#Java实现在线预览–openOffice实现
##简介
之前有写了poi实现在线预览的文章，里面也说到了使用openOffice也可以做到，这里就详细介绍一下。
我的实现逻辑有两种：
一、利用jodconverter(基于OpenOffice服务)将文件(.doc、.docx、.xls、.ppt)转化为html格式。
二、利用jodconverter(基于OpenOffice服务)将文件(.doc、.docx、.xls、.ppt)转化为pdf格式。
转换成html格式大家都能理解，这样就可以直接在浏览器上查看了，也就实现了在线预览的功能；转换成pdf格式这点，需要用户安装了Adobe Reader XI，这样你会发现把pdf直接拖到浏览器页面可以直接打开预览，这样也就实现了在线预览的功能。
##将文件转化为html格式或者pdf格式
话不多说，直接上代码。

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(基于OpenOffice服务)将文件(*.doc、*.docx、*.xls、*.ppt)转化为html格式或者pdf格式，* 使用前请检查OpenOffice服务是否已经开启, OpenOffice进程名称：soffice.exe | soffice.bin* * @author yjclsx*/
public class Doc2HtmlUtil {private static Doc2HtmlUtil doc2HtmlUtil;/*** 获取Doc2HtmlUtil实例*/public static synchronized Doc2HtmlUtil getDoc2HtmlUtilInstance() {if (doc2HtmlUtil == null) {doc2HtmlUtil = new Doc2HtmlUtil();}return doc2HtmlUtil;}/*** 转换文件成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构建输入文件*/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("文件转换出错，请检查OpenOffice服务是否启动。");}// convertDocumentConverter converter = new OpenOfficeDocumentConverter(connection);converter.convert(docInputFile, htmlOutputFile);connection.disconnect();// 转换完之后删除word文件docInputFile.delete();return htmFileName;}/*** 转换文件成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构建输入文件*/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("文件转换出错，请检查OpenOffice服务是否启动。");}// convertDocumentConverter converter = new OpenOfficeDocumentConverter(connection);converter.convert(docInputFile, htmlOutputFile);connection.disconnect();// 转换完之后删除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/周报模版.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");}}

转换成html和转换成pdf的过程几乎一样，只是在创建输出的File时前者命名为XXX.html，后者命名为XXX.pdf，在执行converter.convert(docInputFile, htmlOutputFile);时，jodconverter会自己根据文件类型名转换成对应的文件。
注意，main方法里别file2Html和file2pdf都调用，会报错的，要么转html，要么转pdf，只能选一个。还有就是在执行之前，需要启动openOffice的服务：在openOffice目录下的命令窗口中执行soffice -headless -accept=“socket,host=127.0.0.1,port=8100;urp;” -nofirststartwizard即可启动。
以上需要引入jodconverter的jar包。