项目需求,实现cs 客户端自动更新,由于文件很大,只能通过socket 传输更新文件,这样服务器端需要把更新的文件发送到客户端。
基于此,做了一个Demo,案例简单,关键部分都有注释,文章最后附加源文件下载。希望对于正在学习socket 文件传输的同学有所帮助
服务端文件:

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.Sockets;
using System.Net;
using System.Threading;
using System.IO;
namespace FileServer
{
public partial class Form2 : Form
{
Socket Listensocket;
Thread listenThread;
public Form2()
{
InitializeComponent();
}
// 选择文件
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)
{
if (! string.IsNullOrEmpty(tbFileName.Text) && ! string.IsNullOrEmpty(tbFileSize.Text))
{
// 服务端节点
IPEndPoint ipep = new IPEndPoint(IPAddress.Parse( " 192.168.1.100 "), 8080);
// 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
listenThread = new Thread(listenClientConnnect);
listenThread.Start();
btnListen.Enabled = false;
}
else
{
MessageBox.Show( " 请浏览文件 ", " 提醒信息 ");
}
}
// 监听函数
private void listenClientConnnect()
{
stopListen(); // 停用
while ( true)
{
// 建立一个与客户端通信的套接字
Socket CommunicationSocket = Listensocket.Accept();
// 显示在listbox里面
IPEndPoint clientIP = (IPEndPoint)CommunicationSocket.RemoteEndPoint;
AddMsg( string.Format( " {0} 连接到本服务器 {1} ", clientIP.Address, DateTime.Now.ToString( " yyyy-MM-dd HH:mm:ss ")));
// 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();
AddMsg( string.Format( " 向{0} 发送 文件 已完成 {1} ", clientIP, DateTime.Now.ToString( " yyyy-MM-dd HH:mm:ss ")));
}
}
// 关闭
private void Form2_FormClosed( object sender, FormClosedEventArgs e)
{
if (Listensocket!= null)
{
Listensocket.Close();
}
}
// 停止监听
private void btnStop_Click( object sender, EventArgs e)
{
if (listenThread.IsAlive)
{
listenThread.Abort();
btnListen.Enabled = true;
btnStop.Enabled = false;
if (Listensocket!= null)
{
Listensocket.Close();
}
listBox1.Items.Add( " 服务器监听已经停止... ");
}
}
// 加载
private void Form2_Load( object sender, EventArgs e)
{
btnStop.Enabled = false;
btnListen.Enabled = true;
}
// 停止监听
private void stopListen()
{
if (btnStop.InvokeRequired)
{
Action stopAction = () => { stopListen(); };
btnStop.Invoke(stopAction);
}
else
{
btnStop.Enabled = true;
}
}
// 向listBox中增加信息
private void AddMsg( string msgStr)
{
if (listBox1.InvokeRequired)
{
Action< string> myAction = (p) => { AddMsg(p); };
this.listBox1.Invoke(myAction, msgStr);
}
else
{
this.listBox1.Items.Add(msgStr);
}
}
}
}
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.Sockets;
using System.Net;
using System.Threading;
using System.IO;
namespace FileServer
{
public partial class Form2 : Form
{
Socket Listensocket;
Thread listenThread;
public Form2()
{
InitializeComponent();
}
// 选择文件
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)
{
if (! string.IsNullOrEmpty(tbFileName.Text) && ! string.IsNullOrEmpty(tbFileSize.Text))
{
// 服务端节点
IPEndPoint ipep = new IPEndPoint(IPAddress.Parse( " 192.168.1.100 "), 8080);
// 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
listenThread = new Thread(listenClientConnnect);
listenThread.Start();
btnListen.Enabled = false;
}
else
{
MessageBox.Show( " 请浏览文件 ", " 提醒信息 ");
}
}
// 监听函数
private void listenClientConnnect()
{
stopListen(); // 停用
while ( true)
{
// 建立一个与客户端通信的套接字
Socket CommunicationSocket = Listensocket.Accept();
// 显示在listbox里面
IPEndPoint clientIP = (IPEndPoint)CommunicationSocket.RemoteEndPoint;
AddMsg( string.Format( " {0} 连接到本服务器 {1} ", clientIP.Address, DateTime.Now.ToString( " yyyy-MM-dd HH:mm:ss ")));
// 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();
AddMsg( string.Format( " 向{0} 发送 文件 已完成 {1} ", clientIP, DateTime.Now.ToString( " yyyy-MM-dd HH:mm:ss ")));
}
}
// 关闭
private void Form2_FormClosed( object sender, FormClosedEventArgs e)
{
if (Listensocket!= null)
{
Listensocket.Close();
}
}
// 停止监听
private void btnStop_Click( object sender, EventArgs e)
{
if (listenThread.IsAlive)
{
listenThread.Abort();
btnListen.Enabled = true;
btnStop.Enabled = false;
if (Listensocket!= null)
{
Listensocket.Close();
}
listBox1.Items.Add( " 服务器监听已经停止... ");
}
}
// 加载
private void Form2_Load( object sender, EventArgs e)
{
btnStop.Enabled = false;
btnListen.Enabled = true;
}
// 停止监听
private void stopListen()
{
if (btnStop.InvokeRequired)
{
Action stopAction = () => { stopListen(); };
btnStop.Invoke(stopAction);
}
else
{
btnStop.Enabled = true;
}
}
// 向listBox中增加信息
private void AddMsg( string msgStr)
{
if (listBox1.InvokeRequired)
{
Action< string> myAction = (p) => { AddMsg(p); };
this.listBox1.Invoke(myAction, msgStr);
}
else
{
this.listBox1.Items.Add(msgStr);
}
}
}
}
客户端文件:

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.Threading;
using System.Net.Sockets;
using System.Net;
namespace FileClient
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
// 连接
private void btnConnect_Click( object sender, EventArgs e)
{
Thread mythread = new Thread(GetData);
mythread.Start();
}
// 接受数据
private void GetData()
{
IPEndPoint ipep = new IPEndPoint(IPAddress.Parse( " 192.168.1.100 "), 8080);
Socket clientsocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
listBox1.Items.Add( " 连接远程服务器成功 ");
clientsocket.Connect(ipep);
}
catch (Exception)
{
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();
listBox1.Items.Add( string.Format( " {0}接收完毕 ", filename));
}
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;
}
}
}
}
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.Threading;
using System.Net.Sockets;
using System.Net;
namespace FileClient
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
// 连接
private void btnConnect_Click( object sender, EventArgs e)
{
Thread mythread = new Thread(GetData);
mythread.Start();
}
// 接受数据
private void GetData()
{
IPEndPoint ipep = new IPEndPoint(IPAddress.Parse( " 192.168.1.100 "), 8080);
Socket clientsocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
listBox1.Items.Add( " 连接远程服务器成功 ");
clientsocket.Connect(ipep);
}
catch (Exception)
{
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();
listBox1.Items.Add( string.Format( " {0}接收完毕 ", filename));
}
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;
}
}
}
}
程序源文件下载:源程序下载