GoLang struct的tag

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 mainimport (    "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"))

 }