net/http包简介

net/http包提供了一个简单的HTTP服务器。有时我们需要对第三方的API进行请求时，可以使用net/http包。

实现http请求

Get

Get请求示例

package main

import (
	"fmt"
	"io/ioutil"
	"net/http"
)

func main() {
	resp, err := http.Get("http://www.baidu.com/")
	if err != nil {
		fmt.Println("get failed, err:", err)
		return
	}
	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		fmt.Println("read from resp.Body failed,err:", err)
		return
	}
	fmt.Print(string(body))
}

带body参数和Hearder的Get请求

net/http包没有封装请求带header的get或者post方法，所以，要想请求中带header，只能使用NewRequest方法。不带header的请求也可以使用此方法。

package main

import (
	"fmt"
	"io/ioutil"
	"net/http"
)

func main() {
	client := &http.Client{}
	apiURL := "http://127.0.0.1:8080/get"

	req, err := http.NewRequest("GET", apiURL, nil)
	//添加查询参数
	q := req.URL.Query()
	q.Add("username", "admin")
	q.Add("password", "123")
	req.URL.RawQuery = q.Encode()
	fmt.Println(req.URL.String())

	req.Header.Add("Content-Type", "application/json")

	if err != nil {
		fmt.Printf("post failed, err:%v\n\n", err)
		return
	}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	b, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		fmt.Printf("get resp failed,err:%v\n\n", err)
		return
	}
	fmt.Println(string(b))
}

输出：
http://127.0.0.1:8080/get?password=123&username=admin
{"status": "ok"}

Post

带body参数和Hearder的Post请求

package main

import (
   "fmt"
   "net/http"
   "io/ioutil"
   "strings"
   "encoding/json"
   "log"
)

// OsInfo 系统信息
type OsInfo struct {
	BootTime      string  //开机时间
	OsName        string  //系统名称
	Version       string  //版本信息
	UploadSpeed   string  //上传速度
	DownloadSpeed string  //下载速度

}

func main() {
   url := "http://127.0.0.1:8088/tempapi/osInfo"
   osInfo :=OsInfo{
     BootTime:"2022-03-01 00:00:00",
      OsName:"darwin",
      Version:"11.6.1",
      UploadSpeed:"503.1KB/s",
      DownloadSpeed:"11.6MB/s",

   }
   jsons,_:=json.Marshal(teamworkinfo)
   result :=string(jsons)
   jsoninfo :=strings.NewReader(result)

   req, _ := http.NewRequest("POST", url,jsoninfo)
   req.Header.Add("appCode", "winner")
   req.Header.Add("token", "466221e4-593d-4bb8-b41b-hcfedhf")//应用对接的token
   req.Header.Add("Content-Type", "application/json")
   res, err := http.DefaultClient.Do(req)
   if  err !=nil{
      log.Printf("调用接口异常%v",err.Error())
   }
   defer res.Body.Close()
   body, err := ioutil.ReadAll(res.Body)
   if  err !=nil{
      log.Printf("调用接口异常%v",err.Error())
   }

   //fmt.Println(res)
   fmt.Println(string(body))

}