pdf切割每一页保存成图片

 依赖

<dependency>
        <groupId>org.apache.pdfbox</groupId>
        <artifactId>pdfbox</artifactId>
        <version>2.0.19</version>
      </dependency>
      <dependency>
        <groupId>org.apache.pdfbox</groupId>
        <artifactId>fontbox</artifactId>
        <version>2.0.19</version>
      </dependency>

package com.sensetime.cpic_ocr.service;

import com.sensetime.cpic_ocr.CpicOcrApplication;
import com.sensetime.cpic_ocr.common.entity.pdfconv.ImageObj;
import lombok.extern.slf4j.Slf4j;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

@RunWith(SpringRunner.class)
@SpringBootTest(classes = CpicOcrApplication.class)
public class PdfTest {

    public static void main(String[] args) {
        pdfPageToImage();
    }

    @Test
    public static void pdfPageToImage(){
        PDDocument pdDoc = null;
        Integer numOfPages = 0;
        try {
            PDFRenderer pdRender;
            String pdfImgPath;
            try {
                pdDoc = PDDocument.load(new File("D://pdftest.pdf"));
                numOfPages = pdDoc.getNumberOfPages();
                pdRender = new PDFRenderer(pdDoc);
                for(int i=0;i<numOfPages;i++){
                    convertSingleImage(pdRender,0,i);
                }

            } catch (Exception e1) {
                e1.printStackTrace();
            }
        }catch (Exception e2){
            e2.printStackTrace();
        }
    }

    private static void convertSingleImage(PDFRenderer pdRender, int pgInit, int pgIdx) throws IOException {
        BufferedImage image;

        String imageName=new SimpleDateFormat("yyyyMMdd").format(new Date()).toLowerCase();

        try {
            image = pdRender.renderImage(pgIdx - pgInit, 2f);
            File file=new File("D://pdf" + File.separator + imageName+pgIdx+".JPEG");
            if(!file.getParentFile().exists()){
                file.getParentFile().mkdirs();
            }

            ImageIO.write(image, "JPEG",file);

        } catch (Exception e) {
            throw new IOException();
        }
    }
}