1.前言
文件导入导出是简单且常用的功能,以下示例实现了文件上传与下载的几种方法,如有不妥的地方,欢迎指正。小白一枚,在往目标前进。
2.1.文件上传 -- 纯文件
1 <form action="/Home/Index" method ="post" enctype="multipart/form-data" >
2 <input type="file" multiple/>
3 <input id="upload" type="submit" />
4 </form>
1 [HttpPost]
2 public IActionResult Index(List<IFormFile> files)
3 {
4 5 foreach (var file in files)
6 {
7 //获取文件名
8 var fileName = file.FileName;
9 //保存在wwwroot文件夹下
10 fileName = hostingEnv.WebRootPath + $"\\{fileName}";12 using (FileStream fs = System.IO.File.Create(fileName))
13 {
14 file.CopyTo(fs);
15 fs.Flush();
16 }
17 }
18 return View();
19 }
2.2.文件上传 -- 多类型内容上传
对于这种不只有文件的表单,可以采用模型绑定的方式。
<form action="/Home/Index" method ="post" enctype="multipart/form-data" >
<input type="file" multiple/>
<input type="text" name="Name"/>
<input id="upload" type="submit" />
</form>
/// <summary>
/// 表单上传文件
/// </summary>
/// <param name="files"></param>
/// <returns></returns>
[HttpPost]
public IActionResult Index(FormObject obj)
{
foreach (var file in obj.Files)
{
//获取文件名
var fileName = ContentDispositionHeaderValue
.Parse(file.ContentDisposition)
.FileName
.Trim('"');
fileName = hostingEnv.WebRootPath + $"\\{fileName}";
using (FileStream fs = System.IO.File.Create(fileName))
{
file.CopyTo(fs);
fs.Flush();
}
}
return View();
}
//模型类
public class FormObject
{
public List<IFormFile> Files{ get; set; }
public string Name { get; set; }
}
2.3.文件上传 -- Ajax上传
<input type="text" name="Name" value="123"/>
<input type="file" id="fileUpload" name="fileUpload" multiple/>
<input id="upload" type="button" value="ajax 提交"/>
<script type="text/javascript">
$(function () {
$("#upload").click(function (evt) {
///取选择的文件加入FormData中
var fileUpload = $("#fileUpload").get(0);
var files = fileUpload.files;
var data = new FormData();
for (var i = 0; i < files.length; i++) {
data.append(files[i].name, files[i]);
}
// data.append("Name", $('input[name="Name"]').val())
$.ajax({
type: "POST",
url: "http://192.168.0.175:8095/api/Organization",
contentType: false,
processData: false,
data: data,
success: function (message) {
alert(message);
},
error: function () {
alert("上传文件出现错误!");
}
});
});
});
</script>
/// <summary>
/// 通过ajax上传
/// </summary>
/// <returns></returns>
public IActionResult UploadFiles()
{var files = Request.Form.Files;
var value =Request.Form.First(c => c.Key == "Name").Value;//获得表单文本项
foreach (var file in files)
{
var fileName = file.FileName;
fileName = hostingEnv.WebRootPath + $@"\{fileName}";using (FileStream fs = System.IO.File.Create(fileName))
{
file.CopyTo(fs);
fs.Flush();
}
}
return RedirectToAction("/Export", new { Title ="1",Name = 123});
}
3.3.文件下载
1 [HttpGet]
2 public IActionResult ExportText()
3 {
4
5 string sFileName = $@"qmhuangtext{DateTime.Now.ToString("yyyyMMddHHmmss")}.txt";
6 FileStream fs =new FileStream(sFileName,FileMode.OpenOrCreate);
7 StreamWriter sw = new StreamWriter(fs);
8 sw.WriteLine("Hello world");
9 sw.Flush();
10 sw.Close();
11 fs.Close();
12 return File(new FileStream(sFileName, FileMode.Open), "application/octet-stream", $"导出测试{DateTime.Now.ToString("yyyyMMddHHmmss")}.txt");
13 }