验证是否在struct golang中设置了字段

type Person struct {
    Name string `json:"name" xml:"name"`
    Age  int    `json:"age" xml:"age"`
}

package main

import (
    "fmt"
    "reflect"
)

type Person struct {
    Name string `json:"name" xml:"name"`
    Age  int    `json:"age" xml:"age"`
}

func main() {
    p := Person{Name: "Alice", Age: 25}

    t := reflect.TypeOf(p)
    for i := 0; i < t.NumField(); i++ {
        field := t.Field(i)
        tag := field.Tag.Get("json")
        if tag == "" {
            fmt.Printf("Field %s does not have a json tag\n", field.Name)
        } else {
            fmt.Printf("Field %s has json tag: %s\n", field.Name, tag)
        }
    }
}

Field Name has json tag: name
Field Age has json tag: age