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实现支持文件分块多点异步上传的 Web Services 及其客户端(非Web)应用程序调用相关异步执行的 Web Method本文的客户端应用程序不包括 ASP.Net Web 应用程序!本文假设 URL: http://localhost/mywebservices/updownload.asmx共有 4 个程序文件 (Web.Config 就不赘述了)Server Side:标题中所提到的 "异步" 其实在服务器端的程序并没有什么特殊的,而主要是通过客户端应用程序异步调用相关 Web Method 实现的!1. updownload.asmx ,位于 IIS 的某个 Web 共享目录,代码如下,只有一句话:<%@ WebService Language="c#" Codebehind="UpDownLoad.asmx.cs" Class="Service1" %>2. updownload.asmx.cs ,即: updownload.asmx 的 Codebehind ,位于 IIS 的某个 Web 共享目录的 bin 子目录下,代码如下:/*本文件位于 Web 共享目录的 bin 子目录下,通过执行如下命令行编译:csc /t:library updownload.asmx.cs*/using System.Diagnostics;using System.Web;using System.Web.Services;using System.IO;using System;public class Service1 : System.Web.Services.WebService{[WebMethod]public string HelloWorld(){return "Hello World";}//从 Web Method 本身,其实看不出 "同步" 还是 "异步"[WebMethod(Description = "为了支持多点分块异步上传文件,此方法必须由客户端预先调用,以便在服务器端生成指定 FileName 和 Length 大小的空白文件预定空间! 建议客户端同步调用")]public string CreateBlankFile(string FileName,int Length) //建议由客户端同步调用{FileStream fs = new FileStream(Server.MapPath(".") + "\\" + FileName, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None);fs.Write(new byte[Length], 0, Length);fs.Close();fs = null;return FileName + " (" + Length + ") 空白文件已经创建!";}[WebMethod(Description = "提供一个用于一次完整上传整个文件的方法! 建议客户端同步调用")]public string UploadFileBytes(byte[] Bytes,string FileName){return UploadFileChunkBytes(Bytes, 0, FileName);}[WebMethod(Description = "提供一个用于一次只上传由 Position 位置起始的, Bytes 字节的 FileName 文件块存入服务器端相应文件的相应字节位置! 建议客户端异步调用")]// 这里只要多提供一个 Position 参数,余下的再由客户端调用异步的该方法,就轻松达到目的了!public string UploadFileChunkBytes(byte[] Bytes,int Position,string FileName){try{FileStream fs = new FileStream(Server.MapPath(".") + "\\" + FileName, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite);//该 Bytes 的字节要写到 服务器端 相应文件的从 Position 开始的字节fs.Position = Position;fs.Write(Bytes, 0, Bytes.Length);fs.Close();fs = null;return FileName + " 文件块: 位置[" + Position + "," + (Position + Bytes.Length) + "] 大小(" + Bytes.Length + ") 上传成功!";}catch (Exception e){return e.Message;}}[WebMethod]public byte[] DownloadFileBytes(string FileName){if (File.Exists(FileName)){try{FileStream fs = File.OpenRead(FileName);int i = (int) fs.Length;byte[] ba = new byte[i];fs.Read(ba,0,i);fs.Close();return ba;}catch{return new byte[0];}}else{return new byte[0];}}}//=======================================================================Client Side:3. UpDownloadProxy.cs :本文件由如下命令生成% Visual Studio .Net 2003 安装目录下的 %\SDK\v1.1\Bin\wsdl.exe具体命令行如下:wsdl.exe /l:CS /out:UpDownloadProxy.cs http://localhost/MyWebServices/updownload.asmx?wsdl生成的本地的客户端代理类代码里已经为每个 Web Method 生成了可异步和同步执行的方法,例如: public string HelloWorld() {} public System.IAsyncResult BeginHelloWorld(...) {} public string EndHelloWorld(...) {}下面是该命令行生成的完整的 UpDownloadProxy.cs 代码,就不修改了:/*通过执行如下命令行编译,生成 UpDownloadProxy.dll :csc /t:library UpDownloadProxy.cs*///------------------------------------------------------------------------------// // This code was generated by a tool.// Runtime Version: 1.1.4322.573//// Changes to this file may cause incorrect behavior and will be lost if// the code is regenerated.// //------------------------------------------------------------------------------//// 此源代码由 wsdl, Version=1.1.4322.573 自动生成。//using System.Diagnostics;using System.Xml.Serialization;using System;using System.Web.Services.Protocols;using System.ComponentModel;using System.Web.Services;/// [System.Diagnostics.DebuggerStepThroughAttribute()][System.ComponentModel.DesignerCategoryAttribute("code")][System.Web.Services.WebServiceBindingAttribute(Name="Service1Soap", Namespace="http://tempuri.org/")]public class Service1 : System.Web.Services.Protocols.SoapHttpClientProtocol { /// public Service1() { this.Url = "http://localhost/MyWebServices/updownload.asmx"; } /// [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://tempuri.org/HelloWorld", RequestNamespace="http://tempuri.org/", ResponseNamespace="http://tempuri.org/", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)] public string HelloWorld() { object[] results = this.Invoke("HelloWorld", new object[0]); return ((string)(results[0])); } /// public System.IAsyncResult BeginHelloWorld(System.AsyncCallback callback, object asyncState) { return this.BeginInvoke("HelloWorld", new object[0], callback, asyncState); } /// public string EndHelloWorld(System.IAsyncResult asyncResult) { object[] results = this.EndInvoke(asyncResult); return ((string)(results[0])); } /// [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://tempuri.org/CreateBlankFile", RequestNamespace="http://tempuri.org/", ResponseNamespace="http://tempuri.org/", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)] public string CreateBlankFile(string FileName, int Length) { object[] results = this.Invoke("CreateBlankFile", new object[] { FileName, Length}); return ((string)(results[0])); } /// public System.IAsyncResult BeginCreateBlankFile(string FileName, int Length, System.AsyncCallback callback, object asyncState) { return this.BeginInvoke("CreateBlankFile", new object[] { FileName, Length}, callback, asyncState); } /// public string EndCreateBlankFile(System.IAsyncResult asyncResult) { object[] results = this.EndInvoke(asyncResult); return ((string)(results[0])); } /// [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://tempuri.org/UploadFileBytes", RequestNamespace="http://tempuri.org/", ResponseNamespace="http://tempuri.org/", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)] public string UploadFileBytes([System.Xml.Serialization.XmlElementAttribute(DataType="base64Binary")] System.Byte[] Bytes, string FileName) { object[] results = this.Invoke("UploadFileBytes", new object[] { Bytes, FileName}); return ((string)(results[0])); } /// public System.IAsyncResult BeginUploadFileBytes(System.Byte[] Bytes, string FileName, System.AsyncCallback callback, object asyncState) { return this.BeginInvoke("UploadFileBytes", new object[] { Bytes, FileName}, callback, asyncState); } /// public string EndUploadFileBytes(System.IAsyncResult asyncResult) { object[] results = this.EndInvoke(asyncResult); return ((string)(results[0])); } /// [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://tempuri.org/UploadFileChunkBytes", RequestNamespace="http://tempuri.org/", ResponseNamespace="http://tempuri.org/", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)] public string UploadFileChunkBytes([System.Xml.Serialization.XmlElementAttribute(DataType="base64Binary")] System.Byte[] Bytes, int Position, string FileName) { object[] results = this.Invoke("UploadFileChunkBytes", new object[] { Bytes, Position, FileName}); return ((string)(results[0])); } /// public System.IAsyncResult BeginUploadFileChunkBytes(System.Byte[] Bytes, int Position, string FileName, System.AsyncCallback callback, object asyncState) { return this.BeginInvoke("UploadFileChunkBytes", new object[] { Bytes, Position, FileName}, callback, asyncState); } /// public string EndUploadFileChunkBytes(System.IAsyncResult asyncResult) { object[] results = this.EndInvoke(asyncResult); return ((string)(results[0])); } /// [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://tempuri.org/DownloadFileBytes", RequestNamespace="http://tempuri.org/", ResponseNamespace="http://tempuri.org/", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Wrapped)] [return: System.Xml.Serialization.XmlElementAttribute(DataType="base64Binary")] public System.Byte[] DownloadFileBytes(string FileName) { object[] results = this.Invoke("DownloadFileBytes", new object[] { FileName}); return ((System.Byte[])(results[0])); } /// public System.IAsyncResult BeginDownloadFileBytes(string FileName, System.AsyncCallback callback, object asyncState) { return this.BeginInvoke("DownloadFileBytes", new object[] { FileName}, callback, asyncState); } /// public System.Byte[] EndDownloadFileBytes(System.IAsyncResult asyncResult) { object[] results = this.EndInvoke(asyncResult); return ((System.Byte[])(results[0])); }}//=======================================================================4. UpDownloadClient.cs :该程序才是真正实现文件分块多点异步上传的核心代码:/*通过执行如下命令行编译:csc updownloadClient.cs /r:updownloadproxy.dll*/using System;using System.IO;public class Class1{static void Main(string[] args){//Download(ServerSidepath, ClientSidePath)Download(@"e:\test.jpg", @"f:\test_local.jpg");System.Console.WriteLine("down End");System.Console.WriteLine("同步 up file exec ...");UploadFile(@"e:\Northwind.mdb");System.Console.WriteLine("同步 up file End\n");System.Console.WriteLine("异步 up chunks exec ...");UploadFileChunks(@"e:\test.rar", 64);System.Console.ReadLine();}public static void UploadFile(string LocalFileName){Service1 xx = new Service1();FileStream fs = new FileStream(LocalFileName, FileMode.Open); //Client Side Pathbyte[] buffer = new byte[fs.Length];fs.Read(buffer, 0, buffer.Length);//调用 "同步执行" 的本地 Web Sevices 代理类的 方法,相当于同步调用了 Web Method !xx.UploadFileBytes(buffer, System.IO.Path.GetFileName(LocalFileName));}//指定要上传的本地文件的路径,及每次上传文件块的大小public static void UploadFileChunks(string LocalFileName,int ChunkSize){Service1 xx = new Service1();string filename = System.IO.Path.GetFileName(LocalFileName);FileStream fs = new FileStream(LocalFileName, FileMode.Open); //Client Side Path//fs = File.OpenRead(LocalFileName);int r = (int) fs.Length; //用于记录剩余还未上传的字节数,初值是文件的大小//调用 "同步执行" 的本地 Web Sevices 代理类的 方法,相当于同步调用了 Web Method !//预定服务器端空间xx.CreateBlankFile(filename,r);int size = ChunkSize * 1024;int k = 0; //用于记录已经上传的字节数i++; //用于记录上传的文件块数while (r >= size){byte[] buffer = new byte[size];fs.Read(buffer,0,buffer.Length);//调用 "异步执行" 的本地 Web Sevices 代理类的 方法,相当于异步调用了 Web Method !//该 buffer 的字节要写到 服务器端 相应文件的从 Position = k 开始的字节xx.BeginUploadFileChunkBytes(buffer,k,filename,new AsyncCallback(UploadFileChunkCallback),xx);k += size;r -= size;i++;}if (r > 0) //剩余的零头{byte[] buffer = new byte[r];fs.Read(buffer,0,buffer.Length);//调用 "异步执行" 的本地 Web Sevices 代理类的 方法,相当于异步调用了 Web Method !//该 buffer 的字节要写到 服务器端 相应文件的从 Position = k 开始的字节xx.BeginUploadFileChunkBytes(buffer,k,filename,new AsyncCallback(UploadFileChunkCallback),xx);i++;}fs.Close();}private static int i = -1; //用于记录上传的文件块数private static void UploadFileChunkCallback(IAsyncResult ar){Service1 x = (Service1) ar.AsyncState;Console.WriteLine(x.EndUploadFileChunkBytes(ar));if ( --i == 0){Console.WriteLine("异步 up all chunks end");}}public static void Download(string ServerSideFileName,string LocalFileName){Service1 xx = new Service1();byte[] ba = xx.DownloadFileBytes(ServerSideFileName); //Server Side PathFileStream fs = new FileStream(LocalFileName, FileMode.Create); //Client Side Pathfs.Write(ba,0,ba.Length);fs.Close();}}//===========================================================================至此我们通过纯手工的方式完成了任务,之所以不用 VS 就是为了让码子简洁明了!Microshaoft .Night 就是这么平易近人! (PMPMP to MS)通过 Web Sevices 上传文件非常简单,甚至比传统的 http Web 上床还简单!同时较轻松地就实现了文件分块多点异步上传:Server 端代码没啥特殊的!Client 端代码稍微复杂些!关闭本页

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