通过这个例子会学习到

• 接口定义：type <名称> interface
• 结构体定义： type <名称> struct
• 接口组合

type ReceiverPoster interface {
	Receiver
	Poster
}

• 发下工具入门用法

httputil.DumpResponse方法
http.get方法
panic(err)
defer resp.Body.Close()
...

• 规范的应用

  • 每个目录可以是一个单独的包

  • 包名和目录名保保持一致

  • main包比较特色

  • 首字母大写代码public，首字母小写代码私有变化

程序结构

project
   mock/
      - mock.go
   real/
      - real.go
   - main.go

代码

project/mock/mock.go

package mock

type Receiver struct {
	Contents string
}

func (r Receiver) Get(url string) string {
	return r.Contents
}

project/real/real.go

package real

import (
	"net/http"
	"net/http/httputil"
	"time"
)

type Receiver struct {
	UserAgent string
	TimeOut time.Duration
}

func (r Receiver) 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)
}

project/main.go

package main

import (
	"carmen.com/study/receiver/mock"
	real2 "carmen.com/study/receiver/real"
	"fmt"
)

type Receiver interface {
	Get(url string) string
}

type Poster interface {
	Post(url string,form map[string]string) string
}

func download(r Receiver) string  {
	return r.Get("http://www.imooc.com")
}

func post(poster Poster)  {
	poster.Post("http://www.imooc.com", map[string]string{"name":"nian","course":"golang"})
}

type ReceiverPoster interface {
	Receiver
	Poster
}

func session(s ReceiverPoster)  {
	s.Post("http://www.imooc.com", map[string]string{"name":"nian","course":"golang"})
	s.Get("http://www.imooc.com")
}

func main() {
	var r Receiver
	r = mock.Receiver{"aa"}
	r = real2.Receiver{"www.imooc.com",0}

	var s ReceiverPoster
	s.Get("http://www.imooc.com")
	s.Post("http://www.imooc.com", map[string]string{"name":"nian","course":"golang"})
	fmt.Println(download(r))
}