.net之访问Internet（下）

来源：互联网发布：淘宝怎么发布二手闲置编辑：程序博客网时间：2024/06/08 19:34

这里介绍一下TCPClient类和Socket类，主要以两个例子分析一下这两个类在接收发送数据上的不同

TCP示例：

TCP Sender，发送数据到server端

using System;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.IO;

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

        private void button1_Click(object sender, EventArgs e)
        {
            TcpClient client = new TcpClient(textBox1.Text, Int32.Parse(textBox2.Text));//textBox1用来输入地址，textBox2用来输入访问端口
            NetworkStream ns = client.GetStream();
            FileStream fs = File.Open("Form1.cs", FileMode.Open);

            int data = fs.ReadByte();
            while (data != -1)
            {
                ns.WriteByte((byte)data);
                data = fs.ReadByte();
            }

            fs.Close();
            ns.Close();
            client.Close();
        }
    }
}

TCP Receiver，监听并接收数据

using System;
using System.Windows.Forms;
using System.Threading;
using System.Net;
using System.Net.Sockets;
using System.IO;

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

            Thread thread = new Thread(new ThreadStart(Listen));
            thread.Start();
        }

        public void Listen()
        {
            IPAddress localAddr = IPAddress.Parse("127.0.0.1");
            Int32 port = 2112;
            TcpListener listener = new TcpListener(localAddr, port);
            listener.Start();

            TcpClient tcpClient = listener.AcceptTcpClient();
            NetworkStream ns = tcpClient.GetStream();
            StreamReader sr = new StreamReader(ns);
            string result = sr.ReadToEnd();
            Invoke(new UpdateDisplayDelegate(UpdateDisplay), new object[] { result });

            tcpClient.Close();
            listener.Stop();
        }

        public void UpdateDisplay(string text)
        {
            textBox1.Text = text;
        }

protected delegate void UpdateDisplayDelegate(string text);
}
}

最后执行结果如下：

Socket示例

Socket信息发送端：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.Net;

namespace SocketSenderConsole
{
class Program
{
static void Main(string[] args)
{
byte[] receivedBytes = new byte[1024];

//use the local host to create a IPEndPoint, which is connection end point
IPHostEntry ipHost = Dns.Resolve("127.0.0.1");
IPAddress ipAddress = ipHost.AddressList[0];
IPEndPoint ipEndPoint = new IPEndPoint(ipAddress, 2112);

Console.WriteLine("Starting: Creating Socket object.");

//to create a sender
Socket sender = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
sender.Connect(ipEndPoint);

string sendingMessage = "Hello World Socket Test";
Console.WriteLine("Creating message: Hello World Socket Test");

byte[] forwardMessage = Encoding.ASCII.GetBytes(sendingMessage + "[FINAL]");

//send messages
sender.Send(forwardMessage);

//receive the server response
int totalBytesReceived = sender.Receive(receivedBytes);

Console.WriteLine("Message provided from server: {0}", Encoding.ASCII.GetString(receivedBytes, 0, totalBytesReceived));

//shut down and dispose
sender.Shutdown(SocketShutdown.Both);
sender.Close();

Console.ReadLine();
}
}
}

socket信息监听端：

using System.Text;
using System.Net.Sockets;
using System.Net;

namespace SockedListener
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Starting: Creating Socket object.");

//The Socket class allows you to perform both synchronous and asynchronous data transfer using any of the communication protocols listed in the ProtocolType enumeration.
Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
listener.Bind(new IPEndPoint(IPAddress.Any, 2112));
listener.Listen(10);

while(true)
{
Console.WriteLine("Waiting for connection on port 2112");

//The Accept method processes any incoming connection requests and returns a Socket that you can use to communicate data with the remote host.
Socket socket = listener.Accept();
string receivedValue = string.Empty;

while(true)
{
byte[] receivedBytes = new byte[1024];
int numBytes = socket.Receive(receivedBytes);

Console.WriteLine("Receiving ...");

receivedValue += Encoding.ASCII.GetString(receivedBytes, 0, numBytes);

if (receivedValue.IndexOf("[FINAL]") > -1)
{
break;
}
}

Console.WriteLine("Received value: {0}", receivedValue);

string replyValue = "Message successfully received.";

byte[] replyMessage = Encoding.ASCII.GetBytes(replyValue);

socket.Send(replyMessage);
socket.Shutdown(SocketShutdown.Both);
socket.Close();
}

listener.Close();
}
}

执行结果：