多图上传在一些特殊的需求中我们经常会遇到，其实多图上传的原理大家都有各自的见解。对于Layui多图上传和我之前所说的通过js获取文本框中的文件数组遍历提交的原理一样，只不过是Layui中的upload.render方法已经帮我们封装好了，我们只管调用即可，也就是说你选中了几张图片，那么将会向后台请求与图片张数相同的次数，即为遍历提交的方式。
<li><h6>滚动图片：</h6> <div class="layui-upload"><button type="button" class="layui-btn" id="test2">滚动图片上传【推荐上传三张】</button> <button type="button" class="layui-btn layui-btn-danger" onclick="clearAll()"><i class="layui-icon"></i></button><input type="hidden" name="ScrollingGraph" id="ScrollingGraph"/><blockquote class="layui-elem-quote layui-quote-nm" style="margin-top: 10px;">预览图：<div class="layui-upload-list" id="demo2"></div></blockquote></div></li>
<script>layui.use('upload',function () {var $ = layui.jquery, upload = layui.upload;//多图片上传upload.render({ elem: '#test2', url: '/FileUpload/FileLoad/', multiple: true,//允许选择多张图片before: function (obj) {//预读本地文件示例，不支持ie8obj.preview(function (index, file, result) {$('#demo2').append('<img src="' + result + '" style="margin: 0px; padding: 0px; outline: none; line-height: 25.2px; font-size: 14px; width: 660px; overflow: hidden; clear: both; font-family: tahoma, arial, "Microsoft YaHei";"> 1public class FileUploadController : Controller 2{ 3/// <summary>/// 对验证和处理 HTML 窗体中的输入数据所需的信息进行封装，如FromData拼接而成的文件/// </summary>/// <param name="context">FemContext对验证和处理html窗体中输入的数据进行封装</param>/// <returns></returns>[HttpPost]public ActionResult FileLoad(FormContext context) {HttpPostedFileBase httpPostedFileBase = Request.Files[0];//获取二进制图片文件流if (httpPostedFileBase != null){try{ControllerContext.HttpContext.Request.ContentEncoding = Encoding.GetEncoding("UTF-8");ControllerContext.HttpContext.Response.Charset = "UTF-8";string fileName = Path.GetFileName(httpPostedFileBase.FileName);//原始文件名称string fileExtension = Path.GetExtension(fileName);//文件扩展名byte[] fileData = ReadFileBytes(httpPostedFileBase);//文件流转化为二进制字节string result = SaveFile(fileExtension, fileData);//文件保存if (string.IsNullOrEmpty(result)){return Json(new { isSuccess = false, path = "",errorMsg= "上传文件失败"});}return Json(new { isSuccess = true, path = result });}catch (Exception ex){return Json(new { isSuccess = false, path = "" });}}else{return Json(new { isSuccess = false, path = "" });}}/// <summary>/// 将文件流转化为二进制字节/// </summary>/// <param name="fileData">图片文件流</param>/// <returns></returns>private byte[] ReadFileBytes(HttpPostedFileBase fileData){byte[] data;using (Stream inputStream = fileData.InputStream){MemoryStream memoryStream = inputStream as MemoryStream;if (memoryStream == null){memoryStream = new MemoryStream();inputStream.CopyTo(memoryStream);}data = memoryStream.ToArray();}return data;}/// <summary>/// 保存文件/// </summary>/// <param name="fileExtension">文件扩展名</param>/// <param name="fileData">图片二进制文件信息</param>/// <returns></returns>private string SaveFile(string fileExtension, byte[] fileData){string result;try{string saveName = Guid.NewGuid().ToString()+ fileExtension; //保存文件名称// 文件上传后的保存路径string basePath = "UploadFile";string saveDir = DateTime.Now.ToString("yyyy-MM-dd");string savePath = System.IO.Path.Combine(saveDir, saveName);string serverDir = System.IO.Path.Combine(Server.MapPath("~/"), basePath, saveDir);if (!System.IO.Directory.Exists(serverDir)){System.IO.Directory.CreateDirectory(serverDir);}string fileNme = System.IO.Path.Combine(serverDir, saveName);//保存文件完整路径System.IO.File.WriteAllBytes(fileNme, fileData);//WriteAllBytes创建一个新的文件，按照对应的文件流写入，假如已存在则覆盖//返回完整的图片保存地址result="/"+basePath + "/" + saveDir + "/" + saveName;}catch (Exception){result = "发生错误";}return result;}} 
