GoLang的反思错误 – 参数太少

package web

import (
    "net/http"
)

func init() {

}

func (controller *Controller) Index(r *http.Request) (string,int) {
    return "Testing",http.StatusOK
}

使用此处理程序：

type Application struct {
}

func (application *Application) Route(controller interface{},route string) http.HandlerFunc {
    return func(w http.ResponseWriter,r *http.Request) {

        var ptr reflect.Value
        var value reflect.Value
        var finalMethod reflect.Value

        value = reflect.ValueOf(controller)

        // if we start with a pointer,we need to get value pointed to
        // if we start with a value,we need to get a pointer to that value
        if value.Type().Kind() == reflect.Ptr {
            ptr = value
            value = ptr.Elem()
        } else {
            ptr = reflect.New(reflect.TypeOf(controller))
            temp := ptr.Elem()
            temp.Set(value)
        }

        // check for method on value
        method := value.MethodByName(route)
        if method.IsValid() {
            finalMethod = method
        }
        // check for method on pointer
        method = ptr.MethodByName(route)
        if method.IsValid() {
            finalMethod = method
        }

        methodInterface := finalMethod.Call([]reflect.Value{})[0].Interface()
        method_route := methodInterface.(func(r *http.Request) (string,int))
        body,code := method_route(r)
        switch code {
        case http.StatusOK:
            io.WriteString(w,body)
        case http.StatusSeeOther,http.StatusFound:
            http.Redirect(w,r,body,code)
        default:
            w.WriteHeader(code)
            io.WriteString(w,body)
        }
    }
}

它以这种方式执行：

controller := &web.Controller{}
application := &system.Application{}

http.HandleFunc("/",application.Route(controller,"Index"))

问题是编译好了.它没有显示任何错误,但是当我访问网站时,只需指向localhost即可显示：

2014/12/27 22:38:16 http: panic serving 127.0.0.1:58304: reflect: Call with too few input arguments
goroutine 20 [running]:
net/http.func·011()
    /usr/local/Cellar/go/1.3.3/libexec/src/pkg/net/http/server.go:1100 +0xb7

我找不到任何错误,更奇怪的是它编译好了……我是Go的新手,所以我不知道发生了什么……