当客户端下载文件的时候，需要先传给服务端一个数据，告诉服务端它将要下载文件，客户端要求的分包大小，原路径，目标路径，已经接受的分包个数，分包大小等等，服务端根据这个信息查找文件，发送一条数据给客户端告诉客户端文件大小，分包个数，分包大小，然后客户端发送一条数据到服务端，告诉服务端它协议解析正确开始接受数据，服务端发送确认消息，服务端开始发送文件数据，客户端开始接受文件数据并将其写入文件，发送完成之后，服务端发数据告诉客户端发送完成，客户端核对文件信息，发送确认信息给服务端，关闭socket链接。

 

由于篇幅，只贴几个方法的代码

private void sendMsg(string srcPath, string dirPath, bool isUpdate, string fName, long fLength, long dLength, long dNumber)
        {
            string msg = srcPath + "*" + dirPath + "*" + isUpdate + "*" + fName + "*" + fLength + "*" + dLength + "*" + dNumber;
            try
            {
                socket.Send(Encoding.UTF8.GetBytes(msg));
            }
            catch(Exception ex)
            {
                throw new Exception("Send message error:\n " + ex);
            }
        }

 

private void reciveFile(string srcPath, string dirPath,string fName,long dLength,long dReciveNumber,long dNumber)
        {       
            FileStream fs = null;
            try
            {
                try
                {
                    fs = new FileStream(dirPath, FileMode.OpenOrCreate);
                   
                    string dir = "sendRes:OK:OK";
                    sendDir(dir);
                }
                catch (Exception ex)
                {
                    string dire = "sendRes:error:" + ex.ToString();
                    sendDir(dire);
                    throw ex;
                }
                byte[] buffer = new byte[dLength];
                while (true)
                {
                    //Thread.Sleep(1);
                    int n = socket.Receive(buffer);
                    dReciveNumber++;
                    fs.Write(buffer, 0, n);
                    fs.Flush();
                    if (dReciveNumber==dNumber)
                    {
                        break;
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (fs != null)
                {
                    fs.Close();
                }
            }
               
        }

 

就到这儿吧