Golang——net/http

构建一个web

在浏览器输入http://localhost:8080

import (
    "net/http"
    "fmt"
    "log"
)

func sayhelloGolang(w http.ResponseWriter, r *http.Request) {
    r.ParseForm()  //解析参数，默认是不会解析的
    fmt.Println("path", r.URL.Path)
    w.Write([]byte("Hello Golang"))
}

func main() {
    http.HandleFunc("/", sayhelloGolang) //设置访问的路由
    err := http.ListenAndServe(":8080", nil) //设置监听的端口
    if err != nil {
        log.Fatal("ListenAndServe: ", err)
    }
}

继承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 mux

import (
    "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)

}