Java：Java的jar包之POI的简介、安装、使用方法(基于POI的转换—Word、Excel、Ppt等转html)之详细攻略
目录
POI的简介
1、基本功能
POI的安装
POI的使用方法(基于POI的转换—Word、Excel、Ppt等转html)
1、基础案例
1.1、创建Excel 文档—利用Jakarta POI API 创建Excel 文档
1.2、读取Excel文档中的数据
1.3、处理WORD文档
2、进阶案例应用
2.1、word转html
2.2、excel转html
2.3、ppt转html
POI的简介
Apache POI是Apache软件基金会的开放源码函式库，POI提供API给Java程序对Microsoft Office格式档案读和写的功能。Poor Obfuscation Implementation即 简洁版的模糊实现。
1、基本功能
HSSF － 提供读写Microsoft Excel格式档案的功能。XSSF － 提供读写MicrosoftExcelOOXML格式档案的功能。HWPF － 提供读写Microsoft Word格式档案的功能。HSLF － 提供读写Microsoft PowerPoint格式档案的功能。HDGF － 提供读写Microsoft Visio格式档案的功能。POI的安装
下载地址：/dyn/closer.lua/poi/release/bin/poi-bin-4.0.0-0907.tar.gz
% gpg --import KEYS% gpg --verify downloaded_file.asc downloaded_fileor% pgpk -a KEYS% pgpv downloaded_file.ascor% pgp -ka KEYS% pgp downloaded_file.asc
POI的使用方法(基于POI的转换—Word、Excel、Ppt等转html)
1、基础案例
1.1、创建Excel 文档—利用Jakarta POI API 创建Excel 文档
import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.apache.poi.hssf.usermodel.HSSFSheet;import org.apache.poi.hssf.usermodel.HSSFRow;import org.apache.poi.hssf.usermodel.HSSFCell;import java.io.FileOutputStream;public class CreateXL {/** Excel 文件要存放的位置，假定在D盘下*/public static String outputFile = "D:\\test.xls";public static void main(String argv[]) {try {// 创建新的Excel 工作簿HSSFWorkbook workbook = new HSSFWorkbook();// 在Excel工作簿中建一工作表，其名为缺省值// 如要新建一名为"效益指标"的工作表，其语句为：// HSSFSheet sheet = workbook.createSheet("效益指标");HSSFSheet sheet = workbook.createSheet();// 在索引0的位置创建行（最顶端的行）HSSFRow row = sheet.createRow((short)0);//在索引0的位置创建单元格（左上端）HSSFCell cell = row.createCell((short)0);// 定义单元格为字符串类型cell.setCellType(HSSFCell.CELL_TYPE_STRING);//已过时// 在单元格中输入一些内容cell.setCellValue("增加值");// 新建一输出文件流FileOutputStream fOut = new FileOutputStream(outputFile);// 把相应的Excel 工作簿存盘workbook.write(fOut);fOut.flush();// 操作结束，关闭文件fOut.close();System.out.println("文件生成...");} catch (Exception e) {System.out.println("已运行 xlCreate() : " + e);}}}
1.2、读取Excel文档中的数据
读取Excel文档中的数据。假定在D盘JTest目录下有一个文件名为test1.xls的Excel文件。
import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.apache.poi.hssf.usermodel.HSSFSheet;import org.apache.poi.hssf.usermodel.HSSFRow;import org.apache.poi.hssf.usermodel.HSSFCell;import java.io.FileInputStream;public class ReadXL {/** Excel文件的存放位置。注意是反斜线*/public static String fileToBeRead = "D:\\test1.xls";public static void main(String argv[]) {try {// 创建对Excel工作簿文件的引用HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(fileToBeRead));// 创建对工作表的引用。// 本例是按名引用（让我们假定那张表有着缺省名"Sheet1"）HSSFSheet sheet = workbook.getSheet("Sheet1");// 也可用getSheetAt(int index)按索引引用，// 在Excel文档中，第一张工作表的缺省索引是0，// 其语句为：HSSFSheet sheet = workbook.getSheetAt(0);// 读取左上端单元HSSFRow row = sheet.getRow(0);HSSFCell cell = row.getCell((short)0);// 输出单元内容，cell.getStringCellValue()就是取所在单元的值System.out.println("左上端单元是： " + cell.getStringCellValue());} catch (Exception e) {System.out.println("已运行xlRead() : " + e);}}}
1.3、处理WORD文档
import java.io. * ;import org.apache.poi.hwpf.extractor.WordExtractor;import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.apache.poi.hssf.usermodel.HSSFSheet;import org.apache.poi.hssf.usermodel.HSSFRow;import org.apache.poi.hssf.usermodel.HSSFCell;public class TestPoi {public TestPoi() {}public static void main(String args[])throws Exception{FileInputStream in = new FileInputStream("D:\\a.doc");WordExtractor extractor = new WordExtractor();String str = extractor.extractText(in);//System.out.println("the result length is"+str.length());System.out.println(str);}}
2、进阶案例应用
文章参考：
/yjclsx/article/details/51441632
/z69183787/article/details/17468039
在现在这个互联网在线时代，java实现在线预览的这个需求，或许是大家都想要的。当然，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，比如永中office、office web 365(/)等公司，都有云端在线预览服务，可想而知，这些扩展功能，肯定是需要钱了。
但是，对于我们学生党，如果想要免费或者DIY，则可以用openoffice，还需要借助其他的工具(例如swfTools、FlexPaper等)才行。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。
当然，本篇文章主要介绍的POI，所以，可以通过POI实现word、excel、ppt转html，这样就可以放在页面上了。
2.1、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");}}
2.2、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");}}
2.3、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。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。
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; } } }
参考文章
百度百科
