golan参数校验Validator

go get github.com/go-playground/validator/v10

type UserInfo struct {
 ID    int `validate:"gt=0"`
 Age   int `validate:"gt=0"`
 Name  string `validate:"required"`
 Sex   string `validate:"required"`
}

func InitUserInfo(id,age int,name,sex string) *UserInfo {
 // new一个校验器
 valid := validator.New()
 // 初始化UserInfo
 userInfo := &UserInfo{
  ID: id,
  Age: age,
  Name:name,
  Sex:sex,
 }
 if err := valid.Struct(userInfo);err != nil {
  fmt.Println("参数校验不通过",err)
 }
 return userInfo
}

InitUserInfo(1,2,"kevin","男")// 参数校验通过
InitUserInfo(0,2,"kevin","男")// 参数校验不通过 Key: 'UserInfo.ID' Error:Field validation for 'ID' failed on the 'gt' tag
InitUserInfo(1,2,"kevin","")// 参数校验不通过 Key: 'UserInfo.Sex' Error:Field validation for 'Sex' failed on the 'required' tag

// sum不能大于10
func VerifySum(level validator.FieldLevel) bool {
 if sum,ok := level.Field().Interface().(int);ok{
  fmt.Println(sum)
  if sum > 10 {
   return false
  }
  return true
 }
 return false
}

 // 注册
 if v,ok := binding.Validator.Engine().(*validator.Validate); ok {
  if err := v.RegisterValidation("sum",VerifySum);err != nil{
   fmt.Println("参数校验标签注册失败")
  }
  fmt.Println("参数校验标签注册成功")
 }

type TestSum struct {
 Sum int `binding:"sum"`
}

func getSum(c *gin.Context) {
 var b TestSum
 b.Sum = cast.ToInt(c.Request.URL.Query().Get("sum"))
 // 数据模型绑定查询字符串验证
 if err := c.ShouldBindWith(&b, binding.Query); err == nil {
  c.JSON(http.StatusOK, gin.H{"message": "prams are valid!"})
 } else {
  c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 }
}

func main()  {
 route := gin.Default()
 // 注册
 if v,ok := binding.Validator.Engine().(*validator.Validate); ok {
  if err := v.RegisterValidation("sum",VerifySum);err != nil{
   fmt.Println("参数校验标签注册失败")
  }
  fmt.Println("参数校验标签注册成功")
 }
 route.GET("/getSum", getSum)
 route.Run(":8080")
}

  type TestSum struct {
    Sum int `binding:"sum"`
  }
  // 获取标签值：
 var b TestSum
 b_type := reflect.TypeOf(b)
 fmt.Println(b_type.Field(0).Tag.Get("binding"))