mvc上传

1.在视图中显示上传按钮

<div class="control-group">
                        <label class="control-label">资料附件：</label>
                        <div class="controls">
                                <input type="file" id="DataAppend" style="display:none" value="上传" />
                                <input type="text" style="600px" readonly="true" id="showtxt" name="DataAppend" value="@Model.DataAppend"  />
                                <input type="button" id="sc" name="name" value="上传" />
                        </div>
                    </div>

一个type='file' 的input  一个type='button'的input

在js中写点击上传事件

 $("#sc").click(function () {
            $("#DataAppend").click();
        })
        $('#DataAppend').fileupload({
            dataType: 'json',
            url: "/HOS/Apprentice/SmritiDataUpload",
            progressall: function (e, data) {
                var progress = parseInt(data.loaded / data.total * 100, 10);
                $('#progress .bar').css({ 'width': progress + '%', 'height': '5px' }
                );
            },
            done: function (e, data) {
                debugger;
                if (data.result[0].result != "OK") {
                    $('#progress .bar').css({ 'width': '0%', 'height': '0px' });
                    alert(data.result[0].result);
                }
                else {
                    debugger;
                    $("#showtxt").val(data.result[0].url);
                }
            }
        });

点击上传按钮时实现上传事件 .fileupload()

走入后台控制器SmritiDataUpload方法

 [HttpPost]
        public ActionResult SmritiDataUpload()
        {
            var result = new List<ViewDataUploadFilesResult>();
            try
            {
                foreach (string file in Request.Files)
                {
                    var statuses = new List<ViewDataUploadFilesResult>();
                    var headers = Request.Headers;

                    if (string.IsNullOrEmpty(headers["X-File-Name"]))
                    {
                        UploadWholeFile(Request, statuses, "file");
                    }
                    else
                    {
                        UploadPartialFile(headers["X-File-Name"], Request, statuses);
                    }

                    JsonResult jsonresult = Json(statuses);
                    jsonresult.ContentType = "text/plain";

                    return jsonresult;
                }
                return Json(result);
            }
            catch (Exception)
            {
                throw;
            }
        }

上面的方法中包含两个方法，一个是UploadWholeFile()和UploadPartialFile()方法

当不存在headers["X-File-Name"]时走入UploadWholeFile()方法===上传多个文件，存在走入UploadPartialFile()方法

在UploadWholeFile()文件中 需要先判断上传文件的文件类型是否是有效文件

   private string ISValid(HttpPostedFileBase file, string dirName)
        {
            //定义允许上传的文件扩展名
            Hashtable extTable = new Hashtable();
            extTable.Add("image", "gif,jpg,jpeg,png,bmp");
            extTable.Add("flash", "swf,flv");
            extTable.Add("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");
            extTable.Add("file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2,pdf");
            //extTable.Add("file", "doc,docx,pdf");
            //最大文件大小
            int maxSize = 2000000;
            String fileName = file.FileName;
            String fileExt = Path.GetExtension(fileName).ToLower();

            if (file.InputStream == null || file.InputStream.Length > maxSize)
            {
                return "上传文件大小超过限制。";
            }

            if (String.IsNullOrEmpty(fileExt) || Array.IndexOf(((String)extTable[dirName]).Split(','), fileExt.Substring(1).ToLower()) == -1)
            {
                return "上传文件扩展名是不允许的扩展名。
只允许" + ((String)extTable[dirName]) + "格式。";
            }
            return "OK";
        }

将有效的文件类型

上传各种文件类型之前首先要对上传的文件进行验证，检验是否是有效文件。如果需要添加新的文件类型，可以在哈希表中添加新的键值。

下面贴出UploadWholeFile()和UploadPartialFile()方法

 private void UploadWholeFile(HttpRequestBase request, List<ViewDataUploadFilesResult> statuses, string type = "image")
        {
            for (int i = 0; i < request.Files.Count; i++)
            {
                string result = ISValid(request.Files[i], type);
                if (result != "OK")
                {
                    statuses.Add(new ViewDataUploadFilesResult() { result = result });
                }
            }
            if (statuses.Count > 0) return;
            for (int i = 0; i < request.Files.Count; i++)
            {
                var file = request.Files[i];

                if (!Directory.Exists(StorageRoot))
                {
                    Directory.CreateDirectory(StorageRoot);
                }
                string fileExt = Path.GetExtension(file.FileName).ToLower();
                Log4NetHelper.Error(LoggerType.WebExceptionLog, "原文件名：" + file.FileName, null);
                string newFileName = DateTime.Now.ToString("yyyyMMddHHmmss_ffff", DateTimeFormatInfo.InvariantInfo) + fileExt;
                Log4NetHelper.Error(LoggerType.WebExceptionLog, "新文件名：" + newFileName, null);
                var fullPath = Path.Combine(StorageRoot, newFileName);
                file.SaveAs(fullPath);
                ViewDataUploadFilesResult fileResult = new ViewDataUploadFilesResult()
                {
                    result = "OK",
                    name = newFileName,
                    size = file.ContentLength,
                    type = file.ContentType,
                    url = Path.Combine(path, Path.GetFileName(newFileName)),
                    delete_type = "GET",
                    oldname = file.FileName,
                };
                if (type == "image")
                {
                    fileResult.thumbnail_url = @"data:image/png;base64," + EncodeFile(fullPath);
                }
                statuses.Add(fileResult);
            }
        }

private void UploadPartialFile(string fileName, HttpRequestBase request, List<ViewDataUploadFilesResult> statuses)
        {
            if (request.Files.Count != 1) throw new HttpRequestValidationException("Attempt to upload chunked file containing more than one fragment per request");
            var file = request.Files[0];
            string result = ISValid(file, "image");
            if (result != "OK")
            {
                statuses.Add(new ViewDataUploadFilesResult() { result = result });
            }
            if (statuses.Count > 0) return;
            var inputStream = file.InputStream;
            if (!Directory.Exists(StorageRoot))
            {
                Directory.CreateDirectory(StorageRoot);
            }
            string fileExt = Path.GetExtension(file.FileName).ToLower();
            string newFileName = DateTime.Now.ToString("yyyyMMddHHmmss_ffff", DateTimeFormatInfo.InvariantInfo) + fileExt;
            var fullName = Path.Combine(StorageRoot, newFileName);

            using (var fs = new FileStream(fullName, FileMode.Append, FileAccess.Write))
            {
                var buffer = new byte[1024];

                var l = inputStream.Read(buffer, 0, 1024);
                while (l > 0)
                {
                    fs.Write(buffer, 0, l);
                    l = inputStream.Read(buffer, 0, 1024);
                }
                fs.Flush();
                fs.Close();
            }
            ViewDataUploadFilesResult fileResult = new ViewDataUploadFilesResult()
            {
                result = "OK",
                name = newFileName,
                size = file.ContentLength,
                type = file.ContentType,
                url = Path.Combine(path, Path.GetFileName(newFileName)),
                delete_type = "GET",
            };
            if (fileExt.Contains("gif,jpg,jpeg,png,bmp"))
            {
                fileResult.thumbnail_url = @"data:image/png;base64," + EncodeFile(fullName);
            }
            statuses.Add(fileResult);
        }