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前台UpPicture.aspx代码：
 <%@ Page language="c#" Codebehind="UpPicture.aspx.cs" AutoEventWireup="false" Inherits="UpPic.UpPicture" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ><HTML> <HEAD> <title>UpPicture</title> <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1"> <meta name="CODE_LANGUAGE" Content="C#"> <meta name="vs_defaultClientScript" content="JavaScript"> <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="Form1" method="post" runat="server"> <INPUT id="File1" style="Z-INDEX: 101; LEFT: 24px; WIDTH: 440px; POSITION: absolute; TOP: 32px; HEIGHT: 22px" type="file" size="54" name="File1" runat="server"> <asp:Button id="btnUpPic" style="Z-INDEX: 102; LEFT: 472px; POSITION: absolute; TOP: 32px" runat="server" Text="上传图片"></asp:Button> <asp:Label id="Label1" style="Z-INDEX: 103; LEFT: 24px; POSITION: absolute; TOP: 64px" runat="server" Width="520px"></asp:Label> <asp:Image id="showSmallPic" style="Z-INDEX: 104; LEFT: 32px; POSITION: absolute; TOP: 104px" runat="server"></asp:Image> </form> </body></HTML>后台UpPicture.aspx.cs代码： using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;using System.Data.SqlClient;using System.IO;namespace UpPic{ /**//// <summary> /// UpPicture 的摘要说明。 /// </summary> public class UpPicture : System.Web.UI.Page { protected System.Web.UI.HtmlControls.HtmlInputFile File1; protected System.Web.UI.WebControls.Label Label1; protected System.Web.UI.WebControls.Image showSmallPic; protected System.Web.UI.WebControls.Button btnUpPic; private void Page_Load(object sender, System.EventArgs e) { // 在此处放置用户代码以初始化页面 } Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码 override protected void OnInit(EventArgs e) { // // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。 // InitializeComponent(); base.OnInit(e); } /**//// <summary> /// 设计器支持所需的方法 - 不要使用代码编辑器修改 /// 此方法的内容。 /// </summary> private void InitializeComponent() { this.btnUpPic.Click += new System.EventHandler(this.btnUpPic_Click); this.Load += new System.EventHandler(this.Page_Load); } #endregion //提供一个回调方法,用于确定Image对象在执行生成缩略图操作时何时提前取消执行 //如果此方法确定 GetThumbnailImage 方法应提前停止执行，则返回 true；否则返回 false System.Drawing.Image.GetThumbnailImageAbort callb = null; //定义image类的对象 System.Drawing.Image image,smallImage,shuiyinImg,FlagImage; private void btnUpPic_Click(object sender, System.EventArgs e) { if(this.File1.PostedFile.FileName!="") { //先取得上传的总路径 string imagePath=this.File1.PostedFile.FileName; //取得图片类型 string imageType=Path.GetExtension(imagePath).ToUpper(); //取得图片名称 string imageName=imagePath.Substring(imagePath.LastIndexOf("\\")+1); imageName=System.DateTime.Now.ToString("yyyyMMddhhmmss")+"_"+imageName; //判断上传图片类型 if(imageType==".JPG"||imageType==".BMP"||imageType==".JPEG") { //保存原图 string ImgPath=Server.MapPath("upFile"+"\\"+imageName); this.File1.PostedFile.SaveAs(ImgPath); //为上传的图片建立引用 image=System.Drawing.Image.FromFile(ImgPath); /**//*************加水印开始*********************************************/ shuiyinImg=System.Drawing.Image.FromFile(Server.MapPath(".")+"/Flag200_100.png"); Graphics g = Graphics.FromImage(image); g.DrawImage(shuiyinImg, new Rectangle(image.Width-shuiyinImg.Width, image.Height-shuiyinImg.Height, shuiyinImg.Width, shuiyinImg.Height), 0, 0, shuiyinImg.Width, shuiyinImg.Height, GraphicsUnit.Pixel); g.Dispose(); string path1=Server.MapPath("upFile"+"\\Flag_"+imageName); image.Save(path1); image.Dispose(); /**//************加水印的过程结束*********************************************/ FlagImage=System.Drawing.Image.FromFile(path1); //生成缩略图 smallImage=FlagImage.GetThumbnailImage(130,100,callb,new System.IntPtr()); //保存加水印后的缩略图 smallImage.Save(Server.MapPath("upFile")+"\\small"+imageName); //释放对象占用的资源 FlagImage.Dispose(); smallImage.Dispose(); //删除原图，删除加水印后的原图 if(File.Exists(ImgPath)) { File.Delete(ImgPath); } if(File.Exists(path1)) { File.Delete(path1); } //显示缩略图 showSmallPic.ImageUrl = "upFile/"+"small"+imageName; Response.Write("上传成功!"); } else { this.Label1.Text="对不起！请您选择jpg或者gif格式的图片！"; return; } } else { this.Label1.Text="请选择图片！"; return; } } }} |
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来自： boxls > 《asp.net小实例》
