java实现在线预览--poi实现word、excel、ppt转html的方法

java实现在线预览

- -之poi实现word、excel、ppt转html，具体内容如下所示：

###简介

java实现在线预览功能是一个大家在工作中也许会遇到的需求，如果公司有钱，直接使用付费的第三方软件或者云在线预览服务就可以了，例如永中office、office web 365(http://www.officeweb365.com/)他们都有云在线预览服务，就是要钱0.0

如果想要免费的，可以用openoffice，还需要借助其他的工具(例如swfTools、FlexPaper等)才行，可参考这篇文章http://blog.csdn.net/z69183787/article/details/17468039，写的挺细的，实现原理就是：

1.通过第三方工具openoffice，将word、excel、ppt、txt等文件转换为pdf文件；

2.通过swfTools将pdf文件转换成swf格式的文件；

3.通过FlexPaper文档组件在页面上进行展示。

当然如果装了Adobe Reader XI，那把pdf直接拖到浏览器页面就可以直接打开预览，这样就不需要步骤2、3了，前提就是客户装了Adobe Reader XI这个pdf阅读器。

我这里介绍通过poi实现word、excel、ppt转html，这样就可以放在页面上了。

###word转html

package wordToHtml;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.List;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.apache.commons.io.FileUtils;
import org.apache.poi.hwpf.HWPFDocument;
import org.apache.poi.hwpf.converter.PicturesManager;
import org.apache.poi.hwpf.converter.WordToHtmlConverter;
import org.apache.poi.hwpf.usermodel.Picture;
import org.apache.poi.hwpf.usermodel.PictureType;
import org.w3c.dom.Document;
public class PoiWordToHtml {
 public static void main(String[] args) throws Throwable {
 final String path = "D:\\poi-test\\wordToHtml\\";
 final String file = "人员选择系分.doc";
 InputStream input = new FileInputStream(path + file);
 HWPFDocument wordDocument = new HWPFDocument(input);
 WordToHtmlConverter wordToHtmlConverter = new WordToHtmlConverter(
  DocumentBuilderFactory.newInstance().newDocumentBuilder()
   .newDocument());
 wordToHtmlConverter.setPicturesManager(new PicturesManager() {
  public String savePicture(byte[] content, PictureType pictureType,
   String suggestedName, float widthInches, float heightInches) {
  return suggestedName;
  }
 });
 wordToHtmlConverter.processDocument(wordDocument);
 List pics = wordDocument.getPicturesTable().getAllPictures();
 if (pics != null) {
  for (int i = 0; i < pics.size(); i++) {
  Picture pic = (Picture) pics.get(i);
  try {
   pic.writeImageContent(new FileOutputStream(path
    + pic.suggestFullFileName()));
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  }
  }
 }
 Document htmlDocument = wordToHtmlConverter.getDocument();
 ByteArrayOutputStream outStream = new ByteArrayOutputStream();
 DOMSource domSource = new DOMSource(htmlDocument);
 StreamResult streamResult = new StreamResult(outStream);
 TransformerFactory tf = TransformerFactory.newInstance();
 Transformer serializer = tf.newTransformer();
 serializer.setOutputProperty(OutputKeys.ENCODING, "utf-8");
 serializer.setOutputProperty(OutputKeys.INDENT, "yes");
 serializer.setOutputProperty(OutputKeys.METHOD, "html");
 serializer.transform(domSource, streamResult);
 outStream.close();
 String content = new String(outStream.toByteArray());
 FileUtils.writeStringToFile(new File(path, "人员选择系分.html"), content, "utf-8");
 }
}

###excel转html

package excelToHtml;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.apache.commons.io.FileUtils;
import org.apache.poi.hssf.converter.ExcelToHtmlConverter;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hwpf.converter.PicturesManager;
import org.apache.poi.hwpf.converter.WordToHtmlConverter;
import org.apache.poi.hwpf.usermodel.Picture;
import org.apache.poi.hwpf.usermodel.PictureType;
import org.w3c.dom.Document;

public class PoiExcelToHtml {
 final static String path = "D:\\poi-test\\excelToHtml\\";
 final static String file = "exportExcel.xls";
 public static void main(String args[]) throws Exception {

 InputStream input=new FileInputStream(path+file);
 HSSFWorkbook excelBook=new HSSFWorkbook(input);
 ExcelToHtmlConverter excelToHtmlConverter = new ExcelToHtmlConverter (DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument() );
 excelToHtmlConverter.processWorkbook(excelBook);
 List pics = excelBook.getAllPictures();
   if (pics != null) {
     for (int i = 0; i < pics.size(); i++) {
       Picture pic = (Picture) pics.get (i);
       try {
         pic.writeImageContent (new FileOutputStream (path + pic.suggestFullFileName() ) );
       } catch (FileNotFoundException e) {
         e.printStackTrace();
       }
     }
   }
   Document htmlDocument =excelToHtmlConverter.getDocument();
   ByteArrayOutputStream outStream = new ByteArrayOutputStream();
   DOMSource domSource = new DOMSource (htmlDocument);
   StreamResult streamResult = new StreamResult (outStream);
   TransformerFactory tf = TransformerFactory.newInstance();
   Transformer serializer = tf.newTransformer();
   serializer.setOutputProperty (OutputKeys.ENCODING, "utf-8");
   serializer.setOutputProperty (OutputKeys.INDENT, "yes");
   serializer.setOutputProperty (OutputKeys.METHOD, "html");
   serializer.transform (domSource, streamResult);
   outStream.close();
   String content = new String (outStream.toByteArray() );
   FileUtils.writeStringToFile(new File (path, "exportExcel.html"), content, "utf-8");
 }
}

###ppt转html

其实只是ppt转图片，有了图片后放到页面上去，点击下一页就一张张显示就可以了。这里只介绍ppt转图片的过程。

package pptToImg;
import java.awt.Dimension;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import org.apache.poi.hslf.model.TextRun;
import org.apache.poi.hslf.record.Slide;
import org.apache.poi.hslf.usermodel.RichTextRun;
import org.apache.poi.hslf.usermodel.SlideShow;
public class PPTtoImage {
  public static void main(String[] args) {
    // 读入PPT文件
    File file = new File("D:/poi-test/pptToImg/test.ppt");
    doPPTtoImage(file);
  }
  public static boolean doPPTtoImage(File file) {
    boolean isppt = checkFile(file);
    if (!isppt) {
      System.out.println("The image you specify don't exit!");
      return false;
    }
    try {
      FileInputStream is = new FileInputStream(file);
      SlideShow ppt = new SlideShow(is);
      is.close();
      Dimension pgsize = ppt.getPageSize();
      org.apache.poi.hslf.model.Slide[] slide = ppt.getSlides();
      for (int i = 0; i < slide.length; i++) {
        System.out.print("第" + i + "页。");
        TextRun[] truns = slide[i].getTextRuns();
        for ( int k=0;k<truns.length;k++){
          RichTextRun[] rtruns = truns[k].getRichTextRuns();
         for(int l=0;l<rtruns.length;l++){
            int index = rtruns[l].getFontIndex();
            String name = rtruns[l].getFontName();
            rtruns[l].setFontIndex(1);
            rtruns[l].setFontName("宋体");
//            System.out.println(rtruns[l].getText());
          }
        }
        BufferedImage img = new BufferedImage(pgsize.width,pgsize.height, BufferedImage.TYPE_INT_RGB);
        Graphics2D graphics = img.createGraphics();
        graphics.setPaint(Color.BLUE);
        graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));
        slide[i].draw(graphics);
        // 这里设置图片的存放路径和图片的格式(jpeg,png,bmp等等),注意生成文件路径
        FileOutputStream out = new FileOutputStream("D:/poi-test/pptToImg/pict_"+ (i + 1) + ".jpeg");
        javax.imageio.ImageIO.write(img, "jpeg", out);
        out.close();
      }
      System.out.println("success!!");
      return true;
    } catch (FileNotFoundException e) {
      System.out.println(e);
      // System.out.println("Can't find the image!");
    } catch (IOException e) {
    }
    return false;
  }
  // function 检查文件是否为PPT
  public static boolean checkFile(File file) {
    boolean isppt = false;
    String filename = file.getName();
    String suffixname = null;
    if (filename != null && filename.indexOf(".") != -1) {
      suffixname = filename.substring(filename.indexOf("."));
      if (suffixname.equals(".ppt")) {
        isppt = true;
      }
      return isppt;
    } else {
      return isppt;
    }
  }
} 

ppt转图片有个缺陷，就是ppt里不是宋体的字有些可能会变成框框。

以上都需要引入poi的jar包。

要实现在线预览，只需把转换得到的html在新标签页打开或者镶嵌到某块区域就可以展现了。

总结

以上所述是小编给大家介绍的java实现在线预览--poi实现word、excel、ppt转html的方法,希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对我们网站的支持！
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