Golang结构体方法与字段动态访问示例

package main
<p>import "fmt"</p><p>type User struct {
Name string
Age  int
}</p><p>func (u *User) SetName(name string) {
u.Name = name
fmt.Printf("Name set to: %s\n", u.Name)
}</p><p>func (u User) GetName() string {
return u.Name
}</p>

import (
    "fmt"
    "reflect"
)
<p>func accessFields(u <em>User) {
v := reflect.ValueOf(u).Elem() // 获取指针指向的元素
t := reflect.TypeOf(</em>u)</p><pre class='brush:php;toolbar:false;'>for i := 0; i < v.NumField(); i++ {
    field := t.Field(i)
    value := v.Field(i)

    fmt.Printf("字段名: %s, 类型: %s, 值: %v\n",
        field.Name, field.Type, value.Interface())
}

// 修改字段值（必须是指针可寻址）
if v.FieldByName("Age").CanSet() {
    v.FieldByName("Age").SetInt(30)
}

func callMethod(u *User, methodName string, args ...interface{}) {
    v := reflect.ValueOf(u)
    method := v.MethodByName(methodName)
<pre class='brush:php;toolbar:false;'>if !method.IsValid() {
    fmt.Printf("方法 %s 不存在\n", methodName)
    return
}

in := make([]reflect.Value, len(args))
for i, arg := range args {
    in[i] = reflect.ValueOf(arg)
}

result := method.Call(in)
for _, r := range result {
    fmt.Printf("返回值: %v\n", r.Interface())
}

func main() {
    user := &User{Name: "Alice", Age: 25}
<pre class='brush:php;toolbar:false;'>fmt.Println("--- 字段信息 ---")
accessFields(user)

fmt.Println("--- 调用 SetName ---")
callMethod(user, "SetName", "Bob")

fmt.Println("--- 调用 GetName ---")
callMethod(user, "GetName")

--- 字段信息 ---
字段名: Name, 类型: string, 值: Alice
字段名: Age, 类型: int, 值: 25
--- 调用 SetName ---
Name set to: Bob
--- 调用 GetName ---
返回值: Bob