Golang HTTP请求Body解析与数据绑定示例

func handler(w http.ResponseWriter, r *http.Request) {
    if r.Method != "POST" {
        http.Error(w, "仅支持POST方法", http.StatusMethodNotAllowed)
        return
    }

    body, err := io.ReadAll(r.Body)
    if err != nil {
        http.Error(w, "读取Body失败", http.StatusBadRequest)
        return
    }
    defer r.Body.Close()

    fmt.Printf("接收到的数据: %s\n", body)
}

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

func createUser(w http.ResponseWriter, r *http.Request) {
    var user User
    decoder := json.NewDecoder(r.Body)
    
    if err := decoder.Decode(&user); err != nil {
        http.Error(w, "解析JSON失败: "+err.Error(), http.StatusBadRequest)
        return
    }
    defer r.Body.Close()

    // 此处可进行业务逻辑处理
    fmt.Printf("创建用户: %+v\n", user)
    w.WriteHeader(http.StatusCreated)
    json.NewEncoder(w).Encode(map[string]string{"status": "success"})
}

func handleForm(w http.ResponseWriter, r *http.Request) {
    if err := r.ParseForm(); err != nil {
        http.Error(w, "解析表单失败", http.StatusBadRequest)
        return
    }

    user := User{
        Name:  r.FormValue("name"),
        Email: r.FormValue("email"),
        Age:   int(r.Form.Get("age")), // 注意类型转换
    }

    fmt.Printf("表单用户: %+v\n", user)
}

if user.Name == "" || user.Email == "" {
    http.Error(w, "缺少必要字段", http.StatusBadRequest)
    return
}