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Java实现给PDF文件加水印、图片、签名（含测试类）

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

<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itextpdf</artifactId>
    <version>5.5.13</version>
</dependency>
<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itext-asian</artifactId>
    <version>5.2.0</version>
</dependency>

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 < total; i++) {
                pageRect = reader.getPageSizeWithRotation(i);
                //在字体下方加水印
                under = stamper.getOverContent(i);
                under.beginText();
                under.saveState();
                under.setGState(gs);
                //这里修改水印字体大小
                under.setFontAndSize(base, 36);
                //这里设置字体上下间隔
                for (int height = interval + textH; height < pageRect.getHeight(); height = height + textH * 9) {
                    //这里设置字体左右间隔
                    for (int width = interval + textW; width < pageRect.getWidth() + textW; width = width + textW * 4) {
                        //这里设置倾斜角度
                        under.showTextAligned(Element.ALIGN_LEFT, waterMarkName, width - textW, height - textH, 45);
                    }
                }
                under.endText();
            }
            stamper.close();
            reader.close();
        } catch (Exception e) {
            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<PdfAddContentParam> 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<PdfAddContentParam> 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 <= pageNum; page++) {
                if (hasKeyword[0]) {
                    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 <= pdfPages; i++) {
            //图片处理
            Image img = Image.getInstance(ImageUtil.imageToBytes((bufferedImage), "png"));
            //设置图片大小
            img.scaleAbsolute(192, 100);
            img.setTransparency(new int[0]);
            //设置图片位置
            img.setAbsolutePosition(x, y);
            stamper.getOverContent(i).addImage(img);
        }
        //关闭资源
        stamper.close();
        out.close();
        reader.close();
    }
}

③ 工具类ImageUtil

package top.hqxiaozou.utils;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

/**
 * @author：邹祥发
 * @date：2022/11/25 14:14
 * @description：转换BufferedImage数据为byte数组
 */
public class ImageUtil {

    /**
     * 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<PdfAddContentParam> 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<PdfAddContentParam> 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);
        }
    }
}

悦读

道可道，非常道；名可名，非常名。 无名，天地之始，有名，万物之母。 故常无欲，以观其妙，常有欲，以观其徼。 此两者，同出而异名，同谓之玄，玄之又玄，众妙之门。

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