加水印

最新推荐文章于 2025-09-02 00:15:00 发布

转载最新推荐文章于 2025-09-02 00:15:00 发布 · 449 阅读

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本文介绍了一个 ASP.NET 应用程序中如何处理文件上传并为上传的图片添加文字和图片水印的方法。具体包括使用 HttpPostedFile 对象获取文件、检查文件类型、读取文件流以及利用 Graphics 对象进行水印添加等关键步骤。

/// <summary>
    /// _02UpLoad 的摘要说明
    /// </summary>
    public class _02UpLoad : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/html";
          //HttpPostedFile file=context.Request.Files[0];
          //if (file.ContentLength > 0)
          //{
          //    string strName = System.IO.Path.GetFileName(file.FileName);
          //    file.SaveAs(context.Server.MapPath("/UpLoad/"+strName));

//}

//======================================加文字水印=====================================================

StringBuilder sbMsg = new StringBuilder();

            for (int i = 0; i < context.Request.Files.Count; i++)
            {
                HttpPostedFile file = context.Request.Files[i];
                if (file.ContentType.Contains("image/"))
                {
                    if (file.ContentLength>0)
                    {
                    using (Image img=Image.FromStream(file.InputStream))
                    {
                        using ( Graphics g=Graphics.FromImage(img))
                        {
                            g.DrawString("传奇",new Font("微软雅黑",16),Brushes.Red,0,0);
                        }
                        string strName = System.IO.Path.GetFileName(file.FileName);
                        string PhyPath = context.Server.MapPath("/UpLoad/" + strName);
                        img.Save(PhyPath);
                        sbMsg.AppendLine(strName+"<br/>");
                    }
                    }
                }
            }
            context.Response.Write("上传成功！<br/>" + sbMsg.ToString());
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }

============================================加图片水印======================================================

StringBuilder sbMsg = new StringBuilder();

            for (int i = 0; i < context.Request.Files.Count; i++)
            {
                HttpPostedFile file = context.Request.Files[i];
                if (file.ContentType.Contains("image/"))
                {
                    if (file.ContentLength>0)
                    {
                    using (Image img=Image.FromStream(file.InputStream))
                    {
                        using (Image imgWater = Image.FromFile(context.Server.MapPath("/UpLoad/adidas.jpg")))
                        {
                            using (Graphics g = Graphics.FromImage(img))
                            {
                                                            g.DrawImage(imgWater,0,0);
                            }
                        }

                        string strName = System.IO.Path.GetFileName(file.FileName);
                        string PhyPath = context.Server.MapPath("/UpLoad/" + strName);
                        img.Save(PhyPath);
                        sbMsg.AppendLine(strName+"<br/>");
                    }
                    }
                }
            }
            context.Response.Write("上传成功！<br/>" + sbMsg.ToString());
        }