方法里包括了图片大小限制、图片尺寸、文件内容等等的判断。。。
该案例是mvc下的demo,支持单张图片上传。
public ActionResult Upload() { string imgurl = ""; foreach (string key in Request.files) { //这里只测试上传第一张图片file[0] httpPostedfileBase file0 = Request.files[key]; //转换成byte,读取图片MIME类型 Stream stream; int size = file0.ContentLength / 1024; //文件大小KB if (size > 1024) { return Content(ReturnMsg(Enum_Return.失败,"图片不能超过1M:",null)); } byte[] fileByte = new byte[2];//contentLength,这里我们只读取文件长度的前两位用于判断就好了,这样速度比较快,剩下的也用不到。 stream = file0.inputStream; stream.Read(fileByte,2);//contentLength,还是取前两位 //获取图片宽和高 //System.Drawing.Image image = System.Drawing.Image.FromStream(stream); //int wIDth = image.WIDth; //int height = image.Height; string fileFlag = ""; if (fileByte != null && fileByte.Length > 0)//图片数据是否为空 { fileFlag = fileByte[0].ToString() fileByte[1].ToString(); } string[] fileTypestr = { "255216","7173","6677","13780" };//对应的图片格式jpg,gif,bmp,png if (fileTypestr.Contains(fileFlag)) { string action = Request["action"]; string path = "/uploads/"; switch (action) { case "headimage": path = "headimage/"; break; case "blogtype": path = "blogtype/"; break; } string fullpath = path UserInfo.userID "/"; if (!Directory.Exists(Server.MapPath(fullpath))) { Directory.CreateDirectory(Server.MapPath(fullpath)); } Request.files[key].SaveAs(Server.MapPath(fullpath Request.files[key].filename)); imgurl = fullpath Request.files[key].filename; } else { return Content(ReturnMsg(Enum_Return.失败,"图片格式不正确:" fileFlag,null)); } stream.Close(); } return Content(ReturnMsg(Enum_Return.成功,"上传成功",imgurl)); }
一般处理程序
public voID ProcessRequest(httpContext context) { context.Response.ContentType = "application/Json"; httpPostedfile _upfile = context.Request.files["file"]; if (_upfile.ContentLength < 500000) { if (string.IsNullOrEmpty(_upfile.filename)) { context.Response.Write("请上传图片"); } string fileFullname = _upfile.filename; string dataname = DateTime.Now.ToString("yyyyMMddhhmmss"); string filename = fileFullname.Substring(fileFullname.LastIndexOf("\") 1); string type = fileFullname.Substring(fileFullname.LastIndexOf(".") 1); if (type == "bmp" || type == "jpg" || type == "gif" || type == "JPG" || type == "BMP" || type == "GIF") { _upfile.SaveAs(httpContext.Current.Server.MapPath("photo") "\" dataname "." type); httpcookie cookie = new httpcookie("photo"); context.Response.Write("上传成功"); } else { context.Response.Write("支持格式:|jpg|gif|bmp|"); } } else { context.Response.Write("你的图片已经超过500K的大小!"); } }
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