知识点 路由

package demo_route_mux_default

import (
   "fmt"
   "log"
   "os"
   "os/signal"
   "time"

   //"net"
   "net/http"
)

func (*Hello) HelloServer1(w http.ResponseWriter, req *http.Request) {

   fmt.Fprint(w, "hello world1")
}
func (*Hello) HelloServer2(w http.ResponseWriter, req *http.Request) {

   fmt.Fprint(w, "hello world2")
}

func (*Hello) ServeHTTP(w http.ResponseWriter, req *http.Request) {

   fmt.Fprint(w, "hello world0")
}

type Hello struct {
}

func main() {
   mux := http.NewServeMux()
   mux.Handle("/", &Hello{})
   mux.HandleFunc("/test", (&Hello{}).HelloServer1)
   mux.HandleFunc("/test2", (&Hello{}).HelloServer2)
   //http.HandleFunc("/test", HelloServer1)
   err := http.ListenAndServe(":8080", mux)
   if err != nil {
      log.Fatal("ListenAndServe: ", err.Error())
   }
}

第三类（更底层）
package main

import (
   "log"
   "net/http"
   "os"
   "os/signal"
   "time"
)

func main() {
   server := &http.Server{
      Addr:         ":4000",
      WriteTimeout: time.Second * 2, // 4
   }

   quit := make(chan os.Signal)
   signal.Notify(quit, os.Interrupt)

   mux := http.NewServeMux()
   mux.Handle("/", &myHandler{})
   mux.HandleFunc("/bye", sayBye)

   go func() {
      <-quit

      if err := server.Close(); err != nil {
         log.Fatal("Close server:", err)
      }
   }()

   server.Handler = mux
   log.Print("Starting server... v3")
   err := server.ListenAndServe()
   if err != nil {
      if err == http.ErrServerClosed {
         log.Print("Server closed under request")
      } else {
         log.Fatal("Server closed unexpected")
      }
   }
}

func sayBye(w http.ResponseWriter, r *http.Request) {
   time.Sleep(3 * time.Second)
   w.Write([]byte("Bye bye this is version 3!"))
}

type myHandler struct{}

func (*myHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
   w.Write([]byte("Hello v3, the request URL is: " + r.URL.String()))
第一类
package main

import (
   "log"
   "net/http"
)

func main() {
   mux := http.NewServeMux()
   mux.Handle("/", &myHandler{})
   mux.HandleFunc("/bye", sayBye)

   log.Println("Starting server... v2")
   log.Fatal(http.ListenAndServe(":4000", mux))
}

func sayBye(w http.ResponseWriter, r *http.Request) {
   w.Write([]byte("Bye bye this is version 2!"))
}

type myHandler struct{}

func (*myHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
   w.Write([]byte("Hello v2, the request URL is: " + r.URL.String()))
}