add sharable package-level hero dependencies with the mvc controllers instances

Former-commit-id: 6c53190e40fa42d242a73eb80361830b65f0d077

_examples/hero/basic/main.go

@@ -21,6 +21,17 @@ func main() {
 	helloServiceHandler := hero.Handler(helloService)
 	app.Get("/service/{to:string}", helloServiceHandler)
 
+	// 3
+	hero.Register(func(ctx iris.Context) (form LoginForm) {
+		// it binds the "form" with a
+		// x-www-form-urlencoded form data and returns it.
+		ctx.ReadForm(&form)
+		return
+	})
+
+	loginHandler := hero.Handler(login)
+	app.Post("/login", loginHandler)
+
 	// http://localhost:8080/your_name
 	// http://localhost:8080/service/your_name
 	app.Run(iris.Addr(":8080"))
@@ -45,3 +56,12 @@ func (s *myTestService) SayHello(to string) string {
 func helloService(to string, service Service) string {
 	return service.SayHello(to)
 }
+
+type LoginForm struct {
+	Username string `form:"username"`
+	Password string `form:"password"`
+}
+
+func login(form LoginForm) string {
+	return "Hello " + form.Username
+}