/ 2019-04-10
反射获取应用
一、反射获取基本类型
package main
import (
"fmt"
"reflect"
)
func main() {
var o string = "oldboy"
// 返回值的类型
t := reflect.TypeOf(o)
fmt.Println("o type:", t)
// 返回具体值的Value
v := reflect.ValueOf(o)
fmt.Println("o value:", v)
}
运行结果:
o type: string
o value: oldboy
二、反射获取结构体
package main
import (
"fmt"
"reflect"
)
type School struct {
Name string
Course string
}
func main() {
o := School{
Name: "oldboy",
Course: "Golang",
}
t := reflect.TypeOf(o)
fmt.Println("o type:", t)
v := reflect.ValueOf(o)
fmt.Println("o value:", v)
}
运行结果:
o type: main.School
o value: {oldboy Golang}
三、反射获取结构体 Tag
1、获取结构体元素单一 Tag
package main
import (
"fmt"
"reflect"
)
type Student struct {
Name string `json:"stu_name"`
Age int `json:"stu_age"`
Course string
}
func getStructTag(i interface{}) {
t := reflect.TypeOf(i)
tag := t.Elem().Field(0).Tag.Get("json")
fmt.Printf("Name Tag:%s\n", tag)
tag = t.Elem().Field(1).Tag.Get("json")
fmt.Printf("Age Tag:%s\n", tag)
}
func main() {
stu := Student{
Name: "oldboy",
Age: 18,
Course: "Golang",
}
getStructTag(&stu)
}
运行结果:
Name Tag:stu_name
Age Tag:stu_age
2、获取结构体元素多个 Tag
package main
import (
"fmt"
"reflect"
)
func main() {
type User struct {
Name string `json:"user_name" xml:"UserName"`
}
u := User{
Name: "oldboy",
}
f := reflect.TypeOf(u).Field(0)
fmt.Println(f.Tag.Get("json"))
fmt.Println(f.Tag.Get("xml"))
}
3、循环获取结构体 Tag
package main
import (
"fmt"
"reflect"
)
func main() {
type User struct {
Name string "user name"
Passwd string `user passsword`
}
u := &User{
Name: "oldboy",
Passwd: "******",
}
s := reflect.TypeOf(u).Elem()
for i := 0; i < s.NumField(); i++ {
fmt.Println(s.Field(i).Tag)
}
}
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