golang学习笔记之tcp简单实现:server端与client端

server端

main.go

package main

import (
	"fmt"
	"net"
)

func main() {
	//   simple tcp server
	//1.listen ip+port
	listener, err := net.Listen("tcp", "0.0.0.0:9090")
	if err != nil {
		fmt.Printf("listen fail, err: %v\n", err)
		return
	}

	//2.accept client request
	//3.create goroutine for each request
	for {
		conn, err := listener.Accept()
		if err != nil {
			fmt.Printf("accept fail, err: %v\n", err)
			continue
		}

		//create goroutine for each connect
		go process(conn)
	}
}

func process(conn net.Conn) {
	defer conn.Close()
	for {
		var buf [128]byte
		n, err := conn.Read(buf[:])

		if err != nil {
			fmt.Printf("read from connect failed, err: %v\n", err)
			break
		}
		str := string(buf[:n])
		fmt.Printf("receive from client, data: %v\n", str)
	}
}

　　

client端

main.go

package main

import (
	"bufio"
	"fmt"
	"net"
	"os"
	"strings"
)

func main() {
	conn, err := net.Dial("tcp", "localhost:9090")
	defer conn.Close()
	if err != nil {
		fmt.Printf("connect failed, err : %v\n", err.Error())
		return
	}

	inputReader := bufio.NewReader(os.Stdin)

	for {
		input, err := inputReader.ReadString('\n')
		if err != nil {
			fmt.Printf("read from console failed, err: %v\n", err)
			break
		}
		trimmedInput := strings.TrimSpace(input)
		if trimmedInput == "Q" {
			break
		}
		_, err = conn.Write([]byte(trimmedInput))

		if err != nil {
			fmt.Printf("write failed , err : %v\n", err)
			break
		}
	}
}

　　

分别编译执行服务端和客户端

客户端通过命令行与服务端简单交互