JAVA-WEB（通过POI）实现PPT在线预览

思路：

获取网络PPT 文件 将PPT每一页的幻灯片都转换成单张图片 用流输出到页面展示

1, 首先获取PPT格式 PPT格式无非两种 PPTX,PPT

2,获取PPT幻灯片页数传递到JSP中

3,JSP循环获取每页PPT

代码：
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.List;

import javax.imageio.ImageIO;

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 org.apache.poi.xslf.usermodel.XMLSlideShow;
import org.apache.poi.xslf.usermodel.XSLFShape;
import org.apache.poi.xslf.usermodel.XSLFSlide;
import org.apache.poi.xslf.usermodel.XSLFTextParagraph;
import org.apache.poi.xslf.usermodel.XSLFTextRun;
import org.apache.poi.xslf.usermodel.XSLFTextShape;
import org.openxmlformats.schemas.drawingml.x2006.main.CTRegularTextRun;
import org.openxmlformats.schemas.drawingml.x2006.main.CTTextBody;
import org.openxmlformats.schemas.drawingml.x2006.main.CTTextCharacterProperties;
import org.openxmlformats.schemas.drawingml.x2006.main.CTTextFont;
import org.openxmlformats.schemas.drawingml.x2006.main.CTTextParagraph;
import org.openxmlformats.schemas.presentationml.x2006.main.CTGroupShape;
import org.openxmlformats.schemas.presentationml.x2006.main.CTShape;
import org.openxmlformats.schemas.presentationml.x2006.main.CTSlide;

import com.yyt.yunbao.common.vo.PptImageResult;

/**

• @author Xu Yuanyuan

• @version 1.0

• @date 2017年4月25日 上午11:11:07

• @desc PPT转换为图片
  */
  public class PPTToImageUtil {

  public static void main(String[] args) {
  String url = "http://www.xxx.com/xxx.pptx";//支持ppt和pptx
  try {
  ByteArrayInputStream pptInput = Utility.readNetFile(url);
  PptImageResult result = PPTToImageUtil.convert(".pptx", pptInput);
  System.out.println(result.getTotalImage());
  System.out.println(result.getImageByteList().size());
  } catch (Exception e) {
  e.printStackTrace();
  }
  }

  public static PptImageResult convert(String suffix, ByteArrayInputStream pptInput) {
  if (pptInput != null) {
  if (suffix.endsWith(".pptx")) {
  return PPTToImageUtil.ppt2007Img(pptInput);
  } else if (suffix.endsWith(".ppt")) {
  return PPTToImageUtil.ppt2003Img(pptInput);
  }
  }
  return null;
  }

  /**

  • 设置PPTX字体

  • @param slide
    */
    private static void setFont(XSLFSlide slide) {
    for (XSLFShape shape : slide.getShapes()) {
    if (shape instanceof XSLFTextShape) {
    XSLFTextShape txtshape = (XSLFTextShape) shape;
    for (XSLFTextParagraph paragraph : txtshape.getTextParagraphs()) {
    List truns = paragraph.getTextRuns();
    for (XSLFTextRun trun : truns) {
    trun.setFontFamily("宋体");
    double currentFontSize = trun.getFontSize();
    if((currentFontSize <=0)||(currentFontSize >=26040)){
    trun.setFontSize(30);
    }
    }
    }
    }

    }
    }

  /**

  • 转换为2007版的PPT到图片流
  • @param bais
  • @return
    */
    public static PptImageResult ppt2007Img(ByteArrayInputStream bais) {
    PptImageResult result = new PptImageResult();
    XMLSlideShow ppt = null;
    try {
    ppt = new XMLSlideShow(bais);
    Dimension pgsize = ppt.getPageSize();
    XSLFSlide[] slides = ppt.getSlides();
    result.setTotalImage(slides.length);
    for (int i = 0; i < slides.length; i++) {
    // 设置字体为宋体，解决中文乱码问题
    CTSlide xmlObject = slides[i].getXmlObject();
    setFont(slides[i]);
    CTGroupShape spTree = xmlObject.getCSld().getSpTree();
    CTShape[] spArray = spTree.getSpArray();
    for (CTShape shape : spArray) {
    CTTextBody txBody = shape.getTxBody();
    if (txBody == null) {
    continue;
    }
    CTTextParagraph[] pArray = txBody.getPArray();
    CTTextFont font = CTTextFont.Factory
    .parse(""
    + " "
    + " " + "" + "");
    for (CTTextParagraph textParagraph : pArray) {
    CTRegularTextRun[] textRuns = textParagraph.getRArray();
    for (CTRegularTextRun textRun : textRuns) {
    CTTextCharacterProperties properties = textRun.getRPr();
    properties.setLatin(font);
    }
    }
    }
    BufferedImage img = new BufferedImage(pgsize.width, pgsize.height, BufferedImage.TYPE_INT_RGB);
    Graphics2D graphics = img.createGraphics();
    graphics.setPaint(Color.white);
    graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));
    slides[i].draw(graphics);
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    ImageIO.write(img, "png", baos);
    baos.flush();
    baos.close();
    result.getImageByteList().add(baos.toByteArray());
    }
    } catch (Exception e) {
    e.printStackTrace();
    } finally {
    if (bais != null) {
    try {
    bais.close();
    } catch (IOException e) {
    e.printStackTrace();
    }
    }
    }
    return result;
    }

  /**

  • 设置字体防止乱码
  • @param slide
    */
    private static void set2003Font(Slide slide) {
    TextRun[] truns = slide.getTextRuns();
    if(Utility.isNotEmpty(truns)){
    for (TextRun trun: truns) {
    RichTextRun[] rtruns = trun.getRichTextRuns();
    if(Utility.isNotEmpty(rtruns)){
    for (RichTextRun rtrun : rtruns) {
    rtrun.setFontIndex(1);
    rtrun.setFontName("宋体");
    }
    }
    }
    }
    }

  /**

  • 转换为2003版的PPT到图片流
  • @param bais
  • @return
    */
    public static PptImageResult ppt2003Img(ByteArrayInputStream bais) {
    PptImageResult result = new PptImageResult();
    try {
    SlideShow ppt = new SlideShow(new HSLFSlideShow(bais));
    Dimension pgsize = ppt.getPageSize();
    Slide[] slides = ppt.getSlides();
    result.setTotalImage(slides.length);
    for (int i = 0; i < slides.length; i++) {
    set2003Font(slides[i]);
    BufferedImage img = new BufferedImage(pgsize.width, pgsize.height, BufferedImage.TYPE_INT_RGB);
    Graphics2D graphics = img.createGraphics();
    graphics.setPaint(Color.white);
    graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));
    slides[i].draw(graphics);
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    ImageIO.write(img, "png", baos);
    baos.flush();
    baos.close();
    result.getImageByteList().add(baos.toByteArray());
    }
    } catch (Exception e) {
    e.printStackTrace();
    } finally {
    if (bais != null) {
    try {
    bais.close();
    } catch (IOException e) {
    e.printStackTrace();
    }
    }
    }
    return result;
    }
    }