Go适配器

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函数适配器

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package main
import "net/http"
type Adapter func(http.ResponseWriter, *http.Request)
func (a Adapter) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    a(w, r) //在这个例子中a 等于handler w和r是传入的值
}
func main() {
    http.Handle("/", Adapter(handler)) //http.Handle第二个参数要求实现http.Handle 通过Adapter(handler)将handler转为Adapter类型 又由于Adapter类型实现了http.Handler 所以此时handler也实现了http.Handler
    http.ListenAndServe(":8000", nil)
}
func handler(w http.ResponseWriter, r *http.Request) {
    w.WriteHeader(http.StatusOK)
    w.Write([]byte("nihao"))
}