C# TcpClient网络编程传输文件（带文件名）(必须看)

转载自：https://www.cnblogs.com/kongbailingluangan/p/6476855.html

一、简述

　　利用C# TcpClient在局域网内传输文件，可是文件发送到对面的时候却要重新命名文件的。那可不可以连着文件名与文件一起发过去呢？

二、内容



　　如上图，把文件名字符流的长度的值的字符流（这个文件名字符流长度的值固定是11位的字符串，不足11位前面补0）与文件名的字符流合为一个byte数组然后与文件发送到对面。对面接收后解析出文件名字符流长度的值后，再根据长度解析出文件名，接下来再获取文件流。

　　服务端

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

namespace TCPSendFile
{
public partial class Form1 : Form
{
public delegate void TxtReceiveAddContentEventHandler(string txtValue);

public Form1()
{
InitializeComponent();
}

public void TxtAddContent(string txtValue)
{
if (textBox1.InvokeRequired)
{
TxtReceiveAddContentEventHandler addContent = TxtAddContent;
textBox1.Invoke(addContent, new object[] { txtValue });
}
else
{
textBox1.Text = txtValue + "\r\n" + textBox1.Text;
}
}

private void button1_Click(object sender, EventArgs e)
{

TcpListener tcpListener = new TcpListener(IPAddress.Any, 18001);
tcpListener.Start();
textBox1.Text = "开始侦听...";
Thread thread = new Thread(SendFileFunc);
thread.Start(tcpListener);
thread.IsBackground = true;
}

public void SendFileFunc(object obj)
{
TcpListener tcpListener = obj as TcpListener;
while (true)
{
try
{
TcpClient tcpClient = tcpListener.AcceptTcpClient();
if (tcpClient.Connected)
{
NetworkStream stream = tcpClient.GetStream();
string fileName = "testfile.rar";

byte[] fileNameByte = Encoding.Unicode.GetBytes(fileName);

byte[] fileNameLengthForValueByte = Encoding.Unicode.GetBytes(fileNameByte.Length.ToString("D11"));
byte[] fileAttributeByte = new byte[fileNameByte.Length + fileNameLengthForValueByte.Length];

fileNameLengthForValueByte.CopyTo(fileAttributeByte, 0);  //文件名字符流的长度的字符流排在前面。

fileNameByte.CopyTo(fileAttributeByte, fileNameLengthForValueByte.Length);  //紧接着文件名的字符流

stream.Write(fileAttributeByte, 0, fileAttributeByte.Length);
FileStream fileStrem = new FileStream(Application.StartupPath + "\\WebFile\\" + fileName, FileMode.Open);

int fileReadSize = 0;
long fileLength = 0;
while (fileLength < fileStrem.Length)
{
byte[] buffer = new byte[2048];
fileReadSize = fileStrem.Read(buffer, 0, buffer.Length);
stream.Write(buffer, 0, fileReadSize);
fileLength += fileReadSize;

}
fileStrem.Flush();
stream.Flush();
fileStrem.Close();
stream.Close();

TxtAddContent(string.Format("{0}文件发送成功", fileName));
}

}
catch (Exception ex)
{

}
}
}
}
}

　　客户端

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

namespace TCPReceiveFile
{
public partial class Form1 : Form
{
public delegate void TxtReceiveAddContentEventHandler(string txtValue);
public Form1()
{
InitializeComponent();
}
public void TxtReceiveAddContent(string txtValue)
{
if (txtReceive.InvokeRequired)
{
TxtReceiveAddContentEventHandler addContent = TxtReceiveAddContent;
txtReceive.Invoke(addContent, new object[] { txtValue });
}
else
{
txtReceive.Text = txtValue + "\r\n" + txtReceive.Text;
}
}

private void button1_Click(object sender, EventArgs e)
{
IPEndPoint ipEndPoint = new IPEndPoint(IPAddress.Parse("192.168.1.101"), 18001);
TxtReceiveAddContent("连接中。。。。。");
Thread th = new Thread(ReceiveFileFunc);
th.Start(ipEndPoint);
th.IsBackground = true;
}

private void ReceiveFileFunc(object obj)
{
IPEndPoint ipEndPoint = obj as IPEndPoint;
TcpClient tcpClient = new TcpClient();
try
{
tcpClient.Connect(ipEndPoint);
}
catch
{
TxtReceiveAddContent("连接失败，找不到服务器！");
}

if (tcpClient.Connected)
{

NetworkStream stream = tcpClient.GetStream();
if (stream != null)
{

byte[] fileNameLengthForValueByte = Encoding.Unicode.GetBytes((256).ToString("D11"));
byte[] fileNameLengByte = new byte[1024];
int fileNameLengthSize = stream.Read(fileNameLengByte, 0, fileNameLengthForValueByte.Length);
string fileNameLength = Encoding.Unicode.GetString(fileNameLengByte, 0, fileNameLengthSize);
TxtReceiveAddContent("文件名字符流的长度为：" + fileNameLength);

int fileNameLengthNum = Convert.ToInt32(fileNameLength);
byte[] fileNameByte = new byte[fileNameLengthNum];

int fileNameSize = stream.Read(fileNameByte, 0, fileNameLengthNum);
string fileName = Encoding.Unicode.GetString(fileNameByte, 0, fileNameSize);
TxtReceiveAddContent("文件名为：" + fileName);

string dirPath = Application.StartupPath + "\\WebFile";
if(!Directory.Exists(dirPath))
{
Directory.CreateDirectory(dirPath);
}
FileStream fileStream = new FileStream(dirPath + "\\" + fileName, FileMode.Create, FileAccess.Write);
int fileReadSize = 0;
byte[] buffer = new byte[2048];
while ((fileReadSize = stream.Read(buffer, 0, buffer.Length)) > 0)
{
fileStream.Write(buffer, 0, fileReadSize);

}
fileStream.Flush();
fileStream.Close();
stream.Flush();
stream.Close();
tcpClient.Close();
TxtReceiveAddContent("接收成功");
}
}
}

}
}

　　实例图