.NET实现在网页中预览Office文件的3个方法

近日公司要搞一个日常的文档管理的东东,可以上传、下载各种文件,如果是office文件呢还必须得支持预览功能,其他的都好说但是唯独office预览功能比较麻烦,但是不能不做,废话不多说了一步步来吧。分析了下网易邮箱的文件预览功能,他用的是微软的组件,最早叫Office online,现在分开了叫Word online、Excel online ....等等,效果十分炫酷功能十分强大,但是查看了下对api的说明发现对服务器的要求比较苛刻而且配置比较复杂不太适合。然后 又看了下腾讯用的是永中第三方组件,效果嘛自然比不上微软的但是能用,综合网上的一些资料大概也就那么几种方式实现

1.使用Microsoft的Office组件将文件直接转换为html文件(优点:代码实现最简单,工作强度最小。缺点:效果极差)

2.使用Microsoft的Office组件将文件转换为PDF格式文件,然后再使用pdf2swf转换为swf文件,也就是flash文件在使用FlexPaper展示出来(优点:预览效果能接受,缺点:代码量大)

效果如图:

3. 使用Office online(优点:表现完美,缺点:不适合中小企业应用)

综合考虑决定使用第二种方法,经过次次波折终于可以使用,但是有个问题至今没有得到解决,调用Office组件的时候有时候会出现如下异常:

检索 COM 类工厂中 CLSID 为 {000209FF-0000-0000-C000-000000000046} 的组件失败,原因是出现以下错误: 8000401a 因为配置标识不正确,系统无法开始服务器进程。请检查用户名和密码。 (异常来自 HRESULT:0x8000401A),查阅无数资料还是不能解决,最让人不可接受的的是office文件必须标标准准毫无容错能力,当转换ppt文件时竟然会弹出转换进度框!!

好吧!那么我们改进它。

使用ASPOSE+pdf2swf+FlexPaper

关于ASPOSE大家可以到官网了解,这是款商业收费产品但是免费也可以使用

1、引用dll

2、编写转换帮助类


using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using Aspose.Cells;

using Aspose.Words;

using Aspose.Slides;

using System.Text.RegularExpressions;

using System.IO;

namespace Souxuexiao.Common {     /// <summary>     /// 第三方组件ASPOSE Office/WPS文件转换     /// Writer:Helen Joe     /// Date:2014-09-24     /// </summary>     public class AsposeUtils     {         /// <summary>         /// PFD转换器位置         /// </summary>         private static string _EXEFILENAME = System.Web.HttpContext.Current != null                 ? System.Web.HttpContext.Current.Server.MapPath("/pdf2swf/pdf2swf.exe")                 : System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory + "\\pdf2swf\\pdf2swf.exe");

        #region 1.01 Wrod文档转换为PDF文件 +ConvertDocToPdF(string sourceFileName, string targetFileName)         /// <summary>         /// Wrod文档转换为PDF文件         /// </summary>         /// <param name="sourceFileName">需要转换的Word全路径</param>         /// <param name="targetFileName">目标文件全路径</param>         /// <returns>转换是否成功</returns>         public static bool ConvertDocToPdF(string sourceFileName, string targetFileName)         {             Souxuexiao.API.Logger.error(string.Format("Wrod文档转换为PDF文件:sourceFileName={0},targetFileName={1}", sourceFileName, targetFileName));             try             {                 using (System.IO.Stream stream = new System.IO.FileStream(sourceFileName, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.ReadWrite))                 {                     Document doc = new Document(sourceFileName);                     doc.Save(targetFileName, Aspose.Words.SaveFormat.Pdf);                 }             }             catch (Exception ex)             {                 Souxuexiao.API.Logger.error(string.Format("Wrod文档转换为PDF文件执行ConvertDocToPdF发生异常原因是:{0}",ex.Message));             }             return System.IO.File.Exists(targetFileName);         }         #endregion

        #region 1.02 Excel文件转换为HTML文件 +(string sourceFileName, string targetFileName, string guid)         /// <summary>         /// Excel文件转换为HTML文件         /// </summary>         /// <param name="sourceFileName">Excel文件路径</param>         /// <param name="targetFileName">目标路径</param>         /// <returns>转换是否成功</returns>         public static bool ConvertExcelToHtml(string sourceFileName, string targetFileName)         {             Souxuexiao.API.Logger.info(string.Format("准备执行Excel文件转换为HTML文件,sourceFileName={0},targetFileName={1}",sourceFileName,targetFileName));             try             {                 using (System.IO.Stream stream = new System.IO.FileStream(sourceFileName, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.ReadWrite))                 {                     Aspose.Cells.Workbook workbook = new Workbook(stream);                     workbook.Save(targetFileName, Aspose.Cells.SaveFormat.Html);                 }             }             catch (Exception ex)             {                 Souxuexiao.API.Logger.error(string.Format("Excel文件转换为HTML文件ConvertExcelToHtml异常原因是:{0}", ex.Message));             }             return System.IO.File.Exists(targetFileName);         }         #endregion

        #region 1.03 将PowerPoint文件转换为PDF +ConvertPowerPointToPdf(string sourceFileName, string targetFileName)         /// <summary>         /// 将PowerPoint文件转换为PDF         /// </summary>         /// <param name="sourceFileName">PPT/PPTX文件路径</param>         /// <param name="targetFileName">目标文件路径</param>         /// <returns>转换是否成功</returns>         public static bool ConvertPowerPointToPdf(string sourceFileName, string targetFileName)         {             Souxuexiao.API.Logger.info(string.Format("准备执行PowerPoint转换PDF,sourceFileName={0},targetFileName={1}",sourceFileName,targetFileName));             try             {                 using (System.IO.Stream stream = new System.IO.FileStream(sourceFileName, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.ReadWrite))                 {                     Aspose.Slides.Pptx.PresentationEx pptx = new Aspose.Slides.Pptx.PresentationEx(stream);                     pptx.Save(targetFileName, Aspose.Slides.Export.SaveFormat.Pdf);                 }             }             catch (Exception ex)             {                 Souxuexiao.API.Logger.error(string.Format("将PowerPoint文件转换为PDFConvertExcelToHtml异常原因是:{0}", ex.Message));             }             return System.IO.File.Exists(targetFileName);         }         #endregion

        #region 2.01 读取pdf文件的总页数 +GetPageCount(string pdf_filename)         /// <summary>         /// 读取pdf文件的总页数         /// </summary>         /// <param name="pdf_filename">pdf文件</param>         /// <returns></returns>         public static int GetPageCountByPDF(string pdf_filename)         {             int pageCount = 0;             if (System.IO.File.Exists(pdf_filename))             {                 try                 {                     byte[] buffer = System.IO.File.ReadAllBytes(pdf_filename);                     if (buffer != null && buffer.Length > 0)                     {                         pageCount = -1;                         string pdfText = Encoding.Default.GetString(buffer);                         Regex regex = new Regex(@"/Type\s*/Page[^s]");                         MatchCollection conllection = regex.Matches(pdfText);                         pageCount = conllection.Count;                     }                 }                 catch (Exception ex)                 {                     Souxuexiao.API.Logger.error(string.Format("读取pdf文件的总页数执行GetPageCountByPowerPoint函数发生异常原因是:{0}", ex.Message));                 }             }             return pageCount;         }         #endregion

        #region 2.02 转换PDF文件为SWF格式 +PDFConvertToSwf(string pdfPath, string swfPath, int page)         /// <summary>         /// 转换PDF文件为SWF格式         /// </summary>         /// <param name="pdfPath">PDF文件路径</param>         /// <param name="swfPath">SWF生成目标文件路径</param>         /// <param name="page">PDF页数</param>         /// <returns>生成是否成功</returns>         public static bool PDFConvertToSwf(string pdfPath, string swfPath, int page)         {             StringBuilder sb = new StringBuilder();             sb.Append(" \"" + pdfPath + "\"");             sb.Append(" -o \"" + swfPath + "\"");             sb.Append(" -z");             //flash version             sb.Append(" -s flashversion=9");             //禁止PDF里面的链接             sb.Append(" -s disablelinks");             //PDF页数             sb.Append(" -p " + "\"1" + "-" + page + "\"");             //SWF中的图片质量             sb.Append(" -j 100");             string command = sb.ToString();             System.Diagnostics.Process p = null;             try             {                 using (p = new System.Diagnostics.Process())                 {                     p.StartInfo.FileName = _EXEFILENAME;                     p.StartInfo.Arguments = command;                     p.StartInfo.WorkingDirectory = System.IO.Path.GetDirectoryName(_EXEFILENAME);                     //不使用操作系统外壳程序 启动 线程                     p.StartInfo.UseShellExecute = false;                     //p.StartInfo.RedirectStandardInput = true;                     //p.StartInfo.RedirectStandardOutput = true;

                    //把外部程序错误输出写到StandardError流中(pdf2swf.exe的所有输出信息,都为错误输出流,用 StandardOutput是捕获不到任何消息的...                     p.StartInfo.RedirectStandardError = true;                     //不创建进程窗口                     p.StartInfo.CreateNoWindow = false;                     //启动进程                     p.Start();                     //开始异步读取                     p.BeginErrorReadLine();                     //等待完成                     p.WaitForExit();                 }             }             catch (Exception ex)             {                 Souxuexiao.API.Logger.error(string.Format("转换PDF文件为SWF格式执行PDFConvertToSwf函数发生异常原因是:{0}", ex.Message));             }             finally             {                 if (p != null)                 {                     //关闭进程                     p.Close();                     //释放资源                     p.Dispose();                 }             }             return File.Exists(swfPath);         }         #endregion     } } Office格式转换

3、将pdf文件转swf的转换器放到站点根目录下新建文件夹pdf2swf(我就是这么配置的,您随意)

4、配置FlexPaper

预览页面引用

 


 <script src="/FlexPaper/js/swfobject.js" type="text/javascript"></script>

<script type="text/javascript" src="/FlexPaper/js/flexpaper_flash.js"></script>

 

控件容器以及设置项


<div style="margin:0 auto;width:980px;">

            <div id="flashContent" style="display:none;"> 

                <p> 

                    To view this page ensure that Adobe Flash Player version 

                    10.0.0 or greater is installed. 

                </p> 

                <script type="text/javascript">

                    var pageHost = ((document.location.protocol == "https:") ? "https://" : "http://");

                    document.write("<a href='http://www.adobe.com/go/getflashplayer'><img src='" + pageHost + "www.adobe.com/images/shared/download_buttons/get_flash_player.gif' alt='Get Adobe Flash player' /></a>"); 

                </script> 

            </div>

        <script type="text/javascript">

            var _filename = document.getElementById("_filename").value;

            var swfVersionStr = "9.0.0";

            var xiSwfUrlStr = "playerProductInstall.swf";

            var flashvars = {

                SwfFile: escape(_filename),

                Scale: 0.6,

                ZoomTransition: "easeOut",

                ZoomTime: 0.5,

                ZoomInterval: 0.1,

                FitPageOnLoad: false,

                FitWidthOnLoad: true,

                PrintEnabled: true,

                FullScreenAsMaxWindow: false,

                ProgressiveLoading: true,

                PrintToolsVisible: true,                 ViewModeToolsVisible: true,                 ZoomToolsVisible: true,                 FullScreenVisible: true,                 NavToolsVisible: true,                 CursorToolsVisible: true,                 SearchToolsVisible: true,                 SearchMatchAll:true,

                localeChain: "zh_CN"             };             var params = {                 quality: "high",                 bgcolor: "#ffffff",                 allowscriptaccess: "sameDomain",                 allowfullscreen: "true"             }             var attributes = { id: "FlexPaperViewer", name: "FlexPaperViewer" };             swfobject.embedSWF("/FlexPaper/FlexPaperViewer.swf", "flashContent", "980", "620", swfVersionStr, xiSwfUrlStr, flashvars, params, attributes);             swfobject.createCSS("#flashContent", "display:block;text-align:left;");         </script>         </div>

document.getElementById("_filename").value是预览文件的路径
 
OK  大功告成  ,至于如何上传,怎么保存上传的文件等等那些逻辑我这里就省略了。。。。,但是有个建议,当用户上传文件之后调用转换api生成预览文件是个耗时的操作,

文件越大耗时越长,也就是说生成预览文件的时候是需要时间的,因此我使用异步方式生成预览文件。