<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 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>

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; //150K            string 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);                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;        }

<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;}

//upload resumenew AjaxUpload('resume', {    // Location of the server-side upload script  // NOTE: You are not allowed to upload files to another domain    action: '../resources/Reg1C/upload',    // File upload name   name: 'resume', // Fired after the file is selected   // Useful when autoSubmit is disabled // You can return false to cancel upload  // @param file basename of uploaded file // @param extension of that file onChange: function (file, extension) { }, // Fired before the file is uploaded  // You can return false to cancel upload  // @param file basename of uploaded file // @param extension of that file onSubmit: function (file, extension)  {     if (!(extension && /^(doc|docx|pdf)$/i.test(extension)))      {         // extension is not allowed           alert('Error: invalid file extension');         // cancel upload          return false;     }     // allow only 1 upload        //this.disable(); },    // Fired when file upload is completed    // WARNING! DO NOT USE "FALSE" STRING AS A RESPONSE!    // @param file basename of uploaded file // @param response server response   onComplete: function (file, response) {     if ($(response).find("isSuccess").text() == "false")        {         alert($(response).find("msg").text());          if ($(response).find("id").text() == "-1")          {             window.location.href = "../Home/index.jsp";            }         return;       }     else      {         $("#uploadMsg").html(file + " is uploaded!");        } }});

@POST@Path("upload")@Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})    public ResponseVO upload() throws IOException {ResponseVO responseVO = new ResponseVO();Integer userId = SessionStoreManager.getUserId(request);if (userId == null) {responseVO.setId(ResponseVO.HOME_ALERT);responseVO.setMsg("Your session is time out!");return responseVO;}try {// Create a factory for disk-based file itemsFileItemFactory factory = new DiskFileItemFactory();// Create a new file upload handlerServletFileUpload upload = new ServletFileUpload(factory);// Parse the requestList<FileItem> items = upload.parseRequest(request);

// Process the uploaded itemsIterator<FileItem> iter = items.iterator();while (iter.hasNext()) {FileItem item = iter.next();// Process a file uploadif (!item.isFormField()) {String fileName = item.getName();//comment out for .docx type will get a too long stringString contentType = item.getContentType();if (!(Resume.PDF_CONTENT_TYPE.equals(contentType)|| Resume.DOC_CONTENT_TYPE.equals(contentType)|| Resume.DOCX_CONTENT_TYPE.equals(contentType))) {responseVO.setIsSuccess(false);responseVO.setMsg("MS Word or PDF files only.");return responseVO;}long sizeInBytes = item.getSize();if (sizeInBytes > Constants.MAX_RESUME_SIZE) {responseVO.setIsSuccess(false);responseVO.setMsg("Error uploading the resume file. Resume file size must be less than 1M.");return responseVO;}byte[] data = item.get();//Expert entityExpert = em.find(Expert.class, userId);Resume entityResume = em.find(Resume.class, userId);if (entityResume == null) {entityResume = new Resume();entityResume.setId(userId);em.persist(entityResume);}entityResume.setContent(data);entityResume.setContentType(contentType);

responseVO.setIsSuccess(true);responseVO.setMsg("Upload sucess!" + item.getContentType());}}} catch (Exception e) {responseVO.setIsSuccess(false);responseVO.setMsg("Upload failed!");}

return responseVO;}