如何在Golang中使用reflect实现动态赋值_Golang reflect动态赋值方法汇总

var name string
v := reflect.ValueOf(&name).Elem() // 获取可设置的Value
if v.CanSet() {
    v.SetString("动态赋值")
}
fmt.Println(name) // 输出：动态赋值

type User struct {
    Name string
    Age  int
}

user := &User{}
val := reflect.ValueOf(user).Elem()

// 动态设置 Name
if field := val.FieldByName("Name"); field.IsValid() {
    if field.CanSet() {
        field.SetString("Alice")
    }
}

// 动态设置 Age
if field := val.FieldByName("Age"); field.IsValid() {
    if field.CanSet() {
        field.SetInt(25)
    }
}
fmt.Printf("%+v\n", *user) // {Name:Alice Age:25}

data := map[string]interface{}{
    "Name": "Bob",
    "Age":  30,
}

user := &User{}
val := reflect.ValueOf(user).Elem()
typ := val.Type()

for key, value := range data {
    fieldVal := val.FieldByName(key)
    if !fieldVal.IsValid() {
        continue // 字段不存在
    }
    if !fieldVal.CanSet() {
        continue // 字段不可设置
    }

    // 根据字段类型安全赋值
    switch fieldVal.Kind() {
    case reflect.String:
        if str, ok := value.(string); ok {
            fieldVal.SetString(str)
        }
    case reflect.Int, reflect.Int32, reflect.Int64:
        if num, ok := value.(int); ok {
            fieldVal.SetInt(int64(num))
        }
    }
}
fmt.Printf("%+v\n", *user)

type Address struct {
    City string
}

type Person struct {
    Name     string
    Addr     *Address
}

person := &Person{}
val := reflect.ValueOf(person).Elem()

// 处理 Addr 指针字段
addrField := val.FieldByName("Addr")
if addrField.Kind() == reflect.Ptr && addrField.IsNil() {
    newAddr := reflect.New(addrField.Type().Elem()) // 创建 *Address 指向的实例
    addrField.Set(newAddr)                          // 设置指针
}

// 赋值 City
addrField.Elem().FieldByName("City").SetString("Beijing")

value := "123"
field := val.FieldByName("Age") // 假设是 int 类型
if field.Kind() == reflect.Int {
    if i, err := strconv.Atoi(value); err == nil {
        field.SetInt(int64(i))
    }
}