Java实现给PDF文件加水印、图片、签名（含测试类）

2024-07-12 20:40| 来源: 网络整理| 查看: 265

前言

你好呀，我是小邹。

昨天给大家分享了PDF文件添加水印后保存，今天再来聊一聊如何实现印章、签名。

“Talk is cheap，show me the code.”

效果

在这里插入图片描述

实现

① 添加相关依赖

com.itextpdf itextpdf 5.5.13 com.itextpdf itext-asian 5.2.0

② 工具类PdfUtil

package top.hqxiaozou.utils; import top.hqxiaozou.entity.PdfAddContentParam; import com.itextpdf.awt.geom.Rectangle2D; import com.itextpdf.text.*; import com.itextpdf.text.Font; import com.itextpdf.text.Image; import com.itextpdf.text.Rectangle; import com.itextpdf.text.pdf.*; import com.itextpdf.text.pdf.parser.ImageRenderInfo; import com.itextpdf.text.pdf.parser.PdfReaderContentParser; import com.itextpdf.text.pdf.parser.RenderListener; import com.itextpdf.text.pdf.parser.TextRenderInfo; import lombok.SneakyThrows; import lombok.extern.slf4j.Slf4j; import javax.imageio.ImageIO; import javax.swing.*; import java.awt.*; import java.awt.image.BufferedImage; import java.io.*; import java.nio.file.Files; import java.nio.file.Paths; import java.util.List; /** * @author：邹祥发 * @date：2022/11/24 10:19 * @description：PDF工具类，提供水印、签名、盖章功能 */ @Slf4j public class PdfUtil { /** * 往PDF上添加文字水印 * * @param inputFile 原文件 * @param outputFile 加水印后的文件 * @param waterMarkName 水印字符 */ public static void addWaterMark(String inputFile, String outputFile, String waterMarkName) { PdfReader reader = null; PdfStamper stamper = null; try { reader = new PdfReader(inputFile); stamper = new PdfStamper(reader, Files.newOutputStream(Paths.get(outputFile))); //水印字体，放到服务器上对应文件夹下（arial中文不生效） //BaseFont base = BaseFont.createFont("D:/workspace/springboot/src/main/resources/arial.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED); BaseFont base = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.EMBEDDED); Rectangle pageRect; PdfGState gs = new PdfGState(); //填充不透明度为1完全不透明 gs.setFillOpacity(0.1f); //笔画不透明度，为1完全不透明 gs.setStrokeOpacity(0.1f); int total = reader.getNumberOfPages() + 1; JLabel label = new JLabel(); FontMetrics metrics; int textH; int textW; label.setText(waterMarkName); metrics = label.getFontMetrics(label.getFont()); textH = metrics.getHeight(); textW = metrics.stringWidth(label.getText()); PdfContentByte under; int interval = 0; for (int i = 1; i //这里设置字体左右间隔 for (int width = interval + textW; width e.printStackTrace(); } finally { try { if (stamper != null) { stamper.close(); } } catch (IOException | com.itextpdf.text.DocumentException e) { e.printStackTrace(); } if (reader != null) { reader.close(); } } } /** * 根据指定坐标往PDF上添加文字内容 * * @param filePath 原文件路径 * @param pdfAddContentParams 实体类 */ public static byte[] addText(String filePath, List pdfAddContentParams) throws Exception { PdfReader pdfReader = new PdfReader(filePath); ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); //设置输入文件以及输出文件地址 PdfStamper stamper = new PdfStamper(pdfReader, byteArrayOutputStream); //设置字体 BaseFont baseFont = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED); for (PdfAddContentParam pdfAddContentParam : pdfAddContentParams) { Font font = new Font(baseFont, 10); if (pdfAddContentParam.getPageNum() > pdfReader.getNumberOfPages()) { log.error("设置的页码数[" + pdfAddContentParam.getPageNum() + "]大于原文件页码数[" + pdfReader.getNumberOfPages() + "]！请重新输入"); throw new RuntimeException("设置的页码数[" + pdfAddContentParam.getPageNum() + "]大于原文件页码数[" + pdfReader.getNumberOfPages() + "]！请重新输入"); } PdfContentByte overContent = stamper.getOverContent(pdfAddContentParam.getPageNum()); ColumnText columnText = new ColumnText(overContent); columnText.setSimpleColumn(pdfAddContentParam.getLlx(), pdfAddContentParam.getLly(), pdfAddContentParam.getUrx(), pdfAddContentParam.getUry()); Paragraph elements = new Paragraph(pdfAddContentParam.getContent()); elements.setFont(font); columnText.addElement(elements); columnText.go(); } stamper.close(); return byteArrayOutputStream.toByteArray(); } /** * 根据关键字往PDF上添加文字内容 * * @param filePath 原文件路径 * @param pdfAddContentParams 实体类 */ public static byte[] addTextByKeyword(String filePath, List pdfAddContentParams) throws Exception { PdfReader pdfReader = new PdfReader(filePath); ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); //设置输入文件以及输出文件地址 PdfStamper stamper = new PdfStamper(pdfReader, byteArrayOutputStream); // 获取PDF文件的总页数 int pageNum = pdfReader.getNumberOfPages(); PdfReaderContentParser pdfReaderContentParser = new PdfReaderContentParser(pdfReader); for (PdfAddContentParam pdfAddContentParam : pdfAddContentParams) { StringBuilder stringBuilder = new StringBuilder(); final boolean[] hasKeyword = {false, true}; String keyword = pdfAddContentParam.getKeyword(); int length = keyword.length(); if (length == 0) { throw new RuntimeException("请输入关键字！"); } for (int page = 1; page break; } int finalPage = page; pdfReaderContentParser.processContent(page, new RenderListener() { @Override public void beginTextBlock() { } @SneakyThrows @Override public void renderText(TextRenderInfo renderInfo) { // 读取PDF文件的内容 String text = renderInfo.getText().trim(); stringBuilder.append(text); if (stringBuilder.toString().contains(keyword)) { Rectangle2D.Float boundingRectangle = renderInfo.getBaseline().getBoundingRectange(); if (hasKeyword[1]) { // 关键字的坐标 double x = boundingRectangle.getX(); double y = boundingRectangle.getY(); //设置字体 BaseFont baseFont = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED); Font font = new Font(baseFont, 10); PdfContentByte overContent = stamper.getOverContent(finalPage); ColumnText columnText = new ColumnText(overContent); // 根据关键字的坐标计算+偏移量得到批注字体的坐标 columnText.setSimpleColumn((float) x + pdfAddContentParam.getLlx(), (float) y + pdfAddContentParam.getLly(), (float) x + 100 + pdfAddContentParam.getUrx(), (float) y + pdfAddContentParam.getUry()); Paragraph elements = new Paragraph(pdfAddContentParam.getContent()); elements.setFont(font); columnText.addElement(elements); columnText.go(); hasKeyword[1] = false; } hasKeyword[0] = true; } if (stringBuilder.toString().length() > length * 3) { stringBuilder.setLength(0); } } @Override public void endTextBlock() { } @Override public void renderImage(ImageRenderInfo renderInfo) { } }); } } stamper.close(); pdfReader.close(); return byteArrayOutputStream.toByteArray(); } /** * pdf插入图片 * * @param oldPath 插入图片前的路径 * @param newPath 插入图片后的路径 * @param imgPath 图片路径 * @throws IOException * @throws DocumentException */ public static void addImage(String oldPath, String newPath, String imgPath) throws IOException, DocumentException { InputStream inputStream = Files.newInputStream(Paths.get(oldPath)); FileOutputStream out = new FileOutputStream(newPath); PdfReader reader = new PdfReader(inputStream); //pdf页数 int pdfPages = reader.getNumberOfPages(); PdfStamper stamper = new PdfStamper(reader, out); //图片 BufferedImage bufferedImage = ImageIO.read(Files.newInputStream(Paths.get(imgPath))); //x轴坐标 int x = 350; //y轴坐标 int y = 20; //图片放置的页码 for (int i = pdfPages; i /** * 转换BufferedImage 数据为byte数组 * * @param image Image对象 * @param format image格式字符串.如"gif","png" * @return byte数组 */ public static byte[] imageToBytes(BufferedImage image, String format) { ByteArrayOutputStream out = new ByteArrayOutputStream(); try { ImageIO.write(image, format, out); } catch (IOException e) { e.printStackTrace(); } return out.toByteArray(); } /** * 转换byte数组为Image * * @param bytes * @return Image */ public static Image bytesToImage(byte[] bytes) { Image image = Toolkit.getDefaultToolkit().createImage(bytes); try { MediaTracker mt = new MediaTracker(new Label()); mt.addImage(image, 0); mt.waitForAll(); } catch (InterruptedException e) { e.printStackTrace(); } return image; } }

④ 实体类

package top.hqxiaozou.entity; import lombok.Data; /** * @author：邹祥发 * @date：2022/11/25 10:36 * @description：pdf添加签名实体类 */ @Data public class PdfAddContentParam { /** * 要添加的文字 */ private String content; /** * 页码 */ private Integer pageNum; /** * 关键字 */ private String keyword; /** * 文本框坐标（左下角x,y,右上角x,y） */ private Float llx; private Float lly; private Float urx; private Float ury; public PdfAddContentParam() { } public PdfAddContentParam(String content, Integer pageNum, Float llx, Float lly, Float urx, Float ury) { this.content = content; this.pageNum = pageNum; this.llx = llx; this.lly = lly; this.urx = urx; this.ury = ury; } public PdfAddContentParam(String content, String keyword, Float llx, Float lly, Float urx, Float ury) { this.content = content; this.keyword = keyword; this.llx = llx; this.lly = lly; this.urx = urx; this.ury = ury; } }

⑤ 测试类

添加水印 package top.hqxiaozou.test; import top.hqxiaozou.utils.PDFUtils; /** * @author：邹祥发 * @date：2022/11/24 10:41 * @description：PDF水印测试类 */ public class AddWaterMarkTest { public static void main(String[] args) { PDFUtils.addWaterMark("C:/Users/zou/Desktop/阿里巴巴Java开发手册（终极版）.pdf", "C:/Users/zou/Desktop/new.pdf", "https://www.hqxiaozou.top"); } } 插入图片 package top.hqxiaozou.pdf; import top.hqxiaozou.utils.PdfUtil; import com.itextpdf.text.DocumentException; import java.io.IOException; /** * @author：邹祥发 * @date：2022/11/25 14:22 * @description：pdf插入图片测试类 */ public class AddImageTest { public static void main(String[] args) { try { PdfUtil.addImage("C:/Users/zou/Desktop/watermark.pdf", "C:/Users/zou/Desktop/image.pdf", "C:/Users/zou/Desktop/sign.bmp"); } catch (IOException | DocumentException e) { throw new RuntimeException(e); } } } 根据指定坐标往PDF添加文字 package top.hqxiaozou.pdf; import top.hqxiaozou.entity.PdfAddContentParam; import top.hqxiaozou.utils.PdfUtil; import java.nio.file.Files; import java.nio.file.Paths; import java.util.ArrayList; import java.util.Collections; import java.util.List; /** * @author：邹祥发 * @date：2022/11/24 20:30 * @description：根据指定坐标往PDF添加文字内容测试类 */ public class AddTextTest { public static void main(String[] args) { // 按坐标添加批注 PdfAddContentParam name = new PdfAddContentParam("召田最帅boy", 3, 415F, 36F, 610F, 83F); List pdfAddContentParams = new ArrayList(); Collections.addAll(pdfAddContentParams, name); byte[] bytes; try { bytes = PdfUtil.addText("C:/Users/zou/Desktop/image.pdf", pdfAddContentParams); Files.newOutputStream(Paths.get("C:/Users/zou/Desktop/sign.pdf")).write(bytes); } catch (Exception e) { throw new RuntimeException(e); } } } 根据关键字往PDF添加文字 package top.hqxiaozou.pdf; import top.hqxiaozou.entity.PdfAddContentParam; import top.hqxiaozou.utils.PdfUtil; import java.nio.file.Files; import java.nio.file.Paths; import java.util.ArrayList; import java.util.Collections; import java.util.List; /** * @author：邹祥发 * @date：2022/11/25 11:16 * @description：根据关键字往PDF添加文字内容测试类 */ public class AddTextByKeywordTest { public static void main(String[] args) { // 按关键字批注 PdfAddContentParam keyword = new PdfAddContentParam("test", "召田最帅boy", 1F, 2F, 3F, 40F); List pdfAddContentParams = new ArrayList(); Collections.addAll(pdfAddContentParams, keyword); byte[] bytes; try { bytes = PdfUtil.addTextByKeyword("C:/Users/zou/Desktop/target.pdf", pdfAddContentParams); Files.newOutputStream(Paths.get("C:/Users/zou/Desktop/new.pdf")).write(bytes); } catch (Exception e) { throw new RuntimeException(e); } } }

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