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asp.net上傳圖片並作處理浮水印與縮圖的執行個體代碼

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方法類：

複製代碼 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: 在此處添加建構函式邏輯
//
}

/// <summary>
/// 產生縮圖
/// </summary>
/// <param name="originalImagePath">源圖路徑（實體路徑）</param>
/// <param name="thumbnailPath">縮圖路徑（實體路徑）</param>
/// <param name="width">縮圖寬度</param>
/// <param name="height">縮圖高度</param>
/// <param name="mode">產生縮圖的方式</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;
}

//建立一個bmp圖片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);

//建立一個畫板
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);

//設定高品質插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

//設定高品質,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製原圖片的指定部分
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格式儲存縮圖
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}

/// <summary>
/// 在圖片上增加文字浮水印
/// </summary>
/// <param name="Path">原伺服器圖片路徑</param>
/// <param name="Path_sy">產生的帶文字浮水印的圖片路徑</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>
/// 在圖片上產生圖片浮水印
/// </summary>
/// <param name="Path">原伺服器圖片路徑</param>
/// <param name="Path_syp">產生的帶圖片浮水印的圖片路徑</param>
/// <param name="Path_sypf">浮水印圖片路徑</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：複製代碼 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 浮水印 縮圖</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：複製代碼 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; // 用戶端檔案路徑

FileInfo file = new FileInfo(name);
string fileName = file.Name; // 檔案名稱
string fileName_s = "s_" + file.Name; // 縮圖檔案名稱
string fileName_sy = "sy_" + file.Name; // 浮水印圖檔案名稱（文字）
string fileName_syp = "syp_" + file.Name; // 浮水印圖檔案名稱（圖片）
//以下路徑可以根據情況進行修改
string webFilePath = Server.MapPath("file/" + fileName); // 伺服器端檔案路徑
string webFilePath_s = Server.MapPath("file/" + fileName_s);　　// 伺服器端縮圖路徑
string webFilePath_sy = Server.MapPath("file/" + fileName_sy);　// 伺服器端帶浮水印圖路徑(文字)
string webFilePath_syp = Server.MapPath("file/" + fileName_syp);　// 伺服器端帶浮水印圖路徑(圖片)
//以下為浮水印圖片的路徑一定要先準備一張浮水印圖片！
string webFilePath_sypf = Server.MapPath("file/shuiyin.jpg");　// 伺服器端浮水印圖路徑(圖片)

if (!File.Exists(webFilePath))
{
try
{
FileUpload1.SaveAs(webFilePath); // 使用 SaveAs 方法儲存檔案
upFileClass.AddShuiYinWord(webFilePath, webFilePath_sy);
upFileClass.AddShuiYinPic(webFilePath, webFilePath_syp, webFilePath_sypf);
upFileClass.MakeThumbnail(webFilePath, webFilePath_s, 130, 130, "Cut"); // 產生縮圖方法
Label1.Text = "提示：檔案“" + fileName + "”成功上傳，並產生“" + fileName_s + "”縮圖，檔案類型為：" + FileUpload1.PostedFile.ContentType + "，檔案大小為：" + FileUpload1.PostedFile.ContentLength + "B";
}
catch (Exception ex)
{
Label1.Text = "提示：檔案上傳失敗，失敗原因：" + ex.Message;
}
}
else
{
Label1.Text = "提示：檔案已經存在，請重新命名後上傳";
}
}
else
{
Label1.Text = "提示：檔案類型不符";
}

}
}

}

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