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package main
import (
"fmt"
"reflect"
)
type User struct {
Id int
Name string
Age int
}
func (u User) Hello() {
fmt.Println("Hello World")
}
//空接口,可以传入任何信息
func Info(o interface{}) {
t := reflect.TypeOf(o)
fmt.Println("Type:", t.Name())
if k := t.Kind(); k != reflect.Struct {
fmt.Println("XX")
return
}
v := reflect.ValueOf(o)
fmt.Println("Fields:")
for i := 0; i < t.NumField(); i++ {
f := t.Field(i)
val := v.Field(i).Interface()
fmt.Printf("%6s: %v = %v", f.Name, f.Type, val)
}
fmt.Println()
for i := 0; i < t.NumMethod(); i++ {
m := t.Method(i)
fmt.Printf("%6s: %v n", m.Name, m.Type)
}
}
func main() {
u := User{1, "OK", 12}
//u 是值拷贝方式传递
Info(u)
}
package main
import (
"fmt"
"reflect"
)
type User struct {
Id int
Name string
Age int
}
type Manager struct{
User //匿名字段
title string
}
func main() {
m:= Manager{User:User{1,"OK",12},title:"123"}
//取出 Manager 的类型
t:=reflect.TypeOf(m)
fmt.Printf("%#vn",t.Field(1))
fmt.Printf("%#vn",t.FieldByIndex([]int{0,0}))
}
输出信息
reflect.StructField{Name:"title", PkgPath:"main", Type:(*reflect.rtype)(0x4a89c0), Tag:"", Offset:0x20, Index:[]int{1}, Anonymous:false}
reflect.StructField{Name:"Id", PkgPath:"", Type:(*reflect.rtype)(0x4a8380), Tag:"", Offset:0x0, Index:[]int{0}, Anonymous:false}
Process finished with exit code 0
package main
import (
"fmt"
"reflect"
)
// 通过反射修改数据
func main() {
x:= 123
v:=reflect.ValueOf(&x)
v.Elem().SetInt(999)
fmt.Println(x)
}
package main
import (
"reflect"
"fmt"
)
type User struct {
Id int
Name string
Age int
}
// 通过反射修改数据
func main() {
u := User{1, "Ok", 12}
Set(&u)
fmt.Println(u)
}
func Set(o interface{}) {
v := reflect.ValueOf(o)
if v.Kind() == reflect.Ptr && !v.Elem().CanSet() {
fmt.Println("XXX")
return
} else {
v = v.Elem()
}
f := v.FieldByName("Name")
if !f.IsValid() {
fmt.Println("SSS")
return
}
if f.Kind() == reflect.String {
f.SetString("Bye")
}
}
package main
import (
"reflect"
"fmt"
)
type User struct {
Id int
Name string
Age int
}
func (u User)Hello(name string){
fmt.Println("Hello",name,",my name is",u.Name)
}
// 通过反射调用函数
func main() {
u := User{1, "Ok", 12}
v:=reflect.ValueOf(u)
mv:=v.MethodByName("Hello")
args:=[]reflect.Value{reflect.ValueOf("mark")}
mv.Call(args)
}
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