socket+TCP文件传输

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace SocketFileSend
{
    public partial class Form1 : Form
    {
        Socket Listensocket;
        public Form1()
        {
            InitializeComponent();
        }

        //选取要发送的文件
        private void BtnSelectFile_Click(object sender, EventArgs e)
        {
            if (this.openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                FileInfo fileinfo = new FileInfo(this.openFileDialog1.FileName);
                TBFileName.Text = fileinfo.FullName;
                TBFileSize.Text = fileinfo.Length.ToString();
            }
        }
        //开始监听
        private void btnListen_Click(object sender, EventArgs e)
        {
            //服务端节点
            IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("192.168.1.102"), 8000);
            //创建套接字
            Listensocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
          //绑定IP地址和端口到套接字
            Listensocket.Bind(ipep);
            //启动监听
            Listensocket.Listen(10);
            listBox1.Items.Add("开始监听客户端的连接请求");
            //在一个单独的线程中监听客户连接
            Thread listenThread = new Thread(listenClientConnnect);
            listenThread.Start();
        }

        private void listenClientConnnect() 
        {
            while (true)
            { 
                //建立一个与客户端通信的套接字
                Socket CommunicationSocket = Listensocket.Accept();
                //创建一个文件对象
                FileInfo fileinfo = new FileInfo(TBFileName.Text);
                //打开文件流
                FileStream filestream = fileinfo.OpenRead();
                //文件分块传输，分块的大小,单位为字节
                int PacketSize = 5000;
                //分块的数量
                int PacketCount = (int)(fileinfo.Length / ((long)PacketSize));
                //最后一个分块的大小
                int LastPacketSize = (int)(fileinfo.Length - ((long)(PacketSize * PacketCount)));
               //发送文件名到接收端,文件名长度最多只允许100个字节
                byte[] Fullfilename = new byte[100];
                if (System.Text.Encoding.UTF8.GetBytes(fileinfo.Name).Length > 100)
                {
                    MessageBox.Show("文件名太长");
                    break;
                }
                else
                {
                    byte[] filename=System.Text.Encoding.UTF8.GetBytes(fileinfo.Name);
                    for (int i = 0; i < filename.Length; i++)
                        Fullfilename[i] = filename[i];
                    CommunicationSocket.Send(Fullfilename);
                }

               //文件按数据包的形式发送，定义数据包的大小   
               byte[] data=new byte[PacketSize];   
               //开始循环发送数据包   
               for(int i=0;i<PacketCount;i++)   
                {   
                  //从文件流读取数据并填充数据包   
                    filestream.Read(data, 0, data.Length);   
                  //发送数据包  
                    CommunicationSocket.Send(data, 0, data.Length, SocketFlags.None);                                   
                } 
 
                //发送最后一个数据包   
               if (LastPacketSize != 0)   
               {
                   data = new byte[LastPacketSize];
                   filestream.Read(data, 0, data.Length);
                   //发送数据包
                   CommunicationSocket.Send(data, 0, data.Length, SocketFlags.None);   
               }
               filestream.Close();
               CommunicationSocket.Close();
               MessageBox.Show("发送完毕");
             }
        }

     
        //关闭窗体时发生
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            Listensocket.Close();
        }

      
    }
}

以上是发送端代码。下面是接收端代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Threading;

namespace SocketFileReceive
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnConnect_Click(object sender, EventArgs e)
        {
            Thread mythread = new Thread(GetData);
            mythread.Start();
        }

        private void GetData() 
        {
            //创建网络端点           
            IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("192.168.1.102"), 8000);
            //创建套接字
            Socket clientsocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            //连接远程服务器
            try
            {
                clientsocket.Connect(ipep);
                listBox1.Items.Add("连接远程服务器成功");
            }
            catch
            {
                listBox1.Items.Add("连接远程服务器失败");
            }
            //接收文件的名称
            string filename = System.Text.Encoding.UTF8.GetString(ReceiveStrToByte(clientsocket)).Split('\0')[0];
            //创建一个新文件

            FileStream MyFileStream = new FileStream(filename, FileMode.Create, FileAccess.Write);


            int PacketSize = 5000;
            //定义一个完整数据包缓存   
            byte[] data = new byte[PacketSize];
            while (true)
            {
                int revcount = clientsocket.Receive(data, 0, PacketSize, SocketFlags.None);
                if (revcount == 0)
                {
                    data = null;
                    break;
                }
                //处理最后一个数据包
                if (revcount != PacketSize)
                {
                    byte[] lastdata = new byte[revcount];
                    for (int i = 0; i < revcount; i++)
                        lastdata[i] = data[i];
                    //将接收到的最后一个数据包写入到文件流对象   
                    MyFileStream.Write(lastdata, 0, lastdata.Length);
                    lastdata = null;
                }
                else
                {
                    //将接收到的数据包写入到文件流对象   
                    MyFileStream.Write(data, 0, data.Length);
                }
            }
            //关闭文件流
            MyFileStream.Close();
            //关闭套接字
            clientsocket.Close();
            MessageBox.Show("接收完毕");
        }

        //关闭窗体时发生
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {

        }

        //接收函数，（文件名最多100个字节）
        private byte[] ReceiveStrToByte(Socket s) 
        {
            try
            {
                byte[] dataninfo = new byte[100];
                int revByteNum = s.Receive(dataninfo, 0, dataninfo.Length, SocketFlags.None);
                byte[] retByte = new byte[revByteNum];
                for (int i = 0; i < revByteNum; i++)
                    retByte[i] = dataninfo[i];
                return retByte;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                return null;
            }
        }
    }
}