1、最近应项目开发的需求要实现附件的异步上传和下载。
2、上传：文件上传到指定的路径下，并返回上传文件的信息给前端界面，如:文件的图标、上传的文件名、文件的大小。
3、上传后，在前端界面上显示上传的文件信息，点击文件名实现将上传的文件下载到本地。
4、先展示一下Demo运行的效果图：
点击提交后：
点击文件名实现下载到本地：
5、下面就给出前台代码：
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Ajax Form - jQuery EasyUI Demo</title> <link type="text/css" href="https://www.jeasyui.com/easyui/themes/default/easyui.css"> <link type="text/css" href="https://www.jeasyui.com/easyui/themes/icon.css"> <link type="text/css" href="https://www.jeasyui.com/easyui/demo/demo.css"> <script type="text/javascript" src="https://code.jquery.com/jquery-1.6.1.min.js"></script> <script type="text/javascript" src="https://www.jeasyui.com/easyui/jquery.easyui.min.js"></script> </head> <body> <h2>Ajax Form Demo</h2> <div> <div> </div> <div>Type in input box and submit the form.</div> </div> <div title="Ajax Form"> <form action="api/Loding" method="post" enctype="multipart/form-data"> <table> <tr> <td>Name:</td> <td><input></input></td> </tr> <tr> <td>Email:</td> <td><input></input></td> </tr> <tr> <td>Phone:</td> <td><input></input></td> </tr> <tr> <td>File:</td> <td><input></input></td> </tr> <tr> <td></td> <td><input type="submit" value="提交"></input></td> </tr> </table> <input type="text" value="LodingTable" hidden="hidden" /> </form> </div> <div> <img src="" /> <a downloadid="0" href="#"></a> <label>文件大小：</label> <label></label><button>删除</button> <button>导入1</button> </div> <style scoped> .f1 { width: 200px; } </style> <script type="text/javascript"> $(function () { $("#loding").hide(); $("#delete").hide().click(function () { alert("删除文件"); }); $("#loding").click(function () { var tUrl = '/api/Loding/Get'; //var tJsonStr = '{"idInventoryPrice":"4","withdrawDetails":[{"cInvCode":"800487","cInvCodeSub":"00","iConverDiscount":"0","iUnitPrice":"9.9","iSalePrice":"9.9"},{"cInvCode":"800689","cInvCodeSub":"00","iConverDiscount":"0","iUnitPrice":"6.5","iSalePrice":"5.9"}]}'; $.ajax({ type: "Get", url: tUrl, dataType: "json", async: false, success: function (data) { alert(JSON.stringify(data)); } }); }); $('#ff').form({ success: function (data) { var json = JSON.parse(data); if (json.result == 1) { $("#delete").show(); $("#img").attr("src", json.details[0].AttachmentNameTypeICO); $("#downLoad").attr("downloadid", json.details[0].ID); $("#downLoad").html(json.details[0].AttachmentName); $(".size").html(json.details[0].AttachSize + "KB"); var tUrl = 'http://localhost:11703/api/Loding/DownLoad?ID=' + $("#downLoad").attr("downloadid"); $("#downLoad").attr("href", tUrl); } else { alert(json.resultdetail); } } }); }); </script> </body> </html>
6、后台上传代码：
NameValueCollection nvf = HttpContext.Current.Request.Form; if (!Request.Content.IsMimeMultipartContent()) { throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType); } string tempPath = "/Upload/" + DateTime.Now.ToString("yyyy-MM-dd/"); string fileSaveLocation = HttpContext.Current.Server.MapPath("~" + tempPath);//附件的保存地址 Dictionary<string, object> dic = new Dictionary<string, object>(); if (!Directory.Exists(fileSaveLocation)) { Directory.CreateDirectory(fileSaveLocation); } CustomMultipartFormDataStreamProvider provider = new CustomMultipartFormDataStreamProvider(fileSaveLocation); try { var result = await Request.Content.ReadAsMultipartAsync(provider).ContinueWith<Dictionary<string, object>>(x => { var file = provider.FileData[0]; FileInfo fileinfo = new FileInfo(file.LocalFileName); if (fileinfo.Length <= 0) { dic.Add("result", -1); dic.Add("resultdetail", "未上传文件"); } else { double? filelength = fileinfo.Length / 1024.0; if (filelength > 10 * 1024) { dic.Add("result", -1); dic.Add("resultdetail", "上传文件不能大于10M"); } else { string saveFileName = Guid.NewGuid().ToString() + fileinfo.Extension; fileinfo.CopyTo(Path.Combine(fileSaveLocation, saveFileName), true); fileinfo.Delete(); dic.Add("result", 1); dic.Add("resultdetail", "上传成功"); dic.Add("realPath", file.LocalFileName);//附件保存的绝对路径 dic.Add("attachmentType", fileinfo.Extension);//附件类型 dic.Add("attachmentName", Path.GetFileName(file.LocalFileName));//上传的附件名 dic.Add("attachSize", Convert.ToInt32(filelength));//附件大小KB dic.Add("aealPath", tempPath + saveFileName);//附件保存相对路径 } } return dic; }, TaskScheduler.FromCurrentSynchronizationContext()); } catch (Exception ex) { return HandleJson.ToJson(ex.ToString(), false); } var isSuccess = dic["result"].TryToInt() == 1; var msg = dic["resultdetail"].TryToString();//返回上传信息 var realPath = string.Empty;//附件保存的绝对路径 var relativePath = string.Empty;//返回相对路径 var AttachSize = 0;//文件大小kB var AttachmentType = string.Empty;//文件扩展名 var AttachmentName = string.Empty;//原文件名 if (isSuccess) { realPath = dic["realPath"].TryToString(); relativePath = dic["aealPath"].TryToString(); AttachSize = dic["attachSize"].TryToInt(); AttachmentType = dic["attachmentType"].TryToString(); AttachmentName = dic["attachmentName"].TryToString(); } StringBuilder sql = new StringBuilder(); if (isSuccess) { try { #region 获取图标路径 var ICOPath = string.Empty; sql.Append(@"SELECT * FROM dbo.AttachmentType(NOLOCK) WHERE AttachmentType=@AttachmentType"); var ICOTable = Common.HandleSQL.GetData(sql.ToString(), null, new SqlParameter[] { new SqlParameter("@AttachmentType", AttachmentType) }); if (ICOTable.Rows.Count <= 0) { ICOPath = ""; } else { ICOPath = ICOTable.Rows[0]["AttachmentNameTypeICO"].ToString(); } #endregion 获取图标路径 #region 保存上传记录 sql.Clear(); sql.Append(@"DECLARE @ID INT SELECT @ID=MAX(ID)+1 FROM dbo.Attachment(NOLOCK) IF(@ID IS NULL) BEGIN SET @ID=1 END INSERT INTO dbo.Attachment ( ID , AttachmentName , AttachmentType , RealPath , AttachSize , UpLoadDate , UpLoadPerson , UpLoadIPAddress ) VALUES ( @ID , -- ID - int @AttachmentName , -- AttachmentName - nvarchar(max) @AttachmentType , -- AttachmentType - nvarchar(50) @RealPath , -- RealPath - nvarchar(max) @AttachSize , -- AttachSize - bigint GETDATE() , -- UpLoadDate - datetime @UpLoadPerson , -- UpLoadPerson - nvarchar(50) @UpLoadIPAddress -- UpLoadIPAddress - varchar(50) ) SELECT * FROM dbo.Attachment(NOLOCK) WHERE ID=@ID; "); SqlParameter[] paras = new SqlParameter[] { new SqlParameter("@AttachmentName", AttachmentName), new SqlParameter("@AttachSize", AttachSize), new SqlParameter("@RealPath", relativePath), new SqlParameter("@AttachmentType", AttachmentType),new SqlParameter("@UpLoadPerson","魏小伟"),new SqlParameter("@UpLoadIPAddress",HandleLog.getIPAddress()) }; var insert = GetData(sql.ToString(), null, paras); insert.Columns.Add("AttachmentNameTypeICO", typeof(string)); insert.Rows[0]["AttachmentNameTypeICO"] = ICOPath; int ID = Convert.ToInt32(insert.Rows[0]["ID"].ToString());//上传附件的ID return HandleJson.ToJson(insert, 0); #endregion 保存上传记录 } catch (Exception ex) { if (System.IO.File.Exists(realPath)) { File.Delete(realPath); } return HandleJson.ToJson(ex.ToString(), false); } } else { return HandleJson.ToJson(msg, false); }
7、下载代码：