方法類：
復制代碼 代碼如下:
upFileClass.cs
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;
/// <summary>
/// upFileClass 的摘要說明
/// </summary>
public class upFileClass
{
public upFileClass()
{
//
// TODO: 在此處添加構造函數邏輯
//
}
/// <summary>
/// 生成縮略圖
/// </summary>
/// <param name="originalImagePath">源圖路徑（物理路徑）</param>
/// <param name="thumbnailPath">縮略圖路徑（物理路徑）</param>
/// <param name="width">縮略圖寬度</param>
/// <param name="height">縮略圖高度</param>
/// <param name="mode">生成縮略圖的方式</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"://指定高寬縮放（可能變形）
break;
case "W"://指定寬，高按比例
toheight = originalImage.Height * width / originalImage.Width;
break;
case "H"://指定高，寬按比例
towidth = originalImage.Width * height / originalImage.Height;
break;
case "Cut"://指定高寬裁減（不變形）
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;
}
//新建一個bmp圖片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
//新建一個畫板
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
//設置高質量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//設置高質量,低速度呈現平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空畫布並以透明背景色填充
g.Clear(System.Drawing.Color.Transparent);
//在指定位置並且按指定大小繪制原圖片的指定部分
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格式保存縮略圖
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
/// <summary>
/// 在圖片上增加文字水印
/// </summary>
/// <param name="Path">原服務器圖片路徑</param>
/// <param name="Path_sy">生成的帶文字水印的圖片路徑</param>
public static void AddShuiYinWord(string Path, string Path_sy)
{
string addText = "愛智旮旯";
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", 16);
System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Blue);
g.DrawString(addText, f, b, 15, 15);
g.Dispose();
image.Save(Path_sy);
image.Dispose();
}
/// <summary>
/// 在圖片上生成圖片水印
/// </summary>
/// <param name="Path">原服務器圖片路徑</param>
/// <param name="Path_syp">生成的帶圖片水印的圖片路徑</param>
/// <param name="Path_sypf">水印圖片路徑</param>
public static void AddShuiYinPic(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();
}
}
Default.aspx代碼：
復制代碼 代碼如下:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_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>asp.net 上傳圖片並作處理 水印 縮略圖</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="FileUpload1" runat="server" BorderColor="Gray" BorderWidth="1px" />
<asp:Button ID="Button1" runat="server" onClick="Button1_Click" Text="上傳" BorderColor="Gray" BorderWidth="1px" Width="70px" /><br />
<asp:Label ID="Label1" runat="server"></asp:Label>
</div>
</form>
</body>
</html>
Default.aspx.cs代碼：
復制代碼 代碼如下:
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 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; // 客戶端文件路徑
FileInfo file = new FileInfo(name);
string fileName = file.Name; // 文件名稱
string fileName_s = "s_" + file.Name; // 縮略圖文件名稱
string fileName_sy = "sy_" + file.Name; // 水印圖文件名稱（文字）
string fileName_syp = "syp_" + file.Name; // 水印圖文件名稱（圖片）
//以下路徑可以根據情況進行修改
string webFilePath = Server.MapPath("file/" + fileName); // 服務器端文件路徑
string webFilePath_s = Server.MapPath("file/" + fileName_s); // 服務器端縮略圖路徑
string webFilePath_sy = Server.MapPath("file/" + fileName_sy); // 服務器端帶水印圖路徑(文字)
string webFilePath_syp = Server.MapPath("file/" + fileName_syp); // 服務器端帶水印圖路徑(圖片)
//以下為水印圖片的路徑一定要先准備一張水印圖片！
string webFilePath_sypf = Server.MapPath("file/shuiyin.jpg"); // 服務器端水印圖路徑(圖片)
if (!File.Exists(webFilePath))
{
try
{
FileUpload1.SaveAs(webFilePath); // 使用 SaveAs 方法保存文件
upFileClass.AddShuiYinWord(webFilePath, webFilePath_sy);
upFileClass.AddShuiYinPic(webFilePath, webFilePath_syp, webFilePath_sypf);
upFileClass.MakeThumbnail(webFilePath, webFilePath_s, 130, 130, "Cut"); // 生成縮略圖方法
Label1.Text = "提示：文件“" + fileName + "”成功上傳，並生成“" + fileName_s + "”縮略圖，文件類型為：" + FileUpload1.PostedFile.ContentType + "，文件大小為：" + FileUpload1.PostedFile.ContentLength + "B";
}
catch (Exception ex)
{
Label1.Text = "提示：文件上傳失敗，失敗原因：" + ex.Message;
}
}
else
{
Label1.Text = "提示：文件已經存在，請重命名後上傳";
}
}
else
{
Label1.Text = "提示：文件類型不符";
}
}
}
}
