javascript代码:

Ext.onReady(function() {                Ext.create('Ext.form.Panel',                {                title: 'Upload a Photo',                width: 400,                bodyPadding: 10,                frame: true,                renderTo: "div1",                items: [{                    xtype: 'filefield',                    name: 'photo',                    fieldLabel: 'Photo',                    labelWidth: 50,                    msgTarget: 'side',                    allowBlank: false,                    anchor: '100%',                    buttonText: 'Select Photo...'}],                    buttons: [{ text: 'Upload',                        handler: function() {                            var form = this.up('form').getForm();                            if (form.isValid()) {                                form.submit({ url: 'RemoteFileUpload.aspx',                                    waitMsg: 'Uploading your photo...',                                    success: function(fp, o) {                                        Ext.Msg.alert('Success', 'Your photo "' + o.result.file + '" has been uploaded.');                                    }                                });                            }                        }                }]            });        });

后台代码:

protected void Page_Load(object sender, EventArgs e)        {            Response.Clear();            if (this.SaveFiles())            {                Response.Write("{success:true,msg:'File was successfully uploaded.'}");            }            else            {                Response.Write("{success:true,msg:'Possible file upload attack!'}");            }            Response.End();        }        public Boolean SaveFiles()        {            ///遍历File表单元素                  HttpFileCollection files = HttpContext.Current.Request.Files;            try            {                for (int iFile = 0; iFile < files.Count; iFile++)                {                               ///检查文件扩展名字                                  HttpPostedFile postedFile = files[iFile];                    string fileName, fileExtension;                    fileName = System.IO.Path.GetFileName(postedFile.FileName);                    if (fileName != "")                    {                        ///注意：可能要修改你的文件夹的匿名写入权限。                                   postedFile.SaveAs(System.Web.HttpContext.Current.Request.MapPath("upload_files/") + fileName);                    }                }                 return true;            }            catch (System.Exception Ex)            {                 return false;             }        }