duck typeing
隐式的实现接口的方法就等于实现了接口
main函数
package main
import (
"fmt"
"learngo/retriever/mock"
"learngo/retriever/real"
)
func main(){
var r Retriever
r = mock.Retriever{"this is fyf"}
r = real.Retriever{}
fmt.Println(download(r))
}
//interface中的函数不用加func
type Retriever interface {
Get(url string) string
}
func download(r Retriever) string{
return r.Get("http://www.imooc.com")
}
实现接口一
package mock
type Retriever struct {
Contents string
}
//go语言中实现了Get(url string)，就被认为实现了Retriever接口
func (r Retriever) Get(url string) string {
return r.Contents
}
实现接口二（拿下慕课网首页）
package real
import (
"time"
"net/http"
"net/http/httputil"
)
type Retriever struct {
UserAgent string
TimeOut time.Duration
}
func (r Retriever) Get(url string) string {
resp , err :=http.Get(url)
if err != nil{
panic(err)
}
result,err := httputil.DumpResponse(resp,true)
resp.Body.Close()
if err != nil {
panic(err)
}
return string(result)
}