网络文件操作-优快云博客

本文介绍了一种通过C#实现的网络文件处理方法，包括获取网络IP和端口、获取文件大小、多线程下载文件以及合并文件的具体步骤和技术细节。

0、获取网络IP、端口：

            NameValueCollection nameValueTable = new NameValueCollection();

            if (ApplicationDeployment.IsNetworkDeployed)
            {
                string queryString = ApplicationDeployment.CurrentDeployment.ActivationUri.Query;
                nameValueTable = HttpUtility.ParseQueryString(queryString);
            }

nameValueTable["IP"];

1、获取网络文件大小：

                HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);
                httpWebRequest.Method = "GET";
                httpWebRequest.KeepAlive = false;
                httpWebRequest.AllowAutoRedirect = true;
                httpWebRequest.Referer = url.Substring(0, url.LastIndexOf("/") + 1);
                httpWebRequest.UserAgent = "Mozilla/5.0 (compatible; MSIE 6.0; Windows NT 5.2;)";
                WebResponse webResponse = httpWebRequest.GetResponse();
                Int64 fileSize = webResponse.ContentLength;
                webResponse.Close();
                httpWebRequest.Abort();
                httpWebRequest = null;

2、下载文件

　　　　　　　　　Byte[] bytes = new Byte[this.bufferSize];
            　　Int32 readBytes = 0;
            　　FileStream fs = new FileStream(threadFileName[currentThreadIndex], FileMode.Create, FileAccess.Write);
          
                HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);
                httpWebRequest.Method = "GET";
                httpWebRequest.KeepAlive = false;
                httpWebRequest.AllowAutoRedirect = true;
                httpWebRequest.Referer = url.Substring(0, url.LastIndexOf("/") + 1);
                httpWebRequest.UserAgent = "Mozilla/5.0 (compatible; MSIE 6.0; Windows NT 5.2;)";
                //接收的起始位置及接收的长度
                httpWebRequest.AddRange(Convert.ToInt32(threadFileStart[currentThreadIndex]), Convert.ToInt32(threadFileStart[currentThreadIndex] + threadFileSize[currentThreadIndex] - 1));
                WebResponse webResponse = httpWebRequest.GetResponse();
                Stream stream = webResponse.GetResponseStream();//获得接收流
                readBytes = stream.Read(bytes, 0, this.bufferSize);
                while (readBytes > 0)
                {
                    fs.Write(bytes, 0, readBytes);
                    readBytes = stream.Read(bytes, 0, this.bufferSize);
                }

                fs.Flush();
                fs.Close();
                fs.Dispose();
                stream.Close();
                stream.Dispose();
                webResponse.Close();
                httpWebRequest.Abort();
                httpWebRequest = null;

3、合并文件（一般要加锁（Lock））

 　　　　　　　　　　　 FileStream fs = new FileStream(destinationFileFullName, FileMode.Append, FileAccess.Write);
                    FileStream fsTemp = null;
                    Int32 readBytes;
                    Byte[] bytes = new Byte[this.bufferSize];
                    for (Int32 idx = 1; idx < threadCount; idx++) //从第二个线程接收的临时文件开始合并
                    {
                        fsTemp = new FileStream(threadFileName[idx], FileMode.Open, FileAccess.Read);
                        readBytes = fsTemp.Read(bytes, 0, this.bufferSize);

                        while (readBytes > 0)
                        {
                            fs.Write(bytes, 0, readBytes);
                            readBytes = fsTemp.Read(bytes, 0, this.bufferSize);
                        }

                        fsTemp.Close();
                        File.Delete(threadFileName[idx]);
                    }

                    fs.Close();
                    fs.Dispose();