using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.IO; using System.Drawing; namespace CZBK.ItcastProject.WebApp._2015_5_27 { /// <summary> /// ProcessFileUp 的摘要说明 /// </summary> public class ProcessFileUp : IHttpHandler { public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/html"; HttpPostedFile file = context.Request.Files[0];//获取上传的文件 if (file.ContentLength > 0) { //对上传的文件类型进行校验 string fileName = Path.GetFileName(file.FileName);//获取上传文件的名称，包含扩展名 string fileExt = Path.GetExtension(fileName);//获取用户上传的文件扩展名 if (fileExt == ".jpg") { //对上传文件进行重命名 string newfileName = Guid.NewGuid().ToString(); //将上传的文件放在不同目录下 string dir = "/ImageUpload/" + DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day + "/"; //创建文件夹 if (!Directory.Exists(context.Request.MapPath(dir))) { Directory.CreateDirectory(context.Request.MapPath(dir)); } //文件的完整路径 string fullDir = dir + newfileName + fileExt; //注意：保存一定要用context.Request.MapPath来回去路径 file.SaveAs(context.Request.MapPath(fullDir)); //创建图片的水印 //using (Image img = Image.FromStream(file.InputStream))//或者下面的 //根据上传成功的图片创建一个Image using (Image img=Image.FromFile(context.Request.MapPath(fullDir))) { //根据画布的高度与宽度创建画布 using (Bitmap map =new Bitmap(img.Width,img.Height)) { //为画布创建画笔 using (Graphics g=Graphics.FromImage(map)) { g.DrawImage(img, 0, 0, img.Width, img.Height); g.DrawString("图片加水印", new Font("宋体", 30.0f, FontStyle.Bold), Brushes.Red, new PointF(map.Width - 400, map.Height - 200)); string waterImageName="water"+Guid.NewGuid().ToString(); map.Save(context.Request.MapPath("/ImageUpload/"+waterImageName+".jpg"),System.Drawing.Imaging.ImageFormat.Jpeg); context.Response.Write("<html><body><img src='" + fullDir + "'></br><img src='/ImageUpload/" + waterImageName + ".jpg' /></body></html>"); } } } //context.Response.Write("<html><body><img src='" + fullDir + "'></body></html>"); //file.SaveAs(context.Request.MapPath("/ImageUpload/"+fileName));//完成文件的保存 //context.Response.Write("<html><body><img src='/ImageUpload/" + fileName + "'></body></html>"); } else { context.Response.Write("只能上传图片文件"); } } else { context.Response.Write("请选择上传文件"); } } public bool IsReusable { get { return false; } } } }
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> </head> <body> <form action="ProcessFileUp.ashx" method="post" enctype="multipart/form-data"> <input type="file" name="fileup" /> <input type="submit" value="上传" /> </form> </body> </html>