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）