package readPPTX;

import com.spire.presentation.ISlide;
import com.spire.presentation.Presentation;
import org.apache.poi.hslf.HSLFSlideShow;
import org.apache.poi.hslf.model.Slide;
import org.apache.poi.hslf.model.TextRun;
import org.apache.poi.hslf.usermodel.RichTextRun;
import org.apache.poi.hslf.usermodel.SlideShow;

import java.awt.*;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Scanner;

/**
 * 需求：将ppt文件中的每张幻灯片都输出成图片。图片的名字为每张幻灯片里的备注
 * 1.使用poi和Free Spire.Presentation for Java
 *      poi实现每张幻灯片的读取
 *      Free Spire.Presentation for Java实现每张幻灯片的备注名字读取
 * 2.注意这里的ppt文件为97版到03版的
 */
public class Read09 {
    public static void main(String[] args) throws Exception {
        // 要处理的ppt路劲
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要处理的文件:");
        String filePath = scanner.nextLine();
        // 封装输入的路径为File对象
        File dir = new File(filePath);
        if (!dir.exists()) {
            System.out.println("你输入的文件不存在!请检查是否输入正确！！！");
            return;
        }else if (dir.exists() && dir.isDirectory()) {
            System.out.println("你输入的是文件夹而不是文件路径！！！");
            return;
        }
        System.out.println("请输入要保存的路径:");
        String downloadPath = scanner.nextLine();
        File dirPath = new File(downloadPath);
        if (!dirPath.exists() && !dirPath.isDirectory()) {
            dirPath.mkdirs();
        }
        FileInputStream fileInputStream = new FileInputStream(filePath);
        // 获取到这个ppt对象 PS:pptx文件使用XMLSlideShow
        SlideShow slideShow = new SlideShow(new HSLFSlideShow(fileInputStream));
        // 关闭文件读取流
        fileInputStream.close();
        // 这个是Free Spire.Presentation for Java的方法
        Presentation ppt = new Presentation();
        // 加载ppt文档
        ppt.loadFromFile(filePath);
        // 获取大小
        Dimension dimension = slideShow.getPageSize();
        // 获取幻灯片
        Slide[] slides = slideShow.getSlides();
        // 遍历幻灯片
        String notes = "";
        for (int i = 0; i < slides.length; i++) {
            ISlide iSlide = ppt.getSlides().get(i);
            // 获取幻灯片中的备注内容
            if (iSlide.getNotesSlide() == null) {
                System.out.println("第" + (i + 1) + "张幻灯片备注存在问题！请检查");
            }else {
                notes = iSlide.getNotesSlide().getNotesTextFrame().getText();
            }
//            String notes = iSlide.getNotesSlide().getNotesTextFrame().getText();
            // 解决乱码问题
            TextRun[] textRuns = slides[i].getTextRuns();
            for (int k = 0; k < textRuns.length; k++) {
                RichTextRun[] richTextRuns = textRuns[k].getRichTextRuns();
                for (int j = 0; j < richTextRuns.length; j++) {
                    richTextRuns[j].setFontIndex(1);
                    richTextRuns[j].setFontName("宋体");
                }
            }

            // 根据幻灯片大小生成图片
            BufferedImage img = new BufferedImage(dimension.width, dimension.height, BufferedImage.TYPE_INT_RGB);
            Graphics2D graphics = img.createGraphics();
            graphics.setPaint(Color.white);
            graphics.fill(new Rectangle2D.Float(0, 0, dimension.width, dimension.height));
            // 核心实现代码
            slides[i].draw(graphics);

            // 设定图片保存的位置
            String url = downloadPath + notes + ".png";
//            System.out.println(url);
            FileOutputStream outputStream = new FileOutputStream(url);
            javax.imageio.ImageIO.write(img, "png", outputStream);
            outputStream.close();
        }
    }
}

PS：希望有人能补充一些知识点