例子：
package main
import (
"fmt"
"github.com/chanxuehong/session"
"github.com/chanxuehong/util/random"
)
type Session struct {
Id int64
Name string
// TODO: other fields
}
var sessionStore = session . New ( 60 * 20 , 60 * 60 * 24 )
func main () {
ss := & Session {
Id : 10000 ,
Name : "name" ,
}
sid := string ( random . NewSessionId ())
if err := sessionStore . Add ( sid , ss );
