Java實現在線預覽的示例代碼(openOffice實現)

簡介

之前有寫了poi實現在線預覽的文章，裡面也說到了使用openOffice也可以做到，這裡就詳細介紹一下。

我的實現邏輯有兩種：

一、利用jodconverter(基於OpenOffice服務)將文件(.doc、.docx、.xls、.ppt)轉化為html格式。

二、利用jodconverter(基於OpenOffice服務)將文件(.doc、.docx、.xls、.ppt)轉化為pdf格式。

轉換成html格式大家都能理解，這樣就可以直接在瀏覽器上查看了，也就實現了在線預覽的功能；轉換成pdf格式這點，需要用戶安裝了Adobe Reader XI，這樣你會發現把pdf直接拖到瀏覽器頁面可以直接打開預覽，這樣也就實現了在線預覽的功能。

將文件轉化為html格式或者pdf格式

話不多說，直接上代碼。

 package com.pdfPreview.util;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.ConnectException;import java.text.SimpleDateFormat;import java.util.Date;import com.artofsolving.jodconverter.DocumentConverter;import com.artofsolving.jodconverter.openoffice.connection.OpenOfficeConnection;import com.artofsolving.jodconverter.openoffice.connection.SocketOpenOfficeConnection;import com.artofsolving.jodconverter.openoffice.converter.OpenOfficeDocumentConverter;/** * 利用jodconverter(基於OpenOffice服務)將文件(*.doc、*.docx、*.xls、*.ppt)轉化為html格式或者pdf格式， * 使用前請檢查OpenOffice服務是否已經開啟, OpenOffice進程名稱：soffice.exe | soffice.bin * * @author yjclsx */public class Doc2HtmlUtil { private static Doc2HtmlUtil doc2HtmlUtil; /** * 獲取Doc2HtmlUtil實例*/ public static synchronized Doc2HtmlUtil getDoc2HtmlUtilInstance() { if (doc2HtmlUtil == null) { doc2HtmlUtil = new Doc2HtmlUtil(); } return doc2HtmlUtil; } /** * 轉換文件成html * * @param fromFileInputStream: * @throws IOException */ public String file2Html(InputStream fromFileInputStream, String toFilePath,String type) throws IOException { Date date = new Date(); SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss"); String timesuffix = sdf.format(date); String docFileName = null; String htmFileName = null; if("doc".equals(type)){ docFileName = "doc_" + timesuffix + ".doc"; htmFileName = "doc_" + timesuffix + ".html"; }else if("docx".equals(type)){ docFileName = "docx_" + timesuffix + ".docx"; htmFileName = "docx_" + timesuffix + ".html"; }else if("xls".equals(type)){ docFileName = "xls_" + timesuffix + ".xls"; htmFileName = "xls_" + timesuffix + ".html"; }else if("ppt".equals(type)){ docFileName = "ppt_" + timesuffix + ".ppt"; htmFileName = "ppt_" + timesuffix + ".html"; }else{ return null; } File htmlOutputFile = new File(toFilePath + File.separatorChar + htmFileName); File docInputFile = new File(toFilePath + File.separatorChar + docFileName); if (htmlOutputFile.exists()) htmlOutputFile.delete(); htmlOutputFile.createNewFile(); if (docInputFile.exists()) docInputFile.delete(); docInputFile.createNewFile(); /** * 由fromFileInputStream構建輸入文件*/ try { OutputStream os = new FileOutputStream(docInputFile); int bytesRead = 0; byte[] buffer = new byte[1024 * 8]; while ((bytesRead = fromFileInputStream.read(buffer)) != -1) { os.write(buffer, 0, bytesRead); } os.close(); fromFileInputStream.close(); } catch (IOException e) { } OpenOfficeConnection connection = new SocketOpenOfficeConnection(8100); try { connection.connect(); } catch (ConnectException e) { System.err.println("文件轉換出錯，請檢查OpenOffice服務是否啟動。"); } // convert DocumentConverter converter = new OpenOfficeDocumentConverter(connection); converter.convert(docInputFile, htmlOutputFile); connection.disconnect(); // 轉換完之後刪除word文件docInputFile.delete(); return htmFileName; } /** * 轉換文件成pdf * * @param fromFileInputStream: * @throws IOException */ public String file2pdf(InputStream fromFileInputStream, String toFilePath,String type) throws IOException { Date date = new Date(); SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss"); String timesuffix = sdf.format(date); String docFileName = null; String htmFileName = null; if("doc".equals(type)){ docFileName = "doc_" + timesuffix + ".doc"; htmFileName = "doc_" + timesuffix + ".pdf"; }else if("docx".equals(type)){ docFileName = "docx_" + timesuffix + ".docx"; htmFileName = "docx_" + timesuffix + ".pdf"; }else if("xls".equals(type)){ docFileName = "xls_" + timesuffix + ".xls"; htmFileName = "xls_" + timesuffix + ".pdf"; }else if("ppt".equals(type)){ docFileName = "ppt_" + timesuffix + ".ppt"; htmFileName = "ppt_" + timesuffix + ".pdf"; }else{ return null; } File htmlOutputFile = new File(toFilePath + File.separatorChar + htmFileName); File docInputFile = new File(toFilePath + File.separatorChar + docFileName); if (htmlOutputFile.exists()) htmlOutputFile.delete(); htmlOutputFile.createNewFile(); if (docInputFile.exists()) docInputFile.delete(); docInputFile.createNewFile(); /** * 由fromFileInputStream構建輸入文件*/ try { OutputStream os = new FileOutputStream(docInputFile); int bytesRead = 0; byte[] buffer = new byte[1024 * 8]; while ((bytesRead = fromFileInputStream.read(buffer)) != -1) { os.write(buffer, 0, bytesRead); } os.close(); fromFileInputStream.close(); } catch (IOException e) { } OpenOfficeConnection connection = new SocketOpenOfficeConnection(8100); try { connection.connect(); } catch (ConnectException e) { System.err.println("文件轉換出錯，請檢查OpenOffice服務是否啟動。"); } // convert DocumentConverter converter = new OpenOfficeDocumentConverter(connection); converter.convert(docInputFile, htmlOutputFile); connection.disconnect(); // 轉換完之後刪除word文件docInputFile.delete(); return htmFileName; } public static void main(String[] args) throws IOException { Doc2HtmlUtil coc2HtmlUtil = getDoc2HtmlUtilInstance(); File file = null; FileInputStream fileInputStream = null; file = new File("D:/poi-test/exportExcel.xls"); fileInputStream = new FileInputStream(file);// coc2HtmlUtil.file2Html(fileInputStream, "D:/poi-test/openOffice/xls","xls"); coc2HtmlUtil.file2pdf(fileInputStream, "D:/poi-test/openOffice/xls","xls"); file = new File("D:/poi-test/test.doc"); fileInputStream = new FileInputStream(file);// coc2HtmlUtil.file2Html(fileInputStream, "D:/poi-test/openOffice/doc","doc"); coc2HtmlUtil.file2pdf(fileInputStream, "D:/poi-test/openOffice/doc","doc"); file = new File("D:/poi-test/週報模版.ppt"); fileInputStream = new FileInputStream(file);// coc2HtmlUtil.file2Html(fileInputStream, "D:/poi-test/openOffice/ppt","ppt"); coc2HtmlUtil.file2pdf(fileInputStream, "D:/poi-test/openOffice/ppt","ppt"); file = new File("D:/poi-test/test.docx"); fileInputStream = new FileInputStream(file);// coc2HtmlUtil.file2Html(fileInputStream, "D:/poi-test/openOffice/docx","docx"); coc2HtmlUtil.file2pdf(fileInputStream, "D:/poi-test/openOffice/docx","docx"); }}

轉換成html和轉換成pdf的過程幾乎一樣，只是在創建輸出的File時前者命名為XXX.html，後者命名為XXX.pdf，在執行converter.convert(docInputFile, htmlOutputFile);時，jodconverter會自己根據文件類型名轉換成對應的文件。

注意，main方法裡別file2Html和file2pdf都調用，會報錯的，要么轉html，要么轉pdf，只能選一個。還有就是在執行之前，需要啟動openOffice的服務：在openOffice目錄下的命令窗口中執行soffice -headless -accept=”socket,host=127.0.0.1,port=8100;urp;” -nofirststartwizard即可啟動。

以上需要引入jodconverter的jar包。希望對大家的學習有所幫助，也希望大家多多支持武林網。