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
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