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);
    }
}

三.测试

执行工具类中的main方法就行,会将pdf文件转换成多张图片到同级目录中。

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转载自blog.csdn.net/qq_45443475/article/details/132146416