如何在函数中将结构字段作为参数传递以显示 json 数据？

Question

我正在做一个项目来显示 json 数据并检查它们是否是闰年。我正在尝试为IsLeapYear创建一个参数，以便在进行测试时可以传入一些 json 值，我尝试使用User指向结构的指针，以便可以传入函数参数中的字段，但它不起作用.如何在函数参数中传递来自 user.json 的 json 数据，这样我可以更轻松地进行测试？只是为了让您知道，我的测试文件中出现错误，因为我创建了 DateTest 字符串，但IsLeapYear不是字符串。这是我的代码：main.go：  package mainimport (    "encoding/json"    "fmt"    "io/ioutil"    "log"    "os"    "time")// Users struct which contains// an array of userstype Users struct {    Users []User `json:"users"`}// User struct which contains a name// a type and a list of social linkstype User struct {    Firstname  string `json:"fname"`    Secondname string `json:"lname"`    Date       string `json:"date"`}var users Usersfunc Birthday() {    // Open our jsonFile    jsonFile, err := os.Open("users.json")    // if we os.Open returns an error then handle it    if err != nil {        fmt.Println(err)    }    fmt.Println("Successfully Opened users.json")    // defer the closing of our jsonFile so that we can parse it later on    defer jsonFile.Close()    // read our opened xmlFile as a byte array.    byteValue, _ := ioutil.ReadAll(jsonFile)    // we initialize our Users array    // we unmarshal our byteArray which contains our    // jsonFile's content into 'users' which we defined above    json.Unmarshal(byteValue, &users)    IsLeapYear(&users{Firstname: ""}, &users{Secondname: ""}) ---> passing the users fileds }func IsLeapYear(firstname *Users, secondname *Users) {    // we iterate through every user within our users array and    // print out the user Type, their name    for i := 0; i < len(users.Users); i++ {        date, err := time.Parse("2006/01/02", users.Users[i].Date)        if err != nil {            date, err = time.Parse("2006-01-02", users.Users[i].Date)            // date, err = time.Parse("2006 01 02", users.Users[i].Date)            if err != nil {                log.Fatal("unsupported date format:", err)            }        }

Answer 1

在这里，我清理了你的代码。现在测试应该更容易编写

package main

import (

    "encoding/json"

    "fmt"

    "io/ioutil"

    "log"

    "os"

    "time"

)

// Data struct which contains

// an array of users

type Data struct {

    Users []User `json:"users"`

}

// User struct which contains the first + last name and the birthdate

type User struct {

    FirstName  string `json:"first_name"`

    LastName string `json:"last_name"`

    Date       string `json:"date"`

}

func IsLeapYear(date time.Time) bool {

    return date.Day()%400 == 0 || (date.Day()%4 == 0 && date.Day()%100 != 0)

}

func parseDate(date string) time.Time {

    parsedDate, err := time.Parse("2006/01/02", date)

    if err != nil {

        parsedDate, err = time.Parse("2006-01-02", date)

        if err != nil {

            log.Fatal("unsupported date format:", err)

        }

    }

    return parsedDate

}

func CheckBirthdateOf(user User) {

    date := parseDate(user.Date)

    fmt.Println("User Date: " + user.Date)

    fmt.Println("User First Name: " + user.FirstName)

    fmt.Println("User Last Name: " + user.LastName)

    if IsLeapYear(date) {

        fmt.Println(user.Date, "is a Leap Year ✨ ✨ ✨")

        if date.Day() == time.Now().Day() {

            fmt.Println("TODAY IS YOUR BIRTHDAY AND A Leap YEAR, Happy birthday !!!🎉 🎉 🍾 🍾 ")

        } else {

            fmt.Println("TODAY IS NOT YOUR BIRTHDAY, but it's a leap year..!!! 👍 👍 👍 ")

        }

    } else {

        fmt.Println(user.Date, " is Not a Leap Year 💥 💥 💥 ")

        fmt.Println("Your Date is neither a leap year nor your birthday..!!! 😔😔😔")

    }

    fmt.Println("")

}

func main() {

    jsonFile, err := os.Open("users.json")

    if err != nil {

        panic(err)

    }

    fmt.Println("Successfully Opened users_data.json")

    defer jsonFile.Close()

    byteValue, _ := ioutil.ReadAll(jsonFile)

    var usersData Data

    json.Unmarshal(byteValue, &usersData)

    for _, user := range usersData.Users {

        CheckBirthdateOf(user)

    }

}