JAVA操作PDF文件

PDF插入表单或图片

PDF插入表单数据前需要对模板进行处理，使用Adobe Acrobat DC 的准备表单功能添加文本域
表单数据MAP里的KEY必须与PDF添加的域名称一致才能添加进去
import com.itextpdf.text.Image;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.*;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.util.HashMap;

 /*** @param templateFilePath PDF模版文件路径* @param data             表单数据* @param imageData        图片文件路径* @param disableEditing   生成后的PDF文件 true不可编辑  false可编辑* @param pdfFilePath      生成后PDF文件路径* @throws Exception*/@Testvoid test(String templateFilePath, HashMap<String, String> data, HashMap<String, String> imageData, boolean disableEditing, String pdfFilePath) throws Exception {PdfReader reader = null;ByteArrayOutputStream bos = null;PdfStamper pdfStamper = null;FileOutputStream fos = null;try {// 读取PDF模版文件reader = new PdfReader(templateFilePath);// 输出流bos = new ByteArrayOutputStream();// 构建PDF对象pdfStamper = new PdfStamper(reader, bos);// 获取表单数据AcroFields form = pdfStamper.getAcroFields();// 使用中文字体 使用 AcroFields填充值的不需要在程序中设置字体，在模板文件中设置字体为中文字体 Adobe 宋体 std LBaseFont bfChinese = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);form.addSubstitutionFont(bfChinese);if (data != null && data.size() > 0) {// 表单赋值for (String key : data.keySet()) {form.setField(key, data.get(key));// 也可以指定字体form.setFieldProperty(key, "textfont", bfChinese, null);}}// 添加图片if (null != imageData && imageData.size() > 0) {for (String key : imageData.keySet()) {int pageNo = form.getFieldPositions(key).get(0).page;Rectangle signRect = form.getFieldPositions(key).get(0).position;float x = signRect.getLeft();float y = signRect.getBottom();// 读图片Image image = Image.getInstance(imageData.get(key));// 获取操作的页面PdfContentByte under = pdfStamper.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);}}pdfStamper.setFormFlattening(disableEditing);pdfStamper.close();// 保存文件fos = new FileOutputStream(pdfFilePath);fos.write(bos.toByteArray());fos.flush();} finally {if (null != fos) {try {fos.close();} catch (Exception e) {e.printStackTrace();}}if (null != bos) {try {bos.close();} catch (Exception e) {e.printStackTrace();}}if (null != reader) {try {reader.close();} catch (Exception e) {e.printStackTrace();}}}}<!--itextPDF依赖--><dependency><groupId>com.itextpdf</groupId><artifactId>itextpdf</artifactId><version>5.5.13.2</version></dependency><dependency><groupId>com.itextpdf</groupId><artifactId>itext-asian</artifactId><version>5.2.0</version></dependency>

PDF转换为图片

多页PDF根据需要可创建文件夹循环存储图片
import org.apache.commons.io.FileUtils;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.ArrayList;
import java.util.List;

@Testvoid test(String pdfSavePath,String imagePath) throws IOException {File newFile = new File(pdfSavePath);byte[] bytes = FileUtils.readFileToByteArray(newFile);List<byte[]> listByte = pdfToImage(bytes);OutputStream oute = new FileOutputStream(new File(imagePath));oute.write(listByte.get(0));oute.flush();oute.close();}/*** PDF转图片* @param fileContent PDF文件的二进制流* @return 图片文件的二进制流*/public  List<byte[]> pdfToImage(byte[] fileContent) throws IOException {// dpi越大转换后越清晰，相对转换速度越慢Integer DPI = 300;//转换后的图片类型String IMG_TYPE = "png";List<byte[]> result = new ArrayList<>();PDDocument document = PDDocument.load(fileContent);ByteArrayOutputStream out =null;try  {PDFRenderer renderer = new PDFRenderer(document);for (int i = 0; i < document.getNumberOfPages(); ++i) {BufferedImage bufferedImage = renderer.renderImageWithDPI(i, DPI);out = new ByteArrayOutputStream();ImageIO.write(bufferedImage, IMG_TYPE, out);result.add(out.toByteArray());}}finally {out.close();document.close();}return result;}<!--pdfbox依赖--><dependency><groupId>org.apache.pdfbox</groupId><artifactId>pdfbox</artifactId><version>2.0.20</version></dependency>

图片压缩处理

import net.coobird.thumbnailator.Thumbnails;
import org.apache.commons.io.FileUtils;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;

@Testvoid test() throws IOException {//输入文件byte[] bytes = FileUtils.readFileToByteArray(new File("C:\\Users\\LZW\\Desktop\\1.jpg"));//根据文件大小调整压缩质量 200*1024=200kb大小Float quality = 0.5f;if (bytes.length > 200 * 1024 && bytes.length < 2000 * 1024) {quality = 0.25f;}if (bytes.length > 4000 * 1024) {quality = 0.2f;}if (bytes.length > 6000 * 1024) {quality = 0.1f;}if (bytes.length > 10000 * 1024) {quality = 0.1f;}//压缩处理ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes);//输出文件Thumbnails.of(byteArrayInputStream).scale(1f).outputQuality(quality).toFile("C:\\Users\\LZW\\Desktop\\new.jpg");}<!-- 图片压缩处理 --><dependency><groupId>net.coobird</groupId><artifactId>thumbnailator</artifactId><version>0.4.14</version></dependency>