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這篇文章將為大家詳細講解有關java如何實現在線預覽之poi實現word、excel、ppt轉html的方法,小編覺得挺實用的,因此分享給大家做個參考,希望大家閱讀完這篇文章后可以有所收獲。
java實現在線預覽
- -之poi實現word、excel、ppt轉html,具體內容如下所示:
###簡介
java實現在線預覽功能是一個大家在工作中也許會遇到的需求,如果公司有錢,直接使用付費的第三方軟件或者云在線預覽服務就可以了,例如永中office、office web 365(http://www.officeweb365.com/)他們都有云在線預覽服務,就是要錢0.0
如果想要免費的,可以用openoffice,還需要借助其他的工具(例如swfTools、FlexPaper等)才行,可參考這篇文章http://blog.csdn.net/z69183787/article/details/17468039,寫的挺細的,實現原理就是:
1.通過第三方工具openoffice,將word、excel、ppt、txt等文件轉換為pdf文件;
2.通過swfTools將pdf文件轉換成swf格式的文件;
3.通過FlexPaper文檔組件在頁面上進行展示。
當然如果裝了Adobe Reader XI,那把pdf直接拖到瀏覽器頁面就可以直接打開預覽,這樣就不需要步驟2、3了,前提就是客戶裝了Adobe Reader XI這個pdf閱讀器。
我這里介紹通過poi實現word、excel、ppt轉html,這樣就可以放在頁面上了。
###word轉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 = "人員選擇系分.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, "人員選擇系分.html"), content, "utf-8"); } }
###excel轉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轉html
其實只是ppt轉圖片,有了圖片后放到頁面上去,點擊下一頁就一張張顯示就可以了。這里只介紹ppt轉圖片的過程。
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) { // 讀入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 + "頁。"); 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("宋體"); // 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); // 這里設置圖片的存放路徑和圖片的格式(jpeg,png,bmp等等),注意生成文件路徑 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 檢查文件是否為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轉圖片有個缺陷,就是ppt里不是宋體的字有些可能會變成框框。
以上都需要引入poi的jar包。
要實現在線預覽,只需把轉換得到的html在新標簽頁打開或者鑲嵌到某塊區域就可以展現了。
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