Go 언어의 네트워크 프로그래밍 기능에 대한 심층적인 이해

// TCP服务器
package main

import (
    "fmt"
    "net"
)

func handleConnection(conn net.Conn) {
    defer conn.Close()
    fmt.Println("Accepted connection from", conn.RemoteAddr().String())

    // 读取客户端发来的数据
    data := make([]byte, 1024)
    _, err := conn.Read(data)
    if err != nil {
        fmt.Println("Error reading:", err)
        return
    }
    fmt.Println("Received data:", string(data))
}

func main() {
    ln, err := net.Listen("tcp", ":8080")
    if err != nil {
        fmt.Println("Error listening:", err)
        return
    }
    defer ln.Close()
    fmt.Println("Server listening on :8080")

    for {
        conn, err := ln.Accept()
        if err != nil {
            fmt.Println("Error accepting connection:", err)
            continue
        }
        go handleConnection(conn)
    }
}

// TCP客户端
package main

import (
    "fmt"
    "net"
)

func main() {
    conn, err := net.Dial("tcp", "127.0.0.1:8080")
    if err != nil {
        fmt.Println("Error connecting:", err)
        return
    }
    defer conn.Close()

    // 向服务器发送数据
    data := []byte("Hello, TCP server!")
    _, err = conn.Write(data)
    if err != nil {
        fmt.Println("Error sending data:", err)
        return
    }
    fmt.Println("Data sent to server:", string(data))
}

// HTTP服务器
package main

import (
    "fmt"
    "net/http"
)

func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Hello, HTTP client!")
}

func main() {
    http.HandleFunc("/", handler)
    fmt.Println("Server listening on :8080")
    http.ListenAndServe(":8080", nil)
}