Golang reflect.MethodByName动态方法调用示例

package main

import "fmt"

type User struct {
    Name string
    Age  int
}

func (u *User) SayHello() {
    fmt.Printf("Hello, I'm %s, %d years old.\n", u.Name, u.Age)
}

func (u *User) SetName(name string) {
    u.Name = name
    fmt.Printf("Name updated to: %s\n", u.Name)
}

func (u *User) GetInfo() string {
    return fmt.Sprintf("User: %s, Age: %d", u.Name, u.Age)
}

import (
    "reflect"
)

func main() {
    user := &User{Name: "Alice", Age: 25}

    // 获取结构体指针的 reflect.Value
    v := reflect.ValueOf(user)

    // 调用无参数方法：SayHello
    method1 := v.MethodByName("SayHello")
    if method1.IsValid() {
        method1.Call(nil) // 无参数，传 nil
    }

    // 调用有参数方法：SetName
    method2 := v.MethodByName("SetName")
    if method2.IsValid() {
        args := []reflect.Value{reflect.ValueOf("Bob")}
        method2.Call(args)
    }

    // 调用返回值方法：GetInfo
    method3 := v.MethodByName("GetInfo")
    if method3.IsValid() {
        result := method3.Call(nil)
        fmt.Println("GetInfo returned:", result[0].String())
    }
}

Hello, I'm Alice, 25 years old.
Name updated to: Bob
GetInfo returned: User: Bob, Age: 25