Golang发送JSON结构体请求教程

type User struct {
    Name  string `json:"name"`
    Email string `json:"email"`
    Age   int    `json:"age"`
}

user := User{Name: "张三", Email: "zhang@example.com", Age: 28}
jsonData, err := json.Marshal(user)
if err != nil {
    log.Fatal(err)
}
req, err := http.NewRequest("POST", "https://api.example.com/users", bytes.NewBuffer(jsonData))
if err != nil {
log.Fatal(err)
}
req.Header.Set("Content-Type", "application/json")

client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
    log.Fatal(err)
}
defer resp.Body.Close()
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
log.Fatalf("HTTP error: %d", resp.StatusCode)
}
body, _ := io.ReadAll(resp.Body)
var result map[string]interface{}
json.Unmarshal(body, &result)
fmt.Printf("Response: %+v\n", result)

func PostJSON(url string, payload interface{}) (*http.Response, error) {
    jsonData, err := json.Marshal(payload)
    if err != nil {
        return nil, err
    }
    req, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
    if err != nil {
        return nil, err
    }
    req.Header.Set("Content-Type", "application/json")
return &http.Client{Timeout: 5 * time.Second}.Do(req)
}

resp, err := PostJSON("https://api.example.com/users", User{
    Name:  "李四",
    Email: "li@example.com",
    Age:   30,
})
if err != nil {
    log.Fatal(err)
}
defer resp.Body.Close()