如何使用Golang反射实现JSON序列化 手写简易序列化器案例

v := reflect.ValueOf(obj)
t := v.Type()

for i := 0; i < v.NumField(); i++ {
    fieldVal := v.Field(i)
    fieldTyp := t.Field(i)

    if fieldTyp.PkgPath != "" { // 非导出字段
        continue
    }

    key := fieldTyp.Name
    val := formatValue(fieldVal) // 自定义格式化函数
    jsonMap[key] = val
}

func formatValue(v reflect.Value) interface{} {
    switch v.Kind() {
    case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
        return v.Int()
    case reflect.String:
        return v.String()
    case reflect.Struct:
        return Serialize(v.Interface()) // 递归处理结构体
    case reflect.Slice, reflect.Array:
        items := make([]interface{}, v.Len())
        for i := 0; i < v.Len(); i++ {
            items[i] = formatValue(v.Index(i))
        }
        return items
    case reflect.Ptr:
        if v.IsNil() {
            return nil
        }
        return formatValue(v.Elem())
    default:
        return nil
    }
}

type User struct {
    Name string
    Age  int
    Addr *Address
}

type Address struct {
    City string
    Zip  int
}

func main() {
    user := User{
        Name: "Tom",
        Age:  25,
        Addr: &Address{City: "Beijing", Zip: 100000},
    }

    data := Serialize(user)
    jsonData, _ := json.Marshal(data)
    fmt.Println(string(jsonData))
}

{"Name":"Tom","Age":25,"Addr":{"City":"Beijing","Zip":100000}}