切片、map 转 struct

map to struct

package interfce_to_struct

import (
	"errors"
	"reflect"
	"strings"
)

type Person struct {
	ID   int    `json:"id"`
	Name string `json:"name"`
	Age  int    `json:"age"`
	Sex  int    `json:"sex"`
}

func Map2Struct(m map[string]interface{}, u interface{}, tag string) error {
	valueOf := reflect.ValueOf(u)

	if valueOf.Kind() != reflect.Ptr {
		return errors.New("must ptr")
	}
	valueOf = valueOf.Elem()
	typeOf := valueOf.Type()
	if valueOf.Kind() != reflect.Struct {
		return errors.New("must struct")
	}
	for i := 0; i < valueOf.NumField(); i++ {
		//获取字段类型/获取字段标签
		var fieldName = typeOf.Field(i).Name
		if tag != "" {
			fieldName = strings.Split(typeOf.Field(i).Tag.Get(tag), ",")[0]
		}
		//var fieldName=valueOf.Type().Field(i).Name
		if val, ok := m[fieldName]; ok {
			if val != nil && reflect.ValueOf(val).Kind() == valueOf.Field(i).Kind() {
				valueOf.Field(i).Set(reflect.ValueOf(val))
			}
		}
	}
	return nil
}
func main() {
	// 反射 map to struct
	var per = &interfce_to_struct.Person{}
	var m = map[string]interface{}{
		"name": "xj",
		"Age":  12,
		"Sex":  1,
	}
	_ = map_to_struct.Map2Struct(m, per, "json")
	fmt.Printf("result:%+v\n", per)
	fmt.Println("end.......")
}

切片转结构体

package interface_to_struct

import (
	"errors"
	"reflect"
)

type Person struct {
	ID   int    `json:"id"`
	Name string `json:"name"`
	Age  int    `json:"age"`
	Sex  int    `json:"sex"`
}

func Slice2Struct(arr []interface{}, u interface{}) error {
	valueOf := reflect.ValueOf(u)
	if valueOf.Kind() != reflect.Ptr {
		return errors.New("must ptr")
	}
	valueOf = valueOf.Elem()
	if valueOf.Kind() != reflect.Struct {
		return errors.New("must struct")
	}
	for i := 0; i < valueOf.NumField(); i++ {
		if i >= len(arr) {
			break
		}
		val := arr[i]
		if val != nil && reflect.ValueOf(val).Kind() == valueOf.Field(i).Kind() {
			valueOf.Field(i).Set(reflect.ValueOf(val))
		}
	}
	return nil
}
func main() {
	// 反射 slice to struct
	var per = &interface_to_struct.Person{}
	var arr = []interface{}{1, "xj", 20, 1}
	_ = interface_to_struct.Slice2Struct(arr, per)
	fmt.Printf("result:%+v\n", per)
	fmt.Println("end.......")
}