Go语言_HTTP包

在Golang中写一个http web服务器大致是有两种方法：

1. 使用net包的net.Listen来对端口进行监听
2. 使用net/http包

这里是讨论如何使用net/http包创建一个web服务器

net/http请求提供了HTTP客户端和服务端的具体实现

http客户端

先看到的是Get，Post，PostForm三个函数。这三个函数直接实现了http客户端

import (
    "fmt"
    "net/http"
    "io/ioutil"
)
 
func main() {
    response,_ := http.Get("http://www.baidu.com")
    defer response.Body.Close()
    body,_ := ioutil.ReadAll(response.Body)
    fmt.Println(string(body))
}

除了使用这三个函数来建立一个简单客户端，还可以使用：
http.Client和http.NewRequest来模拟请求

package main
 
import (
    "net/http"
    "io/ioutil"
    "fmt"
)
 
func main() {
    client := &http.Client{}
    reqest, _ := http.NewRequest("GET", "http://www.baidu.com", nil)
     
    reqest.Header.Set("Accept","text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8")
    reqest.Header.Set("Accept-Charset","GBK,utf-8;q=0.7,*;q=0.3")
    reqest.Header.Set("Accept-Encoding","gzip,deflate,sdch")
    reqest.Header.Set("Accept-Language","zh-CN,zh;q=0.8")
    reqest.Header.Set("Cache-Control","max-age=0")
    reqest.Header.Set("Connection","keep-alive")
     
    response,_ := client.Do(reqest)
    if response.StatusCode == 200 {
        body, _ := ioutil.ReadAll(response.Body)
        bodystr := string(body);
        fmt.Println(bodystr)
    }
}

## 如何创建web服务端?

http包封装地非常bt，只需要两行!!：

 package main

import (
    "net/http"
)
 
func SayHello(w http.ResponseWriter, req *http.Request) {
    w.Write([]byte("Hello"))
}
 
func main() {
    http.HandleFunc("/hello", SayHello)
    http.ListenAndServe(":8001", nil)
 
}

进行端口的监听：http.ListenAndServe(":8001", nil)

注册路径处理函数：http.HandleFunc("/hello", SayHello)

处理函数：func SayHello(w http.ResponseWriter, req *http.Request)