WebClient 上传下载用法

今天学习了一下WebClient的上传、下载。

具体用法如下。 我们先在IIS网站中建立一个文件夹，此处为"Mp3"，并设置此文件夹相关读写权限。

例1：使用WebClient中的UploadFile方法上传文件。代码如下。使用此方法需要将上传的文件夹权限设置为IIS来宾账户允许读写。

        const string UploadFilePath = "http://localhost/Mp3/";
        /// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnUpload_Click(object sender, EventArgs e)
        {
            try
            {
                WebClient client = new WebClient();
                string uploadFilePath = UploadFilePath + DateTime.Now.ToString("yyMMddHHmmssff") + ".txt";
                /*
                 * PUT:如果文件名在客户端确定，就使用PUT
                 * POST:如果文件名在服务器端确定，就使用POST
                 */
                client.UploadFile(uploadFilePath, "PUT", txbFile.Text);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

 例2：使用WebClient的UpLoadData上传文件

        /// <summary>
        /// 上传文件 使用UploadData
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                string uploadFilePath = UploadTestFilePath + DateTime.Now.ToString("yyMMddHHmmssff") + ".txt";
                WebClient client = new WebClient();
                FileStream fStream = new FileStream(txbFile.Text, FileMode.Open, FileAccess.Read);
                BinaryReader bReader = new BinaryReader(fStream);
                byte[] uploadByte = bReader.ReadBytes(Convert.ToInt32(fStream.Length));
           
                try
                {
                    byte[] responseArray = client.UploadData(uploadFilePath, "PUT", uploadByte);
                    string returnValue = Encoding.GetEncoding("gb2312").GetString(responseArray);
                }
                catch (Exception ex)
                {

                    throw ex;
                }
                finally
                {

                    fStream.Close();
                    fStream.Dispose();
                    client.Dispose();
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

例3：使用WebClient的Write方法上传。 

        /// <summary>
        /// 上传(Stream)
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_Click(object sender, EventArgs e)
        {
            try
            {
                string uploadFilePath = UploadTestFilePath + DateTime.Now.ToString("yyMMddHHmmssff") + ".txt";
                WebClient client = new WebClient();
                client.UseDefaultCredentials = true;
                client.Credentials = CredentialCache.DefaultCredentials;
                FileStream fStream = new FileStream(txbFile.Text, FileMode.Open, FileAccess.Read);
                BinaryReader bReader = new BinaryReader(fStream);
                byte[] uploadByte = bReader.ReadBytes(Convert.ToInt32(fStream.Length));
                Stream uploadStream = client.OpenWrite(uploadFilePath, "PUT");
                try
                {
                    if (uploadStream.CanWrite)
                    {
                        uploadStream.Write(uploadByte, 0, uploadByte.Length);
                    }
                }
                catch (Exception ex)
                {

                    throw ex;
                }
                finally
                {

                    fStream.Close();
                    fStream.Dispose();
                    uploadStream.Close();
                    uploadStream.Dispose();
                    client.Dispose();
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

例4：打开文件，不需要验证。此处使用的是匿名账户。

        /// <summary>
        /// 打开文件 无授权
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnOpen_Click(object sender, EventArgs e)
        {
            string serverFilePath = "http://localhost/Mp3/11060715414724.txt";
            WebClient client = new WebClient();
            Stream stream = client.OpenRead(serverFilePath);
            StreamReader reader = new StreamReader(stream);
            rtbData.Text = reader.ReadToEnd();
        }

 例5：使用本地账户验证。

此处需要将IIS网站授权勾选成“集成widdows验证”。

        /// <summary>
        /// 自定义授权
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            WebClient client = new WebClient();
            NetworkCredential credential = new NetworkCredential(@"ckt", "ckt");
            client.Credentials = credential;
            string serverFilePath = "http://localhost/Mp3/11060715414724.txt";
            Stream stream = client.OpenRead(serverFilePath);
            StreamReader reader = new StreamReader(stream);
            rtbData.Text = reader.ReadToEnd();            
        }

例6：下载文件

        /// <summary>
        /// 下载文件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnDownload_Click(object sender, EventArgs e)
        {
            try
            {
                WebClient client = new WebClient();
                string serverFile = "http://localhost/Mp3/11060715414724.txt";
                WebRequest request = WebRequest.Create(serverFile);
                client.DownloadFile(serverFile, @"d:\11.txt");
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

附：

测试程序代码： /Files/scottckt/WebClientStudy.rar

测试程序界面如下。