pdf转图片【java版实现】

一、引入依赖

引入需要导入到项目中的依赖，如下所示：

        <!-- pdf转图片 --><dependency><groupId>net.sf.cssbox</groupId><artifactId>pdf2dom</artifactId><version>1.7</version></dependency><dependency><groupId>org.apache.pdfbox</groupId><artifactId>pdfbox</artifactId><version>2.0.12</version></dependency><dependency><groupId>org.apache.pdfbox</groupId><artifactId>pdfbox-tools</artifactId><version>2.0.12</version></dependency><!-- https://mvnrepository.com/artifact/com.itextpdf/itextpdf --><dependency><groupId>com.itextpdf</groupId><artifactId>itextpdf</artifactId><version>5.5.13</version></dependency>

二.编写工具类

pdf转图片的工具类如下所示，直接拷贝到项目即可

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.*;public class Pdf2Image {/*** 使用文件流整个pdf转换成图片* @param fileAddress 文件地址 如:C:\\Users\\user\\Desktop\\test* @param filename    PDF文件名不带后缀名* @param type        图片类型 png 、jpg*/public static List<Map<String, String>> pdfToImage(String fileAddress, String filename, String type) {long startTime = System.currentTimeMillis();List<Map<String, String>> list = new ArrayList<>();Map<String, String> resultMap = null;PDDocument pdDocument = null;String fileName = null;String imgPath = null;try {// 将文件地址和文件名拼接成路径 注意：线上环境不能使用\\拼接File FilePath = new File(fileAddress + "/" + filename + ".pdf");// 文件流FileInputStream inputStream = new FileInputStream(FilePath);int dpi = 296;pdDocument = PDDocument.load(inputStream);PDFRenderer renderer = new PDFRenderer(pdDocument);int pageCount = pdDocument.getNumberOfPages();/* dpi越大转换后越清晰，相对转换速度越慢 */for (int i = 0; i < pageCount; i++) {resultMap = new HashMap<>();fileName = filename + "_" + (i + 1) + "." + type;//注意：线上环境不能使用\\拼接imgPath = fileAddress + "/" + fileName;BufferedImage image = renderer.renderImageWithDPI(i, dpi);ImageIO.write(image, type, new File(imgPath));resultMap.put("fileName", fileName);resultMap.put("filePath", imgPath); // 图片路径list.add(resultMap);}long endTime = System.currentTimeMillis();System.out.println("共耗时：" + ((endTime - startTime) / 1000.0) + "秒");  //转化用时} catch (Exception e) {e.printStackTrace();} finally {try {// 这里需要关闭PDDocument，不然如果想要删除pdf文件时会提示文件正在使用，无法删除的情况pdDocument.close();} catch (IOException e) {e.printStackTrace();}}return list;}public static void main(String[] args) throws FileNotFoundException {List<Map<String, String>> maps = pdfToImage("D:\\tanzer\\template\\bwFckHotwork\\110100DW1646870094552236032", "FTEV动用明火审批表20230609192945", "jpg");System.out.println(maps);}
}