asp.net 上传图片

任意读取文件

 

 

 static void Main(string[] args)
        {
            //打开一个已有文件
            FileStream inStream = new FileStream("29副本.jpg", FileMode.Open);
            //新建一个目标文件,如果文件已存在会抛错
            FileStream outStream = new FileStream("副本-29副本.jpg", FileMode.CreateNew);
            Int32 i = 0;
            //循环inStream,将内容写进outStream
            while (true)
            {
                i = inStream.ReadByte();
                if (i != -1)
                {
                    outStream.WriteByte((Byte)i);
                }
                else
                {
                    break;
                }
            }
            //关闭文件
            outStream.Close();
            inStream.Close();
        }

 

 

 

 

火狐浏览器,可能上传失败

解决方法:(SharePoint)

 

 /// <summary>
        /// 上传图片
        /// </summary>
        /// <param name="oWeb">当前站点</param>
        /// <param name="documentLibraryName">图片存放的列表</param>
        /// <param name="replaceExistingFiles">是否替换已存在的文件</param>
        /// <param name="url">图片路径</param>
        /// <returns></returns>
        private void UploadFile(SPWeb oWeb, SPDocumentLibrary myLibrary, bool replaceExistingFiles, string url)
        {
            String fileToUpload = this.fileUploadPIC.PostedFile.FileName;
            try
            {
               
                //if (!System.IO.File.Exists(fileToUpload))//火狐只能获取到文件名,没有全路径
                //    return ;
                string extend = System.IO.Path.GetExtension(fileToUpload).ToLower();
                if(extend != ".jpg" && extend != ".gif" && extend != ".jpeg" && extend != ".png")
                {
                    return;
                }
                byte[] bt= this.fileUploadPIC.FileBytes;
                //String fileName = System.IO.Path.GetFileName(fileToUpload);

                //FileStream fileStream = File.OpenRead(fileToUpload);
                SPFile spfile = myLibrary.RootFolder.Files.Add(url, bt, replaceExistingFiles);
                spfile.Update();
                myLibrary.Update();
               
            }
            catch(Exception ex)
            {
               
            }
           
        }

       

     


    }

 

 

 

1 使用标准HTML来进行图片上传

前台代码:

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<body> 
    <form id="form1" runat="server"> 
    <div> 
        <table> 
            <tr> 
                <td colspan="2" style="height: 21px" > 
                    使用标准HTML来进行图片上传</td> 
            </tr> 
            <tr> 
                <td style="width: 400px"> 
                    <input id="InputFile" style="width: 399px" type="file" runat="server" /></td> 
                <td style="width: 80px"> 
                    <asp:Button ID="UploadButton" runat="server" Text="上传图片" OnClick="UploadButton_Click" /></td> 
            </tr> 
            <tr> 
                <td colspan="2" > 
                    <asp:Label ID="Lb_Info" runat="server" ForeColor="Red"></asp:Label></td>                 
            </tr> 
        </table>     
    </div> 
    </form> 
</body>
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后台代码:

 

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using System; 
using System.Data; 
using System.Configuration; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 

public partial class _Default : System.Web.UI.Page  

    protected void Page_Load(object sender, EventArgs e) 
    { 

    } 
    protected void UploadButton_Click(object sender, EventArgs e) 
    { 
        string uploadName = InputFile.Value;//获取待上传图片的完整路径,包括文件名 
        //string uploadName = InputFile.PostedFile.FileName; 
        string pictureName = "";//上传后的图片名,以当前时间为文件名,确保文件名没有重复 
        if (InputFile.Value != ""
        { 
            int idx = uploadName.LastIndexOf("."); 
            string suffix = uploadName.Substring(idx);//获得上传的图片的后缀名 
            pictureName = DateTime.Now.Ticks.ToString() + suffix; 
        } 
        try 
        { 
            if (uploadName != ""
            { 
                string path = Server.MapPath("~/images/"); 
                InputFile.PostedFile.SaveAs(path + pictureName); 
            } 
        } 
        catch (Exception ex) 
        { 
            Response.Write(ex); 
        } 
    } 
}

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2 单文件上传

        这是最基本的文件上传,在asp.net1.x中没有这个FileUpload控件,只有html的上传控件,那时候要把html控件转化为服务器控件, 很不好用。其实所有文件上传的美丽效果都是从这个FileUpload控件衍生,第一个例子虽然简单却是根本。

前台代码:

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<body> 
    <form id="form1" runat="server"> 
    <div> 
        <table style="width: 90%"> 
            <tr> 
                <td style="width: 159px" colspan=2> 
                    <strong><span style="font-size: 10pt">最简单的单文件上传</span></strong></td> 
            </tr> 
            <tr> 
                <td style="width: 600px"> 
                    <asp:FileUpload ID="FileUpload1" runat="server" Width="600px" /></td> 
                <td align=left> 
                    <asp:Button ID="FileUpload_Button" runat="server" Text="上传图片" OnClick="FileUpload_Button_Click" /></td> 
            </tr> 
            <tr> 
                <td colspan=2> 
                    <asp:Label ID="Upload_info" runat="server" ForeColor="Red" Width="767px"></asp:Label></td> 
            </tr> 
        </table>     
    </div> 
    </form> 
</body>
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后台代码:

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using System; 
using System.Data; 
using System.Configuration; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 

public partial class _Default : System.Web.UI.Page  

    protected void Page_Load(object sender, EventArgs e) 
    { 

    } 
    protected void FileUpload_Button_Click(object sender, EventArgs e) 
    { 
        try 
        { 
            if (FileUpload1.PostedFile.FileName == ""
            //if (FileUpload1.FileName == "") 
            //if (!FileUpload1.HasFile)     //获取一个值,该值指示 System.Web.UI.WebControls.FileUpload 控件是否包含文件。包含文件,则为 true;否则为 false。 
            { 
                this.Upload_info.Text = "请选择上传文件!"
            } 
            else 
            { 
                string filepath = FileUpload1.PostedFile.FileName;  //得到的是文件的完整路径,包括文件名,如:C:\Documents and Settings\Administrator\My Documents\My Pictures\20022775_m.jpg 
                //string filepath = FileUpload1.FileName;               //得到上传的文件名20022775_m.jpg 
                string filename = filepath.Substring(filepath.LastIndexOf("\\"+ 1);//20022775_m.jpg 
                string serverpath = Server.MapPath("~/images/"+ filename;//取得文件在服务器上保存的位置C:\Inetpub\wwwroot\WebSite1\images\20022775_m.jpg 
                FileUpload1.PostedFile.SaveAs(serverpath);//将上传的文件另存为 
                this.Upload_info.Text = "上传成功!"
            } 
        } 
        catch (Exception ex) 
        { 
            this.Upload_info.Text = "上传发生错误!原因是:" + ex.ToString(); 
        } 
    } 
}

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 3 多文件上传

前台代码:

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<body> 
    <form id="form1" runat="server"> 
    <div> 
    <table style="width: 343px"> 
            <tr> 
                <td style="width: 100px"> 
                    多文件上传</td> 
                <td style="width: 100px"> 
                </td> 
            </tr> 
            <tr> 
                <td style="width: 100px"> 
                    <asp:FileUpload ID="FileUpload1" runat="server" Width="475px" /> 
                    </td> 
                <td style="width: 100px"> 
                    </td> 
            </tr> 
            <tr> 
                <td style="width: 100px"> 
                    <asp:FileUpload ID="FileUpload2" runat="server" Width="475px" /></td> 
                <td style="width: 100px"> 
                </td> 
            </tr> 
            <tr> 
                <td style="width: 100px"> 
                    <asp:FileUpload ID="FileUpload3" runat="server" Width="475px" /></td> 
                <td style="width: 100px"> 
                </td> 
            </tr> 
            <tr> 
                <td style="width: 100px"> 
                    <asp:Button ID="bt_upload" runat="server" OnClick="bt_upload_Click" Text="一起上传" /> 
                    <asp:Label ID="lb_info" runat="server" ForeColor="Red" Width="448px"></asp:Label></td>                 <td style="width: 100px">                 </td>             </tr>         </table>     </div>     </form> </body>

 后台代码:

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using System; 
using System.Data; 
using System.Configuration; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 

public partial class _Default : System.Web.UI.Page  

    protected void Page_Load(object sender, EventArgs e) 
    { 

    } 
    protected void bt_upload_Click(object sender, EventArgs e) 
    { 
        if (FileUpload1.PostedFile.FileName == "" && FileUpload2.PostedFile.FileName == "" && FileUpload3.PostedFile.FileName == ""
        { 
            this.lb_info.Text = "请选择文件!"
        } 
        else 
        { 
            HttpFileCollection myfiles = Request.Files; 
            for (int i = 0; i < myfiles.Count; i++
            { 
                HttpPostedFile mypost = myfiles[i]; 
                try 
                { 
                    if (mypost.ContentLength > 0
                    { 
                        string filepath = mypost.FileName;//C:\Documents and Settings\Administrator\My Documents\My Pictures\20022775_m.jpg 
                        string filename = filepath.Substring(filepath.LastIndexOf("\\"+ 1);//20022775_m.jpg 
                        string serverpath = Server.MapPath("~/images/"+ filename;//C:\Inetpub\wwwroot\WebSite2\images\20022775_m.jpg 
                        mypost.SaveAs(serverpath); 
                        this.lb_info.Text = "上传成功!"
                    } 
                } 
                catch (Exception ex) 
                { 
                    this.lb_info.Text = "上传发生错误!原因:" + ex.Message.ToString(); 
                } 
            } 
        } 
    } 
}

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4 客户端检查上传文件类型(以上传图片为例)

 

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@ Page Language""=true  CodeFile""=_Default  

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 

<html xmlns="http://www.w3.org/1999/xhtml" > 
<head runat="server"> 
    <title>客户端检查上传文件类型</title> 
    <script language="javascript">functionvar=""var=""var=if!=.jpg&&!=.gif
        { 
            alert(您上传的文件类型为++,图片必须为.jpg,.gif类型); 
             
        } 
         
        { 
             
        }         
    } 
    </script> 
</head> 
<body> 
    <form id="form1" runat="server"> 
    <div> 
        <table> 
            <tr> 
                <td colspan="2"> 
                    客户端检查上传文件类型</td>                 
            </tr> 
            <tr> 
                <td style="width: 444px"> 
                    <asp:FileUpload ID="FileUpload1" runat="server" Width="432px" /></td> 
                <td style="width: 80px"> 
                    <asp:Button ID="bt_upload" runat="server" Text="上传图片" OnClick="bt_upload_Click" OnClientClick="return Check_FileType()" /></td> 
            </tr> 
            <tr> 
                <td colspan="2" style="height: 21px"> 
                    <asp:Label ID="lb_info" runat="server" ForeColor="Red" Width="515px"></asp:Label></td>                 
            </tr>         </table>         </div>     </form> </body> </html>


注意:点击上传时先触发客户端事件OnClientClick="return Check_FileType()"

 

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using System; 
using System.Data; 
using System.Configuration; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 

public partial class _Default : System.Web.UI.Page  

    protected void Page_Load(object sender, EventArgs e) 
    { 

    } 

    protected void bt_upload_Click(object sender, EventArgs e) 
    { 
        try 
        { 
            if (FileUpload1.PostedFile.FileName == ""
            { 
                this.lb_info.Text = "请选择文件!"
            } 
            else 
            { 
                string filepath = FileUpload1.PostedFile.FileName; 
                //if (!IsAllowedExtension(FileUpload1)) 
                //
                //    this.lb_info.Text = "上传文件格式不正确!"; 
                //
                if (IsAllowedExtension(FileUpload1) == true
                { 
                    string filename = filepath.Substring(filepath.LastIndexOf("\\"+ 1); 
                    string serverpath = Server.MapPath("~/images/"+ filename; 
                    FileUpload1.PostedFile.SaveAs(serverpath); 
                    this.lb_info.Text = "上传成功!"
                } 
                else 
                { 
                    this.lb_info.Text = "请上传图片!"
                } 
            } 
        } 
        catch (Exception ex) 
        { 
            this.lb_info.Text = "上传发生错误!原因:" + ex.ToString(); 
        } 
    } 
    private static bool IsAllowedExtension(FileUpload upfile) 
    { 
        string strOldFilePath = ""
        string strExtension=""
        string[] arrExtension =".gif"".jpg"".bmp"".png" }; 
        if (upfile.PostedFile.FileName != string.Empty) 
        { 
            strOldFilePath = upfile.PostedFile.FileName;//获得文件的完整路径名 
            strExtension = strOldFilePath.Substring(strOldFilePath.LastIndexOf("."));//获得文件的扩展名,如:.jpg 
            for (int i = 0; i < arrExtension.Length; i++
            { 
                if (strExtension.Equals(arrExtension[i]))                 {                     return true;                 }             }         }         return false;     } }


注意:若去掉客户端的脚本和客户端事件OnClientClick="return Check_FileType()",在后台代码
改为:

if (!IsAllowedExtension(FileUpload1)) 
                { 
                    this.lb_info.Text = "上传文件格式不正确!"
                } 
else if (IsAllowedExtension(FileUpload1) == true)


即变成服务器端检查上传文件类型。

5  服务器端检查上传文件的类型(文件内部真正的格式)

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<body> 
    <form id="form1" runat="server"> 
    <div> 
        <table> 
            <tr> 
                <td colspan="2"> 
                    服务器检查上传文件类型</td>                 
            </tr> 
            <tr> 
                <td style="width: 444px"> 
                    <asp:FileUpload ID="FileUpload1" runat="server" Width="432px" /></td> 
                <td style="width: 80px"> 
                    <asp:Button ID="bt_upload" runat="server" Text="上传图片" OnClick="bt_upload_Click" /></td> 
            </tr> 
            <tr> 
                <td colspan="2" style="height: 21px"> 
                    <asp:Label ID="lb_info" runat="server" ForeColor="Red" Width="515px"></asp:Label></td>                 
            </tr> 
        </table>     
    </div> 
    </form> 
</body>
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后台代码:

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using System; 
using System.Data; 
using System.Configuration; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 
using System.IO; 

public partial class _Default : System.Web.UI.Page  

    protected void Page_Load(object sender, EventArgs e) 
    { 

    } 
    protected void bt_upload_Click(object sender, EventArgs e) 
    { 
        try 
        { 
            if (FileUpload1.PostedFile.FileName == ""
            { 
                this.lb_info.Text = "请选择文件!"
            } 
            else 
            { 
                string filepath = FileUpload1.PostedFile.FileName; 
                if (IsAllowedExtension(FileUpload1) == true
                { 
                    string filename = filepath.Substring(filepath.LastIndexOf("\\"+ 1); 
                    string serverpath = Server.MapPath("images/"+ filename; 
                    FileUpload1.PostedFile.SaveAs(serverpath); 
                    this.lb_info.Text = "上传成功!"
                } 
                else 
                { 
                    this.lb_info.Text = "请上传图片"
                } 
            } 
        } 
        catch (Exception error) 
        { 
            this.lb_info.Text = "上传发生错误!原因:" + error.ToString(); 
        } 
    } 
    private static bool IsAllowedExtension(FileUpload upfile) 
    { 
        FileStream fs = new FileStream(upfile.PostedFile.FileName, FileMode.Open, FileAccess.Read); 
        BinaryReader r = new BinaryReader(fs); 
        string fileclass = ""
        byte buffer; 
        try 
        { 
            buffer = r.ReadByte(); 
            fileclass = buffer.ToString(); 
            buffer = r.ReadByte(); 
            fileclass += buffer.ToString(); 
        } 
        catch 
        {  
             
        } 
        r.Close(); 
        fs.Close(); 
        if (fileclass == "255216" || fileclass == "7173"||fileclass=="6677"||fileclass=="13780")//说明255216是jpg;7173是gif;6677是BMP,13780是PNG;7790是exe,8297是rar 
        { 
            return true
        } 
        else 
        { 
            return false
        } 
    } 
}

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转自: http://blog.csdn.net/qing0991/archive/2008/09/06/2890654.aspx

 

posted on 2015-04-29 11:59  !无名之辈  阅读(217)  评论(0)    收藏  举报