jquery ajax file upload NET MVC 无刷新文件上传

网上有各种各样的文件上传方法，有基于JS框架的、也有基于flash swf插件的。

这次分享一个比较简单而且实用能快速上手的文件上传方法，主要步骤：

1.引用Jquery包，我用的是jquery-1.11.3.min.js 版本

2.编写JS代码

3.HTML中增加type=file控件

代码如下：

HTML代码：

    <form id="fileupload" method="post"  enctype = "multipart/form-data">
         <input type="file" id="fileid" name="fileid" accept="application/vnd.ms-excel">
　　　　　<input type="button" id="confirmuploadid" value="上传" />
    </form> 

//JS实现

$('#confirmuploadid').on('click', function () {
    uploadProduct();

});

function uploadProduct() {
    var formid = $("#fileupload");
     var fd = new FormData(formid[0]);  //form表单的方式实例化一个formData
    fd.append('file', $('#fileid')[0].files);
    fd.append('userid', userid);
    $.ajax({
        url: 'File/Setting',
        type: 'POST',
        dataType: 'JSON',
        data: fd,
        async: false,
        cache: false,
        contentType: false,
        processData: false,
        beforeSend: function () {
            $("#confirmuploadid").prop("disabled", true);
        },
        success: function (returndata) {
           $("#confirmuploadid").prop("disabled", false);
            alert(returndata.Message);
        },
        error: function (returndata) {
            alert("上传失败,请检查数据正确性,如：有些数字输入项，是否输入了字符！");
        }
    });
}        

//MVC实现
public class FileController : Controller
    {
        [HttpPost]
        public ActionResult Setting()
        {
            string userid = ""; string username = "";
            FunctionBackMessage functionBackMessage = new FunctionBackMessage();
            functionBackMessage.IsSuccess = false;
            functionBackMessage.Message="上传失败，稍后重试！";
            if (!string.IsNullOrEmpty(username))
            {
                HttpFileCollectionBase files = Request.Files;
                string _urlstr = Request.Url.AbsoluteUri;
                FunctionBackMessage fc = new FunctionBackMessage();
                fc.IsSuccess = true; fc.Message = "上传成功";
                if (files.AllKeys.Length > )
                {
                    for (int i = ; i < files.AllKeys.Length; i++)
                    {
                        var myFile = files[i];
                        double myFileLength = myFile.ContentLength / 1024.0 / 1024.0;
                        int InputMediaExcelLength = !string.IsNullOrEmpty(Global.GetAppString("InputMediaExcelLength")) ? int.Parse(Global.GetAppString("InputMediaExcelLength")) : ; 

                        if (myFileLength > InputMediaExcelLength)//超出指定大小
                        {
                            fc.IsSuccess = false; fc.Message = "为了保证数据处理效率，每次上传文件小于" + InputMediaExcelLength + "M,如超出请拆分记录分多次上传！";
                        }
                        else
                        {
                        //    string projectId = context.Request["projectId"];
                        //    string username = context.Request["username"];
                            if ((!Path.GetExtension(myFile.FileName).Contains("xls") && !Path.GetExtension(myFile.FileName).Contains("xlsx")))
                            {
                                functionBackMessage.IsSuccess = false; functionBackMessage.Message = "请上传Excel格式文件！";
                                return Json(functionBackMessage, "application/json");
                            }
                          //文件保存
                            string uploadPath = HttpContext.Current.Server.MapPath("/tempfile") + "\\";//服务器临时路径(不含文件名和后缀)
                            if (!Directory.Exists(uploadPath))
                            {
                                Directory.CreateDirectory(uploadPath);
                            }
                            string fileName = DateTime.Now.Ticks + "_" + myFile.FileName;
                            string fileFull = uploadPath + fileName;//文件路径,包含文件名和后缀

                            try
                            {

                                myFile.SaveAs(fileFull);//保存文件
                            }
                            catch (Exception ex)
                            {
                                com.log.Loger.Debug("uploadMediaSource 保存文件失败", ex);
                            }

                        }
                    }
                }
                else
                {
                    functionBackMessage.IsSuccess = false; functionBackMessage.Message = "没有获取到上传文件";
                }
            }
            return Json(functionBackMessage, "application/json");
        }
    }