作者:吴素婷76625 | 来源:互联网 | 2023-09-11 17:10
面试的时候偶尔会问到UDP和TCP的一个区别。
TCP是一种面向连接的、可靠的、基于字节流的传输层通信协议。举例:打电话,需要双方都接通,才能进行对话。特点:效率低,数据传输比较安全。
UDP是一种面向无连接的传输层通信协议。举例:发短信,不需要双方建立连接,但是,数据报的大小应限制在64k以内。特点:效率高,数据传输不安全,容易丢包
然后发现在网上查找关于C#运行UDP的实例,确实不好找,杂乱无章。痛定思痛!
进行一个简单的发送和接收测试。
目前,UDP本人亲自用过的场景,客户端和服务端需要进行数据传输,但是服务端,在开始时是连接的别的网络,切换过来之后,并不能知道当前的一个具体的IP地址。但是客户端的IP地址是固定的,此种场景下,服务端网络切换过来之后,建立UDP服务端,像指定的客户端(IP地址和端口号)发送数据,即可知道当前服务端的ip地址。
服务端界面
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace MyTest.UDP
{
public partial class UDP_Sever : Form
{
IPEndPoint remotePoint;
UdpClient sever = null;
public UDP_Sever()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
IPAddress remoteIP = IPAddress.Parse(textBox1.Text.Trim());
int remotePort =int.Parse(textBox2.Text.Trim());
remotePoint = new IPEndPoint(remoteIP, remotePort);
sever = new UdpClient();
}
private void button2_Click(object sender, EventArgs e)
{
if (!string.IsNullOrWhiteSpace(textBox3.Text.Trim()))
{
string sendString = textBox3.Text.Trim();
byte[] sendData = Encoding.Default.GetBytes(sendString);
sever.Send(sendData, sendData.Length, remotePoint);
textBox3.Text = "";
}
}
private void UDP_Sever_FormClosing(object sender, FormClosingEventArgs e)
{
sever.Close();
}
}
}
客户端界面
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace MyTest.UDP
{
public partial class UDP_Client : Form
{
UdpClient client = null;
IPEndPoint remotePoint;
string receiveString = null;
byte[] receiveData = null;
public UDP_Client()
{
InitializeComponent();
CheckForIllegalCrossThreadCalls = false;
}
private void button1_Click(object sender, EventArgs e)
{
remotePoint = new IPEndPoint(IPAddress.Any, 0);
client = new UdpClient(int.Parse(textBox2.Text.Trim()));
Thread thread = new Thread(Revice);
thread.IsBackground = true;
thread.Start();
}
private void Revice()
{
while (true)
{
receiveData = client.Receive(ref remotePoint);
receiveString = Encoding.Default.GetString(receiveData);
listBox1.Items.Add(remotePoint.Address.ToString()+":"+ receiveString);
}
}
}
}
亲测有效!
参考链接:https://www.cnblogs.com/longzhankunlun/p/6251436.html?utm_source=itdadao&utm_medium=referral