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("{}-正在生成圖片", 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("{}-正在整合圖片", fileName);
			File dir = file.getParentFile();
			File pic = new File(dir, name+".png");
			MergeImageUtil.mergeImage(images, pic);

			log.info("{}-正在上傳圖片", fileName);
			fis = new FileInputStream(pic);
			BladeFile bladeFile = ossBuilder.template(teOssProperties.getPic()).putFile(pic.getName(), fis);

			log.info("{}-正在保存圖片地址", 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();
//		}
	}

}

然后用的時候：文章來源地址http://www.zghlxwxcb.cn/news/detail-511605.html

	/**
	 *  替換圖紙文件
	 */
	@PostMapping("/replace")
	@ApiOperationSupport(order = 13)
	@ApiOperation(value = "替換圖紙", notes = "圖紙文件")
	public R replaceFile(MultipartFile file, Long id) {
		String fileName = file.getOriginalFilename();

		DrawingInfo drawing = drawingInfoService.getById(id);
		if(drawing == null){
			log.error("圖紙數(shù)據(jù)不存在,id={}", id);
			return R.fail(StatusEnum.DRAWING_FILE_NOT_EXIST.getCode());
		}

		Long projectId = drawing.getProjectId();
		//驗證是否已存在該圖紙
		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 + "圖紙已存在");
			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("上傳文件異常,"+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("上傳圖紙文件異常,異常信息:{}", 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,
			"替換: 圖紙id="+id+",新圖紙文件="+fileName );

		return R.success(StatusEnum.REPLACE_DRAWING_FILE_SUCCESS.getCode());
	}




}

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