asp.net利用ashx文件实现文件的上传功能

2020-01-17 20:30:03

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原来以为文件上传是一个比较简单的功能，结果搞了一个晚上才搞定~这里主要介绍两种方法实现。

方法一：Form表单提交

html代码：

<!DOCTYPE html><html><head>  <meta charset="utf-8" />  <title>上传文件</title>  <script src="Scripts/jquery-1.11.3.min.js"></script></head><body>  <form action="UploadHandler.ashx" method="post" enctype="multipart/form-data">    <input id="file_upload" name="file_upload" type="file" />    <input id="btn_upload" type="submit" value="上传" />  </form></body></html>

UploadHandler.ashx代码：

using System;using System.Collections.Generic;using System.Linq;using System.Web;namespace WebApplication1{  /// <summary>  /// UploadHandler 的摘要说明  /// </summary>  public class UploadHandler : IHttpHandler  {    public void ProcessRequest(HttpContext context)    {      context.Response.ContentType = "text/plain";      HttpPostedFile file = context.Request.Files["file_upload"];      string filePath = context.Server.MapPath("~/UploadFiles/") + System.IO.Path.GetFileName(file.FileName);      file.SaveAs(filePath);      context.Response.Write("上传文件成功");    }    public bool IsReusable    {      get      {        return false;      }    }  }}

该方法虽然能够实现文件的上传，但是form表单提交之后整个页面就刷新了，如果要无刷新上传文件的话，就要使用ajax了。

方法二：jquery + ajax无刷上传

html代码：

<!DOCTYPE html><html><head>  <meta charset="utf-8" />  <title>上传文件</title>  <script src="Scripts/jquery-1.11.3.min.js"></script></head><body>  <input id="file_upload" name="file_upload" type="file" />  <input id="btn_upload" type="button" value="上传" />  <script>    $(document).ready(function ()    {      $('#btn_upload').bind('click', function ()      {        var formData = new FormData();        formData.append('upload_file', $('#file_upload')[0].files[0]);        $.ajax({          url: 'UploadHandler.ashx',          type: 'post',          data: formData,          contentType: false,          processData: false,          success: function (msg)          {            if (msg == "Yes")            {              alert('文件上传成功');            }            else            {              alert('文件上传失败');            }          }        })      });    });  </script></body></html>

UploadHandler.ashx代码：

using System;using System.Collections.Generic;using System.Linq;using System.Web;namespace WebApplication1{  /// <summary>  /// UploadHandler 的摘要说明  /// </summary>  public class UploadHandler : IHttpHandler  {    public void ProcessRequest(HttpContext context)    {      context.Response.ContentType = "text/plain";      if (context.Request.Files.Count > 0)      {        HttpPostedFile file = context.Request.Files["upload_file"];        string filePath = context.Server.MapPath("~/UploadFiles/") + System.IO.Path.GetFileName(file.FileName);        file.SaveAs(filePath);        context.Response.Write("Yes");      }      else      {        context.Response.Write("No");      }    }    public bool IsReusable    {      get      {        return false;      }    }  }}

个人更推荐方法二，运行结果如下图所示：