PDF转图片pdf转换图片，线程池-蒲公英云

package com.xhsoft.thread;
import com.xhsoft.common.props.TeOssProperties;
import com.xhsoft.common.utils.MergeImageUtil;
import com.xhsoft.flange.entity.DrawingInfo;
import com.xhsoft.flange.service.IDrawingInfoService;
import com.xhsoft.modules.resource.builder.oss.OssBuilder;
import lombok.extern.slf4j.Slf4j;
import org.apache.pdfbox.Loader;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.springblade.core.oss.model.BladeFile;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
@Slf4j
public class ConvertDrawingToPicture implements Runnable {
    private DrawingInfo drawing;
    private IDrawingInfoService drawingInfoService;
    private File file;
    private OssBuilder ossBuilder;
    private TeOssProperties teOssProperties;
    public ConvertDrawingToPicture(DrawingInfo drawing, File file, IDrawingInfoService drawingInfoService, OssBuilder ossBuilder, TeOssProperties teOssProperties){
        this.drawing = drawing;
        this.drawingInfoService = drawingInfoService;
        this.file = file;
        this.ossBuilder = ossBuilder;
        this.teOssProperties = teOssProperties;
    }
    @Override
    public void run() {
        String fileName = file.getName();
        String name = fileName.substring(0, fileName.lastIndexOf("."));
        log.info("{}-正在生成图片", fileName);
        FileInputStream fis = null;
        try {
            PDDocument doc = Loader.loadPDF(file);
            PDFRenderer renderer = new PDFRenderer(doc);
            int pageCount = doc.getNumberOfPages();
            List<BufferedImage> images = new ArrayList<>();
            for(int i=0;i<pageCount;i++){
                BufferedImage image = renderer.renderImageWithDPI(i, 296);
//                BufferedImage image = renderer.renderImage(i, 2.5f);
//                ImageIO.write(image, "PNG", new File(name+"-"+i+".png"));
                images.add(image);
            }
            log.info("{}-正在整合图片", fileName);
            File dir = file.getParentFile();
            File pic = new File(dir, name+".png");
            MergeImageUtil.mergeImage(images, pic);
            log.info("{}-正在上传图片", fileName);
            fis = new FileInputStream(pic);
            BladeFile bladeFile = ossBuilder.template(teOssProperties.getPic()).putFile(pic.getName(), fis);
            log.info("{}-正在保存图片地址", fileName);
            String picUrl = bladeFile.getLink();
            drawing.setPic(picUrl);
            drawingInfoService.updateById(drawing);
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            if(fis != null) try{ fis.close(); }catch(Exception e){};
        }
    }
    public static void main(String[] args){
//        try {
//            PDDocument doc = Loader.loadPDF(new File("files/drawing/HTP-ER-46-01-02-LO-01_ISO DRGS.pdf"));
//            PDFRenderer renderer = new PDFRenderer(doc);
//            int pageCount = doc.getNumberOfPages();
//            for(int i=0;i<pageCount;i++){
//                BufferedImage image = renderer.renderImageWithDPI(i, 296);
                BufferedImage image = renderer.renderImage(i, 2.5f);
//                ImageIO.write(image, "PNG", new File("files/pricture/"+i+".png"));
//            }
//        } catch (IOException e) {
//            e.printStackTrace();
//        }
    }
}

然后用的时候：

/**
     *  替换图纸文件
     */
    @PostMapping("/replace")
    @ApiOperationSupport(order = 13)
    @ApiOperation(value = "替换图纸", notes = "图纸文件")
    public R replaceFile(MultipartFile file, Long id) {
        String fileName = file.getOriginalFilename();
        DrawingInfo drawing = drawingInfoService.getById(id);
        if(drawing == null){
            log.error("图纸数据不存在,id={}", id);
            return R.fail(StatusEnum.DRAWING_FILE_NOT_EXIST.getCode());
        }
        Long projectId = drawing.getProjectId();
        //验证是否已存在该图纸
        DrawingInfoTO condition = new DrawingInfoTO();
        condition.setProjectId(projectId);
        condition.setName(fileName);
        condition.setIsDeleted(0);
        List<DrawingInfo> drawings = drawingInfoService.list(Condition.getQueryWrapper(condition));
        if (drawings.size() > 0) {
            log.error(fileName + "图纸已存在");
            return R.fail(fileName + StatusEnum.DRAWING_EXIST.getCode());
        }
        String fileUrl = null;
        String date = CommonUtil.SDF_DATE.format(new Date());
        Path dest = Paths.get(pathProperties.getDrawing(),  date, fileName);
        //保存文件在本地
        try {
            if(!dest.toFile().exists()){
                Files.createDirectories(dest);
            }
            Files.copy(file.getInputStream(), dest, StandardCopyOption.REPLACE_EXISTING);
        } catch (IOException e) {
            log.error("上传文件异常,"+e.getMessage());
            return R.fail(fileName + ":"+StatusEnum.SAVE_FILE_EXCEPTION.getCode());
        }
        File pdfFile = dest.toFile();
        FileInputStream fis = null;
        try{
            fis = new FileInputStream(pdfFile);
        }catch(Exception e){
            e.printStackTrace();
        }
        try{
            BladeFile bladeFile = ossBuilder.template(teOssProperties.getPdf()).putFile(fileName, fis);
            fileUrl = bladeFile.getLink();
        }catch(Exception e){
            log.error("上传图纸文件异常,异常信息:{}", e.getMessage());
            e.printStackTrace();
            return R.fail(StatusEnum.UPLOAD_DRAWING_FILE_EXCEPTION.getCode());
        }
        DrawingInfoTO di = new DrawingInfoTO();
        di.setId(drawing.getId());
//        di.setCode(fileName);
//        di.setName(fileName);
        di.setUrl(fileUrl);
        di.setPdfFile(pdfFile);
        drawingInfoService.updateById(di);
        String url = drawing.getUrl();
        if(StringUtil.isNotBlank(url)){
            String pdfName = url.substring(url.lastIndexOf('/')+1);
            ossBuilder.template(teOssProperties.getPdf()).removeFile(pdfName);
        }
        String pic = drawing.getPic();
        if(StringUtil.isNotBlank(pic)){
            String picNme = pic.substring(pic.lastIndexOf('/')+1);
            ossBuilder.template(teOssProperties.getPic()).removeFile(picNme);
        }
        ExecutorService fixedPool = Executors.newFixedThreadPool(1);
        ConvertDrawingToPicture convert = new ConvertDrawingToPicture(
            di,
            di.getPdfFile(),
            drawingInfoService,
            ossBuilder,
            teOssProperties
        );
        fixedPool.execute(convert);
        fixedPool.shutdown();
        logTool.insert(drawing.getProjectId(), SysEnum.FLANGE, ModuleEnum.DRAWING,
            "替换: 图纸id="+id+",新图纸文件="+fileName );
        return R.success(StatusEnum.REPLACE_DRAWING_FILE_SUCCESS.getCode());
    }
}