下面是extjs列表中文件上传与下载：
如图：
一、上传
上传按钮：
{ xtype: 'button', 60, margin: '0 20', text: ' 上 传 ', handler: 'onUploadClick' }]
上传按钮事件（打开上传窗口和传参）：
onUploadClick: function () { var me = this, view = me.getView(), vm = view.getViewModel(), store = me.getStore('gridstore'), filType = view.up('window').FIL_TYPE,//附件类型（1：项目附件，2：需求附件，3需求明细附件） fileId = view.up('window').FILE_RELATION_ID;//附件关系ID（项目表ID，需求表ID，需求明细表ID） var userOper = Ext.create('MainApp.view.comm.UploadOperation.Operation'); Ext.create('Ext.window.Window', { title: '上传文件', resizable: false, constrain: true, modal: true, items: userOper, 400, height: 120, _up: this, FIL_TYPE: filType, FILE_RELATION_ID:fileId, listeners: { beforeclose: function () { store.reload(); } } }).show(); },
上传窗口：
/* *********************************************** * author : zh * function: 上传文件 * history: created by 2017/12/18 * ***********************************************/ Ext.define('MainApp.view.comm.UploadOperation.Operation', { extend: 'Ext.form.Panel', requires: [ 'MainApp.view.comm.UploadOperation.OperationController', 'MainApp.view.comm.UploadOperation.OperationModel', 'Fm.ux.form.FileUpload', 'Ext.window.MessageBox' ], alias: 'widget.Upload_Operation', controller: 'Upload_OperationController', viewModel: { type: 'Upload_Operation' }, modelValidation: true, tbar: [ { xtype: "form", frame: false, anchor: '100%', header: false, align: 'center', layout: 'hbox', defaults: { anchor: '100%', allowBlank: false, msgTarget: 'side', labelWidth: 60, }, resuiltTpl: new Ext.XTemplate( '文件{fileName}上传成功!' //<br /> //'共{rowNum}条数据' ), items: [ { xtype: 'filefield', emptyText: '请选择要上传的文件', name: 'fileUpName', buttonText: '浏览…', 180, margin: '0 0 0 5' }, { xtype: 'button', text: '导入', margin: '0 0 0 5', handler: function () { var that = this.up('form'); var form = that.getForm(); if (form.isValid()) { var filType = this.up('window').FIL_TYPE;//附件类型（1：项目附件，2：需求附件，3需求明细附件） var fileRelationId = this.up('window').FILE_RELATION_ID;//附件关系ID（项目表ID，需求表ID，需求明细表ID） form.submit({ url: '/DataBase/UpLoadFile?filType=' + filType + '&fileRelationId=' + fileRelationId, waitMsg: '数据上传中...', success: function (fp, o) { Ext.Msg.show({ title: '成功', msg: that.resuiltTpl.apply(o.result), minWidth: 200, modal: true, icon: Ext.Msg.INFO, buttons: Ext.Msg.OK, fn: function (btn) { var upw = that.up('window')._up; upw.onSearchClick(); } }); }, failure: function () { Ext.Msg.alert("失败", Ext.JSON.decode(this.response.responseText).message); } }); } } }, { xtype: 'button', text: '清除', margin: '0 0 0 5', handler: function () { this.up('form').getForm().reset(); } }] } ], items: [ { xtype: 'panel', items: [ ], buttonAlign: 'center', buttons: [ { text: '关闭', 80, handler: 'onCancel' } ] }], });
上传后台方法（重新使用guid命名，避免文件重复被替换，原名称需要保存到数据库）：
/// <summary> /// 上传文件 /// </summary> /// <returns></returns> [HttpPost] public ActionResult UpLoadFile(string filType,string fileRelationId) { try { WFile wfile = new WFile(); HttpPostedFileBase file = Request.Files[0]; if (file == null) { return Json(new { success = false, message = "没有选择文件！", errors = new { fileUpName = "上传数据出错！" } }); } //if (!file.FileName.Contains(".doc") && !file.FileName.Contains(".docx")) //{ // return Json(new { success = false, message = "文件格式不正确，只能上传Word文件！", errors = new { fileUpName = "上传数据出错！" } }); //} string guId = Guid.NewGuid().ToString("N"); string extension = Path.GetExtension(file.FileName); var filePath = Path.Combine(Request.MapPath("~/Upload"), Path.GetFileName(guId + extension)); file.SaveAs(filePath); //数据库操作 wfile.FIL_TYPE = filType; wfile.FILE_RELATION_ID = fileRelationId; wfile.FIL_NAME = file.FileName; wfile.FIL_PATH = guId + extension; _wfile.Add(wfile); return Json(new { success = true, fileName = file.FileName, rowNum = 1 }); } catch (System.Exception ex) { return Json(new { success = false, message = ex.Message, errors = new { fileUpName = "上传数据出错！" } }); } }
二、下载
下载按钮：
columns: [ { dataIndex: 'NUMROW', text: '序号', 40 }, { dataIndex: 'FIL_NAME', text: '附件名称', flex: 1 }, { dataIndex: 'FIL_PATH', header: '文件路径', align: 'center', flex: 1, hidden: true }, { dataIndex: 'USER_NAME', text: '创建人', flex: 1 }, { text: '上传时间', dataIndex: 'CREATE_DATE', align: 'left', 125, flex: 1, renderer: Ext.util.Format.dateRenderer('Y-m-d') }, { text: '操作', xtype: 'actioncolumn', 80, flex: 1, items: [ { icon: '../images/redactBtn_down.PNG', handler: 'DownFile' }, ] } ],
下载按钮事件：
DownFile: function (grid, rowIndex, colIndex, e, td, tr) { window.location.href = '/DataBase/DownFile?fileName=' + tr.get('FIL_NAME') + "&filePathName=" + tr.get('FIL_PATH'); }
下载后台方法（需要用原附件名称替换guid名称完成下载）：
/// <summary> /// 下载附件 /// </summary> /// <param name="fileName">原文件名称</param> /// <param name="filePathName">附件地址名称</param> /// <returns></returns> public ActionResult DownFile(string fileName, string filePathName) { try { var filePath = Path.Combine(Request.MapPath("~/Upload"), Path.GetFileName(filePathName)); FileStream fs = new FileStream(filePath, FileMode.Open); byte[] bytes = new byte[(int)fs.Length]; fs.Read(bytes, 0, bytes.Length); fs.Close(); System.Web.HttpContext.Current.Response.ContentType = "application/octet-stream"; //通知浏览器下载文件而不是打开 System.Web.HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName); System.Web.HttpContext.Current.Response.BinaryWrite(bytes); System.Web.HttpContext.Current.Response.Flush(); System.Web.HttpContext.Current.Response.End(); return Json(new { success = true, fileName = fileName, rowNum = 1 }); } catch (System.Exception ex) { return Json(new { success = false, message = ex.Message, errors = new { fileUpName = "上传数据出错！" } }); } }
最后，常见问题补充，上传文件大于4mb会发生错误：
解决办法：配置config
<httpRuntime maxRequestLength="951200" targetFramework="4.5"/>