map -> strcut, struct -> map http://play.golang.org/p/VAaRhf-BHN <参考>http://ideone.com/XWtlo ※これはmap[string][]stringのようにvalueがスライスの場合は動かない。

map-struct.go

package main

import (
	"fmt"
	r "reflect"
)

type S struct {
	I   int
	Str string
}

type error string

func (e error) String() string { return string(e) }

func main() {
	s := S{5, "Bunnies"}
	m, _ := StructToMap(&s)

	s1 := S{}
	MapToStruct(m, &s1)

	fmt.Printf("%+v\n%v\n%+v\n", s, m, s1)
}

func StructToMap(val interface{}) (mapVal map[string]interface{}, ok bool) {

	structVal:= r.Indirect(r.ValueOf(val))
	typ := structVal.Type()

	mapVal = make(map[string]interface{})
	
	for i := 0; i < typ.NumField(); i++ {
		field := structVal.Field(i)
		
		if field.CanSet() {
			mapVal[typ.Field(i).Name] = field.Interface()
		}
	}

	return
}

func MapToStruct(mapVal map[string]interface{}, val interface{}) (ok bool) {
	structVal:= r.Indirect(r.ValueOf(val))
	for name, elem := range mapVal {
		structVal.FieldByName(name).Set(r.ValueOf(elem))
	}

	return
}