纯Java显示ppt，一定会给你惊喜的

import java.awt.Dimension;
import java.awt.Graphics2D;
import java.io.FileInputStream;

import javax.swing.JFrame;

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 com.hg.jpd.Jpd;
import com.hg.jpd.JpdFrame;
import com.hg.jpd.JpdViewer;

public class Test {
 /**
  * @param args
  */
 public static void main(String[] args) {
  try {
   SlideShow slideShow = new SlideShow(new FileInputStream("c:/test.ppt"));
   Dimension d = slideShow.getPageSize();
   Jpd jpd = new Jpd((int) d.getWidth(), (int) d.getHeight());
   Slide[] slides = slideShow.getSlides();
   for (int i = 0; i < slides.length; i++) {
    TextRun[] truns = slides[i].getTextRuns();
    for (int k = 0; k < truns.length; k++) {
     RichTextRun[] rtruns = truns[k].getRichTextRuns();
     for (int l = 0; l < rtruns.length; l++) {
      rtruns[l].setFontName("dialog");
     }
    }
    Graphics2D g = jpd.addPage();
    slides[i].draw(g);
    g.dispose();
   }
   jpd.close();
         JpdFrame jpdFrame = new JpdFrame();
         jpdFrame.viewer.setType(JpdViewer.TYPE_SLIDE);
         jpdFrame.setVisible(true);
         jpd.setViewer(jpdFrame.viewer);
         jpdFrame.setBounds(0, 0, 800, 600);
         jpdFrame.setExtendedState(JFrame.MAXIMIZED_BOTH);
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
}

程序库下载
http://www.hgsql.com/down/jpd.jar

http://www.hgsql.com/xdoc/lib/poi.jar

http://www.hgsql.com