各位大神 小弟跪求帮忙 急急！实现上传图片的功能 用jquery

之前回答过个类似的问题

是将canvas传到后台

js:

var data = _canvas.toDataURL(); 
    //删除字符串前的提示信息 "data:image/png;base64,"  
    var b64 = data.substring(22);  
   
    $.ajax({ url: "RotateCanvas.aspx", data: { data: b64, name: i.toString() }, success:  
            function ()  
            {  
              alert('OK');  
            }  
    });

java:

if (Request["name"] != null)  
{  
    string name = Request["name"];  
    String savePath = Server.MapPath("~/images/output/");  
   
    try  
    {  
        FileStream fs = File.Create(savePath + "/" + name + ".png");  
        byte[] bytes = Convert.FromBase64String(Request["data"]);  
   
        fs.Write(bytes, 0, bytes.Length);  
        fs.Close();  
    }  
    catch (Exception ex)  
    {  
    }  
}

如果你要用批量上传 最好用控件

jQuery.uploadify

  Upload Files | Clear Queue

    $(document).ready(function() {
        $('#fileInput').fileUpload({
            'uploader': 'Flash/uploader.swf',       //上传文件的进度条
            'script': 'UploadFileForm.aspx',         //上传文件的后台处理页面
            'cancelImg': 'Images/cancel.png',     //取消上传的图片
            'auto': false,
            'multi': true,
            'simUploadLimit': 3,                   //上传文件大小的限制
            'folder': '/UploadFiles',              //上传的文件夹
            'onComplete': function(event, queueID, fileObj, response, data) {             //上传完成后的操作
                alert(response);
            }
        });
    });


UploadFileForm.aspx.cs：
protected void Page_Load(object sender, EventArgs e)
        {
            try
            {
                Response.ContentType = "text/plain";
                Response.Charset = "utf-8";
                string strUploadPath = Request.PhysicalApplicationPath + Request.QueryString["folder"].Trim('/').Replace("/", "\\") + "\\";
                for (int i = 0; i < Request.Files.Count; i++)
                {
                    HttpPostedFile postedFile = Request.Files[i];
                    string fileName = strUploadPath + Path.GetFileName(postedFile.FileName);
                    if (fileName != "")
                    {
                        postedFile.SaveAs(fileName);
                    }
                }
                Response.Write("Upload The File Successfully!");
            }
            catch (Exception ex)
            {
                Response.ContentType = "text/plain";
                Response.Write(ex.Message);
            }
            finally
            {
                Response.Flush();
                Response.End();
            }
        }

你可以百度下 SWFUpload 下载里面的例子,下载下来看下肯定会. 我只有CI框架的SWFUpload例子.