fix multipart & add three useful function

c.GetString()
c. GetInt()
c.GetBool()

@@ -35,6 +35,7 @@ var (
 	SessionGCMaxLifetime int64  // session's gc maxlifetime
 	SessionSavePath      string // session savepath if use mysql/redis/file this set to the connectinfo
 	UseFcgi              bool
+	MaxMemory            int64
 
 	GlobalSessions *session.Manager //GlobalSessions
 )
@@ -62,6 +63,7 @@ func init() {
 		SessionGCMaxLifetime = 3600
 		SessionSavePath = ""
 		UseFcgi = false
+		MaxMemory = 1 << 26 //64MB
 	} else {
 		HttpAddr = AppConfig.String("httpaddr")
 		if v, err := AppConfig.Int("httpport"); err != nil {
@@ -69,6 +71,11 @@ func init() {
 		} else {
 			HttpPort = v
 		}
+		if v, err := AppConfig.Int64("maxmemory"); err != nil {
+			MaxMemory = 1 << 26
+		} else {
+			MaxMemory = v
+		}
 		AppName = AppConfig.String("appname")
 		if runmode := AppConfig.String("runmode"); runmode != "" {
 			RunMode = runmode

@@ -170,10 +170,27 @@ func (c *Controller) ServeXml() {
 }
 
 func (c *Controller) Input() url.Values {
-	c.Ctx.Request.ParseForm()
+	ct := c.Ctx.Request.Header.Get("Content-Type")
+	if ct == "multipart/form-data" {
+		c.Ctx.Request.ParseMultipartForm(MaxMemory) //64MB
+	} else {
+		c.Ctx.Request.ParseForm()
+	}
 	return c.Ctx.Request.Form
 }
 
+func (c *Controller) GetString(key string) string {
+	return c.Input().Get(key)
+}
+
+func (c *Controller) GetInt(key string) (int64, error) {
+	return strconv.ParseInt(c.Input().Get(key), 10, 64)
+}
+
+func (c *Controller) GetBool(key string) (bool, error) {
+	return strconv.ParseBool(c.Input().Get(key))
+}
+
 func (c *Controller) StartSession() (sess session.SessionStore) {
 	sess = GlobalSessions.SessionStart(c.Ctx.ResponseWriter, c.Ctx.Request)
 	return