Html 5は微信の制限を突破して大きいファイルの分割のアップロードを実現します

    
    
    
    

        var page = {
            init: function () {
                $("#subUpload").click($.proxy(this.upload, this));
            },
            upload: function () {
                var file = $("#fileUpload")[0].files[0],  //    
                    name = file.name,        //   
                    size = file.size,        //   
                    succeed = 0;
                var shardSize = 290 * 1024,    // 290kb     ,  1MB=1 * 1024 * 1024
                    shardCount = Math.ceil(size / shardSize);  //   
                for (var i = 0; i < shardCount; ++i) {
                    //             
                    var start = i * shardSize,
                        end = Math.min(size, start + shardSize);
                    //      ，FormData HTML5   
                    var form = new FormData();
                    form.append("data", file.slice(start, end));  //slice            
                    form.append("name", name);
                    form.append("total", shardCount);  //   
                    form.append("index", i + 1);        //      
                    //Ajax  
                    $.ajax({
                        url: "../Upload/SaveFile2",
                        type: "POST",
                        data: form,
                        async: true,        //  
                        processData: false,  //   ，  jquery   form    
                        contentType: false,  //   ，   false       Content-Type
                        success: function () {
                            ++succeed;
                            $("#output").text(succeed + " / " + shardCount);
                        }
                    });
                }
            }
        };

        $(function () {
            page.init();
        });

    


    

        

          

          
    

        public ActionResult SaveFile2()
        {
            string name = Request["name"];
            int total = Convert.ToInt32(Request["total"]);
            int index = Convert.ToInt32(Request["index"]);
            var data = Request.Files["data"];
            string dir = Server.MapPath("/UploadFile/Imgs/");
            if (!Directory.Exists(dir))
            {
                Directory.CreateDirectory(dir);
            }
            string file = Path.Combine(dir, name + "_" + index);
            data.SaveAs(file);

            string[] files = Directory.GetFiles(dir);
            bool isMerge = true;
            for (int i = 1; i <= total; ++i)
            {
                string part = Path.Combine(dir, name + "_" + i);
                if (!files.Contains(part))
                {
                    isMerge = false;
                }
            }

            if (isMerge)
            {
                file = Path.Combine(dir, name);
                var fs = new FileStream(file, FileMode.Create);
                try {
                    for (int i = 1; i <= total; ++i)
                    {
                        string part = Path.Combine(dir, name + "_" + i);
                        var bytes = System.IO.File.ReadAllBytes(part);
                        fs.Write(bytes, 0, bytes.Length);
                        bytes = null;
                        System.IO.File.Delete(part);
                    }
                }
                finally
                {
                    fs.Close();
                }
            }
            //      ，        

            return Json(new { Error = 0 });
        }