Java实现在线预览的示例代码(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。");    }    // convert    DocumentConverter 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。");    }    // convert    DocumentConverter 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。希望对大家的学习有所帮助，也希望大家多多支持武林网。