Golang——socket

package main

import (
    "bufio"
    "fmt"
    "io"
    "net"
    "time"
)

func main() {
    var tcpAddr *net.TCPAddr
    tcpAddr,_ = net.ResolveTCPAddr("tcp","127.0.0.1:9999")

    conn,err := net.DialTCP("tcp",nil,tcpAddr)

    if err!=nil {
        fmt.Println("Client connect error ! " + err.Error())
        return
    }else {
        fmt.Println(conn.LocalAddr().String() + "客户端连接成功!")
    }

    defer conn.Close()
    // 向服务器发送数据
    reader := bufio.NewReader(conn)
    conn.Write([]byte("hi server \n"))
    for {
        // 接受服务器返回数据
        msg, err := reader.ReadString('\n')
        fmt.Println(msg)
        if err != nil || err == io.EOF {
            fmt.Println(err)
            break
        }
        time.Sleep(time.Second * 2)

        b := []byte(fmt.Sprintf("client time:%s\n",time.Now().String()))
        _, err = conn.Write(b)

        if err != nil {
            fmt.Println(err)
            break
        }
    }
}

package main

import (
    "bufio"
    "fmt"
    "io"
    "net"
    "time"
)

//tcp server 

func main() {
    //定义一个tcp断点
    var tcpAddr *net.TCPAddr
    //通过ResolveTCPAddr实例一个具体的tcp断点
    tcpAddr,_ = net.ResolveTCPAddr("tcp",":9999")
    //打开一个tcp断点监听
    tcpListener,err:= net.ListenTCP("tcp",tcpAddr)
    if err !=nil{
        panic(err)
    }
    defer tcpListener.Close()
    fmt.Println("server start success")
    //循环接收客户端的连接，创建一个协程具体去处理连接
    for{
        tcpConn,err := tcpListener.AcceptTCP()
        if err!=nil {
            fmt.Println(err)
            continue
        }
        fmt.Println(tcpConn.RemoteAddr().String()+"connect success")
        go tcpPipe(tcpConn)
    }
}

//具体处理连接过程方法
func tcpPipe(conn *net.TCPConn){
    //tcp连接的地址
    ipStr := conn.RemoteAddr().String()

    defer func() {
        fmt.Println(" Disconnected : " + ipStr)
        conn.Close()
    }()
    //获取一个连接的reader读取流
    reader := bufio.NewReader(conn)
    for {
        message,_,err := reader.ReadLine()
        if err!=nil || err == io.EOF {
            break
        }
        fmt.Println(string(message))

        time.Sleep(time.Second*3)
        
        b := []byte(fmt.Sprintf("server time:%s\n",time.Now().String()))

        conn.Write(b)
        
    }
}