.Net学习笔记之Layui多图片上传功能

<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ie8
obj.preview(function (index, file, result) {
$('#demo2').append(
'<img src="' + result + '" alt="' + file.name + '" class="layui-upload-img">');
});
},
done: function (res) {
if (res.isSuccess == true) {
layer.msg("上传成功");
var scrollingGraph = $("#ScrollingGraph").val();
if (scrollingGraph == "") {
$("#ScrollingGraph").val(res.path);
} else {
scrollingGraph += ',' + res.path;
$("#ScrollingGraph").val(scrollingGraph);
}
console.log(scrollingGraph);
} else {
return layer.msg('上传失败');
}
}
});
});


//清空所有图片
function clearAll() {
layer.confirm("确定要全部清空吗？", {
icon: 3,
btn: ["确定", "取消"],
yes: function (index) {
$("#demo2").html("");
$("#ScrollingGraph").val("");
layer.close(index);
}
});
}

</script>

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;
}
}