求asp.net上传图片并同时生成缩略图的代码啊

gety2008 2007-02-24 11:46:11

求asp.net上传图片并同时生成缩略图的代码啊
希望各位发的不仅仅是CS代码，还有HTML的代码.

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yinxiaoyan112 2010-09-14

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用缩略图组件吧 www.wave12.com

阿彪兄 2010-09-13

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这是很久前的代码了

阿彪兄 2010-09-13

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#region 上傳
protected void btnUp_Click(object sender, EventArgs e)
{
if (string.IsNullOrEmpty(imageUpload.PostedFile.FileName))
{
myscript = @"alert('對不起,請選擇要上傳的文件')";
Page.ClientScript.RegisterStartupScript(this.GetType(), "MyScript", myscript, true);
}
string xfilename = "X" + DateTime.Now.ToString("yyyyMMddhhmmss");
string dfilename = "D" + DateTime.Now.ToString("yyyyMMddhhmmss");

string filePath = imageUpload.PostedFile.FileName;
string fileEx = filePath.Substring(filePath.LastIndexOf(".") + 1);
string serverpath1 = Server.MapPath(@"uploadpic\") + xfilename + "." + fileEx;
string serverpath2 = Server.MapPath(@"uploadpic\") + dfilename + "." + fileEx;

//判斷圖片格式
if (fileEx == "jpg" || fileEx == "bmp" || fileEx == "gif" || fileEx == "jpeg")
{

System.Drawing.Image image, newimage;
//保存大圖
imageUpload.SaveAs(serverpath2);
//生成略圖
image = System.Drawing.Image.FromFile(serverpath2);
System.Drawing.Image.GetThumbnailImageAbort callb = null;
newimage = image.GetThumbnailImage(100, 80, callb, new System.IntPtr());
//把略圖保存到指定的虛擬路徑
newimage.Save(serverpath1);
//釋放image對象佔用資源
image.Dispose();
newimage.Dispose();
lblImage.Text = "<img src='uploadpic/" + xfilename + "." + fileEx + "' width='140' height='110'/>";
lblImgurl.Text = xfilename + "." + fileEx;
}
else
{
myscript = @"alert('對不起,圖片格式不正確')";
Page.ClientScript.RegisterStartupScript(this.GetType(), "MyScript", myscript, true);
}
}
#endregion

cl47673250 2010-09-13

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="UploadModifyImg.aspx.cs" Inherits="register_UploadModifyImg" %>



<!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 id="Head1" runat="server">

    <title></title>



    <script type="text/javascript">

        function upload() {

            var button = document.getElementById("Button1");

            button.click();

        }

    </script>



</head>

<body>

    <form id="form1" runat="server">

    <table border="0" cellpadding="0" cellspacing="0">

        <tr>

            <td id="myimg" style="text-align: center; width: 113px;">

                <img alt="图片不能大于512K" id="photoshow" src="../images/photo.gif" width="113" height="129"

                    runat="server" style="padding-top: 0px" />

            </td>

        </tr>

        <tr>

            <td>

                <input id="Photo" type="file" onchange="upload()" runat="server" style="width: 112px" />

            </td>

        </tr>

    </table>

    <span id="photo_span" style="color: Red;"></span>

    <asp:Button ID="Button1" runat="server" Style="display: none" Text="Button" OnClick="Button1_Click" />

    </form>

</body>

</html>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;



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

{

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {



        }

    }



    protected void Button1_Click(object sender, EventArgs e)

    {

        HttpPostedFile file = Request.Files[0];

        if (!isAllowdPictureType(file))

        {

            this.ClientScript.RegisterStartupScript(this.GetType(), string.Empty, "alert('上传文件格式不正确!');", true);

            return;

        }

        else if (file.ContentLength > 500000)

        {

            this.ClientScript.RegisterStartupScript(this.GetType(), string.Empty, "alert('上传文件大小超过500K!');", true);

            return;

        }

        else

        {

            string tempPicNum = Utility.CommonUtility.MakeGuid() + ".jpg";

            Photo.PostedFile.SaveAs(Server.MapPath("temp/" + tempPicNum));

            photoshow.Src = "../register/temp/" + tempPicNum;

            Session["pic"] = file;

        }

    }



    private bool isAllowdPictureType(HttpPostedFile file)

    {

        if (string.IsNullOrEmpty(file.FileName))

        {

            return true;

        }

        string suffix = file.FileName.Substring(file.FileName.LastIndexOf('.') + 1).ToLower();

        string[] allowedSuffix = { "jpg", "bmp", "png", "jpeg", "gif" };

        bool allowed = false;

        foreach (string item in allowedSuffix)

        {

            if (object.Equals(item, suffix))

            {

                allowed = true;

                break;

            }

        }

        return allowed;

    }

}

以上页面为UploadImg.aspx,如果你要做一个无刷新的,你就在另一个页面 <iframe src="UploadImg.aspx" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" tabindex="50" style="width: 113px; " ></iframe>

JiaJiaHappyForever 2010-09-13

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发布之后正确吗你看看有可能路径那里出问题

zhu314746943 2010-09-13

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若要保存到数据库：



cmd = New SqlCommand("INSERT INTO 用户表(原图，缩略图) VALUES('" & imgsavepath.Trim & "','" & imgsltpath.trim & "')", conn)

        cmd.ExecuteNonQuery()

         其他字段自己加

zhu314746943 2010-09-13

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'----------------------上传图片

Imports System

Imports System.Data

Imports System.Configuration

Imports System.Web

Imports System.Web.Security

Imports System.Web.UI

Imports System.Web.UI.WebControls

Imports System.Web.UI.WebControls.WebParts

Imports System.Web.UI.HtmlControls

'--------------------数据库连接

Imports System.Drawing

Imports System.Drawing.Imaging

Imports System.Drawing.Drawing2D

Imports System.Data.SqlClient

Imports System.Math







Dim imgsavepath As String     '----------原图片路径

    Dim imgsltpath As String     '----------缩略图片路径

    Dim sss As String = "**"



‘上传图片并生成缩略图保存到文件夹 ，经过试验 是成功的 不过是VB的代码

Dim image, newimage As System.Drawing.Image

        Dim width, height, newwidth, newheight As Integer

        Dim callb As System.Drawing.Image.GetThumbnailImageAbort

        If imgsavepath <> "" Then System.IO.File.Delete(System.Web.HttpContext.Current.Server.MapPath(imgsavepath))

        Dim uploadname As String = inputfile.Value '获取待上传图片的完整路径，包括文件名 

        Dim imagename As String = "" '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

        '  Dim filetext As String = LCase(Right(Trim(inputfile.Value), 3))

        '  Dim filetext1 As String = LCase(Right(Trim(inputfile.Value), 4))

        If inputfile.Value <> "" Then

            Dim stuff As String = uploadname.Substring(uploadname.LastIndexOf(".") + 1) '获得上传的图片的后缀名

            If stuff = "gif" Or stuff = "jpg" Or stuff = "jpeg" Or stuff = "bmp" Then

                imagename = DateTime.Now.Ticks.ToString + "." + stuff



                inputfile.PostedFile.SaveAs(Server.MapPath("userimages/") + imagename)

                imgsavepath = Server.MapPath("userimages/") + imagename

                '--缩略图

                image = System.Drawing.Image.FromFile(imgsavepath)

                width = image.Width

                height = image.Height

                If width > height Then

                    newwidth = 125

                    newheight = image.Height / image.Width * newwidth

                Else

                    newheight = 104

                    newwidth = image.Width / image.Height * newheight

                End If

                newimage = image.GetThumbnailImage(newwidth, newheight, callb, New System.IntPtr())

                newimage.Save(Server.MapPath("userimages/suolvetu/" + imagename))

                imgsltpath = "userimages/suolvetu/" + imagename

                image.Dispose()

                '-------------------------

                imgtou.ImageUrl = imgsltpath 'Server.MapPath("userimages/suolvetu/" + imagename)





                response.write sss & "成功上传图片"

                Response.Write(imgsavepath)

                Response.Write("<br/>")

                Response.Write(inputfile.Value)

            Else

                response.write  sss & "请选择正确格式的图片"

                Exit Sub

            End If



        Else

            response.write sss & "请选择上传的图片"

            Exit Sub

        End If



<asp:Image ID="imgtou"  Height="104px" Width="100px" runat ="server" ImageAlign ="AbsMiddle" ImageUrl ="~/sysimage/01.gif" />

     <input id="inputfile" type ="file" runat ="server" style="width: 208px" />

    <asp:Button ID="shangch" runat="server" Text="上传" Width="39px" Enabled="False" />

码上有钱了 2007-06-22

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去我的博客看看吧,详尽的回答!

chiyustar 2007-06-22

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学习

greatqn 2007-06-22

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klmy 2007-06-14

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mark

dcan 2007-06-14

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/**/
/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="originalImagePath">源图路径（物理路径）</param>
/// <param name="thumbnailPath">缩略图路径（物理路径）</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
{
System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);

int towidth = width;
int toheight = height;

int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;

switch (mode)
{
case "HW"://指定高宽缩放（可能变形）
break;
case "W"://指定宽，高按比例
toheight = originalImage.Height * width / originalImage.Width;
break;
case "H"://指定高，宽按比例
towidth = originalImage.Width * height / originalImage.Height;
break;
case "Cut"://指定高宽裁减（不变形）
if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
{
oh = originalImage.Height;
ow = originalImage.Height * towidth / toheight;
y = 0;
x = (originalImage.Width - ow) / 2;
}
else
{
ow = originalImage.Width;
oh = originalImage.Width * height / towidth;
x = 0;
y = (originalImage.Height - oh) / 2;
}
break;
default:
break;
}

//新建一个bmp图片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);

//新建一个画板
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);

//设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

//设置高质量,低速度呈现平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

//清空画布并以透明背景色填充
g.Clear(System.Drawing.Color.Transparent);

//在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight),
new System.Drawing.Rectangle(x, y, ow, oh),
System.Drawing.GraphicsUnit.Pixel);

try
{
//以jpg格式保存缩略图
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}

/**/
/// <summary>
/// 在图片上增加文字水印
/// </summary>
/// <param name="Path">原服务器图片路径</param>
/// <param name="Path_sy">生成的带文字水印的图片路径</param>
protected void AddWater(string Path, string Path_sy)
{
string addText = "51aspx.com";
System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
g.DrawImage(image, 0, 0, image.Width, image.Height);
System.Drawing.Font f = new System.Drawing.Font("Verdana", 60);
System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Green);

g.DrawString(addText, f, b, 35, 35);
g.Dispose();

image.Save(Path_sy);
image.Dispose();
}

/**/
/// <summary>
/// 在图片上生成图片水印
/// </summary>
/// <param name="Path">原服务器图片路径</param>
/// <param name="Path_syp">生成的带图片水印的图片路径</param>
/// <param name="Path_sypf">水印图片路径</param>
protected void AddWaterPic(string Path, string Path_syp, string Path_sypf)
{
System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
g.DrawImage(copyImage, new System.Drawing.Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel);
g.Dispose();

image.Save(Path_syp);
image.Dispose();
}

protected void Button2_Click(object sender, EventArgs e)
{
//自动保存远程图片
WebClient client = new WebClient();
//备用Reg:<img.*?src=([\"\'])(http:\/\/.+\.(jpg|gif|bmp|bnp))\1.*?>
Regex reg = new Regex("IMG[^>]*?src\\s*=\\s*(?:\"(?<1>[^\"]*)\"|'(?<1>[^\']*)')", RegexOptions.IgnoreCase);
MatchCollection m = reg.Matches(TextBox1.Text);

foreach (Match math in m)
{
string imgUrl = math.Groups[1].Value;

//在原图片名称前加YYMMDD重名名并上传

Regex regName = new Regex(@"\w+.(?:jpg|gif|bmp|png)", RegexOptions.IgnoreCase);

string strNewImgName = DateTime.Now.ToShortDateString().Replace("-", "") + regName.Match(imgUrl).ToString();

try
{
//保存图片
client.DownloadFile(imgUrl, Server.MapPath("ImgUpload/Auto/" + strNewImgName));

}
catch
{
}
finally
{

}

client.Dispose();
}

Response.Write("<script>alert('远程图片保存成功，保存路径为ImgUpload/auto')</script>");

}
}
}

dcan 2007-06-14

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namespace _51aspxImgUpload
{
/// <summary>
/// 上传图片生成缩略图及水印 (来自：http://www.51aspx.com/CV/ImageUpload)
/// </summary>
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}

protected void Button1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
string fileContentType = FileUpload1.PostedFile.ContentType;
if (fileContentType == "image/bmp" || fileContentType == "image/gif" || fileContentType == "image/pjpeg")
{
string name = FileUpload1.PostedFile.FileName; // 客户端文件路径

FileInfo file = new FileInfo(name);
string fileName = file.Name; // 文件名称
string fileName_s = "x_" + file.Name; // 缩略图文件名称
string fileName_sy = "text_" + file.Name; // 水印图文件名称（文字）
string fileName_syp = "water_" + file.Name; // 水印图文件名称（图片）
string webFilePath = Server.MapPath("ImgUpload/" + fileName); // 服务器端文件路径
string webFilePath_s = Server.MapPath("ImgUpload/" + fileName_s);　　// 服务器端缩略图路径
string webFilePath_sy = Server.MapPath("ImgUpload/" + fileName_sy);　// 服务器端带水印图路径(文字)
string webFilePath_syp = Server.MapPath("ImgUpload/" + fileName_syp);　// 服务器端带水印图路径(图片)
string webFilePath_sypf = Server.MapPath("51aspx.png");　// 服务器端水印图路径(图片)

if (!File.Exists(webFilePath))
{
try
{
FileUpload1.SaveAs(webFilePath); // 使用 SaveAs 方法保存文件
AddWater(webFilePath, webFilePath_sy);
AddWaterPic(webFilePath, webFilePath_syp, webFilePath_sypf);
MakeThumbnail(webFilePath, webFilePath_s, 130, 130, "Cut"); // 生成缩略图方法
Label1.Text = "提示：文件“" + fileName + "”成功上传，并生成“" + fileName_s + "”缩略图，文件类型为：" + FileUpload1.PostedFile.ContentType + "，文件大小为：" + FileUpload1.PostedFile.ContentLength + "B";
}
catch (Exception ex)
{
Label1.Text = "提示：文件上传失败，失败原因：" + ex.Message;
}
}
else
{
Label1.Text = "提示：文件已经存在，请重命名后上传";
}
}
else
{
Label1.Text = "提示：文件类型不符";
}
}
}

dcan 2007-06-14

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;
using System.Net;
using System.Text.RegularExpressions;