.net 实现Office文件预览 Word PPT Excel 2015-01-23 08:47 63人阅读 评论(0) 收藏

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近期公司要求上传的PPT和Word都需要可以在线预览..

小弟我是从来没有接触过这一块的东西 感觉很棘手..不过网络是强大的,还是让我找到了解决方案,记载一下.

要实现无任何插件的预览,swf文件是比较好的. PDF则需要有这个插件才能预览..那么转换的过程如下

以PPT 为例 : PPT →(由ASPOSE转换)→ PDF文件 →(由pdf2swf转换)→Swf文件  最终由EXTJS嵌入FlexPaper的形式展示

效果如下:

首先贴出后台处理文件的officeHelper代码(这里借鉴了别人的操作.)

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)
        {
            
            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(@"/Types*/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
    }
}

我们获取了文件之后可以由上面的类进行转换然后存在服务器

将pdf文件转swf的转换器放到站点根目录下新建文件夹pdf2swf（这里必须配置不然无法转换,当然位置可以随意,类中的地址需要修改）

转换完成之后,我们需要用 FlexPaper进行展示,代码如下:

<pre style="margin-top: 0px; margin-bottom: 0px; white-space: pre-wrap; word-wrap: break-word; line-height: 18px; font-family: 'Courier New' !important;"><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;"><</span><span style="color: rgb(128, 0, 0); line-height: 1.5 !important;">script </span><span style="color: rgb(255, 0, 0); line-height: 1.5 !important;">src</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">="/FlexPaper/js/swfobject.js"</span><span style="color: rgb(255, 0, 0); line-height: 1.5 !important;"> type</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">="text/javascript"</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">></</span><span style="color: rgb(128, 0, 0); line-height: 1.5 !important;">script</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">></span>
    <span style="color: rgb(0, 0, 255); line-height: 1.5 !important;"><</span><span style="color: rgb(128, 0, 0); line-height: 1.5 !important;">script </span><span style="color: rgb(255, 0, 0); line-height: 1.5 !important;">type</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">="text/javascript"</span><span style="color: rgb(255, 0, 0); line-height: 1.5 !important;"> src</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">="/FlexPaper/js/flexpaper_flash.js"</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">></</span><span style="color: rgb(128, 0, 0); line-height: 1.5 !important;">script</span><span style="color: rgb(0, 0, 255); line-height: 1.5 !important;">></span>

</pre><pre name="code" class="html" style="background-color: rgb(255, 255, 255);"><span style="color:#333333;"><div style="margin:0 auto;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></span>

其中

document.getElementById("_filename").value是预览文件的路径,大家可以随意修改.

写在最后,这个转换的过程比较复杂,也比较耗时 测试7M左右的PPT需要1-2分钟转换,所以推荐在文件上传后第一次预览时进行异步转换,然后存在本地,第二次就直接拿上一次的进行显示.

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