java之pdf文件转image文件

最新推荐文章于 2025-10-29 00:41:36 发布

原创最新推荐文章于 2025-10-29 00:41:36 发布 · 1.4k 阅读

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文章标签：

#java #pdf #apache

该代码示例展示了如何利用ApachePDFBox库和Hutool工具包将PDF文档的每一页转换为JPEG图片，同时提供了调整DPI以控制图片质量的功能。转换后的图片以二进制流的形式存储，并可进一步保存到本地文件系统。

pom文件

工具类

测试代码

pom文件

<!-- https://mvnrepository.com/artifact/org.apache.pdfbox/pdfbox -->
<dependency>
    <groupId>org.apache.pdfbox</groupId>
    <artifactId>pdfbox</artifactId>
    <version>2.0.28</version>
</dependency>

<!--hutool工具-->
<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.8.19</version>
</dependency>

工具类

import cn.hutool.core.date.DateUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;

/**
 * @描述:
 * @Date: 2023/6/3 15:05
 * @Description: // PC002
 * @Author: Duys
 **/
@Slf4j
public class PdfToImageUtil {

    /**
     * dpi越大转换后越清晰，相对转换速度越慢
     */
    private static final Integer DPI = 100;

    /**
     * 转换后的图片类型
     */
    private static final String IMG_TYPE = "jpg";

    /**
     * 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 static List<byte[]> pdfToImage(byte[] fileContent) throws IOException {
        List<byte[]> result = new ArrayList<>();
        try (PDDocument document = PDDocument.load(fileContent)) {
            PDFRenderer renderer = new PDFRenderer(document);
            for (int i = 0; i < document.getNumberOfPages(); ++i) {
                BufferedImage bufferedImage = renderer.renderImageWithDPI(i, DPI);
                ByteArrayOutputStream out = new ByteArrayOutputStream();
                ImageIO.write(bufferedImage, IMG_TYPE, out);
                result.add(out.toByteArray());
            }
        }
        return result;
    }

    /**
     * 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 static byte[] pdfToImage2(byte[] fileContent) throws IOException {
        byte[] result = null;
        try (PDDocument document = PDDocument.load(fileContent)) {
            PDFRenderer renderer = new PDFRenderer(document);
            BufferedImage bufferedImage = renderer.renderImageWithDPI(0, DPI);
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            ImageIO.write(bufferedImage, IMG_TYPE, out);
            result = out.toByteArray();
        }
        return result;
    }

    /**
     * @param imageBytes: 二进制数据
     * @param savePath:   保存的路径
     * @param imageName:  报告名称
     * @描述:
     **/
    public static Boolean saveImage(byte[] imageBytes, String savePath, String imageName) throws IOException {
        try {
            BufferedImage image = ImageIO.read(new ByteArrayInputStream(imageBytes));
            File directory = new File(savePath);
            if (!directory.exists()) {
                directory.mkdirs();
            }
            File outputFile = new File(directory, imageName);
            return ImageIO.write(image, "jpg", outputFile);
        } catch (Exception e) {
            log.error("保存图片报错", e);
            return false;
        }
    }

    public static String createDateDir(String basePath) throws Exception {

        String dayStr = DateUtil.format(DateUtil.date(Calendar.getInstance()), "yyyy-MM-dd");
        String[] dayArr = dayStr.split("-");

        String year = dayArr[0];
        String month = dayArr[1];
        String day = dayArr[2];

        String yearDir = basePath + File.separator + year;

        File yearFile = new File(yearDir);
        if (!yearFile.exists()) {
            yearFile.mkdirs();
        }

        String monthDir = yearDir + File.separator + month;
        File monthFile = new File(monthDir);
        if (!monthFile.exists()) {
            monthFile.mkdirs();
        }

        String dayDir = monthDir + File.separator + day;
        File dayFile = new File(dayDir);
        if (!dayFile.exists()) {
            dayFile.mkdirs();
        }
        //2020\10\15\
        return year + File.separator + month + File.separator + day + File.separator;
    }
    
}

测试代码

public static void main(String[] args) throws IOException {

    byte[] pdfBytes = HttpUtil.downloadBytes("http://127.0.0.1:8080/static/123.pdf");
    byte[] imgBytes = PdfToImageUtil.pdfToImage2(pdfBytes);

    String savePath = "D:\\jfapp\\pdf";
    String imageName = "12121313.jpg";

    try {
        //saveImage(imgBytes, savePath, imageName);
        String path = createDateDir(savePath.concat("/pdf"));
        PdfToImageUtil.saveImage(imgBytes, savePath.concat("\\pdf\\").concat(path), "123.jpg");
    } catch (Exception e) {
        e.printStackTrace();
    }
}