SpringBoot对PDF进行模板内容填充与电子签名合并详解

<!--		pdf编辑相关-->
<dependency>
  <groupId>com.itextpdf</groupId>
  <artifactId>itextpdf</artifactId>
  <version>5.5.13.3</version>
</dependency>

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

import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.*;
import org.apache.commons.lang3.StringUtils;

import java.io.*;
import java.util.HashMap;
import java.util.Map;

/**
 * @desc: pdf编辑相关工具类
 * @author: lc
 * @since: 2023/12/13
 */
public class PdfUtils {
    /**
     * 利用模板生成pdf保存到某路径下
     */
    public static void pdfOut(Map<String, Object> map) throws IOException, DocumentException {
        // 模板路径
        String templatePath = (String) map.get("templatePath");
        //新的pdf文件
        String newPdfPath = (String) map.get("newPdfPath");
        //签字图片的地址
        String signPath = (String) map.get("signPath");
        File file1 = new File(newPdfPath);
        if (!file1.exists()) {
            try {
                file1.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        //pdf模板文件
        InputStream input = new FileInputStream(templatePath);
        //生成的新文件
        File file = new File(newPdfPath);
        FileOutputStream fos = new FileOutputStream(file);
        PdfReader reader = new PdfReader(input);
        PdfStamper stamper = new PdfStamper(reader, fos);
        // 提取PDF中的表单
        AcroFields form = stamper.getAcroFields();
        // 设置中文字体
        String prefixFont = "";
        String os = System.getProperties().getProperty("os.name");
        if (os.startsWith("win") || os.startsWith("Win")) {
            prefixFont = "C:\\Windows\\Fonts" + File.separator;
        } else {
            prefixFont = "/usr/share/fonts/chinese" + File.separator;
        }
        BaseFont baseFont = BaseFont.createFont(prefixFont + "simsun.ttc,0", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
        form.addSubstitutionFont(baseFont);
        //文字类的内容处理
        Map<String, String> datemap = (Map<String, String>) map.get("dateMap");
        //填充值
        for (String key : datemap.keySet()) {
            String value = datemap.get(key);
            //设置字体大小
            form.setFieldProperty(key, "textsize", 12f, null);
            form.setField(key, value);
        }
        //签名图片路径存在才进行图片合并
        if (StringUtils.isNotBlank(signPath)){
            //进行签字的填充
            int pageNo = form.getFieldPositions("sign").get(0).page;
            Rectangle signRect = form.getFieldPositions("sign").get(0).position;
            float x = signRect.getLeft();
            float y = signRect.getBottom();
            //读取图片
            Image image = Image.getInstance(signPath);
            //获取操作的页面
            PdfContentByte content = stamper.getOverContent(pageNo);
            // 根据域的大小缩放图片
            image.scaleToFit(signRect.getWidth(), signRect.getHeight());
            // 添加图片
            image.setAbsolutePosition(x, y);
            content.addImage(image);
            fos.flush();
        }
        // 生成PDF
        stamper.setFormFlattening(true);
        stamper.close();
        reader.close();
        fos.close();
        input.close();
    }

    public static void main(String[] args) throws DocumentException, IOException {
        Map<String, Object> params = new HashMap<>();
        //测试数据
        HashMap<String, Object> map = new HashMap<>();
        map.put("username","测试号");
        map.put("name1","张三");
        map.put("name2","李四");
        map.put("sex","男");
        map.put("address","8号楼");
        //需要赋值的模板内容
        params.put("dateMap",map);
        //模板位置
        String templatePath = "C:\\Users\\lc\\Desktop\\test.pdf";
        //新生成pdf文件位置
        String newPdfPath = "C:\\Users\\lc\\Desktop\\test1.pdf";
        //签名图片位置
        String signPath = "C:\\Users\\lc\\Desktop\\qs.png";
        params.put("templatePath",templatePath);
        params.put("newPdfPath",newPdfPath);
        params.put("signPath",signPath);
        pdfOut(params);
    }

}