jQuery插件ASP.NET应用之AjaxUpload
本次使用AJAXUPLOAD做为上传客户端无刷上传插件，其最新版本为3.9，官方地址：http://valums.com/ajax-upload/在页面中引入 jquery.min.1.4.2.js 和 ajaxupload.js
<script src="Scripts/jquery-1.4.2.min.js" type="text/javascript"></script><script src="Scripts/ajaxupload3.9.js" type="text/javascript"></script> HTML 代码：
<style type="text/css"> #txtFileName { width: 300px; } .btnsubmit{border-bottom: #cc4f00 1px solid; border-left: #ff9000 1px solid;border-top: #ff9000 1px solid; border-right: #cc4f00 1px solid;text-align: center; padding: 2px 10px; line-height: 16px; background: #e36b0f;height: 24px; color: #fff; font-size: 12px; cursor: pointer;} </style>上传图片：<input type="text" id="txtFileName" /><divid="btnUp" style="width:300px;" class=btnsubmit >浏览</div><div id="imglist"></div> js代 码：
<script type="text/javascript"> $(function () { var button = $('#btnUp'), interval; new AjaxUpload(button, { //action: 'upload-test.php',文件上传服务器端执行的地址 action: '/handler/AjaxuploadHandler.ashx', name: 'myfile', onSubmit: function (file, ext) { if (!(ext && /^(jpg|jpeg|JPG|JPEG)$/.test(ext))) { alert('图片格式不正确,请选择 jpg 格式的文件!', '系统提示'); return false; } // change button text, when user selects file button.text('上传中'); // If you want to allow uploading only 1 file at time, // you can disable upload button this.disable(); // Uploding -> Uploading. -> Uploading... interval = window.setInterval(function () { var text = button.text(); if (text.length < 10) { button.text(text + '|'); } else { button.text('上传中'); } }, 200); }, onComplete: function (file, response) { //file 本地文件名称，response 服务器端传回的信息 button.text('上传图片(只允许上传JPG格式的图片,大小不得大于150K)'); window.clearInterval(interval); // enable upload button this.enable(); var k = response.replace("<PRE>", "").replace("</PRE>", ""); if (k == '-1') { alert('您上传的文件太大啦!请不要超过150K'); } else { alert("服务器端传回的串："+k); alert("本地文件名称："+file); $("#txtFileName").val(k); $("<img />").appendTo($('#imglist')).attr("src", k); } } }); });</script> 服务器端 ajaxuploadhandler.ashx 代码
public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; HttpPostedFile postedFile = context.Request.Files; string savePath = "/upload/images/"; int filelength = postedFile.ContentLength; int fileSize = 163600; //150K string fileName = "-1"; //返回的上传后的文件名 if (filelength <= fileSize) { byte[] buffer = new byte; postedFile.InputStream.Read(buffer, 0, filelength); fileName = UploadImage(buffer, savePath, "jpg"); } context.Response.Write(fileName); } public static string UploadImage(byte[] imgBuffer, string uploadpath, string ext) { try { System.IO.MemoryStream m = new MemoryStream(imgBuffer); if (!Directory.Exists(HttpContext.Current.Server.MapPath(uploadpath))) Directory.CreateDirectory(HttpContext.Current.Server.MapPath(uploadpath)); string imgname = CreateIDCode() + "." + ext; string _path = HttpContext.Current.Server.MapPath(uploadpath) + imgname; Image img = Image.FromStream(m); if (ext == "jpg") img.Save(_path, System.Drawing.Imaging.ImageFormat.Jpeg); else img.Save(_path, System.Drawing.Imaging.ImageFormat.Gif); m.Close(); return uploadpath + imgname; } catch (Exception ex) { return ex.Message; } } public static string CreateIDCode() { DateTime Time1 = DateTime.Now.ToUniversalTime(); DateTime Time2 = Convert.ToDateTime("1970-01-01"); TimeSpan span = Time1 - Time2; //span就是两个日期之间的差额 string t = span.TotalMilliseconds.ToString("0"); return t; }
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