GoLang struct的tag

Posted 2020-10-08 努力奋斗的小墨鱼专栏

GoLang获取struct的tag内容,  这是tag，可以被reflect API访问；beego的ORM中也通过tag来定义参数的。

获取tag的内容是利用反射包来实现的。示例代码能清楚的看懂！

 

package main

import (
   "fmt"
   "reflect"
)

type Job struct {
   AlarmStatus      *string        `json:"alarm_status" name:"alarm_status"`
   CPUTopology      string        `json:"cpu_topology" name:"cpu_topology"`
}


func main(){
   a := "abc"
   s := Job{&a,"hello"}
   st := reflect.TypeOf(s)
   field := st.Field(1)
   fmt.Println(field.Tag.Get("json"), field.Tag.Get("name"))
}

 

 

package main
import (
    "fmt"
    "reflect" // 这里引入reflect模块
)

type User struct {
    Name   string "user name" //这引号里面的就是tag
    Passwd string "user passsword"
}

func main() {
    user := &User{"chronos", "pass"}
    s := reflect.TypeOf(user).Elem() //通过反射获取type定义
    for i := 0; i < s.NumField(); i++ {
        fmt.Println(s.Field(i).Tag) //将tag输出出来
    }
}

 

package main

import (
    "fmt"
    "reflect"
)

func main() {
    type S struct {
         F string `species:"gopher" color:"blue"`
     }

     s := S{}
     st := reflect.TypeOf(s)
     field := st.Field(0)
     fmt.Println(field.Tag.Get("color"), field.Tag.Get("species"))

 }