Detailed introduction to the relevant knowledge of Golang connection process

Golang is a programming language with a very efficient and fast connection process, making Golang popular in network programming. This article will introduce relevant knowledge about the Golang connection process.

1. TCP connection

Golang achieves high-speed connection function by using TCP protocol to connect to the network. The main steps of connection are as follows:

1. Set the server IP address and port number;
2. Create a socket to connect to the server;
3. Connect to the server and establish TCP connection;
4. Send and receive data;
5. Close the connection.

For specific implementation, please refer to the following sample code:

package main

import (
    "fmt"
    "net"
    "os"
)

func main() {
    service := "127.0.0.1:3333"
    tcpAddr, err := net.ResolveTCPAddr("tcp", service)
    checkError(err)

    conn, err := net.DialTCP("tcp", nil, tcpAddr)
    checkError(err)

    _, err = conn.Write([]byte("Hello, Golang!"))
    checkError(err)

    result := make([]byte, 256)
    n, err := conn.Read(result)
    checkError(err)

    fmt.Println(string(result[0:n]))
    os.Exit(0)
}

func checkError(err error) {
    if err != nil {
        fmt.Fprintf(os.Stderr, "Fatal error: %s", err.Error())
        os.Exit(1)
    }
}

The above is a simple Golang TCP connection sample code. Through this code, we can send "Hello, Golang!" to the server and receive the server's response. This is a very typical Golang connection process.

2. UDP connection

Different from TCP connection, Golang can also connect to the network through UDP protocol. The main steps of the UDP connection process are as follows:

1. Set the server IP address and port number;
2. Create a socket to connect to the server;
3. Send data ;
4. Receive data;
5. Close the connection.

For specific implementation, please refer to the following sample code:

package main

import (
    "fmt"
    "net"
    "os"
)

func main() {
    service := "127.0.0.1:3333"
    udpAddr, err := net.ResolveUDPAddr("udp", service)
    checkError(err)

    conn, err := net.DialUDP("udp", nil, udpAddr)
    checkError(err)

    _, err = conn.Write([]byte("Hello, Golang!"))
    checkError(err)

    result := make([]byte, 256)
    n, err := conn.Read(result)
    checkError(err)

    fmt.Println(string(result[0:n]))
    os.Exit(0)
}

func checkError(err error) {
    if err != nil {
        fmt.Fprintf(os.Stderr, "Fatal error: %s", err.Error())
        os.Exit(1)
    }
}

The above is a simple Golang UDP connection sample code. Through this code, we can send "Hello, Golang!" to the server and receive the server's response. This is also a very typical Golang connection process.

3. Summary

Through the above introduction, we can see that the Golang connection process is very simple and efficient. Golang can connect to the network through TCP protocol and UDP protocol to achieve high-speed transmission function, making network programming simpler and more efficient.

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