package main

import (
    "fmt"
    "net"
)

func main() {
    // 1.创建监听
    ip := "127.0.0.1"
    port := 8080
    address := fmt.Sprintf("%s:%d", ip, port)
    server, err := net.Listen("tcp", address)
    defer server.Close()
    if err != nil {
        fmt.Println("net.Listen err", err)
        return
    }
    fmt.Println("Listening...", "tcp", address)
    for {
        // 2.接收连接
        conn, err := server.Accept()
        if err != nil {
            fmt.Println("server.Accept err", err)
            return
        }
        go func() {
            // 3.读取数据
            buf := make([]byte, 1024)
            n, err := conn.Read(buf)
            if err != nil {
                fmt.Println("conn.Read err", err)
                return
            }
            fmt.Println("Clinet ====> Server ", "len:", n, " 数据：", string(buf))

            // 4.给客户端发送数据
            data := "Server Ok"
            n, err = conn.Write([]byte(data))
            fmt.Println("Server ====> Client", "len:", n, " 数据：", data)
        }()
    }
}

package main

import (
    "fmt"
    "net"
    "strconv"
    "time"
)

func main() {
    count := 0
    for {
        count += 1
        // 1.建立连接
        conn, err := net.Dial("tcp", ":8080")
        if err != nil {
            fmt.Println("conn  err", err)
            return
        }
        defer conn.Close()
        time.Sleep(1 * time.Second)

        // 2.发送数据
        data := "Hello Server" + strconv.Itoa(count)
        n, err := conn.Write([]byte(data))
        fmt.Println("Clinet ====> Server", "len:", n, " 数据：", data)

        // 3.接收数据
        buf := make([]byte, 1024)
        n, err = conn.Read(buf)
        if err != nil {
            fmt.Println("conn.Read err", err)
            return
        }
        fmt.Println("Server ====> Clinet", "len:", n, " 数据：", string(buf))
    }
}