golang实现简单tcp的server端和client端

服务端server.go

package main

import (
	"fmt"
	"net"
)



func main() {
	listen, err := net.Listen("tcp", "0.0.0.0:20000")
	if err != nil {
		fmt.Println("listen failed,err:", err)
		return
	}
	for {
		conn, err := listen.Accept()
		if err != nil {
			fmt.Println("accept failed,err:%vn", err)
			continue
		}
		go process(conn)
	}

}

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

		str := string(buf[:n])
		fmt.Printf("recv from client, data: %vn", str)
	}

}

客户端client.go

package main

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



func main() {
	conn,err := net.Dial("tcp","0.0.0.0:20000")
	if err != nil {
		fmt.Println("dail failed, err :",err)
		return
	}
	reader := bufio.NewReader(os.Stdin)
	for {
		data, err := reader.ReadString('n')
		if err != nil {
			fmt.Printf("read from console,err: %vn",err)
			break
		}
		data = strings.TrimSpace(data)
		_ ,err = conn.Write([]byte(data))
		if err != nil {
			fmt.Printf("write failed ,err:%vn",err)
			break
		}
	}
}

============================================================================

http服务器

package main

import "net/http"

func main() {
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("hello world!"))
	})
	http.ListenAndServe(":9090",nil)
}

================================================================================================
package main

import (
	"fmt"
	"net/http"
)
func sayhello(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte("hello world!"))
	fmt.Fprintf(w,"%vn",r.Form)
	fmt.Fprintf(w,"path:%sn",r.URL.Path)
	fmt.Fprintf(w,"scheman",r.URL.Scheme)
	fmt.Fprintf(w,"hello world!n")
}
func main() {
	http.HandleFunc("/", sayhello)
	http.ListenAndServe(":9090",nil)
}