前几天朋友说用js上传图片过去遇到点问题，于是自己也想写一个demo这里就把自己挖的坑填了。
话不多说上代码
前台就一个file控件加按钮
<!DOCTYPE html>
<html> <head>
<meta charset="UTF-8">
<title></title>
<script src="scripts/jquery-1.9.1.min.js"></script>
</head> <body>
<input type="file" name="file" id="testFile" nultiple="multiple" />
<input type="button" id="btnSend" value="上传" onclick="UploadFile()" /> <script>
function UploadFile() {
var formData = new FormData();
jQuery.support.cors = true;
var file = $("#testFile")[0].files[0];
formData.append("file", file);
$.ajax({
type: "post",
url: "./api/file/FileByAsyncTask",
data: formData,
async: false,
/**
*必须false才会自动加上正确的Content-Type
*/
contentType: false,
/**
* 必须false才会避开jQuery对 formdata 的默认处理
* XMLHttpRequest会对 formdata 进行正确的处理
*/
processData: false,
success: function (data) {
console.log(data);
},
error: function (data) {
console.log(data.statusText);
}
});
}
</script>
</body>
</html>
这里需要注意的就是在发送文件的时候需要使用FormData进行传递
后台代码（用了三种方式处理）
public class FileController : ApiController
{
TimeSpan tspan = DateTime.Now - new DateTime(, , ); /// <summary>
/// 图片上传接口
/// </summary>
/// <returns></returns>
[HttpPost]
public HttpResponseMessage FileUpload()
{
if (!Request.Content.IsMimeMultipartContent("form-data"))
throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
HttpResponseMessage response = new HttpResponseMessage();
try
{
HttpPostedFile file = HttpContext.Current.Request.Files["file"];//获取http传输的文件
string domainPath = HttpRuntime.AppDomainAppPath.ToString();//物理路径 二选一
string serverPath = System.Web.Hosting.HostingEnvironment.MapPath("~/images/img/");//物理路径
string ext = Path.GetExtension(file.FileName);//获取扩展名
string newName = tspan.TotalMilliseconds + ext;//时间戳+扩展名形成新文件名 //方式一 直接保存上传文件
//FileByHttpPostedFile(file,serverPath,tspan.TotalMilliseconds+ext); //方式二 图片流处理
//ImageByStream(file, serverPath, newName); //方式三 先创建文件在移动到指定目录 response.Headers.Add("Access-Control-Allow-Origin", "*");
response.Headers.Add("Access-Control-Alow-Method", "post");
response.Headers.Add("Access-Control-Allow-Headers", "Content-Type");
response.Headers.Add("Access-Control-Max", "");
return response;
}
catch (Exception e)
{
throw e;
}
} /// <summary>
/// 方法一 通过HttpPostedFile保存
/// </summary>
/// <param name="file">Http接收到的文件</param>
/// <param name="savePath">保存地址</param>
/// <param name="filename">文件名</param>
public void FileByHttpPostedFile(HttpPostedFile file, string serverPath, string fileName)
{
file.SaveAs(serverPath + fileName);
} public void ImageByStream(HttpPostedFile file, string serverPath, string fileName)
{
using (Image img = Bitmap.FromStream(file.InputStream))
{
img.Save(serverPath + fileName);
}
} /// <summary>
/// 异步上传
/// </summary>
/// <param name="postFile"></param>
/// <returns></returns>
[HttpPost]
public async Task<bool> FileByAsyncTask()
{
if (!(HttpContext.Current.Request.Files.Count > ))//判断是否文件
return false;
HttpPostedFile postFile = HttpContext.Current.Request.Files["file"];//获取文件
string serverPath = System.Web.Hosting.HostingEnvironment.MapPath("~/images/img/");//获取服务器地址
var provider = new MultipartFormDataStreamProvider(serverPath);//创建MIME 多部分正文新实例
IEnumerable<HttpContent> parts = null;
Task.Factory.StartNew(() =>
{
parts = Request.Content.ReadAsMultipartAsync(provider).Result.Contents;//异步获取多部分正文内容
},CancellationToken.None,
TaskCreationOptions.LongRunning,
TaskScheduler.Default).Wait();
foreach (var file in provider.FileData)//文件保存
{
FileInfo _fileInfo = new FileInfo(file.LocalFileName);
var fileName = file.Headers.ContentDisposition.FileName.Replace("\"","");//从内容读取文件名
string _ext = Path.GetExtension(fileName);//content获取文件名是 \"header.jpg\" 函数识别字符串 header.jpg所以需要去掉双引号
string _savePath = Path.Combine(serverPath + tspan.TotalMilliseconds + _ext);
_fileInfo.MoveTo(_savePath);
}
return true;
}
}
比较菜，希望以后继续努力