var addr = flag.String("addr", ":8080", "http server address")
//1.不带参数处理函数
func serveHome(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
http.ServeFile(w, r, "home.html")
}
//2.带参数处理函数,闭包函数隐式转换为http.HandlerFunc函数类型
func myHandler(s string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
http.ServeFile(w, r, s) //使用参数s
}
}
func main() {
flag.Parse()
//向默认路由注册处理器函数
http.HandleFunc("/", serveHome) //或http.Handle("/", http.HandlerFunc(serveHome))
http.Handle("/file",myHandler("somefile"))
err := http.ListenAndServe(*addr, nil) //启动监听,第二个参数nil表示使用默认路由DefaultServeMux中注册的处理器
if err != nil {
log.Fatalln("ListenAndServe: ", err)
}
}