package main import ( "github.com/gin-gonic/gin" "github.com/gin-gonic/gin/binding" "github.com/go-playground/validator/v10" "net/http" "time" ) type Booking struct { // 包含绑定和验证的数据,bookabledate就是自定义的验证函数 CheckIn time.Time `form:"check_in" binding:"required,bookabledate" time_format:"2006-01-02"` // gtfield=CheckIn只对数字或时间有效,参考官网链接 // https://pkg.go.dev/github.com/go-playground/validator/v10#section-readme CheckOut time.Time `form:"check_out" binding:"required,gtfield=CheckIn,bookabledate" time_format:"2006-01-02"` } // 自定义验证器 var bookableDate validator.Func = func(fl validator.FieldLevel) bool { if date, ok := fl.Field().Interface().(time.Time); ok { today := time.Now() if today.After(date) { // 输入的日期必须大于今天的日期,否则验证失败 return false } } return true } func main() { router := gin.Default() // 注册验证器 validate, ok := binding.Validator.Engine().(*validator.Validate) if ok { validate.RegisterValidation("bookabledate", bookableDate) } router.GET("/bookable", getBookable) router.Run() } func getBookable(context *gin.Context) { var book Booking if err := context.ShouldBindWith(&book, binding.Query); err == nil { context.JSON(200, gin.H{"message": "book date is valid"}) } else { context.JSON(http.StatusBadRequest, gin.H{"err": err.Error()}) } }