Golang Type Assertion and reflection

This is a creation in Article, where the information may have evolved or changed.

The session ("user") is set on another page and stores a models. struct of user type
var user models. User

U: = this. GetSession ("user") gets session user, where U is a interface

user = U. (Models. User) Type assertion, I assert that the type of U is models.user type, and then I assign him to another models.user type of variable

Fmt. Println (user. ID) Here I can access the value of the session user

U: = this. GetSession ("user")//Get a interface
V: = reflect. ValueOf (U)//Reflection get the type of this variable
Fmt. Println (V.field (0). Int ())//Fetch the value stored in the No. 0 grid
Fmt. Println (V.elem (). Field (1). String ())//Fetch the value stored in the 1th grid
T: = reflect. TypeOf (U)//Get the type of this variable
Fmt. Println (t)

var acc models. Account
Acc. Username = "Hello"
Val: = reflect. VALUEOF (ACC). Fieldbyname ("Username")//Please take the Username field in the reflection

var acc models. Account
Acc. Username = "Hello"
P: = reflect. ValueOf (&ACC. Username)//Reflection value
V: = P.elem ()//Reflection object P is not addressable, but does not want to set p, (in fact) is *p. To get the contents of P, call the Elem method on the value, point to it indirectly from the pointer, and then save the reflection value as the result of the V
V.setstring ("WORLDV. SetString ("World")//reflection to assign values to an object
Fmt. PRINTLN (ACC)

Func Test (a string) string {return A}func main () {a: = "sssssss" args: = []reflect. Value{reflect. ValueOf (a)}//obtained a []reflect. VALUEC: = reflect. ValueOf (Test). Call (args)//The value of the reflection function and calls FMT. Println (c)}

Get a type of reflection
V: = reflect. ValueOf (user)
Fmt. Println (V.type (). String ())//Get a type of reflection