JavaWeb项目生成PDF文件添加水印图片并导出

一、前言

首先需要在Maven中添加相应的jar包依赖，若项目没用到Maven，也可自行下载相应所需的jar包（itextpdf.jar 与 itext-asian.jar），如下图所示。点此下载

Maven中添加依赖jar包如下所示：

 <!-- pdf start -->
 <dependency>
     <groupId>com.itextpdf</groupId>
     <artifactId>itextpdf</artifactId>
     <version>5.3.2</version>
 </dependency>
 <dependency>
     <groupId>com.itextpdf</groupId>
     <artifactId>itext-asian</artifactId>
     <version>5.2.0</version>
 </dependency>
 <!-- pdf end -->

二、正文

1、首先获取需要填写至PDF中的数据，如下述所示，realPath为添加图片的路径，test.pdf为未添加图片的PDF临时文件，在Tomcat服务器对应路径下，以及导出的PDF文件存至桌面：

 //点击下载获取企业信息并存至Pdf
 @RequestMapping(value="/downloadPdf.do")
 @ResponseBody
 public String downloadPdf(@RequestParam(value = "download_corp_id") String download_corp_id, HttpServletRequest request) throws Exception {
     List<TCorp> corpIfs = searchCorpService.getCorpInfo(Integer.parseInt(download_corp_id));
     TCorp tCorp = new TCorp();
     for (TCorp corpInfo: corpIfs){
         tCorp.setId(corpInfo.getId());
         tCorp.setRegNo(corpInfo.getRegNo());
         tCorp.setCorpName(corpInfo.getCorpName());
         tCorp.setCorpAddr(corpInfo.getCorpAddr());
         tCorp.setBelongOrg(corpInfo.getBelongOrg());
         tCorp.setBelongDistOrg(corpInfo.getBelongDistOrg());
         tCorp.setBelongTrade(corpInfo.getBelongTrade());
         tCorp.setEconKind(corpInfo.getEconKind());
         tCorp.setAdmitMain(corpInfo.getAdmitMain());
         tCorp.setStartDate(corpInfo.getStartDate());
         tCorp.setCheckDate(corpInfo.getCheckDate());
         tCorp.setOperManIdentNo(corpInfo.getOperManIdentNo());
         tCorp.setOperManName(corpInfo.getOperManName());
         tCorp.setCorpStatus(corpInfo.getCorpStatus());
         tCorp.setRegCapi(corpInfo.getRegCapi());
         tCorp.setPaidCapi(corpInfo.getPaidCapi());
         tCorp.setFareTermStart(corpInfo.getFareTermStart());
         tCorp.setFareTermEnd(corpInfo.getFareTermEnd());
         tCorp.setFareScope(corpInfo.getFareScope());
         tCorp.setUniScid(corpInfo.getUniScid());
         tCorp.setCorpTel(corpInfo.getCorpTel());
         tCorp.setCorpWebUrl(corpInfo.getCorpWebUrl());
         tCorp.setCorpLogo(corpInfo.getCorpLogo());
         tCorp.setCorpEmail(corpInfo.getCorpEmail());
         tCorp.setPracPersonNum(corpInfo.getPracPersonNum());
         tCorp.setOrgInstCode(corpInfo.getOrgInstCode());
         tCorp.setTaxpayNum(corpInfo.getTaxpayNum());
         tCorp.setStaffSize(corpInfo.getStaffSize());
         tCorp.setEnglishName(corpInfo.getEnglishName());
         tCorp.setFormerName(corpInfo.getFormerName());
         tCorp.setCorpInfo(corpInfo.getCorpInfo());
         tCorp.setCreateDate(corpInfo.getCreateDate());
         tCorp.setCreateOrg(corpInfo.getCreateOrg());
     }

     String realPath = request.getSession().getServletContext().getRealPath("/") + "\\icon\\logo_64.png";
     PDFReport.settCorp(tCorp);
     new PDFReport("test.pdf").generatePDF();
     PDFUtil.addImage("test.pdf", "C:\\Users\\Administrator\\Desktop\\"+tCorp.getCorpName()+".pdf",realPath);

     return "提示：数据导出成功!";
 }

2、PDFReport类中申明一个文档类型建立Document对象，设置页面样式等：

 package util;

 import com.itextpdf.text.Document;
 import com.itextpdf.text.PageSize;
 import com.itextpdf.text.Rectangle;
 import com.itextpdf.text.pdf.PdfPTable;
 import com.itextpdf.text.pdf.PdfWriter;
 import entity.TCorp;

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

 public class PDFReport {
     private static TCorp tCorp;

     Document document = new Document();// 建立一个Document对象

     public PDFReport(String out) {
         try {
             File file = new File(out);
             file.createNewFile();
             Rectangle pageSize = new Rectangle(PageSize.A4);
             document.setPageSize(pageSize);
             PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(file));
             PDFBuilder builder = new PDFBuilder();
             writer.setPageEvent(builder);
             document.open();
             PdfPTable table = generatePDF();
             document.add(table);
             document.close();
         } catch (Exception e) {
             e.printStackTrace();
         }
     }

     public static void settCorp(TCorp tCorp) {
         PDFReport.tCorp = tCorp;
     }

     public PdfPTable generatePDF() {
         //设置单元格为5列
         PdfPTable table = PDFUtil.createTable(5);

         table.addCell(PDFUtil.createHeadCell("企业信息列表"));
         table.addCell(PDFUtil.createTitleCell_1("企业名称"));
         table.addCell(PDFUtil.createCell_1(tCorp.getCorpName()));
         table.addCell(PDFUtil.createTitleCell_1("联系方式"));
         table.addCell(PDFUtil.createCell_1(tCorp.getCorpTel()));
         table.addCell(PDFUtil.createCell_2("Logo"));

         table.addCell(PDFUtil.createTitleCell_1("企业邮箱"));
         table.addCell(PDFUtil.createCell_1(tCorp.getCorpEmail()));
         table.addCell(PDFUtil.createTitleCell_1("网址"));
         table.addCell(PDFUtil.createCell_1(tCorp.getCorpWebUrl()));

         table.addCell(PDFUtil.createTitleCell_1("企业地址"));
         table.addCell(PDFUtil.createCell_1(tCorp.getCorpAddr()));
         table.addCell(PDFUtil.createTitleCell_1("注册/实缴"));
         table.addCell(PDFUtil.createCell_1(String.valueOf(tCorp.getRegCapi())+"万 / "+String.valueOf(tCorp.getPaidCapi())+"万"));

         table.addCell(PDFUtil.createTitleCell_1("成立日期"));
         table.addCell(PDFUtil.createCell_1(tCorp.getStartDate()));
         table.addCell(PDFUtil.createTitleCell_1("统一社会信用代码"));
         table.addCell(PDFUtil.createCell_3(tCorp.getUniScid()));

         table.addCell(PDFUtil.createTitleCell_1("法定代表人"));
         table.addCell(PDFUtil.createCell_1(tCorp.getOperManName()));
         table.addCell(PDFUtil.createTitleCell_1("纳税人识别号"));
         table.addCell(PDFUtil.createCell_3(tCorp.getTaxpayNum()));

         table.addCell(PDFUtil.createTitleCell_1("注册号"));
         table.addCell(PDFUtil.createCell_1(tCorp.getRegNo()));
         table.addCell(PDFUtil.createTitleCell_1("组织机构代码"));
         table.addCell(PDFUtil.createCell_3(tCorp.getOrgInstCode()));

         table.addCell(PDFUtil.createTitleCell_1("公司类型"));
         table.addCell(PDFUtil.createCell_1(tCorp.getEconKind()));
         table.addCell(PDFUtil.createTitleCell_1("人员规模"));
         table.addCell(PDFUtil.createCell_3(tCorp.getStaffSize()));

         table.addCell(PDFUtil.createTitleCell_1("营业期限"));
         table.addCell(PDFUtil.createCell_1(tCorp.getFareTermStart()+" 至 "+tCorp.getFareTermEnd()));
         table.addCell(PDFUtil.createTitleCell_1("登记机关"));
         table.addCell(PDFUtil.createCell_3(tCorp.getBelongOrg()));

         table.addCell(PDFUtil.createTitleCell_1("核准日期"));
         table.addCell(PDFUtil.createCell_1(tCorp.getCheckDate()));
         table.addCell(PDFUtil.createTitleCell_1("所属行业"));
         table.addCell(PDFUtil.createCell_3(tCorp.getBelongTrade()));

         table.addCell(PDFUtil.createTitleCell_1("英文名称"));
         table.addCell(PDFUtil.createCell_1(tCorp.getEnglishName()));
         table.addCell(PDFUtil.createTitleCell_1("曾用名"));
         table.addCell(PDFUtil.createCell_3(tCorp.getFormerName()));

         table.addCell(PDFUtil.createTitleCell_2("经营范围"));
         table.addCell(PDFUtil.createCell_4(tCorp.getFareScope()));

         return table;
     }
 }

3、PDFUtil类中设置字体、表格样式、以及水印文字样式，setColspan函数为设置所跨列数，setRowspan函数为设置所跨行数：

 package util;

 import com.itextpdf.text.*;
 import com.itextpdf.text.pdf.*;

 import javax.imageio.ImageIO;
 import java.io.BufferedOutputStream;
 import java.io.File;
 import java.io.FileOutputStream;

 public class PDFUtil {
     private static Font headfont ; // 设置字体大小
     private static Font keyfont;   // 设置字体大小
     private static Font textfont;  // 设置字体大小

     static{
         BaseFont bfChinese;
         try {
             bfChinese = BaseFont.createFont("STSong-Light","UniGB-UCS2-H",BaseFont.NOT_EMBEDDED);
             headfont = new Font(bfChinese, 24, Font.BOLD,BaseColor.BLACK);// 设置字体大小
             keyfont = new Font(bfChinese, 12, Font.BOLD,BaseColor.BLACK);// 设置字体大小
             textfont = new Font(bfChinese, 10, Font.NORMAL,BaseColor.BLACK);// 设置字体大小
         } catch (Exception e) {
             e.printStackTrace();
         }
     }

     //表格标题
     public static PdfPCell createHeadCell(String value){
         PdfPCell cell = new PdfPCell();
         cell.setVerticalAlignment(15);
         cell.setHorizontalAlignment(15);
         cell.setColspan(5);
         cell.setPhrase(new Phrase(value,headfont));
         cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中
         cell.setPadding(10.0f);
         cell.setBorder(0);
         cell.setPaddingTop(5.0f);
         cell.setPaddingBottom(18.0f);
         return cell;
     }

     //表格表头样式1
     public static  PdfPCell createTitleCell_1(String value){
         PdfPCell cell = new PdfPCell();
         cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
         cell.setHorizontalAlignment(Element.ALIGN_CENTER);
         cell.setPhrase(new Phrase(value, keyfont));
         cell.setBackgroundColor(new BaseColor(29, 181, 238));
         cell.setColspan(1);
         cell.setFixedHeight(35);
         return cell;
     }

     //表格表头样式2
     public static  PdfPCell createTitleCell_2(String value){
         PdfPCell cell = new PdfPCell();
         cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
         cell.setHorizontalAlignment(Element.ALIGN_CENTER);
         cell.setPhrase(new Phrase(value, keyfont));
         cell.setBackgroundColor(new BaseColor(29, 181, 238));
         cell.setColspan(1);
         cell.setRowspan(3);
         cell.setFixedHeight(105);
         return cell;
     }

     //表格内容样式1
     public static PdfPCell createCell_1(String value){
         PdfPCell cell = new PdfPCell();
         cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
         cell.setHorizontalAlignment(Element.ALIGN_CENTER);
         cell.setPhrase(new Phrase(value,textfont));
         cell.setBackgroundColor(new BaseColor(255, 255, 255));
         cell.setColspan(1);
         cell.setFixedHeight(35);
         return cell;
     }

     //表格内容样式2
     public static PdfPCell createCell_2(String value){
         PdfPCell cell = new PdfPCell();
         cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
         cell.setHorizontalAlignment(Element.ALIGN_CENTER);
         cell.setPhrase(new Phrase(value,textfont));
         cell.setBackgroundColor(new BaseColor(255, 255, 255));
         cell.setColspan(1);
         cell.setRowspan(3);
         cell.setFixedHeight(105);
         return cell;
     }

     //表格内容样式3
     public static PdfPCell createCell_3(String value){
         PdfPCell cell = new PdfPCell();
         cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
         cell.setHorizontalAlignment(Element.ALIGN_CENTER);
         cell.setPhrase(new Phrase(value,textfont));
         cell.setBackgroundColor(new BaseColor(255, 255, 255));
         cell.setColspan(2);
         cell.setFixedHeight(35);
         return cell;
     }

     //表格内容样式4
     public static PdfPCell createCell_4(String value){
         PdfPCell cell = new PdfPCell();
         cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
         cell.setHorizontalAlignment(Element.ALIGN_CENTER);
         cell.setPhrase(new Phrase(value,textfont));
         cell.setBackgroundColor(new BaseColor(255, 255, 255));
         cell.setColspan(4);
         cell.setRowspan(3);
         cell.setFixedHeight(105);
         return cell;
     }

     //生成表格
     public static PdfPTable createTable(int colNumber){
         int widths[] = { 35,40,35,35,30 };
         PdfPTable baseTable  = new PdfPTable(colNumber);
         baseTable.setWidthPercentage(100);
         baseTable.setSpacingBefore(10);
         try {
             baseTable.setWidths(widths);
         } catch (DocumentException e) {
             e.printStackTrace();
         }
         return baseTable;
     }

     public static  void addImage(String input,String output,String realPath) throws Exception{
         BufferedOutputStream out = new BufferedOutputStream(
                 new FileOutputStream(new File(output)));
         PdfReader reader = new PdfReader(input);
         PdfStamper stamper = new PdfStamper(reader, out);
         addWatermark(stamper,"测试添加水印文字");
         int total = reader.getNumberOfPages();
         try {
             Image image = Image.getInstance(realPath);
             image.setAbsolutePosition(350, 200);
             image.scaleToFit(160, 70);
             PdfContentByte content= stamper.getOverContent(total);// 在内容上方加水印
             content.addImage(image);
         }catch (Exception e){
             e.printStackTrace();
         }

         stamper.close();
         reader.close();
     }

     public static void addWatermark(PdfStamper pdfStamper, String waterMarkName) throws Exception {
         PdfContentByte content;
         BaseFont base = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H",
                 BaseFont.NOT_EMBEDDED);
         Rectangle pageRect;
         PdfGState gs = new PdfGState();
         try {
             if (base == null || pdfStamper == null) {
                 return;
             }
             // 设置透明度为0.4
             gs.setFillOpacity(0.3f);
             gs.setStrokeOpacity(0.3f);
             int toPage = pdfStamper.getReader().getNumberOfPages();
             for (int i = 1; i <= toPage; i++) {
                 pageRect = pdfStamper.getReader().getPageSizeWithRotation(i);
                 // 计算水印X,Y坐标
                 float x = pageRect.getWidth() / 2;
                 float y = pageRect.getHeight() / 2;
                 // 获得PDF最顶层
                 content = pdfStamper.getOverContent(i);
                 content.saveState();
                 // set Transparency
                 content.setGState(gs);
                 content.beginText();
                 content.setColorFill(BaseColor.GRAY);
                 content.setFontAndSize(base, 30);
                 // 水印文字成45度角倾斜
                 content.showTextAligned(Element.ALIGN_CENTER, waterMarkName, x,
                         y, 45);
                 content.endText();
             }
         } catch (Exception ex) {
             ex.printStackTrace();
         }
     }
 }

4、PDFBuilder类中为设置页面附加属性：

 package util;

 import com.itextpdf.text.*;
 import com.itextpdf.text.pdf.*;

 import java.io.IOException;

 public class PDFBuilder extends PdfPageEventHelper {
     /**
      * 页眉
      */
     public String header = "";

     /**
      * 文档字体大小，页脚页眉最好和文本大小一致
      */
     public int presentFontSize = 12;

     // 模板
     public PdfTemplate total;

     // 基础字体对象
     public BaseFont bf = null;

     // 利用基础字体生成的字体对象，一般用于生成中文文字
     public Font fontDetail = null;

     /**
      *
      * Creates a new instance of PdfReportM1HeaderFooter 无参构造方法.
      *
      */
     public PDFBuilder() {

     }

     public void setHeader(String header) {
         this.header = header;
     }

     /**
      *
      * TODO 文档打开时创建模板
      *
      * @see com.itextpdf.text.pdf.PdfPageEventHelper#onOpenDocument(com.itextpdf.text.pdf.PdfWriter,
      *      com.itextpdf.text.Document)
      */
     public void onOpenDocument(PdfWriter writer, Document document) {
         total = writer.getDirectContent().createTemplate(50, 50);// 共 页 的矩形的长宽高
     }

     /**
      *
      * TODO 关闭每页的时候，写入页眉，写入'第几页共'这几个字。
      *
      * @see com.itextpdf.text.pdf.PdfPageEventHelper#onEndPage(com.itextpdf.text.pdf.PdfWriter,
      *      com.itextpdf.text.Document)
      */
     public void onEndPage(PdfWriter writer, Document document) {
         this.addPage(writer, document);
     }

     //加分页
     public void addPage(PdfWriter writer, Document document){
         try {
             if (bf == null) {
                 bf = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", false);
             }
             if (fontDetail == null) {
                 fontDetail = new Font(bf, presentFontSize, Font.NORMAL);// 数据体字体
             }
         } catch (DocumentException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }

         // 1.写入页眉
         ColumnText.showTextAligned(writer.getDirectContent(),
                 Element.ALIGN_LEFT, new Phrase(header, fontDetail),
                 document.left(), document.top() + 20, 0);
         // 2.写入前半部分的 第 X页/共
         int pageS = writer.getPageNumber();
         String foot1 = "第 " + pageS + " 页 / 共";
         Phrase footer = new Phrase(foot1, fontDetail);

         // 3.计算前半部分的foot1的长度，后面好定位最后一部分的'Y页'这俩字的x轴坐标，字体长度也要计算进去 = len
         float len = bf.getWidthPoint(foot1, presentFontSize);

         // 4.拿到当前的PdfContentByte
         PdfContentByte cb = writer.getDirectContent();

         // 5.写入页脚1，x轴就是(右margin+左margin + right() -left()- len)/2.0F
         // 再给偏移20F适合人类视觉感受，否则肉眼看上去就太偏左了
         // ,y轴就是底边界-20,否则就贴边重叠到数据体里了就不是页脚了；注意Y轴是从下往上累加的，最上方的Top值是大于Bottom好几百开外的。
         ColumnText
                 .showTextAligned(
                         cb,
                         Element.ALIGN_CENTER,
                         footer,
                         (document.rightMargin() + document.right()
                                 + document.leftMargin() - document.left() - len) / 2.0F + 20F,
                         document.bottom() - 20, 0);

         // 6.写入页脚2的模板（就是页脚的Y页这俩字）添加到文档中，计算模板的和Y轴,X=(右边界-左边界 - 前半部分的len值)/2.0F +
         // len ， y 轴和之前的保持一致，底边界-20
         cb.addTemplate(total, (document.rightMargin() + document.right()
                         + document.leftMargin() - document.left()) / 2.0F + 20F,
                 document.bottom() - 20); // 调节模版显示的位置

     }

     /**
      *
      * TODO 关闭文档时，替换模板，完成整个页眉页脚组件
      *
      * @see com.itextpdf.text.pdf.PdfPageEventHelper#onCloseDocument(com.itextpdf.text.pdf.PdfWriter,
      *      com.itextpdf.text.Document)
      */
     public void onCloseDocument(PdfWriter writer, Document document) {
         // 7.最后一步，是关闭文档的时候，将模板替换成实际的 Y 值,至此，page x of y 制作完毕，完美兼容各种文档size。
         total.beginText();
         total.setFontAndSize(bf, presentFontSize);// 生成的模版的字体、颜色
         String foot2 = " " + (writer.getPageNumber()-1) + " 页";
         total.showText(foot2);// 模版显示的内容
         total.endText();
         total.closePath();
     }
 }

最后附上生成的PDF效果图：

本文学习参考了：https://blog.csdn.net/qq_30490591/article/details/53434777

至此是关于JavaWeb项目生成PDF文件添加水印图片并导出，仅供参考。

如有疏漏错误之处，还请不吝赐教！