AImager

package main

import (
    "encoding/json"
    "fmt"
    "reflect"
)

func main() {
    type User struct {
        UserId   int    `json:"user_id" bson:"user_id"`
        UserName string `json:"user_name" bson:"user_name"`
    }

    // 输出json格式
    u := User{UserId: 1, UserName: "tony"}
    fmt.Println(u.UserId)
    j, _ := json.Marshal(&u)
    fmt.Println(string(j)) // 输出内容：{"user_id":1,"user_name":"tony"}

    // 获取tag中的内容
    t := reflect.TypeOf(u)
    field := t.Elem().Field(0)
    fmt.Println(field.Tag.Get("json"))
}