExceptionConverter(e);
            }
        }
    }
}

结果如下：