How to read and write data from and to network connections in Go?

To read and write data from and to network connections in Go, you can use the net package which provides a set of functions and types for network operations.

To read data from a network connection, you can use the Read() method on the net.Conn type. Here's an example:

package main

import (
    "fmt"
    "net"
)

func main() {
    // Connect to a network address
    conn, err := net.Dial("tcp", "example.com:80")
    if err != nil {
        fmt.Println("Error connecting:", err)
        return
    }
    defer conn.Close()

    // Read data from the network connection
    buffer := make([]byte, 1024)
    bytesRead, err := conn.Read(buffer)
    if err != nil {
        fmt.Println("Error reading:", err)
        return
    }

    // Process the read data
    fmt.Println("Read", bytesRead, "bytes:", string(buffer[:bytesRead]))
}

In this example, we connect to a TCP network address using net.Dial() and then read data from the connection using conn.Read(). The read data is stored in a buffer and then processed as needed.

To write data to a network connection, you can use the Write() method on the net.Conn type. Here's an example:

package main

import (
    "fmt"
    "net"
)

func main() {
    // Connect to a network address
    conn, err := net.Dial("tcp", "example.com:80")
    if err != nil {
        fmt.Println("Error connecting:", err)
        return
    }
    defer conn.Close()

    // Write data to the network connection
    message := []byte("Hello, server!")
    bytesWritten, err := conn.Write(message)
    if err != nil {
        fmt.Println("Error writing:", err)
        return
    }

    fmt.Println("Written", bytesWritten, "bytes")
}

In this example, we connect to a TCP network address and then write a message to the connection using conn.Write(). The number of bytes written is stored in bytesWritten.