Golang反射调用结构体方法示例

package main

import "fmt"

type User struct {
    Name string
    Age  int
}

func (u User) SayHello() {
    fmt.Println("Hello, I'm", u.Name)
}

func (u User) Introduce(place string) {
    fmt.Printf("I'm %s, I'm from %s\n", u.Name, place)
}

func (u *User) SetName(name string) {
    u.Name = name
}

import (
    "fmt"
    "reflect"
)

func main() {
    user := User{Name: "Alice", Age: 25}
    userType := reflect.TypeOf(user)
    userValue := reflect.ValueOf(user)
    // 如果想调用指针方法（如 SetName），需传入指针
    userPtrValue := reflect.ValueOf(&user)

    fmt.Printf("Struct has %d methods\n", userType.NumMethod())

    for i := 0; i < userType.NumMethod(); i++ {
        method := userType.Method(i)
        fmt.Printf("Method %d: %s\n", i, method.Name)

        // 根据方法名判断是否为指针方法，或统一使用指针调用
        switch method.Name {
        case "SayHello":
            userValue.MethodByName("SayHello").Call(nil)
        case "Introduce":
            args := []reflect.Value{reflect.ValueOf("Beijing")}
            userValue.MethodByName("Introduce").Call(args)
        case "SetName":
            args := []reflect.Value{reflect.ValueOf("Bob")}
            userPtrValue.MethodByName("SetName").Call(args)
        }
    }

    fmt.Printf("Final name: %s\n", user.Name) // 输出 Bob
}