ajax上传文件错误405（method not allow）

 <form id= "uploadForm">    
      <p >指定文件名： <input type="text" name="filename" value= ""/></p >    
      <p >上传文件： <input type="file" name="file"/></ p>    
      <input type="button" value="上传" onclick="doUpload()" />    
</form>    

function doUpload() {    
     var formData = new FormData($( "#uploadForm" )[0]);    
     $.ajax({    
          url: 'http://localhost:8080/cfJAX_RS/rest/file/upload' ,    
          type: 'POST',    
          data: formData,    
          async: false,    
          cache: false,    
          contentType: false,    
          processData: false,    
          success: function (returndata) {    
              alert(returndata);    
          },    
          error: function (returndata) {    
              alert(returndata);    
          }    
     });    
}

想做一个无刷新上传但出了这个问题。

你那个地址不允许post请求，自己检查服务器配置

http://www.cnblogs.com/pinocchioatbeijing/articles/2375139.html

可算是解决了

 <body>
    <form id="uploadForm" name="uploadForm" enctype="multipart/form-data" >
        <input id="file" type="file" />
        <button id="upload" onclick="doUpload()" type="button">upload</button>
    </form>
</body>

     <script type="text/javascript">
        function doUpload() {
            var formData = new FormData();
            formData.append('file', $('#file')[0].files[0]);            
            $.ajax({
                url: 'Ashx/uploadFile.ashx',
                type: 'POST',
                cache: false,
                data: formData,
                processData: false,
                contentType: false
            }).done(function (res) {
                alert(res);
            }).fail(function (res) {
                alert(res);
            })
        }
    </script>

   public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            HttpFileCollection files = context.Request.Files;
            if (files.Count > 0)
            {
                foreach (string str in files)
                {
                    HttpPostedFile file = files[str];
                    string path = System.AppDomain.CurrentDomain.BaseDirectory + "uploadFiles\\" + file.FileName;
                    file.SaveAs(path);
                }
                context.Response.Write("上传成功");
            }
        }

在form表单中var formData = new FormData($( "#uploadForm" )[0]);
我不知道为什么formData获取不到文件，通过id的方式的却可以
希望哪位知道的可以告诉下我
$('#file')[0].files[0].size可以获取你file的大小,b为单位
保存文件时saveas时请映射到具体磁盘路径