asp.net使用H5新特性实现异步上传的示例

2020-11-27 来源：爱问旅游网

###index.html

<!DOCTYPE html>
<html>
<head>
 <meta charset="utf-8" />
 <script src="Script/jquery-1.10.2.min.js"></script>
 <script src="Script/index.js"></script>
 <title></title>
 <script type="text/javascript">
 $(function(){
 $("#ajaxFileUpload").click(function () {
 formDataUpload();
 });
 });
 </script>
</head>
<body>
 <input type="file" id="FileToUpload" multiple="multiple" mame="FileToUpload" />
 <input type="button" id="ajaxFileUpload" value="上传"/>
 <input type="text" size="10"/>
</body>
</html>

###index.js

function formDataUpload() {
 //这里可以一次性选中多个文件
 var fileUpload = document.getElementById("FileToUpload").files;
 if (fileUpload.length == 0) {
 alert("请选中文件再上传");
 return;
 }
 //html5新特性
 var formdata = new FormData();
 //添加上传数据
 for (var i = 0; i < fileUpload.length;i++){
 formdata.append('files', fileUpload[i]);
 }

 //使用javascript的原生ajax
 var xmlHttp = new XMLHttpRequest();
 xmlHttp.open("post", 'Handler.ashx?method=formDataUpload');
 xmlHttp.onreadystatechange = function () {
 if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
 alert("上传成功");
 }
 }
 xmlHttp.send(formdata);
}

###handler.ashx

<%@ WebHandler Language="C#" Class="Handler" %>
using System;
using System.Web;
public class Handler : IHttpHandler {
 
 public void ProcessRequest (HttpContext context) {
 formDataUpload(context);
 }
 public static void formDataUpload(HttpContext context) {
 //获取到客户端提交的文件
 HttpFileCollection files = context.Request.Files;
 string msg = string.Empty;
 string error = string.Empty;
 int fileM = 0;
 if (files.Count > 0) {
 for (int i = 0; i < files.Count; i++) { ;
 String path = @"D:\"+files[i].FileName;
 files[i].SaveAs(path);
 fileM += files[i].ContentLength;
 }
 msg = "上传成功，文件总大小:" + fileM;
 string res = "{error :'" + error + "',msg:'" + msg + "'}";
 context.Response.Write(res);
 context.Response.End();
 }
 }
 public bool IsReusable {
 get {
 return false;
 }
 }
}

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asp.net使用H5新特性实现异步上传的示例