说明

iText 是Java 操作 PDF 的工具，提供编辑 PDF，包括添加文字、图片等功能

maven 依赖

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 <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>

 <dependency>
   <groupId>org.projectlombok</groupId>
   <artifactId>lombok</artifactId>
   <optional>true</optional>
</dependency>

PDFUtil.java

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package com.example.pdfjava;

import com.itextpdf.text.Font;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
import lombok.Data;
import lombok.experimental.Accessors;

import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;

public class PDFUtil {

    public static void main(String[] args) {
       // String[] files = {"/Users/wangwz/IdeaProjects/tools/spire-word/1.pdf",
        //                     "/Users/wangwz/IdeaProjects/tools/spire-word/2.pdf",
        //                     "/Users/wangwz/IdeaProjects/tools/spire-word/3.pdf"};
        // String outputPath= "/Users/wangwz/IdeaProjects/tools/spire-word/out.pdf";
        // mergePDF(files,outputPath);
      
        String pdfPath_in = "/Users/wangwz/Downloads/1.pdf";
        String pdfPath_out = "/Users/wangwz/Downloads/2.pdf";
        List<ImageParams> imageParams = new ArrayList<>(2);
        imageParams.add(new ImageParams().setPage(1).setType(0).setX(200f).setY(300f).setImageFilePath("/Users/wangwz/Downloads/1.jpg"));
        imageParams.add(new ImageParams().setPage(2).setType(1).setX(100f).setY(400f).setImageFilePath("/Users/wangwz/Downloads/3.png"));
        generatePDF(pdfPath_in, pdfPath_out, imageParams);
    }

    public static final Integer IMAGEWIDTH = 64; //图片宽度
    public static final Integer IMAGEHEIGHT = 90; //图片高度

    /**
     * 给 PDF 加图片
     * @param pdfPath_in
     * @param pdfPath_out
     * @param imageParams
     */
    public static void generatePDF(String pdfPath_in, String pdfPath_out, List<ImageParams> imageParams) {
        PdfReader reader = null;
        PdfStamper stamper = null;
        try {
            //创建一个pdf读入流
            reader = new PdfReader(pdfPath_in);
            stamper = new PdfStamper(reader, new FileOutputStream(pdfPath_out));
            //这个字体是itext-asian.jar中自带的 所以不用考虑操作系统环境问题.
            BaseFont bf = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
            //baseFont不支持字体样式设定.但是font字体要求操作系统支持此字体会带来移植问题.
            Font font = new Font(bf, 10);
            font.setStyle(Font.BOLD);
            font.getBaseFont();
            PdfContentByte over;

            for (ImageParams imageParam : imageParams) {
                //页数是从1开始的
                //获得pdfstamper在当前页的上层打印内容.也就是说 这些内容会覆盖在原先的pdf内容之上.
                over = stamper.getOverContent(imageParam.getPage());

                //创建一个image对象
                Image image = Image.getInstance(imageParam.getImageFilePath());
                image.setAbsolutePosition(imageParam.getX(), imageParam.getY());
                //设置插入的图片大小
                float width = image.getWidth();
                System.out.println("width = " + width);
                float height = image.getHeight();
                System.out.println("height = " + height);
                image.scaleToFit(width, height);
                over.addImage(image);
            }

            stamper.close();
            reader.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
  
   /**
     * 合并多个 PDF
     * @param pdfPath_in
     * @param pdfPath_out
     * @param imageParams
     */
   public static void mergePDF(String[] files, String outputPath) {
        String sep = java.io.File.separator;
        Document document = null;
        PdfCopy copy = null;
        PdfReader reader = null;
        try {
            document = new Document(new PdfReader(files[0]).getPageSize(1));
            copy = new PdfCopy(document, new FileOutputStream(outputPath));
            document.open();
            for (int i = 0; i < files.length; i++) {
                reader = new PdfReader(files[i]);
                int numberOfPages = reader.getNumberOfPages();
                for (int j = 1; j <= numberOfPages; j++) {
                    document.newPage();
                    PdfImportedPage page = copy.getImportedPage(reader, j);
                    copy.addPage(page);
                }
            }
        } catch (IOException e) {
        } catch (DocumentException e) {
        } finally {
            if (document != null)
                document.close();
            if (reader != null)
                reader.close();
            if (copy != null)
                copy.close();
        }
    }
}

@Accessors(chain = true)
@Data
class ImageParams {
    private Float x;
    private Float y;
    private Integer page; //所在页码
    private Integer type;  //1-签名 0-指纹
    private String picdata; //base64 数据
    private String imageFilePath; //图片路径
}