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。