Golang——net/http

構建一個web

在瀏覽器輸入http://localhost:8080

import (    "net/http"    "fmt"    "log")func sayhelloGolang(w http.ResponseWriter, r *http.Request) {    r.ParseForm()  //解析參數，預設是不會解析的    fmt.Println("path", r.URL.Path)    w.Write([]byte("Hello Golang"))}func main() {    http.HandleFunc("/", sayhelloGolang) //設定訪問的路由    err := http.ListenAndServe(":8080", nil) //設定監聽的連接埠    if err != nil {        log.Fatal("ListenAndServe: ", err)    }}

繼承ServeHTTP

type  BaseHander struct {    }func (hander *BaseHander)ServeHTTP(resp http.ResponseWriter,req *http.Request){      fmt.Println("url path=>",req.URL.Path)      fmt.Println("url param a =>",req.URL.Query().Get("a"))      resp.Write([]byte("hello world"))}func main() {    http.ListenAndServe(":8080",&BaseHander{});}

net/http 路由

package muximport (    "net/http")type muxHandler struct {    handlers    map[string]http.Handler    handleFuncs map[string]func(resp http.ResponseWriter, req *http.Request)}func NewMuxHandler() *muxHandler {    return &muxHandler{        make(map[string]http.Handler),        make(map[string]func(resp http.ResponseWriter, req *http.Request)),    }}func (handler *muxHandler) ServeHTTP(resp http.ResponseWriter, req *http.Request) {    urlPath := req.URL.Path    if hl, ok := handler.handlers[urlPath]; ok {        hl.ServeHTTP(resp, req)        return    }    if fn, ok := handler.handleFuncs[urlPath]; ok {        fn(resp, req)        return    }    http.NotFound(resp, req)}func (hander *muxHandler) Handle(pattern string, hl http.Handler) {    hander.handlers[pattern] = hl}func (handler *muxHandler) HandleFunc(pattern string, fn func(resp http.ResponseWriter, req *http.Request)) {    handler.handleFuncs[pattern] = fn}

var (    port string)func main() {    flag.StringVar(&port, "port", ":8080", "port to listen")    flag.Parse()    router :=mux.NewMuxHandler()    router.Handle("/hello/golang/", &BaseHander{})    router.HandleFunc("/hello/world", func(resp http.ResponseWriter, req *http.Request) {        resp.Write([]byte("hello world"))    })    http.ListenAndServe(port, router)}