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上传功能

作者:佚名      ASP.NET网站开发编辑:admin      更新时间:2022-07-23

上传功能

今天是八一节,打起精神,看看园子,发现吴大神的帖子,觉好,转来收藏一下。出处:http://www.cnblogs.com/wu-jian/。也谢谢大神的分享 ^_^.

//前台注册控件
<%@ Register Assembly="MattBerseth.WebControls.Ajax" Namespace="MattBerseth.WebControls.AJAX.PRogress" TagPrefix="mb" %>

然后前台代码(包括JS)


<head id="Head1" runat="server">    <title>Untitled Page</title>    <link href="../App_Themes/CSS/progress.css" rel="stylesheet" type="text/css" />    <link href="../App_Themes/css/upload.css" rel="stylesheet" type="text/css" />    <script src="../App_Themes/JS/jquery.js" type="text/javascript"></script>    <script language="Javascript" type="text/javascript">        var intervalID = 0;        var progressBar;        var fileUpload;        var form;        // 进度条              function pageLoad() {            $addHandler($get('upload'), 'click', onUploadClick);            progressBar = $find('progress');        }        // 注册表单               function register(form, fileUpload) {            this.form = form;            this.fileUpload = fileUpload;        }        //上传验证        function onUploadClick() {            var vaild = fileUpload.value.length > 0;            if (vaild) {                $get('upload').disabled = 'disabled';                updateMessage('info', '初始化上传...');                //提交上传                form.submit();                // 隐藏frame                Sys.UI.DomElement.addCssClass($get('uploadFrame'), 'hidden');                // 0开始显示进度条                progressBar.set_percentage(0);                progressBar.show();                // 上传过程                intervalID = window.setInterval(function () {                    PageMethods.GetUploadStatus(function (result) {                        if (result) {                            //  更新进度条为新值                            progressBar.set_percentage(result.percentComplete);                            //更新信息                            updateMessage('info', result.message);                            if (result == 100) {                                // 自动消失                                window.clearInterval(intervalID);                            }                        }                    });                }, 500);            }            else {                onComplete('error', '您必需选择一个文件');            }        }        function onComplete(type, msg) {            // 自动消失            window.clearInterval(intervalID);            // 显示消息            updateMessage(type, msg);            // 隐藏进度条            progressBar.hide();            progressBar.set_percentage(0);            // 重新启用按钮            $get('upload').disabled = '';            //  显示frame            Sys.UI.DomElement.removeCssClass($get('uploadFrame'), 'hidden');        }        function updateMessage(type, value) {            var status = $get('status');            status.innerHTML = value;            // 移除样式            status.className = '';            Sys.UI.DomElement.addCssClass(status, type);        }    </script>    <style type="text/css">        BODY{ font-family:Arial, Sans-Serif; font-size:12px;}    </style></head><body>    <form id="form1" runat="server">    <asp:ScriptManager ID="scriptManager" runat="server" EnablePageMethods="true" />    <div>        <div class="upload">            <h3>文件上传</h3>            <div>                <iframe id="uploadFrame" frameborder="0" scrolling="no" src="Upload.aspx"></iframe>                <mb:ProgressControl ID="progress" runat="server" CssClass="lightblue" style="display:none" Value="0" Mode="Manual" Speed=".4" Width="100%" />                <div>                    <div id="status" class="info">请选择要上传的文件</div>                    <div class="commands">                        <input id="upload" type="button" value="上传" />                     </div>                </div>            </div>        </div>           </div>    </form></body>

后台:


protected void Page_Load(object sender, EventArgs args)    {        if (!this.IsPostBack)        {            this.session["UploadInfo"] = new UploadInfo { IsReady = false };        }    }    /// <summary>    ///     /// </summary>    [System.Web.Services.WebMethod]    [System.Web.Script.Services.ScriptMethod]    public static object GetUploadStatus()    {        //获取文件长度        UploadInfo info = HttpContext.Current.Session["UploadInfo"] as UploadInfo;        if (info != null && info.IsReady)        {            int soFar = info.UploadedLength;            int total = info.ContentLength;            int percentComplete = (int)Math.Ceiling((double)soFar / (double)total * 100);            string message = string.Format("上传 {0} ... {1} of {2} 字节", info.FileName, soFar, total);            //  返回百分比            return new { percentComplete = percentComplete, message = message };        }        //  还没有准备好...        return null;    }

UploadInfo.cs 类:


using System;using System.Data;using System.Configuration;using System.Linq;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.HtmlControls;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.xml.Linq;public class UploadInfo{    public bool IsReady { get; set; }    public int ContentLength { get; set; }    public int UploadedLength { get; set; }    public string FileName { get; set; }}

还有就是一个页:


<%@ Page Language="C#" EnableSessionState="ReadOnly" Async="true" %><%@ Import Namespace="System.IO"  %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server">    <title>Untitled Page</title>    <script runat="server">        //限制大小 1M        protected void Page_Load2(object sender, EventArgs e)        {            if (this.IsPostBack)            {                UploadInfo uploadInfo = this.Session["UploadInfo"] as UploadInfo;                if (uploadInfo == null)                {                    // 让父页面知道无法处理上传                    const string js = "window.parent.onComplete('error', '无法上传文件。请刷新页面,然后再试一次);";                    ScriptManager.RegisterStartupScript(this, typeof(jindutiao_upload_aspx), "progress", js, true);                }                else                {                    //  让服务端知道我们还没有准备好..                    uploadInfo.IsReady = false;                    //  上传验证                    if (this.fileUpload.PostedFile != null && this.fileUpload.PostedFile.ContentLength > 0                        && this.fileUpload.PostedFile.ContentLength < 1048576)//  限制1M                    {                        //  设置路径                        string path = this.Server.MapPath(@"~/Uploads");                        string fileName = Path.GetFileName(this.fileUpload.PostedFile.FileName);                        // 上传信息                        uploadInfo.ContentLength = this.fileUpload.PostedFile.ContentLength;                        uploadInfo.FileName = fileName;                        uploadInfo.UploadedLength = 0;                       //文件存在 初始化...                        uploadInfo.IsReady = true;                       //缓存                        int bufferSize = 1;                        byte[] buffer = new byte[bufferSize];                        // 保存字节                        using (FileStream fs = new FileStream(Path.Combine(path, fileName), FileMode.Create))                        {                                                     while (uploadInfo.UploadedLength < uploadInfo.ContentLength)                            {                               //从输入流放进缓冲区                                int bytes = this.fileUpload.PostedFile.InputStream.Read(buffer, 0, bufferSize);                                // 字节写入文件流                                fs.Write(buffer, 0, bytes);                                //  更新大小