【发布时间】：2014-03-13 12:36:26
【问题描述】：
我正在开发一个客户端-服务器程序。客户端向服务器发送一个 .txt 文件，服务器接收到这个 .txt 文件并保存。
我的问题： 如果我发送一个包含以下内容的 .txt 文件：“Hello world”（没有“”） 然后服务器接收/保存一个 .txt 文件，其中包含以下内容“ÿÿÿÿÿÿÿÿÿÿÿ”（不带“”）。
两个文件的文件大小完全相同。
这是我的代码：
客户： 程序.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace FTP_3___Client {
public class Program {
static void Main(string[] args) {
new Client();
}
}
}
客户： Client.cs：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
using FTP_3___Client;
namespace FTP_3___Client {
public class Client {
public string name { get; set; }
public TcpClient clientConnection { get; set; }
public NetworkStream nws { get; set; }
public StreamReader sr { get; set; }
public StreamWriter sw { get; set; }
public int sizeOfConnectedClients { get; set; }
public string clientnamelistString { get; set; }
public Client() {
connectToServer();
sendFile("zzz.txt");
}
public void connectToServer() {
Console.WriteLine("connect to server...");
clientConnection = new TcpClient();
IPAddress ipadress = IPAddress.Parse("127.0.0.1");
clientConnection.Connect(ipadress, 5555);
Console.WriteLine("connected to server!");
nws = clientConnection.GetStream();
sr = new StreamReader(nws);
sw = new StreamWriter(nws);
}
private void sendFile(string filename) {
FileStream fs = File.OpenRead(filename);
FileInfo fo = new FileInfo(filename);
long filesize = fo.Length;
Console.WriteLine("Filesize: " + filesize);
sw.WriteLine("/sendFile");
sw.Flush();
// Send filename to server
sw.WriteLine("Filename: " + filename);
sw.Flush();
// Send filesize to server
sw.WriteLine("Filesize: " + filesize);
sw.Flush();
byte[] fileBytes = File.ReadAllBytes(filename);
sw.WriteLine(fileBytes.Length);
sw.Flush();
for (int i = 0; i < fileBytes.Length; i++) {
nws.WriteByte(fileBytes[i]);
}
sr.Close();
sw.Close();
nws.Close();
Console.WriteLine("File sends!");
Console.ReadLine();
}
}
}
服务器：Program.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace FTP_3___Server {
class Program {
static void Main(string[] args) {
new Server();
}
}
}
服务器：Server.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.Net;
using System.Net.Sockets;
using System.IO;
namespace FTP_3___Server {
public class Server {
private IPAddress ipadress;
private TcpListener serverconnection;
private TcpClient clientconnection;
public NetworkStream nws { get; set; }
public StreamReader sr { get; set; }
public StreamWriter sw { get; set; }
public Server() {
startServer();
waitForClient();
}
public void startServer() {
ipadress = IPAddress.Parse("127.0.0.1");
serverconnection = new TcpListener(ipadress, 5555);
serverconnection.Start();
}
public void waitForClient() {
Console.WriteLine("Server startet. Waiting for incoming client connections...");
clientconnection = serverconnection.AcceptTcpClient();
nws = clientconnection.GetStream();
sr = new StreamReader(nws);
sw = new StreamWriter(nws);
Console.WriteLine("Client connected with Server!");
receiveMessage();
}
public void receiveMessage() {
string receivedMessage = sr.ReadLine();
switch (receivedMessage) {
case "/sendFile": {
receiveFile();
break;
}
default: {
Console.WriteLine("Received undefined message: " + receivedMessage);
break;
}
}
}
public void receiveFile() {
// Recieve filename
string filename = sr.ReadLine().Remove(0, 10);
// Recieve filesize
long filesize = Convert.ToInt64(sr.ReadLine().Remove(0, 10));
Console.WriteLine("Filename: " + filename);
Console.WriteLine("Filesize: " + filesize);
long count = filesize;
int arrayLength = Convert.ToInt32(sr.ReadLine());
byte[] filebytes = new byte[arrayLength];
for (int i = 0; i < filebytes.Length; i++) {
filebytes[i] = (byte)nws.ReadByte();
}
try {
File.WriteAllBytes(filename, filebytes);
} catch (IOException e) {
Console.WriteLine(e.StackTrace);
}
sr.Close();
sw.Close();
nws.Close();
Console.WriteLine("File was written on HDD. Finish!");
Console.ReadLine();
}
}
}
【问题讨论】：
-
不要盲目地将
nws.ReadByte()的返回值强制转换为byte，检查是否返回-1，表示流结束。 -
我改了，现在服务器收到的.txt文件只包含11个空格......
-
这意味着服务器端从未收到文件内容或您已经阅读过它。也许
StreamReader已经读取了这些字节并缓冲了它们？我认为您不应该直接从底层流中读取StreamReader和。 -
非常感谢，这是我的问题！我现在不是用 Networkstream 而是用 Streamreader/Streamwriter 读/写文件字节。
标签： c# client-server file-transfer