golang net/http包使用

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

 package main
 ?
 import (
     "fmt"
     "net/http"
 )
 ?
 func hello(w http.ResponseWriter, r *http.Request) {
     fmt.Fprintf(w, "Hello!")
 }
 ?
 func main() {
     http.HandleFunc("/hello", hello)
     http.ListenAndServe(":8080", nil)
 }