公司用AppCan开发了手机App，需用将手机拍摄的视频传到服务器，当视频较大是App会异常退出，于是想到通过将视频文件进行分割成小块进行传输，实现代码如下：
前台HTML代码
1 <html> 2 <head> 3 <title>大文件分割上传</title> 4 <script type="text/javascript" src="Scripts/jquery-3.2.1.min.js"></script> 5 <script type="text/javascript"> 6 7 var page = { 8 init: function () { 9 $("#subUpload").click($.proxy(this.upload, this)); 10 }, 11 upload: function () { 12 var file = $("#fileUpload")[0].files[0], //文件对象 13 name = file.name, //文件名 14 size = file.size, //总大小 15 succeed = 0; 16 var shardSize = 1024 * 1024, //换算1MB=1 * 1024 * 1024 17 shardCount = Math.ceil(size / shardSize); //总片数 18 for (var i = 0; i < shardCount; ++i) { 19 //计算每一片的起始与结束位置 20 var start = i * shardSize, 21 end = Math.min(size, start + shardSize); 22 //构造一个表单，FormData是HTML5新增的 23 var form = new FormData(); 24 form.append("data", file.slice(start, end)); //slice方法用于切出文件的一部分 25 form.append("name", name); 26 form.append("total", shardCount); //总片数 27 form.append("index", i + 1); //当前是第几片 28 //Ajax提交 29 $.ajax({ 30 url: "Account/UploadFile", 31 type: "POST", 32 data: form, 33 async: true, //异步 34 processData: false, //很重要，告诉jquery不要对form进行处理 35 contentType: false, //很重要，指定为false才能形成正确的Content-Type 36 success: function () { 37 ++succeed; 38 $("#output").text(succeed + " / " + shardCount); 39 } 40 }); 41 } 42 } 43 }; 44 45 $(function () { 46 page.init(); 47 }); 48 49 </script> 50 </head> 51 <body> 52 <div> 53 <input id="fileUpload" name="fileUpload" type="file" /><br /> 54 <button id="subUpload" type="submit">提交</button><br /> 55 <span id="output" style="font-size:12px">等待</span> 56 </div> 57 </body> 58 </html>
后台C#代码
1 /// <summary> 2 /// 文件接受 3 /// </summary> 4 /// <returns></returns> 5 public ActionResult UploadFile() 6 { 7 string name = Request["name"]; 8 int total = Convert.ToInt32(Request["total"]); 9 int index = Convert.ToInt32(Request["index"]); 10 var data = Request.Files["data"]; 11 string dir = Server.MapPath("/UploadFile/"); 12 if (!Directory.Exists(dir)) 13 { 14 Directory.CreateDirectory(dir); 15 } 16 string file = Path.Combine(dir, name + "_" + index); 17 data.SaveAs(file); 18 19 string[] files = Directory.GetFiles(dir); 20 bool isMerge = true; 21 for (int i = 1; i <= total; ++i) 22 { 23 string part = Path.Combine(dir, name + "_" + i); 24 if (!files.Contains(part)) 25 { 26 isMerge = false; 27 break; 28 } 29 } 30 31 if (isMerge) 32 { 33 file = Path.Combine(dir, name); 34 var fs = new FileStream(file, FileMode.Create); 35 try 36 { 37 for (int i = 1; i <= total; ++i) 38 { 39 string part = Path.Combine(dir, name + "_" + i); 40 var bytes = System.IO.File.ReadAllBytes(part); 41 fs.Write(bytes, 0, bytes.Length); 42 bytes = null; 43 System.IO.File.Delete(part); 44 } 45 } 46 catch // (Exception e) 47 { 48 //记录错误日志 49 //log4net.log(e.ToString()); 50 // 51 return Json(new { success = 0, msg = "上传完成，但合并文件时失败！" }); 52 } 53 finally 54 { 55 fs.Close(); 56 } 57 } 58 // 59 return Json(new { success = 1,msg="上传成功" }); 60 }
