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主頁 > 知識庫 > asp.net上傳圖片并作處理水印與縮略圖的實例代碼

asp.net上傳圖片并作處理水印與縮略圖的實例代碼

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 上傳圖片并作處理水印縮略圖/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準備一張水印圖片！
                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，并生成“" + 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，請重命名后上傳";
                }
            }
            else
            {
                Label1.Text = "提示：文件類型不符";
            }