itext

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来源：https://blog.csdn.net/sand_clock/category_6862979.html

ITEXT 页眉页脚页码三件套

转x33g5p2x  于2021-12-28 转载在 其他  
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问题场景

利用itext写PDF的过程中遇到生成页眉页脚页码的问题，记录下。

整体思路

  • 编写相应事件
  • 在适当位置添加事件

效果

CODE

需要导入的包：itext-pdfa-5.5.6.jar、itext-xtra-5.5.6.jar、itext-5.5.6.jar、itext-asian.jar

  1. import java.io.File;
  2. import java.io.FileOutputStream;
  3. import java.io.IOException;
  4. import java.net.MalformedURLException;
  6. import com.itextpdf.text.Document;
  7. import com.itextpdf.text.DocumentException;
  8. import com.itextpdf.text.ExceptionConverter;
  9. import com.itextpdf.text.Font;
  10. import com.itextpdf.text.Image;
  11. import com.itextpdf.text.PageSize;
  12. import com.itextpdf.text.Paragraph;
  13. import com.itextpdf.text.pdf.BaseFont;
  14. import com.itextpdf.text.pdf.PdfContentByte;
  15. import com.itextpdf.text.pdf.PdfPCell;
  16. import com.itextpdf.text.pdf.PdfPTable;
  17. import com.itextpdf.text.pdf.PdfPageEventHelper;
  18. import com.itextpdf.text.pdf.PdfTemplate;
  19. import com.itextpdf.text.pdf.PdfWriter;
  21. /** * @author youxingyang * @Date 2017-5-9 下午1:15:46 */
  22. public class pdfPage {
  24.     //页码事件
  25.     private static class PageXofYTest extends PdfPageEventHelper{
  26.         /** The PdfTemplate that contains the total number of pages. */
  27.         public PdfTemplate total;
  29.         public BaseFont bfChinese;
  31.         /** * 重写PdfPageEventHelper中的onOpenDocument方法 */
  32.         @Override
  33.         public void onOpenDocument(PdfWriter writer, Document document) {
  34.             // 得到文档的内容并为该内容新建一个模板
  35.             total = writer.getDirectContent().createTemplate(500, 500);
  36.             try {
  38.                 String prefixFont = "";
  39.                 String os = System.getProperties().getProperty("os.name");
  40.                 if(os.startsWith("win") || os.startsWith("Win")){
  41.                     prefixFont = "C:\\Windows\\Fonts" + File.separator;
  42.                 }else {
  43.                     prefixFont = "/usr/share/fonts/chinese" + File.separator;
  44.                 }
  46.                 // 设置字体对象为Windows系统默认的字体
  47.                 bfChinese = BaseFont.createFont(prefixFont + "simsun.ttc,0", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
  48.             } catch (Exception e) {
  49.                 throw new ExceptionConverter(e);
  50.             }
  51.         }
  53.         /** * 重写PdfPageEventHelper中的onEndPage方法 */
  54.         @Override
  55.         public void onEndPage(PdfWriter writer, Document document) {
  56.             // 新建获得用户页面文本和图片内容位置的对象
  57.             PdfContentByte pdfContentByte = writer.getDirectContent();
  58.             // 保存图形状态
  59.             pdfContentByte.saveState();
  60.             String text = writer.getPageNumber() + "/";
  61.             // 获取点字符串的宽度
  62.             float textSize = bfChinese.getWidthPoint(text, 9);
  63.             pdfContentByte.beginText();
  64.             // 设置随后的文本内容写作的字体和字号
  65.             pdfContentByte.setFontAndSize(bfChinese, 9);
  67.             // 定位'X/'
  68.             float x = (document.right() + document.left()) / 2;
  69.             float y = 56f;
  70.             pdfContentByte.setTextMatrix(x, y);
  71.             pdfContentByte.showText(text);
  72.             pdfContentByte.endText();
  74.             // 将模板加入到内容（content）中- // 定位'Y'
  75.             pdfContentByte.addTemplate(total, x + textSize, y);
  77.             pdfContentByte.restoreState();
  78.         }
  80.         /** * 重写PdfPageEventHelper中的onCloseDocument方法 */
  81.         @Override
  82.         public void onCloseDocument(PdfWriter writer, Document document) {
  83.             total.beginText();
  84.             try {
  85.                 String prefixFont = "";
  86.                 String os = System.getProperties().getProperty("os.name");
  87.                 if(os.startsWith("win") || os.startsWith("Win")){
  88.                     prefixFont = "C:\\Windows\\Fonts" + File.separator;
  89.                 }else {
  90.                     prefixFont = "/usr/share/fonts/chinese" + File.separator;
  91.                 }
  93.                 bfChinese = BaseFont.createFont(prefixFont + "simsun.ttc,0",BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
  94.                 total.setFontAndSize(bfChinese, 9);
  95.             } catch (DocumentException e) {
  96.                 e.printStackTrace();
  97.             } catch (IOException e) {
  98.                 e.printStackTrace();
  99.             }
  100.             total.setTextMatrix(0, 0);
  101.             // 设置总页数的值到模板上，并应用到每个界面
  102.             total.showText(String.valueOf(writer.getPageNumber() - 1));
  103.             total.endText();
  104.         }
  105.     }
  107.     //页眉事件
  108.     private static class Header extends PdfPageEventHelper {
  109.         public static PdfPTable header;
  111.         public Header(PdfPTable header) {
  112.             Header.header = header;
  113.         }
  115.         @Override
  116.         public void onEndPage(PdfWriter writer, Document document) {
  117.             //把页眉表格定位
  118.             header.writeSelectedRows(0, -1, 36, 806, writer.getDirectContent());
  119.         }
  121.         /** * 设置页眉 * @param writer * @param req * @throws MalformedURLException * @throws IOException * @throws DocumentException */
  122.         public void setTableHeader(PdfWriter writer) throws MalformedURLException, IOException, DocumentException {
  123.             String imageAddress = "E://TESTPDF/";
  124.             PdfPTable table = new PdfPTable(1);
  125.             table.setTotalWidth(555);
  126.             PdfPCell cell = new PdfPCell();
  127.             cell.setBorder(0);
  128.             Image image01;
  129.             image01 = Image.getInstance(imageAddress + "testhead.png"); //图片自己传
  130.             //image01.scaleAbsolute(355f, 10f);
  131.             image01.setWidthPercentage(80);
  132.             cell.setPaddingLeft(30f);
  133.             cell.setPaddingTop(-20f);
  134.             cell.addElement(image01);
  135.             table.addCell(cell);
  136.             Header event = new Header(table);
  137.             writer.setPageEvent(event);
  138.         }   
  139.     }
  141.     //页脚事件
  142.     private static class Footer extends PdfPageEventHelper {
  143.         public static PdfPTable footer;
  145.         @SuppressWarnings("static-access")
  146.         public Footer(PdfPTable footer) {
  147.             this.footer = footer;
  148.         }
  150.         @Override
  151.         public void onEndPage(PdfWriter writer, Document document) {
  152.             //把页脚表格定位
  153.             footer.writeSelectedRows(0, -1, 38, 50, writer.getDirectContent());
  154.         }
  156.         /** * 页脚是图片 * @param writer * @throws MalformedURLException * @throws IOException * @throws DocumentException */
  157.         public void setTableFooter(PdfWriter writer) throws MalformedURLException, IOException, DocumentException {
  158.             String imageAddress = "E://TESTPDF/";
  159.             PdfPTable table = new PdfPTable(1);
  160.             table.setTotalWidth(523);
  161.             PdfPCell cell = new PdfPCell();
  162.             cell.setBorder(1);
  163.             Image image01;
  164.             image01 = Image.getInstance(imageAddress + "testfooter.png"); //图片自己传
  165.             image01.scaleAbsoluteWidth(523);
  166.             image01.scaleAbsoluteHeight(30f);
  167.             image01.setWidthPercentage(100);
  168.             cell.addElement(image01);
  169.             table.addCell(cell);
  170.             Footer event = new Footer(table);
  171.             writer.setPageEvent(event);
  172.         }
  174.         /** * 页脚是文字 * @param writer * @param songti09 */
  175.         public void setTableFooter(PdfWriter writer, Font songti09) {
  176.             PdfPTable table = new PdfPTable(1);
  177.             table.setTotalWidth(520f);
  178.             PdfPCell cell = new PdfPCell();
  179.             cell.setBorder(1);
  180.             String string = "地址: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 网址: www.xxxxxxx.com 咨询热线: 400x-xxx-xxx";
  181.             Paragraph p = new Paragraph(string, songti09);
  182.             cell.setPaddingLeft(10f);
  183.             cell.setPaddingTop(-2f);
  184.             cell.addElement(p);
  185.             table.addCell(cell);
  186.             Footer event = new Footer(table);
  187.             writer.setPageEvent(event);
  188.         }
  189.     }
  191.     public static void main(String[] args) throws Exception {
  192.         Document document = new Document(PageSize.A4, 48, 48, 60, 65);
  193.         // add index page.
  194.         String path = "test.pdf";
  195.         String dir = "E://TEST";
  196.         File file = new File(dir);
  197.         if (!file.exists()) {
  198.             file.mkdir();
  199.         }
  200.         path = dir + File.separator + path;
  201.         FileOutputStream os = new FileOutputStream(path);
  202.         PdfWriter writer = PdfWriter.getInstance(document, os);
  204.         // 设置页面布局
  205.         writer.setViewerPreferences(PdfWriter.PageLayoutOneColumn);
  206.         // 为这篇文档设置页面事件(X/Y)
  207.         writer.setPageEvent(new PageXofYTest());
  209.         String prefixFont = "";
  210.         String oss = System.getProperties().getProperty("os.name");
  211.         if(oss.startsWith("win") || oss.startsWith("Win")){
  212.             prefixFont = "C:\\Windows\\Fonts" + File.separator;
  213.         }else {
  214.             prefixFont = "/usr/share/fonts/chinese" + File.separator;
  215.         }
  216.         BaseFont baseFont1 = BaseFont.createFont(prefixFont + "simsun.ttc,0", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
  217.         Font songti09 = new Font(baseFont1, 9f); //宋体 小五
  219.         document.open();
  221.         document.newPage();
  222.         PdfPTable pdfPTable = new PdfPTable(1);
  223.         // 为报告添加页眉，事件的发生是在生成报告之后，写入到硬盘之前
  224.         Header headerTable = new Header(pdfPTable);
  225.         headerTable.setTableHeader(writer);
  226.         Footer footerTable = new Footer(pdfPTable);
  227.         footerTable.setTableFooter(writer, songti09);
  228.         document.add(pdfPTable);
  230.         for (int i = 0; i < 36; i++) {
  231.             document.add(new Paragraph("the first page"));
  232.         }
  234.         document.newPage();
  235.         document.add(new Paragraph("the second page"));
  237.         document.close();
  238.         os.close();
  239.     }
  241. }

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原文链接 : https://blog.csdn.net/sand_clock/article/details/71455531

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