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谈谈文件上传

July 8, 2009

公司一个项目中要实现对于复杂逻辑绑定的多文件异步上传，由于页面级组件都是用GWT编写，外加java本身的原因导致的form冗余，对于复杂逻辑的上传明显心有余而力不足，于是想到了用第三方组件实现。
由于本人对AS实在没有任何兴趣flash便舍弃，对于这个问题的解决不由想到了2个方案，silverlight/ActiveX +webservice
由于Silverlight具有平台的可移植性，相对ActiveX而言我更倾向于前者。当然Silverlight也有自己的问题，由于Silverlight 2.0的部分API封锁，导致无法直接通过File得到文件流，只能通过自带的OpenFileDialog.File方法来得到，不由增加了原来和GWT的耦合性。

 
using System; 
using System.Collections.Generic; 
using System.Windows; 
using System.Windows.Controls; 
using System.IO; 
using System.Windows.Browser; 
using System.Threading; 
using wondersgroup.Silverlight.FileWebService; 
 
namespace wondersgroup.Silverlight 
{ 
    public partial class Page : UserControl 
    { 
        private const string client_openDialoged_fuc = "client_openDialoged"; 
        private const string client_uploadcompleted_fuc = "client_uploadcompleted"; 
 
        private  Thread t; 
        private List<FileInfo> fis=new List<FileInfo>(); 
        private delegate void FileDelegate(string name); 
        public Page() 
        { 
            InitializeComponent(); 
            HtmlPage.RegisterScriptableObject("Attribute", this); 
        } 
        [ScriptableMember] 
        public void OpenFileDialog() 
        { 
            FileStream fs; 
            OpenFileDialog openFileDialog1 = new OpenFileDialog(); 
            openFileDialog1.Filter = "All files (*.*)|*.*"; 
            if (openFileDialog1.ShowDialog() ==true) 
            { 
 
                    FileInfo fi = openFileDialog1.File; 
                    if ((fs = fi.OpenRead()) != null) 
                    { 
                        fis.Add(fi);  
                        HtmlPage.Window.Invoke(client_openDialoged_fuc, fi.Name); 
                    } 
            } 
        } 
        [ScriptableMember] 
        public void RemoveFile(string filename) 
        { 
            foreach (FileInfo fi in fis) 
            { 
                if (fi.Name == filename) 
                { 
                    fis.Remove(fi); 
                    return; 
                } 
            } 
        } 
 
        [ScriptableMember] 
        public void Upload() 
        { 
            bd.Text = "上传中"; 
            foreach (FileInfo fi in fis) 
            { 
                t = new Thread(new ParameterizedThreadStart(UploadFile)); 
                t.Start(fi); 
            } 
        } 
        private void client_UploadFileCompleted(object sender, UploadFileCompletedEventArgs e) 
        { 
            if (this.Dispatcher.CheckAccess()) UploadFileCompleted(e.Result); 
            else this.Dispatcher.BeginInvoke(new FileDelegate(UploadFileCompleted), e.Result); 
        } 
        private void UploadFileCompleted(string r) 
        { 
            HtmlPage.Window.Invoke(client_uploadcompleted_fuc, r); 
            bd.Text = r + "上传完成"; 
        } 
 
        private void UploadFile(object f) 
        { 
            FileInfo fi = (FileInfo)f; 
            FileStream fs = fi.OpenRead(); 
            int nBytes = (int)fs.Length; 
            byte[] ByteArray = new byte[nBytes]; 
            fs.Read(ByteArray, 0, nBytes); 
            fs.Close(); 
            FileWebServiceSoapClient client = new FileWebServiceSoapClient(); 
            //client.Endpoint.Address = new System.ServiceModel.EndpointAddress(" http://" + HtmlPage.Document.DocumentUri.Host + "/FileWebService.asmx"); 
            client.UploadFileAsync(ByteArray, fi.Name); 
            client.UploadFileCompleted += new EventHandler<UploadFileCompletedEventArgs>(client_UploadFileCompleted); 
        } 
 
 
    } 
} 

using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.IO;
using System.Windows.Browser;
using System.Threading;
using wondersgroup.Silverlight.FileWebService;

namespace wondersgroup.Silverlight
{
    public partial class Page : UserControl
    {
        private const string client_openDialoged_fuc = "client_openDialoged";
        private const string client_uploadcompleted_fuc = "client_uploadcompleted";

        private  Thread t;
        private List<FileInfo> fis=new List<FileInfo>();
        private delegate void FileDelegate(string name);
        public Page()
        {
            InitializeComponent();
            HtmlPage.RegisterScriptableObject("Attribute", this);
        }
        [ScriptableMember]
        public void OpenFileDialog()
        {
            FileStream fs;
            OpenFileDialog openFileDialog1 = new OpenFileDialog();
            openFileDialog1.Filter = "All files (*.*)|*.*";
            if (openFileDialog1.ShowDialog() ==true)
            {

                    FileInfo fi = openFileDialog1.File;
                    if ((fs = fi.OpenRead()) != null)
                    {
                        fis.Add(fi); 
                        HtmlPage.Window.Invoke(client_openDialoged_fuc, fi.Name);
                    }
            }
        }
        [ScriptableMember]
        public void RemoveFile(string filename)
        {
            foreach (FileInfo fi in fis)
            {
                if (fi.Name == filename)
                {
                    fis.Remove(fi);
                    return;
                }
            }
        }

        [ScriptableMember]
        public void Upload()
        {
            bd.Text = "上传中";
            foreach (FileInfo fi in fis)
            {
                t = new Thread(new ParameterizedThreadStart(UploadFile));
                t.Start(fi);
            }
        }
        private void client_UploadFileCompleted(object sender, UploadFileCompletedEventArgs e)
        {
            if (this.Dispatcher.CheckAccess()) UploadFileCompleted(e.Result);
            else this.Dispatcher.BeginInvoke(new FileDelegate(UploadFileCompleted), e.Result);
        }
        private void UploadFileCompleted(string r)
        {
            HtmlPage.Window.Invoke(client_uploadcompleted_fuc, r);
            bd.Text = r + "上传完成";
        }

        private void UploadFile(object f)
        {
            FileInfo fi = (FileInfo)f;
            FileStream fs = fi.OpenRead();
            int nBytes = (int)fs.Length;
            byte[] ByteArray = new byte[nBytes];
            fs.Read(ByteArray, 0, nBytes);
            fs.Close();
            FileWebServiceSoapClient client = new FileWebServiceSoapClient();
            //client.Endpoint.Address = new System.ServiceModel.EndpointAddress(" http://" + HtmlPage.Document.DocumentUri.Host + "/FileWebService.asmx");
            client.UploadFileAsync(ByteArray, fi.Name);
            client.UploadFileCompleted += new EventHandler<UploadFileCompletedEventArgs>(client_UploadFileCompleted);
        }


    }
}

为了避免大量和GWT的关联，因此同过了一些小窍门绕开了无法通过File得到文件流的问题，[ScriptableMember]属性标记的是可供客户端JS（GWT）调用的方法。

 
<p>
      <div id="content">
      </div>
      <input id="Button1" type="button" value="加入" onclick="return Button1_onclick()" /><input
          id="Button2" type="button" value="上传" onclick="return Button2_onclick()" /></p>
  <form id="form1" runat="server" style="height: 100%;">
  <asp:ScriptManager ID="ScriptManager1" runat="server">
  </asp:ScriptManager>
  <div style="height: 100%;">
      <asp:Silverlight ID="Xaml1" runat="server" Source="ClientBin/UploadFile.xap" MinimumVersion="2.0.31005.0"
          Width="300px" Height="32px" OnPluginLoaded="pluginloaded" />
  </div>
 
<script language="javascript" type="text/javascript">
 <!CDATA[ 
      var silverlightjs; 
      function pluginloaded() { 
          silverlightjs = $get('Xaml1').content.Attribute; 
      } 
      function Button1_onclick() { 
          silverlightjs.OpenFileDialog(); 
      } 
      function Button2_onclick() { 
          silverlightjs.Upload(); 
      } 
      function client_openDialoged(name) { 
          var node = document.createElement("<div onclick=remove_node('" + name + "') id='content_" + name + "'>"); 
          node.innerText = name; 
          document.getElementById("content").appendChild(node); 
      } 
      function remove_node(name) { 
          var node = document.getElementById("content_" + name); 
          document.getElementById("content").removeChild(node); 
          silverlightjs.RemoveFile(name); 
      } 
      function client_uploadcompleted(msg) { 
          alert(msg); 
      } 
 ]]>
  </script>

  <p>
        <div id="content">
        </div>
        <input id="Button1" type="button" value="加入" onclick="return Button1_onclick()" /><input
            id="Button2" type="button" value="上传" onclick="return Button2_onclick()" /></p>
    <form id="form1" runat="server" style="height: 100%;">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <div style="height: 100%;">
        <asp:Silverlight ID="Xaml1" runat="server" Source="ClientBin/UploadFile.xap" MinimumVersion="2.0.31005.0"
            Width="300px" Height="32px" OnPluginLoaded="pluginloaded" />
    </div>

  <script language="javascript" type="text/javascript">
// <!CDATA[
        var silverlightjs;
        function pluginloaded() {
            silverlightjs = $get('Xaml1').content.Attribute;
        }
        function Button1_onclick() {
            silverlightjs.OpenFileDialog();
        }
        function Button2_onclick() {
            silverlightjs.Upload();
        }
        function client_openDialoged(name) {
            var node = document.createElement("<div onclick=remove_node('" + name + "') id='content_" + name + "'>");
            node.innerText = name;
            document.getElementById("content").appendChild(node);
        }
        function remove_node(name) {
            var node = document.getElementById("content_" + name);
            document.getElementById("content").removeChild(node);
            silverlightjs.RemoveFile(name);
        }
        function client_uploadcompleted(msg) {
            alert(msg);
        }
// ]]>
    </script>

通过客户端调用silverlight的silverlightjs.OpenFileDialog();来获取文件的File，silverlight将每次获取的Fileinfo放入List后执行HtmlPage.Window.Invoke(“client_openDialoged”, fi.Name);来调取客户端js的client_openDialoged方法，当然当客户端从文件列表中删除一个文件后也调用silverlight的RemoveFile方法从List删除，多线程上传完毕后通过调用客户端的方法client_uploadcompleted来做到callback。值得注意的是客户端javascript调用silverlight方法需要 var silverlightjs;function pluginloaded() { silverlightjs = $get('Xaml1').content.Attribute; } 来获取对象并在服务器端初始化时注册HtmlPage.RegisterScriptableObject("Attribute", this);

运用这个上传组件主要是问题出来耦合性上，即OpenFileDialog由自己弹出。

关于ActiveX，由于公司暂时没有可供签名的CA，必须要求IE浏览器更改安全级别，并且即使这样做也无法再vista+IE8下使用，因此实用性以及安全性降低。在多线程环境下，ActiveX有一个很麻烦的地方，在于javascript调用ActiveX方法容易，而反过来却十分困难，问题出在一个COM组件上。通常，ActiveX调用js需要借助ms的组件Microsoft.mshtml，以此来访问自身容器的DOM，方法很简单。引用之后

 
//obj为客户端js中的window对象 
//execscriptname为客户端js的函数名 
//msg 为参数 
HTMLWindow2Class html = (HTMLWindow2Class)obj; 
html.execScript(execscriptname+"('" + msg + "');", "javascript");

//obj为客户端js中的window对象
//execscriptname为客户端js的函数名
//msg 为参数
HTMLWindow2Class html = (HTMLWindow2Class)obj;
html.execScript(execscriptname+"('" + msg + "');", "javascript");

但是，这个方法有一个很大的BUG----------它是线程不安全的！！！如果单纯的不安全，我可以用委托或则建立线程是运用ParameterizedThreadStart来绕过，但是它的问题是HTMLWindow2Class html = (HTMLWindow2Class)obj;只能执行在主线程中，任何其他线程哪怕是你把window对象作为参数给他也是无法调用的，而且会出现一个未知错误！！诡异。。。

好吧，既然如此，只能用流氓方法解决了，在主线程中执行

 
using System; 
using System.Windows.Forms; 
using System.IO; 
using System.Threading; 
using mshtml; 
using wondersgroup.FileWs; 
using System.Runtime.InteropServices; 
using System.Security.Permissions; 
using System.Collections.Generic; 
namespace wondersgroup.ActiveX 
{ 
 
    [PermissionSet(SecurityAction.Assert, Name = "FullTrust")] 
    [ClassInterface(ClassInterfaceType.AutoDual)] 
    public class FileUpload : System.Windows.Forms.UserControl, IFileUpload 
    { 
        #region Initialization 
 
        private string files; 
        private string url= (new FileWebService()).Url; 
        private List<string> msg = new List<string>(); 
        private List<Thread> threads = new List<Thread>(); 
        public FileUpload() 
        { 
 
        } 
        protected override void Dispose(bool disposing) 
        { 
            foreach (Thread t in threads) 
            { 
                t.Abort(); 
            } 
            base.Dispose(); 
        } 
 
 
        #endregion 
        #region Public 
        public String FilePaths 
        { 
            get { return files; } 
            set
            { 
                files = value; 
            } 
        } 
        public String Url 
        { 
            get { return url; } 
            set
            { 
                url = value; 
            } 
        } 
 
        public void Upload(object window,string execscriptname) 
        { 
 
            string[] _files = files.Split('|'); 
            foreach (string s in _files) 
            { 
                Thread t = new Thread(new ParameterizedThreadStart(UploadFile)); 
                threads.Add(t); 
                t.Start(s); 
            } 
            int _threadnum = _files.Length; 
            string _temp = string.Empty; 
            while (true && _threadnum != 0) 
            { 
                if (msg.Count != 0) 
                { 
                    _temp = msg[msg.Count - 1]; 
                    lock (msg) 
                    { 
                        msg.Remove(_temp); 
                    } 
                    UploadFileCompleted(window, _temp, execscriptname); 
                    _threadnum--; 
                } 
 
                Thread.Sleep(1000); 
            } 
        } 
        #endregion 
 
        #region Private 
        private void UploadFile(object s) 
        { 
            string _file = s.ToString(); 
            if (File.Exists(_file)) 
            { 
                FileInfo fi = new FileInfo(_file); 
                FileStream fs = fi.OpenRead(); 
                int nBytes = (int)fs.Length; 
                byte[] ByteArray = new byte[nBytes]; 
                fs.Read(ByteArray, 0, nBytes); 
                fs.Close(); 
                FileWebService client = new FileWebService(); 
                string rt = client.UploadFile(ByteArray, fi.Name); 
                lock (msg) 
                { 
                    msg.Add(rt); 
                } 
            } 
        } 
 
        private void UploadFileCompleted(object obj, string msg,string execscriptname) 
        { 
            try
            { 
                HTMLWindow2Class html = (HTMLWindow2Class)obj; 
                html.execScript(execscriptname+"('" + msg + "');", "javascript"); 
            } 
            catch (Exception e) { MessageBox.Show(e.Message, "ActiveX Error"); } 
        } 
        #endregion 
 
 
 
    } 
} 

using System;
using System.Windows.Forms;
using System.IO;
using System.Threading;
using mshtml;
using wondersgroup.FileWs;
using System.Runtime.InteropServices;
using System.Security.Permissions;
using System.Collections.Generic;
namespace wondersgroup.ActiveX
{

    [PermissionSet(SecurityAction.Assert, Name = "FullTrust")]
    [ClassInterface(ClassInterfaceType.AutoDual)]
    public class FileUpload : System.Windows.Forms.UserControl, IFileUpload
    {
        #region Initialization

        private string files;
        private string url= (new FileWebService()).Url;
        private List<string> msg = new List<string>();
        private List<Thread> threads = new List<Thread>();
        public FileUpload()
        {

        }
        protected override void Dispose(bool disposing)
        {
            foreach (Thread t in threads)
            {
                t.Abort();
            }
            base.Dispose();
        }


        #endregion
        #region Public
        public String FilePaths
        {
            get { return files; }
            set
            {
                files = value;
            }
        }
        public String Url
        {
            get { return url; }
            set
            {
                url = value;
            }
        }

        public void Upload(object window,string execscriptname)
        {

            string[] _files = files.Split('|');
            foreach (string s in _files)
            {
                Thread t = new Thread(new ParameterizedThreadStart(UploadFile));
                threads.Add(t);
                t.Start(s);
            }
            int _threadnum = _files.Length;
            string _temp = string.Empty;
            while (true && _threadnum != 0)
            {
                if (msg.Count != 0)
                {
                    _temp = msg[msg.Count - 1];
                    lock (msg)
                    {
                        msg.Remove(_temp);
                    }
                    UploadFileCompleted(window, _temp, execscriptname);
                    _threadnum--;
                }

                Thread.Sleep(1000);
            }
        }
        #endregion

        #region Private
        private void UploadFile(object s)
        {
            string _file = s.ToString();
            if (File.Exists(_file))
            {
                FileInfo fi = new FileInfo(_file);
                FileStream fs = fi.OpenRead();
                int nBytes = (int)fs.Length;
                byte[] ByteArray = new byte[nBytes];
                fs.Read(ByteArray, 0, nBytes);
                fs.Close();
                FileWebService client = new FileWebService();
                string rt = client.UploadFile(ByteArray, fi.Name);
                lock (msg)
                {
                    msg.Add(rt);
                }
            }
        }

        private void UploadFileCompleted(object obj, string msg,string execscriptname)
        {
            try
            {
                HTMLWindow2Class html = (HTMLWindow2Class)obj;
                html.execScript(execscriptname+"('" + msg + "');", "javascript");
            }
            catch (Exception e) { MessageBox.Show(e.Message, "ActiveX Error"); }
        }
        #endregion



    }
}

接口

 
using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Runtime.InteropServices; 
 
namespace wondersgroup.ActiveX 
{ 
    [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)] 
    public interface IFileUpload 
    { 
        /// <summary> 
        /// Get or set the files' path with "|" that will upload 
        /// eg:c:\aa.txt|d:\bb.txt 
        /// </summary> 
         String FilePaths { set; get; } 
 
        /// <summary> 
        /// Get or set the webservice url 
        /// default is http://localhost:1707/FileWebService.asmx 
        /// </summary> 
         String Url { set; get; } 
 
        /// <summary> 
         /// Upload files set by FilePaths 
        /// </summary> 
        /// <param name="window">javascript window object</param> 
        /// <param name="execscriptname">the js function to callback</param> 
         void Upload(object window, string execscriptname); 
    } 
    
} 

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace wondersgroup.ActiveX
{
    [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
    public interface IFileUpload
    {
        /// <summary>
        /// Get or set the files' path with "|" that will upload
        /// eg:c:\aa.txt|d:\bb.txt
        /// </summary>
         String FilePaths { set; get; }

        /// <summary>
        /// Get or set the webservice url
        /// default is http://localhost:1707/FileWebService.asmx
        /// </summary>
         String Url { set; get; }

        /// <summary>
         /// Upload files set by FilePaths
        /// </summary>
        /// <param name="window">javascript window object</param>
        /// <param name="execscriptname">the js function to callback</param>
         void Upload(object window, string execscriptname);
    }
   
}

客户端调用则相对比较简单

 
<script>
        var obj = new ActiveXObject("wondersgroup.FileUpload"); 
    </script>
 
    <div id="content">
    </div>
    <input id="File1" type="file" /><input id="Button1" type="button" value="add to list"
        onclick="client_openDialoged(File1.value);" />
    <input type="submit" name="button" id="button" value="提交至ActiveX" onclick="post()" />
    <input type="button"  value='上传' onclick='upload()'>
    <script>
        var i = 0; 
        obj.Url = "http://localhost:1707/FileWebService.asmx"; 
        function client_openDialoged(name) { 
            var node = document.createElement("<div onclick=remove_node('" + i + "') id='content_" + i + "'>"); 
            node.innerText = name; 
            document.getElementById("content").appendChild(node); 
            i++; 
        } 
        function post() { 
            var _str = ""; 
            var temp = document.getElementById("content").childNodes; 
            for (ii = 0; ii < temp.length; ii++) { 
                _str += temp(ii).innerText + (ii == (temp.length - 1) ? "" : "|"); 
            } 
            obj.FilePaths = _str; 
        } 
        function upload() { 
            obj.Upload(window, "uploadSucc"); 
        } 
        function remove_node(name) { 
            var node = document.getElementById("content_" + name); 
            document.getElementById("content").removeChild(node); 
        } 
        function uploadSucc(str) { 
            alert("remote result: "+str); 
        } 
    </script>

<script>
        var obj = new ActiveXObject("wondersgroup.FileUpload");
    </script>

    <div id="content">
    </div>
    <input id="File1" type="file" /><input id="Button1" type="button" value="add to list"
        onclick="client_openDialoged(File1.value);" />
    <input type="submit" name="button" id="button" value="提交至ActiveX" onclick="post()" />
    <input type="button"  value='上传' onclick='upload()'>
    <script>
        var i = 0;
        obj.Url = "http://localhost:1707/FileWebService.asmx";
        function client_openDialoged(name) {
            var node = document.createElement("<div onclick=remove_node('" + i + "') id='content_" + i + "'>");
            node.innerText = name;
            document.getElementById("content").appendChild(node);
            i++;
        }
        function post() {
            var _str = "";
            var temp = document.getElementById("content").childNodes;
            for (ii = 0; ii < temp.length; ii++) {
                _str += temp(ii).innerText + (ii == (temp.length - 1) ? "" : "|");
            }
            obj.FilePaths = _str;
        }
        function upload() {
            obj.Upload(window, "uploadSucc");
        }
        function remove_node(name) {
            var node = document.getElementById("content_" + name);
            document.getElementById("content").removeChild(node);
        }
        function uploadSucc(str) {
            alert("remote result: "+str);
        }
    </script>

唯一一点要注意的是手工使用regasm FileUpload.dll /tlb /codebase注册这个dll

 
//webservice 
        [WebMethod(Description = "Web 服务提供的方法，返回是否文件上载成功与否。")] 
        public string UploadFile(byte[] fs, string filename) 
        { 
            try
            { 
                MemoryStream m = new MemoryStream(fs); 
                string relative=DateTime.Now.ToString("yyyy_MM_dd_mm_ss_") + filename; 
                string path = Server.MapPath("uload") + "\\" + relative; 
                FileStream f = new FileStream(path, FileMode.Create); 
                m.WriteTo(f); 
                m.Close(); 
                f.Close(); 
                f = null; 
                m = null; 
                return relative; 
            } 
            catch(Exception e) 
            { 
                return e.Message; 
            } 
        }

//webservice
        [WebMethod(Description = "Web 服务提供的方法，返回是否文件上载成功与否。")]
        public string UploadFile(byte[] fs, string filename)
        {
            try
            {
                MemoryStream m = new MemoryStream(fs);
                string relative=DateTime.Now.ToString("yyyy_MM_dd_mm_ss_") + filename;
                string path = Server.MapPath("uload") + "\\" + relative;
                FileStream f = new FileStream(path, FileMode.Create);
                m.WriteTo(f);
                m.Close();
                f.Close();
                f = null;
                m = null;
                return relative;
            }
            catch(Exception e)
            {
                return e.Message;
            }
        }

e4321172-ed0d-4716-932c-593b22c74d1e|0|.0

edwin earlier 文件上传, 异步, ActiveX, Silverlight, javascript, HTMLWindow2Class, HTMLWindow2Class, COM Comments (12)

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