service.go

package main

import (
    "net"
    "fmt"
)

// TCP service

func main() {
    // 1.监听本地端口
    linser, err := net.Listen("tcp", "127.0.0.1:27666")
    if err != nil{
        fmt.Println("Linsten 127.0.0.1:27666 faild, error of:", err)
        return
    }

    // 2.等待客户端连接
    client_conn, err := linser.Accept()
    if err != nil {
        fmt.Println("conn error of:", err)
        return
    }

    // 3.接收客户端信息
    var msg[128]byte
    n, err := client_conn.Read(msg[:])
    if err != nil {
        fmt.Println("Read error of:", err)
        return
    }
    fmt.Println("The client msg of:", string(msg[:n]))

    // 4.给客户端回应消息
    _, err =client_conn.Write([]byte("666!"))
    if err != nil{
        fmt.Println("Write err of:", err)
        return
    }

    client_conn.Close()
    linser.Close()
}

client.go

package main

import (
    "net"
    "fmt"
)

// TCP client

func main() {
    // 1.连接服务端
    conn_service, err := net.Dial("tcp", "127.0.0.1:27666")
    if err != nil {
        fmt.Println("conned 127.0.0.1:27666 faild of:", err)
        return
    }

    // 2.给服务端发生消息
    _, err = conn_service.Write([]byte("Hello World!"))
    if err != nil {
        fmt.Println("Wirte err of: ", err)
        return
    }

    // 3.接收服务端消息
    var msg [128]byte // 声明一个接收信息的变量
    n, err := conn_service.Read(msg[:])
    if err != nil {
        fmt.Println("Read error of:", err)
        return
    }
    fmt.Println("The service msg:",string(msg[:n]))

    // 4.关闭连接
    conn_service.Close()
}