ajax file asynchronous implementation of form upload

 选择文件:
  

public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; HttpPostedFile file1 = context.Request.Files["file1"]; helper.uploadFile(file1, "~/upload/");//这里就是对相应方法进行调用 context.Response.Write("ok");//提示执行成功 }

/// 
 /// 上传图片 /// 
 /// 通过form表达提交的文件 /// 文件要保存的虚拟路径 public static void uploadImg(HttpPostedFile file,string virpath) { if (file.ContentLength > 1024 * 1024 * 4) { throw new Exception("文件不能大于4M"); } string imgtype = Path.GetExtension(file.FileName); if(imgtype!=".jpg"&&imgtype!=".jpeg") //图片类型进行限制 { throw new Exception("请上传jpg或JPEG图片"); } using (Image img = Bitmap.FromStream(file.InputStream)) { string savepath = HttpContext.Current.Server.MapPath(virpath+file.FileName); img.Save(savepath); } } /// 
 /// 上传文件 /// 
 /// 通过form表达提交的文件 /// 文件要保存的虚拟路径 public static void uploadFile(HttpPostedFile file, string virpath) { if (file.ContentLength > 1024 * 1024 * 6) { throw new Exception("文件不能大于6M"); } string imgtype = Path.GetExtension(file.FileName); //imgtype对上传的文件进行限制 if (imgtype != ".zip" && imgtype != ".mp3") { throw new Exception("只允许上传zip、rar....文件"); } string dirFullPath= HttpContext.Current.Server.MapPath(virpath); if (!Directory.Exists(dirFullPath))//如果文件夹不存在，则先创建文件夹 { Directory.CreateDirectory(dirFullPath); } file.SaveAs(dirFullPath + file.FileName); }

   
  选择文件:
   

public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/html"; if (context.Request.Files.Count > 0) { HttpPostedFile file1 = context.Request.Files["myfile"]; helper.uploadFile(file1, "~/upload/"); //这里引用的是上面封装的方法 WriteJson(context.Response, "true", ""); } else { WriteJson(context.Response, "error", "请选择要上传的文件"); } }

public static void WriteJson(HttpResponse response, string status1, string msg1, object data1 = null) { response.ContentType = "application/json"; var obj = new { status = status1, msg = msg1, data = data1 }; string json = new JavaScriptSerializer().Serialize(obj); response.Write(json); }