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;

public class Doc2HtmlUtil {

  private static Doc2HtmlUtil doc2HtmlUtil;

  
  public static synchronized Doc2HtmlUtil getDoc2HtmlUtilInstance() {
    if (doc2HtmlUtil == null) {
      doc2HtmlUtil = new Doc2HtmlUtil();
    }
    return doc2HtmlUtil;
  }

  
  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();
    
    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 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();
    
    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考高分网。