【java】itext pdf 分页

importjava.io.FileOutputStream;

importcom.lowagie.text.Document;

importcom.lowagie.text.Element;

importcom.lowagie.text.ExceptionConverter;

importcom.lowagie.text.Font;

importcom.lowagie.text.PageSize;

importcom.lowagie.text.Paragraph;

importcom.lowagie.text.pdf.BaseFont;

importcom.lowagie.text.pdf.PdfContentByte;

importcom.lowagie.text.pdf.PdfPageEventHelper;

importcom.lowagie.text.pdf.PdfTemplate;

importcom.lowagie.text.pdf.PdfWriter;

public classPdfExport extendsPdfPageEventHelper {

        publicPdfTemplate tpl;

        publicBaseFont bf;

        public static voidmain (String[] args) {

            Document document = newDocument (PageSize.A4, 20, 20, 20, 20);

            try{

                PdfWriter writer = PdfWriter.getInstance(document, newFileOutputStream (“D:\\HelloItext.pdf”) );

                writer.setPageEvent (newPdfExport() );

                BaseFont bfChinese = BaseFont.createFont(“STSong-Light”, “UniGB-UCS2-H”, BaseFont.NOT_EMBEDDED);

                document.open();

                Paragraph title = newParagraph (“测试内容。。。。”, newFont (bfChinese,15) );

                title.setAlignment (Element.ALIGN_CENTER);

                document.add (title);

            } catch(Exception de) {

                de.printStackTrace();

            }

            document.close();

        }

        public voidonOpenDocument (PdfWriter writer, Documentdocument) {

            try{

                tpl= writer.getDirectContent().createTemplate(100, 100);

                bf= BaseFont.createFont(“STSong-Light”, “UniGB-UCS2-H”, BaseFont.NOT_EMBEDDED);

            } catch(Exception e) {

                throw newExceptionConverter (e);

            }

        }

        public voidonEndPage (PdfWriter writer, Documentdocument) {

            //在每页结束的时候把“第x页”信息写道模版指定位置

            PdfContentByte cb =writer.getDirectContent();

            cb.saveState();

            String text = “第”+writer.getPageNumber() + “页,共”;

            cb.beginText();

            cb.setFontAndSize (bf, 8);

            cb.setTextMatrix (460, 786); //定位“第x页,共” 在具体的页面调试时候需要更改这xy的坐标

            cb.showText (text);

            cb.endText();

            cb.addTemplate (tpl, 492, 786); //定位“y页” 在具体的页面调试时候需要更改这xy的坐标

            cb.saveState();

            cb.stroke();

            cb.restoreState();

            cb.closePath();//sanityCheck();

        }

        public voidonCloseDocument (PdfWriter writer, Documentdocument) {

            //关闭document的时候获取总页数，并把总页数按模版写道之前预留的位置

            tpl.beginText();

            tpl.setFontAndSize (bf, 8);

            tpl.showText (Integer.toString(writer.getPageNumber() – 1) + “页”);

            tpl.endText();

            tpl.closePath();//sanityCheck();

        }

}