Java如何使用itext向PDF插入数据和图片

import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.*;

import java.io.*;

import java.nio.file.Files;
import java.util.Calendar;
import java.util.HashMap;
import java.util.Map;

public class PDFUtil {

    private static void insertImage(AcroFields form, PdfStamper stamper, String filedName, String url) throws IOException, DocumentException {
        int pageNo = form.getFieldPositions(filedName).get(0).page;
        Rectangle signRect = form.getFieldPositions(filedName).get(0).position;
        float x = signRect.getLeft();
        float y = signRect.getBottom();

        Image image = Image.getInstance(url);
        // 获取操作的页面
        PdfContentByte under = 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);
        under.addImage(image);
    }

    public static Boolean pdfTemplateInsert(String templateUrl, String outputFileUrl, Map<String, Object> templateValueMap, Map<String, String> templateImageMap) {
        boolean success = true;

        OutputStream os = null;
        PdfStamper ps = null;
        PdfReader reader = null;
        try {
            os = Files.newOutputStream(new File(outputFileUrl).toPath());
            //读取pdf表单
            reader = new PdfReader(templateUrl);
            //根据表单生成一个新的pdf文件
            ps = new PdfStamper(reader, os);
            //获取pdf表单
            AcroFields form = ps.getAcroFields();
            //给表单中添加中文字体
            BaseFont bf = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
            form.addSubstitutionFont(bf);
            if (null != templateValueMap && !templateValueMap.isEmpty()) {
                for (String key : templateValueMap.keySet()) {
                    form.setField(key, String.valueOf(templateValueMap.get(key)));
                }
            }

            if (null != templateImageMap && !templateImageMap.isEmpty()) {
                for (String key : templateImageMap.keySet()) {
                    insertImage(form, ps, key, templateImageMap.get(key));
                }
            }
            ps.setFormFlattening(true);
        } catch (Exception e) {
            success = false;
        } finally {
            try {
                ps.close();
                reader.close();
                os.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return success;
    }

    public static void main(String[] args) {
        //模板路径
        String inputUrl = "E:/Desktop/test/demo/itext-demo.pdf";
        //生成的文件路径
        String outputUrl = "E:/Desktop/test/demo/itext-demo-output.pdf";
        Map<String, Object> data = new HashMap<>();
        data.put("name", "张山");
        data.put("year", "2000年10月");
        data.put("phone", "13032451234");
        data.put("gangwei", "Java开发");
        data.put("introduceOneself", "熟练使用Java常用框架：Spring 、mybatis等");
        //图片地址
        String imageUrl = "E:/Desktop/test/demo/1.jpeg";
        Map<String, String> templateImageMap = new HashMap<>();
        templateImageMap.put("image", imageUrl);

        PDFUtil.pdfTemplateInsert(inputUrl, outputUrl, data, templateImageMap);
    }
}