通过pdf模板，填充内容，生成pdf文件JAVA

1 概述

　　我们通常会遇到需要生成某些固定格式，但是内容不同的文件，那么我们就可以使用⽤Adobe Acrobat DC来创建pdf模块，然后通过代码对模板进行填充，生成pdf文件

2 创建一个pdf模板文件

2.1 先创建一个word创建我们想要的表单

2.2 把word转换成pdf，如下图，创建了这么一个表单，转成了pdf

 

3 使⽤Adobe Acrobat DC打开PDF⽂件，来创建模板

3.1使用Adobe Acrobat DC打开文件

3.2 点击右边的功能准备表单

 

3.3 点击上面按钮-添加文本域

3.4 把文本域放到我们要填充的地方

 

3.5 填写域名称(后面编码就是根据域名称来填入内容的)

 

 还可以双击这个框框打开设置，设置其他属性

3.6 完成所有的文本域

　　

 

3.7 文件-另存为-保存文件(这个文件就是我们的模板文件了)

4 编码

4.1 pdf-图片工具类

package com.ruoyi.weixin.user.MyTest.Itext;

import net.coobird.thumbnailator.Thumbnails;
import net.coobird.thumbnailator.geometry.Positions;

import javax.imageio.ImageIO;
import java.io.*;

/**
 * @Classname ImageThumbUtil
 * @Description TODO
 * @Date 2022/5/6 0006 下午 4:34
 * @Created by jcc
 */
public class ImageThumbUtils {
    /**
     * 缩略图⽚，图⽚质量为源图的80%
     *
     * @param originalImgPath 源图⽚存储路径
     * @param w               图⽚压缩后的宽度
     * @param h               图⽚压缩后的⾼度
     * @param targetImgPath   缩略图的存放路径
     */
    public static void thumbImage(String originalImgPath, int w, int h, String targetImgPath) throws Exception {
        thumbImage(new FileInputStream(originalImgPath), w, h, targetImgPath, 0.8);
    }

    /**
     * 缩略图⽚，图⽚质量为源图的80%
     *
     * @param originalImgData 源图⽚字节数
     * @param w               图⽚压缩后的宽度
     * @param h               图⽚压缩后的⾼度
     * @param targetImgPath   缩略图的存放路径
     */
    public static void thumbImage(byte[] originalImgData, int w, int h, String targetImgPath) throws Exception {
        thumbImage(new ByteArrayInputStream(originalImgData), w, h, targetImgPath, 0.8);
    }

    /**
     * 按⽐例压缩⽂件
     *
     * @param originalImgData 源⽂件
     * @param compressQalitiy 压缩⽐例
     * @param targetImgPath   ⽬标路径
     */
    public static void thumbImage(byte[] originalImgData, double compressQalitiy, String targetImgPath) throws Exception {
        Thumbnails.of(new ByteArrayInputStream(originalImgData)).scale(1f).outputQuality(compressQalitiy).toFile(targetImgPath);
    }


    /**
     * 按⽐例压缩⽂件
     *
     * @param originalImgData 源⽂件
     * @param compressQalitiy 压缩⽐例
     */
    public static OutputStream thumbImage(byte[] originalImgData, double compressQalitiy) throws Exception {
        OutputStream os = new ByteArrayOutputStream();
        Thumbnails.of(new ByteArrayInputStream(originalImgData)).scale(1f).outputQuality(compressQalitiy).toOutputStream(os);
        return os;
    }

    /**
     * 按尺⼨⽐例缩略
     *
     * @param originalInputSteam 源图输⼊流
     * @param w                  缩略宽
     * @param h                  缩略⾼
     * @param targetImgPath      缩略图存储路径
     * @param compressQalitiy    缩略质量⽐例，0~1之间的数
     */
    public static void thumbImage(InputStream originalInputSteam, int w, int h, String targetImgPath, double compressQalitiy) throws Exception {
        thumbImage(originalInputSteam, w, h, targetImgPath, compressQalitiy, true);
    }

    /**
     * @param originalImgInputSteam 源图⽚输⼊流
     * @param w                     图⽚压缩后的宽度
     * @param h                     图⽚压缩后的⾼度
     * @param targetImgPath         缩略图的存放路径
     * @param compressQalitiy       压缩⽐例，0~1之间的double数字
     * @param keepAspectRatio       是否保持等⽐例压缩，是true，不是false
     */
    public static void thumbImage(InputStream originalImgInputSteam, int w, int h, String targetImgPath, double compressQalitiy,
                                  boolean keepAspectRatio) throws Exception {
        Thumbnails.of(originalImgInputSteam).size(w, h).outputQuality(Double.valueOf(compressQalitiy)).keepAspectRatio(true).toFile(targetImgPath);
    }

    /**
     * 图⽚裁剪
     *
     * @param originalImgPath 源图⽚路径
     * @param targetImgPath   新图⽚路径
     * @param position        位置 0正中间，1中间左边，2中间右边，3底部中间，4底部左边，5底部右边，6顶部中间，7顶部左边，8顶部右边，
     *                        其他为默认正中间
     * @param w               裁剪宽度
     * @param h               裁剪⾼度
     * @throws Exception
     */
    public static void crop(String originalImgPath, int position, int w, int h, String targetImgPath) throws Exception {
        Thumbnails.of(originalImgPath).sourceRegion(getPositions(position), w, h).size(w, h).outputQuality(1).toFile(targetImgPath);
    }

    /**
     * 给图⽚添加⽔印
     *
     * @param originalImgPath  将被添加⽔印图⽚ 路径
     * @param targetImgPath    含有⽔印的新图⽚路径
     * @param watermarkImgPath ⽔印图⽚
     * @param position         位置 0正中间，1中间左边，2中间右边，3底部中间，4底部左边，5底部右边，6顶部中间，7顶部左边，8顶部右边，
     *                         其他为默认正中间
     * @param opacity          不透明度,取0~1之间的float数字，0完全透明，1完全不透明
     * @throws Exception
     */
    public static void watermark(String originalImgPath, String watermarkImgPath, int position, float opacity, String targetImgPath)
            throws Exception {
        Thumbnails.of(originalImgPath).watermark(getPositions(position), ImageIO.read(new File(watermarkImgPath)), opacity).scale(1.0)
                .outputQuality(1).toFile(targetImgPath);
    }

    private static Positions getPositions(int position) {
        Positions p = Positions.CENTER;
        switch (position) {
            case 0: {
                p = Positions.CENTER;
                break;
            }
            case 1: {
                p = Positions.CENTER_LEFT;
                break;
            }
            case 2: {
                p = Positions.CENTER_RIGHT;
                break;
            }
            case 3: {
                p = Positions.BOTTOM_CENTER;
                break;
            }
            case 4: {
                p = Positions.BOTTOM_LEFT;
                break;
            }
            case 5: {
                p = Positions.BOTTOM_RIGHT;
                break;
            }
            case 6: {
                p = Positions.TOP_CENTER;
                break;
            }
            case 7: {
                p = Positions.TOP_LEFT;
                break;
            }
            case 8: {
                p = Positions.TOP_RIGHT;
                break;
            }
            default: {
                p = Positions.CENTER;
                break;
            }
        }
        return p;
    }

    public static void main(String[] args) throws Exception {
        thumbImage("d:/pdf/1.jpg", 600, 600, "d:/pdf/2.jpg");
        crop("d:/pdf/1.jpg", 7, 200, 300, "d:/pdf/2.jpg");
        watermark("d:/pdf/1.jpg", "d:/pdf/2.jpg", 7, 1, "d:/pdf/3.jpg");
    }
}

4.2 根据模板，填充内容，生成pdf文件工具类

/**
 * @Classname PdfUtils
 * @Description TODO
 * @Date 2022/5/6 0006 下午 4:40
 * @Created by jcc
 */
import com.itextpdf.text.Document;
import com.itextpdf.text.pdf.*;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.*;
import java.util.List;
/**
 * Description: PdfUtils <br>
 * 依赖的包：itextpdf itext-asian
 * commons-io,commons-codec
 * @author mk
 * @Date 2018-11-2 14:32 <br>
 * @Param
 * @return
 */
public class PdfUtils {

    public static void main(String[] args) throws IOException {
　　　　　　//注意，这里构建map，key和value都要是String
        HashMap map = new HashMap<String, String>();
　　　　　//姓名
        map.put("customerAsex", "陈晓");
        // 年龄
        map.put("customerAage", "13");
        // String path = PdfUtils.class.getResource("/template").getPath();
        // System.out.println("path:"+path);
        // String sourceFile = path + File.separator + "test.pdf";
        //模板文件
        String sourceFile = "C:\\Users\\Administrator\\Desktop\\muban.pdf";
        //生成的pdf文件(自己随便定义)
        String targetFile = "C:\\Users\\Administrator\\Desktop\\test_fill.pdf";
        genPdf(map,sourceFile,targetFile);
        // System.out.println("获取pdf表单中的fieldNames:"+getTemplateFileFieldNames(sourceFile));
        // System.out.println("读取⽂件数组:"+fileBuff(sourceFile));
        // System.out.println("pdf转图⽚:"+pdf2Img(new File(targetFile),imageFilePath));
    }

    /*
     *
     * @Description TOOD
     * @param map      我们要填充的内容，key是pdf模板文本域的名称，value是要填充内容
     * @param sourceFile    模板文件路径
     * @param targetFile    生成的pdf文件路径
     * @return void
     * @date 2022/5/6 0006 下午 5:39
     * @author jcc
     */
    private static void genPdf(HashMap map, String sourceFile, String targetFile) throws IOException {
        File templateFile = new File(sourceFile);
        fillParam(map, FileUtils.readFileToByteArray(templateFile), targetFile);
    }

    /**
     * Description: 使⽤map中的参数填充pdf，map中的key和pdf表单中的field对应 <br>
     * @author mk
     * @Date 2018-11-2 15:21 <br>
     * @Param
     * @return
     */
    public static void fillParam(Map<String, String> fieldValueMap, byte[] file, String contractFileName) {
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(contractFileName);
            PdfReader reader = null;
            PdfStamper stamper = null;
            BaseFont base = null;
            try {
                reader = new PdfReader(file);
                stamper = new PdfStamper(reader, fos);
                stamper.setFormFlattening(true);
                base = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
                AcroFields acroFields = stamper.getAcroFields();
                for (String key : acroFields.getFields().keySet()) {
                    acroFields.setFieldProperty(key, "textfont", base, null);
                    acroFields.setFieldProperty(key, "textsize", new Float(9), null);
                }
                if (fieldValueMap != null) {
                    for (String fieldName : fieldValueMap.keySet()) {
                        acroFields.setField(fieldName, fieldValueMap.get(fieldName));
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (stamper != null) {
                    try {
                        stamper.close();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
                if (reader != null) {
                    reader.close();
                }
            }
    } catch (Exception e) {
        System.out.println("填充参数异常");
        e.printStackTrace();
    } finally {
        IOUtils.closeQuietly(fos);
    }
}
    /**
     * Description: 获取pdf表单中的fieldNames<br>
     * @author mk
     * @Date 2018-11-2 15:21 <br>
     * @Param
     * @return
     */
    public static Set<String> getTemplateFileFieldNames(String pdfFileName) {
        Set<String> fieldNames = new TreeSet<String>();
        PdfReader reader = null;
        try {
            reader = new PdfReader(pdfFileName);
            Set<String> keys = reader.getAcroFields().getFields().keySet();
            for (String key : keys) {
                int lastIndexOf = key.lastIndexOf(".");
                int lastIndexOf2 = key.lastIndexOf("[");
                fieldNames.add(key.substring(lastIndexOf != -1 ? lastIndexOf + 1 : 0, lastIndexOf2 != -1 ? lastIndexOf2 : key.length()));
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                reader.close();
            }
        }
        return fieldNames;
    }
    /**
     * Description: 读取⽂件数组<br>
     * @author mk
     * @Date 2018-11-2 15:21 <br>
     * @Param
     * @return
     */
    public static byte[] fileBuff(String filePath) throws IOException {
        File file = new File(filePath);
        long fileSize = file.length();
        if (fileSize > Integer.MAX_VALUE) {
//System.out.println("file too big...");
            return null;
        }
        FileInputStream fi = new FileInputStream(file);
        byte[] file_buff = new byte[(int) fileSize];
        int offset = 0;
        int numRead = 0;
        while (offset < file_buff.length && (numRead = fi.read(file_buff, offset, file_buff.length - offset)) >= 0) {
            offset += numRead;
        }
// 确保所有数据均被读取
        if (offset != file_buff.length) {
            throw new IOException("Could not completely read file " + file.getName());
        }
        fi.close();
        return file_buff;
    }

    /**
     * Description: 合并pdf <br>
     * @author mk
     * @Date 2018-11-2 15:21 <br>
     * @Param
     * @return
     */
    public static void mergePdfFiles(String[] files, String savepath) {
        Document document = null;
        try {
            document = new Document(); //默认A4⼤⼩
            PdfCopy copy = new PdfCopy(document, new FileOutputStream(savepath));
            document.open();
            for (int i = 0; i < files.length; i++) {
                PdfReader reader = null;
                try {
                    reader = new PdfReader(files[i]);
                    int n = reader.getNumberOfPages();
                    for (int j = 1; j <= n; j++) {
                        document.newPage();
                        PdfImportedPage page = copy.getImportedPage(reader, j);
                        copy.addPage(page);
                    }
                } finally {
                    if (reader != null) {
                        reader.close();
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
//关闭PDF⽂档流，OutputStream⽂件输出流也将在PDF⽂档流关闭⽅法内部关闭
            if (document != null) {
                document.close();
            }
        }
    }
    /**
     * pdf转图⽚
     * @param file pdf
     * @return
     */
    public static boolean pdf2Img(File file,String imageFilePath) {
        try {
//⽣成图⽚保存
            byte[] data = pdfToPic(PDDocument.load(file));
            File imageFile = new File(imageFilePath);
            ImageThumbUtils.thumbImage(data, 1, imageFilePath); //按⽐例压缩图⽚
            System.out.println("pdf转图⽚⽂件地址:" + imageFilePath);
            return true;
        } catch (Exception e) {
            System.out.println("pdf转图⽚异常：");
            e.printStackTrace();
        }
        return false;
    }
    /**
     * pdf转图⽚
     * pdf转图⽚
     */
    private static byte[] pdfToPic(PDDocument pdDocument) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        List<BufferedImage> piclist = new ArrayList<BufferedImage>();
        try {
            PDFRenderer renderer = new PDFRenderer(pdDocument);
            for (int i = 0; i < pdDocument.getNumberOfPages(); i++) {//
        // 0 表⽰第⼀页，300 表⽰转换 dpi，越⼤转换后越清晰，相对转换速度越慢
                BufferedImage image = renderer.renderImageWithDPI(i, 108);
                piclist.add(image);
            }
        // 总⾼度 总宽度 临时的⾼度 , 或保存偏移⾼度 临时的⾼度，主要保存每个⾼度
            int height = 0, width = 0, _height = 0, __height = 0,
        // 图⽚的数量
                    picNum = piclist.size();
        // 保存每个⽂件的⾼度
            int[] heightArray = new int[picNum];
        // 保存图⽚流
            BufferedImage buffer = null;
        // 保存所有的图⽚的RGB
            List<int[]> imgRGB = new ArrayList<int[]>();
        // 保存⼀张图⽚中的RGB数据
            int[] _imgRGB;
            for (int i = 0; i < picNum; i++) {
                buffer = piclist.get(i);
                heightArray[i] = _height = buffer.getHeight();// 图⽚⾼度
                if (i == 0) {
        // 图⽚宽度
                    width = buffer.getWidth();
                }
        // 获取总⾼度
                height += _height;
        // 从图⽚中读取RGB
                _imgRGB = new int[width * _height];
                _imgRGB = buffer.getRGB(0, 0, width, _height, _imgRGB, 0, width);
                imgRGB.add(_imgRGB);
            }
        // 设置偏移⾼度为0
            _height = 0;
        // ⽣成新图⽚
            BufferedImage imageResult = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            int[] lineRGB = new int[8 * width];
            int c = new Color(128, 128, 128).getRGB();
            for (int i = 0; i < lineRGB.length; i++) {
                lineRGB[i] = c;
            }
            for (int i = 0; i < picNum; i++) {
                __height = heightArray[i];
        // 计算偏移⾼度
                if (i != 0)
                    _height += __height;
                imageResult.setRGB(0, _height, width, __height, imgRGB.get(i), 0, width); // 写⼊流中
        // 模拟页分隔
                if (i > 0) {
                    imageResult.setRGB(0, _height + 2, width, 8, lineRGB, 0, width);
                }
            }
        // 写流
            ImageIO.write(imageResult, "jpg", baos);
        } catch (Exception e) {
            System.out.println("pdf转图⽚异常：");
            e.printStackTrace();
        } finally {
            IOUtils.closeQuietly(baos);
            try {
                pdDocument.close();
            } catch (Exception ignore) {
            }
        }
        return baos.toByteArray();
    }
}

4.3 测试结果

 　　测试代码中，只填了customerAname和customerAage到map中，所以这里只填入了左边的某些和年龄