ASP.NET实现多文件上传的方法

首先声明一点，本方法上传类大部分参考自laifangsong的文章“单/多文件上传”，我不过是作了小小改动和增加了调用的ASCX控件，原文地址是:http://jiny-z.cnblogs.com/archive/2006/04/17/377184.html来看看前台的upload.ascx文件:

 

<% @ Control Inherits="Upload.myUploadFiles" %> < script  language ="javascript" >   function addFileControl()  {      var str='<input type="file" id="InputFile" name="InputFile" size="64"><br />'      document.getElementById('FileCollection').insertAdjacentHTML("beforeEnd",str)  } </ script > < table  width ="100%"  border ="0"  cellpadding ="0"  cellspacing ="0" >      < tr >          < td  id ="FileCollection" >              < input  type ="file"  id ="InputFile"  name ="InputFile"  size ="64" >< br  />          </ td >      </ tr >      < tr >          < td >          < input  type ="submit"  value ="Submit to Post"   />   < input  type ="button"  value ="增加(File)"  onClick ="addFileControl()" >          </ td >      </ tr >      < tr >          < td >              < asp:Literal  id ="ltrInfo"  runat ="server"   />< br  />          </ td >      </ tr > </ table >

ascx文件的后台代码是：

 

using  System; using  System.Web.UI; using  System.Web.UI.WebControls; using  QS_Web.Upload; namespace  Upload {    public class myUploadFiles : UserControl    {        protected Literal ltrInfo;        private void Page_Load(object sender, EventArgs e)        {            UploadFiles myUploadFiles = new UploadFiles();            myUploadFiles.BoolUseAbsolutePath = false;            myUploadFiles.StrUploadPath = @"up";            myUploadFiles.BoolUseRandFileName = false;            myUploadFiles.BoolCreateDateDir = false;            myUploadFiles.Upload();            ltrInfo.Text = myUploadFiles.GetInfo();        }    }}     

可以看到ascx文件主要作用就是调用UploadFiles类来实现多文件上传，我们再来看看uploadfiles类：

 

public   class  UploadFiles //  单/多文件上传          {                    //上传文件默认目录，例如： UploadFiles，该值在web.config中配置            private string strInitDirectory = Read.GetConfigSetting("UploadDir");            //是否启用绝对路径，该路径一般会存在数据库中。若设为绝对路径，调用不用考虑相对路径问题            private bool boolUseAbsolutePath = false;            //上传路径，例如：上传路径是 Pic，那么所有的图片都会存在 UploadFiles/Pic目录下，为空时全部存在 UploadFiles目录下            private string strUploadPath = String.Empty;            //是否启用随机文件名，随机文件名的格式是：yyyyMMddhhmmss + 3位数的随机数            private bool boolUseRandFileName = true;            //是否自动创建日期目录，若启用，会在上传文件目录下生成 2006/4/17 这3个目录            private bool boolCreateDateDir = true;            //返回提示信息            private string strInfo = String.Empty;            public bool BoolUseAbsolutePath            {                get                {                    return boolUseAbsolutePath;                }                set                {                    boolUseAbsolutePath = value;                }            }            public string StrUploadPath            {                get                {                    return strUploadPath;                }                set                {                    if(boolUseAbsolutePath) //如果启用绝对路径                    {                        strUploadPath = value.ToString().Trim();                        if(!strUploadPath.EndsWith(@"\"))                        {                            strUploadPath += @"\";                        }                    }                    else                    {                        strUploadPath = GetApplicationPath(); //取得虚拟根路径                        if(this.strInitDirectory == "null")//定位到默认目录                        {                            string str = "uploadfiles";                            strUploadPath += str + "/";                        }                        else                        {                            strUploadPath += this.strInitDirectory + "/";                        }                        string strValueExtended = value.ToString().Trim();                        if(strValueExtended != "") //如果输入的上传目录不为空，则将路径定位到该目录                        {                            strUploadPath += value;                            if(!strValueExtended.EndsWith("/"))                            {                                strUploadPath += "/";                            }                        }                    }                }            }            public bool BoolUseRandFileName //是否启用随机文件名            {                get                {                    return boolUseRandFileName;                }                set                {                    boolUseRandFileName = value;                }            }            public bool BoolCreateDateDir //是否自动创建日期目录            {                get                {                    return boolCreateDateDir;                }                set                {                    boolCreateDateDir = value;                }            }            public void Upload()            {                HttpFileCollection hpc = HttpContext.Current.Request.Files; //获取客户端上载的文件集合                            if(hpc != null)                {                    for(int i=0; i<hpc.Count; i++)                    {                        HttpPostedFile file = hpc[i];                        int intFileContentLength = file.ContentLength;//判断文件大小，返回的是字节                        if(intFileContentLength < 1) //空文件处理                        {                            strInfo += "<br />文件为空文件，请查正再上传！";                            return;                        }                        int intAllowMaxSize;                        try                        {                            intAllowMaxSize = Convert.ToInt32(Read.GetConfigSetting("UploadMaxSize"));                        }                        catch                        {                            intAllowMaxSize = 2000;                        }                        if(intFileContentLength > intAllowMaxSize * 1024)                        {                            strInfo = "<br />最大上传的文件只允许<font color=red> " + intAllowMaxSize.ToString() + " </font>K";                            return;                        }                        string strFileName = Path.GetFileName(file.FileName);                        string strFileContentType = Path.GetExtension(strFileName).Remove(0, 1); //返回指定的路径字符串的扩展名                        string strAllowTypes = Read.GetConfigSetting("UploadTypes");                        if(strAllowTypes != "null")                        {                            //判断类型是否在允许类型列表中，这样写，允许列表必须用"|"分隔允许类型                            if(("|"+strAllowTypes.ToLower()+"|").IndexOf("|"+strFileContentType.ToLower()+"|") == -1)                             {                                strInfo += "<br />只允许上传的文件格式有：<font color=red> " + strAllowTypes + " </font>";                                return;                            }                        }                        //随机文件名                        if(boolUseRandFileName)                        {                            strFileName = DateTime.Now.ToString("yyyyMMddhhmmss") + (new Random()).Next(100, 1000).ToString() + "." + strFileContentType;                        }                        string strFilePath,strAddPath;                        if(boolUseAbsolutePath)                        {                            if(!Directory.Exists(strUploadPath)) //确定目录是否存在，如果否，则创建目录                            {                                Directory.CreateDirectory(strUploadPath);                            }                            strAddPath = strUploadPath;                        }                        else                        {                            if(strUploadPath == String.Empty)                            {                                if(this.strInitDirectory == "null")//定位到默认目录                                {                                    string str = "uploadfiles";                                    strUploadPath += str + "/";                                }                                else                                {                                    strUploadPath += this.strInitDirectory + "/";                                }                            }                            strAddPath = HttpContext.Current.Server.MapPath(strUploadPath); //返回与指定虚拟路径相对应的物理文件路径                            if(!Directory.Exists(strAddPath)) //确定目录是否存在，如果否，则创建目录                            {                                Directory.CreateDirectory(strAddPath);                            }                        }                        if(boolCreateDateDir)//如果创建日期目录，则创建                        {                            strAddPath += DateTime.Today.Year.ToString() + @"\";                            if(!Directory.Exists(strAddPath))                            {                                Directory.CreateDirectory(strAddPath);                            }                            strAddPath += DateTime.Today.Month.ToString().PadLeft(2, '0') + @"\";                            if(!Directory.Exists(strAddPath))                            {                                Directory.CreateDirectory(strAddPath);                            }                            strAddPath += DateTime.Today.Day.ToString().PadLeft(2, '0') + @"\";                            if(!Directory.Exists(strAddPath))                            {                                Directory.CreateDirectory(strAddPath);                            }                        }                        strFilePath = strAddPath + strFileName;                        file.SaveAs((strFilePath));                                                string strLocalPath = HttpContext.Current.Server.MapPath(null);                        string strUrl = strFilePath.Replace(strLocalPath,"");                        strInfo += "<br />文件<font color=red> "+ strFileName + " </font>上传成功！";                        //strInfo += "<br />地址：<font color=red> " + strFilePath +" </font>";                        strInfo += "<br />文件地址：<font color=red> " + strUrl +" </font>";                    }                }            }            public string GetInfo()            {                return strInfo;            }            private string GetApplicationPath() //取得虚拟根路径            {                string strAppPath = HttpContext.Current.Request.ApplicationPath;  //获取应用程序的虚拟应用程序根路径                if(!strAppPath.EndsWith("/"))                {                    strAppPath += "/";                 }                return strAppPath;            }            }

对原来代码的修改主要修改的是文件存放位置的定位上，原来的代码在测试的时候出现一些细微的错误，我改正了，并按照我自己的意愿作了一些修改，现在使用该类主要要注意的是：

代码会在Web.config文件中搜索名为"UploadDir"的设置，当上传设定为非绝对路径时候，该设置设定上传路径的上传目录，所有文件及程序中设置的目录路径均在该设置设定的文件夹下，如果该设置为空，则默认目录是根目录下的uploadfiles目录；代码会在Web.config文件中搜索名为"UploadMaxSize"的设置，该设置设定上传文件的大小，单位为K如果该设置为空，则默认是2000K；代码会在Web.config文件中搜索名为"UploadTypes"的设置，该设置设定上传文件的类型，格式是"jpg|gif|bmp"，如果该设置为空，则默认可以上传所有类型文件。一定要设置上传文件类型，否则有极大隐患！

感谢laifangsong给我们带来了如此精彩的代码！

最后批评或建议请留言或直接Email给我：kenblove#gmail.com（记得将#换@哦）

转载于:https://www.cnblogs.com/KenBlove/articles/463299.html

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