Go TCP 编程

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package main

import (
	"bufio"
	"fmt"
	"net"
)

func main() {
	listen, err := net.Listen("tcp", "127.0.0.1:12345")
	if err != nil {
		fmt.Println("listen failed, err:", err)
		return
	}

	for {
		conn, err := listen.Accept() // 建立连接
		if err != nil {
			fmt.Println("accept failed, err:", err)
			continue
		}
		go process(conn)
	}

}

func process(conn net.Conn) {
	defer conn.Close() // 关闭连接
	for {
		reader := bufio.NewReader(conn)
		var buf [1024]byte
		n, err := reader.Read(buf[:])
		if err != nil {
			fmt.Println("read from client failed, err:", err)
			break
		}
		fmt.Println("recv from client：", string(buf[:n]))
		conn.Write(buf[:n])
	}
}

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package main

import (
	"fmt"
	"net"
)

func main() {
	conn, err := net.Dial("tcp", "127.0.0.1:12345")
	if err != nil {
		fmt.Println("err :", err)
		return
	}
	defer conn.Close()
	for {
		_, err = conn.Write([]byte("hello world")) // 发送数据
		if err != nil {
			return
		}
		buf := [512]byte{}
		n, err := conn.Read(buf[:])
		if err != nil {
			panic(err)
			return
		}
		fmt.Println(string(buf[:n]))
	}
}