<dependency>  <groupId>com.itextpdf</groupId>  <artifactId>itextpdf</artifactId>  <version>5.5.6</version></dependency><!-- itextpdf的亞洲字體支持 --><dependency>  <groupId>com.itextpdf</groupId>  <artifactId>itext-asian</artifactId>  <version>5.2.0</version></dependency>

public static void main(String[] args) throws Exception {    // 模板文件路徑    String templatePath = "template.pdf";    // 生成的文件路徑    String targetPath = "target.pdf";    // 書簽名    String fieldName = "field";    // 圖片路徑    String imagePath = "image.jpg";    // 讀取模板文件    InputStream input = new FileInputStream(new File(templatePath));    PdfReader reader = new PdfReader(input);    PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(targetPath));    // 提取pdf中的表單    AcroFields form = stamper.getAcroFields();    form.addSubstitutionFont(BaseFont.createFont("STSong-Light","UniGB-UCS2-H", BaseFont.NOT_EMBEDDED));    // 通過域名獲取所在頁和坐標，左下角為起點    int pageNo = form.getFieldPositions(fieldName).get(0).page;    Rectangle signRect = form.getFieldPositions(fieldName).get(0).position;    float x = signRect.getLeft();    float y = signRect.getBottom();    // 讀圖片    Image image = Image.getInstance(imagePath);    // 獲取操作的頁面    PdfContentByte under = stamper.getOverContent(pageNo);    // 根據域的大小縮放圖片    image.scaleToFit(signRect.getWidth(), signRect.getHeight());    // 添加圖片    image.setAbsolutePosition(x, y);    under.addImage(image);    stamper.close();    reader.close();  }