Go 语言实现 HTTP.POST 方法及实战应用

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

func sendPostRequest() {
// 定义要访问的目标 URL 和 Post 数据体
url := "http://example.com/api/resource"
payload := strings.NewReader(`{"key": "value"}`) // JSON 格式的 post body

// 准备客户端和 Request 对象
client := &http.Client{}
req, err := http.NewRequest(http.MethodPost, url, payload)

if err != nil {
fmt.Println(err)
return
}

// 设置 Content-Type 头部为 application/json 表明我们正在传输的是JSON格式的数据。
req.Header.Add("Content-Type", "application/json")

// 发送请求并接收响应
resp, err := client.Do(req)

if err != nil {
panic(err.Error())
}

defer resp.Body.Close()

// 解析返回的内容
responseBodyBytes, _ := ioutil.ReadAll(resp.Body)
responseString := string(responseBodyBytes)
fmt.Printf("Response Body: %s\n", responseString)
}

// 假设已经获得了access_token等必要凭证
const accessToken = "<your-access-token>"
var wechatUrl = fmt.Sprintf("https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token=%s", accessToken)

type WeChatMessage struct {
ToUser string `json:"touser"`
MsgType string `json:"msgtype"`
Text MessageText `json:"text,omitempty"`
}

type MessageText struct{
Content string `json:"content"`
}

func sendMessage(toUser string, content string){
messageData := WeChatMessage{ToUser: toUser,MsgType: "text"}
textPayload := MessageText{Content: content}
messageData.Text = textPayload

jsonStr, _ := json.Marshal(messageData)
requestBody := bytes.NewBuffer(jsonStr)

request, err := http.NewRequest(
http.MethodPost,
wechatUrl,
requestBody,
)

if err!=nil{
log.Fatal(err)
}

request.Header.Set("Content-Type","application/json")
client:=&http.Client{}

resp,err :=client.Do(request)
defer resp.Body.Close()

if err != nil {
log.Fatalf("Error sending msg :%v",err)
return
}else{
fmt.Println("Successfully sent the message!")
}
}