jQuery AjaxUpload 上传图片代码

<script src="Scripts/jquery-1.4.2.min.js" type="text/javascript"></script><script src="Scripts/ajaxupload3.9.js" type="text/javascript"></script>

<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" /><div id="btnUp" style="width:300px;" class=btnsubmit >浏览</div><div id="imglist"></div>

<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 filebutton.text('上传中');// If you want to allow uploading only 1 file at time,// you can disable upload buttonthis.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 buttonthis.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> 

public void ProcessRequest(HttpContext context){context.Response.ContentType = "text/plain";HttpPostedFile postedFile = context.Request.Files[0];string savePath = "/upload/images/";int filelength = postedFile.ContentLength;int fileSize = 163600; //150Kstring fileName = "-1"; //返回的上传后的文件名if (filelength <= fileSize){byte[] buffer = new byte[filelength];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);elseimg.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;}

<script src="js/jquery-1.3.js"></script><script src="js/ajaxupload.3.5.js"></script> 

<ul> <li id="example"> <div id="upload_button">文件上传</div><p>已上传的文件列表:</p> <ol class="files"></ol></ul> 

$(document).ready(function(){var button = $('#upload_button'), interval;var fileType = "all",fileNum = "one"; new AjaxUpload(button,{action: 'do/uploadfile.php',/*data:{'buttoninfo':button.text()},*/name: 'userfile',onSubmit : function(file, ext){if(fileType == "pic"){if (ext && /^(jpg|png|jpeg|gif)$/.test(ext)){this.setData({'info': '文件类型为图片'});} else {$('<li></li>').appendTo('#example .files').text('非图片类型文件，请重传');return false; }}button.text('文件上传中');if(fileNum == 'one')this.disable();interval = window.setInterval(function(){var text = button.text();if (text.length < 14){button.text(text + '.'); } else {button.text('文件上传中'); }}, 200);},onComplete: function(file, response){if(response != "success")alert(response);button.text('文件上传');window.clearInterval(interval);this.enable();if(response == "success");$('<li></li>').appendTo('#example .files').text(file); }});}); 

<input type="file" name="userfile"> 

$upload_dir = '../file/';$file_path = $upload_dir . $_FILES['userfile']['name'];$MAX_SIZE = 20000000;echo $_POST['buttoninfo'];if(!is_dir($upload_dir)){if(!mkdir($upload_dir))echo "文件上传目录不存在并且无法创建文件上传目录";if(!chmod($upload_dir,0755))echo "文件上传目录的权限无法设定为可读可写";}if($_FILES['userfile']['size']>$MAX_SIZE)echo "上传的文件大小超过了规定大小";if($_FILES['userfile']['size'] == 0)echo "请选择上传的文件";if(!move_uploaded_file( $_FILES['userfile']['tmp_name'], $file_path))echo "复制文件失败，请重新上传"; switch($_FILES['userfile']['error']){case 0:echo "success" ;break;case 1:echo "上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值";break;case 2:echo "上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值";break;case 3:echo "文件只有部分被上传";break;case 4:echo "没有文件被上传";break;}