Socket简单学习之UDP通信

UDP不可靠通信，不建立连接，只发送一次数据，不管对方是否接收

服务器端

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Sockets;
using System.Net;
using System.Text;
using System.Threading.Tasks;namespace UDPsocket
{class Program{static void Main(string[] args){Socket UDPSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);//设置udp网络传输UDPSocket.Bind(new IPEndPoint(IPAddress.Parse("192.168.43.92"), 5566));//设置服务器的ip的端口号，用这个ip和端口号进行接收和发送数据EndPoint point = new IPEndPoint(IPAddress.Any, 0);//定义一个Endpoint对象，用来存储传数据过来的客户端的ip 和端口号byte[] date = new byte[1024];//定义字节数组用来存储传来的数据int length = UDPSocket.ReceiveFrom(date, ref point);//接收客户端的数据string str = Encoding.UTF8.GetString(date, 0, length);Console.WriteLine(str);string str1 = "已连接服务器";byte[] date1 = Encoding.UTF8.GetBytes(str1);UDPSocket.SendTo(date1, point);//向客户端发送数据Console.ReadKey(); }}
}

1：创建socket,将通信设置为内网，udp通信

Socket UDPSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);//设置udp网络传输

2：绑定服务器的端口和ip

UDPSocket.Bind(new IPEndPoint(IPAddress.Parse("192.168.43.92"), 5566));//设置服务器的ip的端口号，用这个ip和端口号进行接收和发送数据

3：ReceriverForm(date ref point)接收二进制数据，用point 记录发送数据过来的端口和ip

EndPoint point = new IPEndPoint(IPAddress.Any, 0);//定义一个Endpoint对象，用来存储传数据过来的客户端的ip 和端口号byte[] date = newbyte[1024];//定义字节数组用来存储传来的数据int length = UDPSocket.ReceiveFrom(date, ref point);//接收客户端的数据

4：SentTo(date ,point) 向point地址的客户端发送数据

byte[] date1 = Encoding.UTF8.GetBytes(str1);

UDPSocket.SendTo(date1, point);//向客户端发送数据

客户端

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;namespace UDPSocketClient
{class Program{static void Main(string[] args){Socket udpSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);//声明socket对象，来进行UDP不可靠传输//发送数据string str = "请求进行UDP传输";byte[] date = Encoding.UTF8.GetBytes(str);EndPoint point = new IPEndPoint(IPAddress.Parse("192.168.43.92"),5566);//客户端的数据要发送到这个地址的服务器上udpSocket.SendTo(date,point);//将数据发送到指定地址上//接收数据byte[] date1 = new byte[1024];EndPoint point1 = new IPEndPoint(IPAddress.Any, 0);//用来存储是哪个对象发送的数据，记录他的ip和端口号int length = udpSocket.ReceiveFrom(date1,ref point1);//接收服务器端发送的内容string str1 = Encoding.UTF8.GetString(date1, 0, length);//输出服务器用来接收数据的IP和端口号和内容Console.WriteLine("服务器的ip是{0}，端口号是{1}",(point1 as IPEndPoint).Address,(point1 as IPEndPoint).Port);Console.WriteLine(str1);Console.ReadKey();}}
}

因为UDP是不可靠传输，不需要建立连接，只需在每次发送数据时指定数据的接收方即可

1：创建socket,将通信设置为内网，udp通信

Socket udpSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);//声明socket对象，来进行UDP不可靠传输

2：ReceriverForm(date ref point)接收二进制数据，用point 记录发送数据过来的端口和ip

//接收数据byte[] date1 = newbyte[1024];

EndPoint point1 = new IPEndPoint(IPAddress.Any, 0);//用来存储是哪个对象发送的数据，记录他的ip和端口号int length = udpSocket.ReceiveFrom(date1,ref point1);//接收服务器端发送的内容

3：SentTo(date ,point) 向point地址的客户端发送数据

string str = "请求进行UDP传输";

byte[] date = Encoding.UTF8.GetBytes(str);

EndPoint point = new IPEndPoint(IPAddress.Parse("192.168.43.92"),5566);//客户端的数据要发送到这个地址的服务器上

udpSocket.SendTo(date,point);//将数据发送到指定地址上

利用UDPClient代替socket，UDPClient对象是一个已近封装好的socket，不需要我们自己设置socket

服务器端

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Sockets;
using System.Net;
using System.Text;
using System.Threading.Tasks;namespace UDPClient1{//服务器端class Program{static void Main(string[] args){UdpClient client = new UdpClient(new IPEndPoint(IPAddress.Parse("192.168.43.92"), 5566));//定义好服务器的ip和端口号//接收数据IPEndPoint point = new IPEndPoint(IPAddress.Any,0);//定义一个对象来存储客户端的ip和端口号byte[] date = client.Receive(ref point);//接收客户端的数据，并将数据来源存储在point中string str = Encoding.UTF8.GetString(date);Console.WriteLine(str);//发送数据string str1 = "已近连接服务器";byte[] date1 = Encoding.UTF8.GetBytes(str1);client.Send(date1, date1.Length, point);//将date1数据发送到point地址上client.Close();//关闭Console.ReadKey();}}
}

1：绑定服务器端的ip和端口号

UdpClient client = new UdpClient(new IPEndPoint(IPAddress.Parse("192.168.43.92"), 5566));//定义好服务器的ip和端口号

//接收数据

2：利用sent(date,int ,point)向point地址发送数据

string str1 = "已近连接服务器";

byte[] date1 = Encoding.UTF8.GetBytes(str1);

client.Send(date1, date1.Length, point);//将date1数据发送到point地址上

3：利用Receive(ref point)接收数据，利用point记录发送数据的来源

//接收数据

IPEndPoint point = new IPEndPoint(IPAddress.Any,0);//定义一个对象来存储客户端的ip和端口号byte[] date = client.Receive(ref point);//接收客户端的数据，并将数据来源存储在point中string str = Encoding.UTF8.GetString(date);

4：关闭UDPClient对象

client.Close();//关闭

客户端

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Sockets;
using System.Net;
using System.Text;
using System.Threading.Tasks;namespace UDPSock
{class Program{static void Main(string[] args){UdpClient UDPclient = new UdpClient();//创建UDPClient对象,这里不需要指定地址，每次发送时指定发送地址IPEndPoint point = new IPEndPoint(IPAddress.Parse("192.168.43.92"), 5566);//将数据发送到这个地址上去//发送数据string str = "请求建立UDP连接";byte[] date = Encoding.UTF8.GetBytes(str);UDPclient.Send(date,date.Length,point);//接收数据byte[] date1 = UDPclient.Receive(ref point);//将数据的来源存储在point里string str1 = Encoding.UTF8.GetString(date1);Console.WriteLine(str1);UDPclient.Close();//关闭Console.ReadKey();}}
}

1：udp不需要建立连接，在要发送数据时指定发送数据的地址即可

UdpClient UDPclient = new UdpClient();//创建UDPClient对象,这里不需要指定地址，每次发送时指定发送地址

2：sent(date,int,point)发送数据

IPEndPoint point = new IPEndPoint(IPAddress.Parse("192.168.43.92"), 5566);//将数据发送到这个地址上去

string str = "请求建立UDP连接";

byte[] date = Encoding.UTF8.GetBytes(str);

UDPclient.Send(date,date.Length,point);

3：receive(ref point)接收数据，将数据的来源记录到point上

//接收数据byte[] date1 = UDPclient.Receive(ref point);//将数据的来源存储在point里string str1 = Encoding.UTF8.GetString(date1);

4：关闭UDPClient

UDPclient.Close();

https://www.cnblogs.com/zhangyang4674/p/11408467.html