在PDF指定位置添加數據

第一種方案 使用itext填充靜態PDF模板 然後生成PDF新文件

1 使用Adobe Acrobat 編輯原PDF 添加文本域

itext依賴

        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itextpdf</artifactId>
            <version>5.5.9</version>
        </dependency>
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itext-asian</artifactId>
            <version>5.2.0</version>
        </dependency>

代碼實現

import com.itextpdf.text.pdf.AcroFields;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;

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

/**
 * 操作PDF
 *
 * @Author liguangcheng
 * @Date 2022/6/11 09:26
 * @Vision 1.0
 **/
public class PDFTest {
    public static void main(String[] args) throws Exception {
        String filePath = "test.pdf";
        PdfReader reader = new PdfReader(filePath);
        PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("test-副本.pdf"));
        //使用中文字體
        BaseFont bf = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
        ArrayList<BaseFont> fontList = new ArrayList<>();
        fontList.add(bf);

        AcroFields acroFields = stamper.getAcroFields();
        acroFields.setSubstitutionFonts(fontList);

        //設置欄位
        acroFields.setField("name", "測試姓名");
        acroFields.setField("age", "18");
        stamper.setFormFlattening(true);
        stamper.close();
    }
}

test-副本.pdf效果

第二種方案 通過坐標定位 然後添加水印

import com.itextpdf.awt.geom.Rectangle2D;
import com.itextpdf.text.BaseColor;
import com.itextpdf.text.Element;
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 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.Getter;
import lombok.Setter;

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

/**
 * 操作PDF
 *
 * @Author liguangcheng
 * @Date 2022/6/11 09:26
 * @Vision 1.0
 **/
public class PDFTest {
    public static void main(String[] args) throws Exception {

        List<String> keywordList = new ArrayList();
        keywordList.add("測試姓名");
        keywordList.add("18");
        List<PdfItextModel> pdfItextModels = new ArrayList<>();
        for (String keyword : keywordList) {
            float[] keyWordsByPath = getKeyWords("test-副本.pdf", keyword);
            PdfItextModel pdfItextModel = new PdfItextModel();
            pdfItextModel.setContent("水印" +keyword);
            for (int i = 0; i < keyWordsByPath.length; i++) {
                pdfItextModel.setXCoordinate(keyWordsByPath[0]);//x坐標
                pdfItextModel.setYCoordinate(keyWordsByPath[1]);//y坐標
                pdfItextModel.setPageNum((int) keyWordsByPath[2]);//頁數
                System.out.println(keyword + "坐標值:" + keyWordsByPath[i]);
            }
            pdfItextModels.add(pdfItextModel);
        }
        signSinglePsw("test.pdf", pdfItextModels);
    }


    /**
     * @param filepath 文件位置
     * @param keyWords 關鍵字
     * @return float[]
     * @Description 獲取關鍵字所在PDF坐標
     */
    private static float[] getKeyWords(String filepath, String keyWords) {
        float[] coordinate = null;
        int page = 0;
        try {
            PdfReader pdfReader = new PdfReader(filepath);
            int pageNum = pdfReader.getNumberOfPages();
            PdfReaderContentParser pdfReaderContentParser = new PdfReaderContentParser(pdfReader);
            CustomRenderListener renderListener = new CustomRenderListener();
            renderListener.setKeyWord(keyWords);
            for (page = 1; page <= pageNum; page++) {
                renderListener.setPage(page);
                pdfReaderContentParser.processContent(page, renderListener);
                coordinate = renderListener.getPcoordinate();
                if (coordinate != null) break;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return coordinate;
    }


    @Getter
    @Setter
    static class CustomRenderListener implements RenderListener {

        private float[] pcoordinate = null;

        private String keyWord;

        private int page;

        @Override
        public void beginTextBlock() {
        }

        @Override
        public void endTextBlock() {
        }

        @Override
        public void renderImage(ImageRenderInfo arg0) {
        }

        @Override
        public void renderText(TextRenderInfo textRenderInfo) {
            String text = textRenderInfo.getText();
            if (null != text && text.contains(keyWord)) {
                Rectangle2D.Float boundingRectange = textRenderInfo.getBaseline().getBoundingRectange();
                pcoordinate = new float[3];
                pcoordinate[0] = boundingRectange.x;
                pcoordinate[1] = boundingRectange.y;
                pcoordinate[2] = page;
            }
        }

    }

    /**
     * @param oldPswFilePath 原來的文件地址
     * @param list           需要添加的詳細信息
     * @return
     */
    public static String signSinglePsw(String oldPswFilePath, List<PdfItextModel> list) throws Exception {

        int lastIndex = oldPswFilePath.lastIndexOf('.');
        // 獲取文件尾碼
        String suffix = oldPswFilePath.substring(lastIndex + 1);
        // 判斷是否為pdf文件
        if (!"pdf".equalsIgnoreCase(suffix)) {
            throw new RuntimeException("Not is PDF file");
        }

        // 生成新的文件路徑
        String newPswPath = oldPswFilePath.substring(0, lastIndex) + "-副本1." + suffix;
        System.out.println("單個psw文件簽名生成的新路徑：" + newPswPath);

        //解析文件
        PdfReader reader = new PdfReader(oldPswFilePath);
        FileOutputStream fOut = new FileOutputStream(newPswPath);
        PdfStamper stp = new PdfStamper(reader, fOut);

        // 總頁數
        System.out.println("PDF總頁數：" + reader.getNumberOfPages());

        for (PdfItextModel model : list) {
            Float xCoordinate = model.getXCoordinate();
            Float yCoordinate = model.getYCoordinate();
            Integer pageNum = model.getPageNum();
            String content = model.getContent();
            if (xCoordinate == null || yCoordinate == null ||
                    pageNum == null || pageNum == 0 || content == null || "".equals(content)) {
                continue;
            }
            PdfContentByte pdfContentByte = stp.getOverContent(pageNum);
            pdfContentByte.beginText();
            // 設置字體及字型大小
            pdfContentByte.setFontAndSize(getBaseFont(), 14);
            addDeptReview(xCoordinate, yCoordinate, pdfContentByte, content);
            pdfContentByte.endText();
        }
        stp.close();
        // 將輸出流關閉
        fOut.close();
        reader.close();
        // 文件讀寫結束
        System.out.println("PSW文件讀寫完畢");

        return newPswPath;
    }

    // 獲取基礎文字
    public static BaseFont getBaseFont() throws Exception {
        BaseFont base = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", false);
        return base;
    }

    /**
     * @param content
     * @param keyword
     * @param x       X軸坐標
     * @param y       Y軸坐標
     * @Description 添加水印
     */
    private static void addDeptReview(float x, float y, PdfContentByte content, String keyword) {
        content.setColorFill(BaseColor.BLACK);
        // 設置水印位置和內容
        System.out.println("水印內容：" + keyword);
        System.out.println("列印位置坐標：" + x + "," + y);
        content.showTextAligned(Element.ALIGN_LEFT, keyword, x, y, 0);
    }

    @Getter
    @Setter
    static class PdfItextModel {
        //  X坐標
        private Float xCoordinate;
        //Y坐標
        private Float yCoordinate;
        //頁碼
        private Integer pageNum;
        //內容
        private String content;
        
        public PdfItextModel() {
        }
    }
}

找到test.副本.pdf中關鍵字坐標

通過test.pdf空白模板生成新的文件test.副本1.pdf並添加水印

參考博客[https://blog.51cto.com/u_15127609/3272726]

參考博客[https://www.cnblogs.com/alphajuns/p/12436332.html]
參考博客[https://blog.csdn.net/k_young1997/article/details/103512997]