string 转 byte_计算机毕业设计中java实现预览poi实现word excel ppt转html

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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(/)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/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 mons.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 mons.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 RichTextRun[] rtruns = truns[k].getRichTextRuns();

for(int l=0;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。

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