golang of network development

1. TCP Server / Client Development

net package provides network I / O development interface, including the TCP / the IP , the UDP , the DNS , and the Unix Domain Sockets .

Common development generally only need the most basic interface or function:

Server: net.Listen () , net.Accept ()

ln, err := net.Listen("tcp", ":8080")
if err != nil {
    // handle error
}
for {
    conn, err := ln.Accept()
    if err != nil {
        // handle error
    }
    go handleConnection(conn)
}

Client: net.Dial ()

conn, err := net.Dial("tcp", "golang.org:80")
if err != nil {
    // handle error
}
fmt.Fprintf(conn, "GET / HTTP/1.0\r\n\r\n")
status, err := bufio.NewReader(conn).ReadString('\n')
// ...

Related API definitions:

func Listen(network, address string) (Listener, error)
func (l *TCPListener) Accept() (Conn, error)
func Dial(network, address string) (Conn, error)

2. web development

net / http package for eb provide support to develop, can very easily on the Web routing, static files, templates, the cookie data such as setup and operation.

Mainly two steps: set the access route, set the listening port.

func HandleFunc(pattern string, handler func(ResponseWriter, *Request))
func ListenAndServe(addr string, handler Handler) error
func HFunc(w http.ResponseWriter, req *http.Request)

Example applications are as follows:

Import (
     " FMT " 
    " NET / HTTP " 
    " strings " 
    " log " 
) 

FUNC main () { 
    http.HandleFunc ( " / " , sayhelloName)   // set access route 
    ERR: = http.ListenAndServe ( " : 9090 " , nil ) // set the listen port 
    IF ERR =! nil { 
        log.Fatal ( " ListenAndServe: " , ERR) 
    } 
} 

FUNC sayhelloName (http.ResponseWriter W, R & lt * http.Request){
    r.ParseForm ()
    fmt.Println("---------------")
    fmt.Println(r.Form)
    fmt.Println("path:", r.URL.Path)
    fmt.Println("scheme:", r.URL.Scheme)
    fmt.Println(r.Form["url_long"])
    fmt.Println("====")
    for k, v := range r.Form{
        fmt.Println("key:", k)
        fmt.Println("val:", strings.Join(v, " "))
    }
    fmt.Fprintf(w, "Hello wang!")
}

  

reference:

1. https://golang.google.cn/pkg/net/

2. https://www.kancloud.cn/kancloud/the-way-to-go/165098 Go Getting Started Guide

3. http://wiki.jikexueyuan.com/project/go-web-programming/03.3.html Go Web Programming

4. Writing Web Applications