解析Java的InputStream类并借助其读取ppt文件

 int count = in.available();
 byte[] b = new byte[count];
 in.read(b);

 int count = 0;
 while (count == 0) {
  count = in.available();
 }
 byte[] b = new byte[count];
 in.read(b);

 byte[] b = new byte[count];
 int readCount = 0; // 已经成功读取的字节的个数
 while (readCount < count) {
  readCount += in.read(bytes, readCount, count - readCount);
 }

import java.io.InputStream; 
 
import org.apache.lucene.document.Document; 
import org.apache.poi.hslf.HSLFSlideShow; 
import org.apache.poi.hslf.model.TextRun; 
import org.apache.poi.hslf.model.Slide; 
import org.apache.poi.hslf.usermodel.SlideShow; 
 
public Document getDocument(Index index, String url, String title, InputStream is) 
throws DocCenterException { 
 StringBuffer content = new StringBuffer(""); 
 try{ 
  SlideShow ss = new SlideShow(new HSLFSlideShow(is));//is 为文件的InputStream，建立SlideShow 
  Slide[] slides = ss.getSlides();//获得每一张幻灯片 
  for(int i=0;i<slides.length;i++){ 
  TextRun[] t = slides[i].getTextRuns();//为了取得幻灯片的文字内容，建立TextRun 
  for(int j=0;j<t.length;j++){ 
   content.append(t[j].getText());//这里会将文字内容加到content中去 
  } 
  content.append(slides[i].getTitle()); 
  } 
  index.AddIndex(url, title, content.toString()); 
 }catch(Exception ex){ 
  System.out.println(ex.toString()); 
 } 
 return null; 
}