Golang反射获取结构体字段方法详解

type User struct {
    Name string
    Age  int
    City string
}

u := User{Name: "Alice", Age: 25, City: "Beijing"}
v := reflect.ValueOf(u)

v := reflect.ValueOf(&u).Elem()

nameField := v.FieldByName("Name")
if nameField.IsValid() {
    fmt.Println("Name:", nameField.String())
}

ageField := v.FieldByName("Age")
if ageField.IsValid() {
    fmt.Println("Age:", ageField.Int())
}

type User struct {
    Name string
    age  int  // 小写字段，非导出
}

field := v.FieldByName("UnknownField")
if !field.IsValid() {
    fmt.Println("字段不存在")
}

package main

import (
    "fmt"
    "reflect"
)

type User struct {
    Name string
    Age  int
    City string
}

func main() {
    u := User{Name: "Bob", Age: 30, City: "Shanghai"}
    v := reflect.ValueOf(u)

    if name := v.FieldByName("Name"); name.IsValid() {
        fmt.Println("Name:", name.String())
    }

    if age := v.FieldByName("Age"); age.IsValid() {
        fmt.Println("Age:", age.Int())
    }

    if city := v.FieldByName("City"); city.IsValid() {
        fmt.Println("City:", city.String())
    }

    if invalid := v.FieldByName("Email"); !invalid.IsValid() {
        fmt.Println("Email 字段不存在")
    }
}