java实现在线预览--poi实现word、excel、ppt转html

叁歲伎倆 2022-07-24 08:14 253阅读 0赞

# java实现在线预览 #

## \- -之poi实现word、excel、ppt转html ##

\#\#\#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/][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。

[http_www.officeweb365.com]: http://www.officeweb365.com/