func TopicUrl(f1 validator.FieldLevel) bool {return true //返回true表示驗證成功 }func main(){router:=gin.Default()if v, ok := binding.Validator.Engine().(*validator.Validate); ok { //類型斷言v.RegisterValidation("topicurl", TopicUrl) //注冊調用tag和自定義驗證器}v1:=router.Group("/v1/topics"){v1.GET("/:topic_id",GetTopicDetail)} } type Topic struct {TopicID int `form:"id" json:"id"`TopicTitle string `form:"title" json:"title" binding:"min=4,max=20"` //長度4到20之間TopicShortTitle string `form:"stitle" json:"stitle" binding:"required,nefield=ToipcTitle"`//required非空,nfield不能等于TopicTitle字段UserIP string `form:"ip" json:"ip" binding:"ipv4"`TopicScore int `form:"score" json:"score" binding:"omitempty,gt=5"` //omitempty要么不傳，傳的話就要大于5 } type Topic struct {TopicID int `form:"id" json:"id"`TopicTitle string `form:"title" json:"title" binding:"min=4,max=20"`TopicShortTitle string `form:"stitle" json:"stitle" binding:"required,nefield=TopicTitle"`UserIP string `form:"ip" json:"ip" binding:"ipv4"`TopicScore int `form:"score" json:"score" binding:"omitempty,gt=5"`TopicUrl string `form:"url" json:"url" binding:"topicurl"` //綁定自定義的topicurl驗證器 }type Topics struct {TopicList [] *Topic `form:"topiclist" json:"topiclist" binding:"gt=0,lt=3,dive"` //dive表示進入列表或數組里面的字段去驗證，這里是驗證上面的Topic，dive要寫在后面，不然如果lt寫在dive后面就是驗證里面的數據的lt>3，而不是列表的lt>3Size int `form:"size" json:"size"`Age int `form:"age" json:"age" binding:"required,oneof=1 2 3"` //age只能是1 2 3中一個 }

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