目前大都是使用 validator
安裝
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go get gopkg.in/go-playground/validator.v9 |
原理
當然只能通過反射來實現了，之前寫過一篇反射的文章 golang之反射和斷言 ，里面有寫到怎么通過反射獲取struct tag。
讀取struct tag之后就是對里面的標識符進行識別，然后進行驗證了。具體可以去看源碼。
demo
簡單使用：
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package mainimport ( "fmt" "gopkg.in/go-playground/validator.v9")// User contains user informationtype UserInfo struct { FirstName string `validate:"required"` LastName string `validate:"required"` Age uint8 `validate:"gte=0,lte=100"` Email string `validate:"required,email"`}func main() { validate := validator.New() user := &UserInfo{ FirstName: "Badger", LastName: "Smith", Age: 105, Email: "", } err := validate.Struct(user) if err != nil { for _, err := range err.(validator.ValidationErrors) { fmt.Println(err) } return } fmt.Println("success")} |
輸出：
Key: 'UserInfo.Age' Error:Field validation for 'Age' failed on the 'lte' tag
Key: 'UserInfo.Email' Error:Field validation for 'Email' failed on the 'required' tag
其它類型可以參照文檔 https://godoc.org/gopkg.in/go-playground/validator.v9
幾個例子：
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1.IPtype UserInfo struct { Ip string `validate:"ip"`}2.數字type UserInfo struct { Number float32 `validate:"numeric"`}3.最大值type UserInfo struct { Number float32 `validate:"max=10"`}4.最小值type UserInfo struct { Number float32 `validate:"min=10"`} |
自定義驗證函數
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package mainimport ( "fmt" "gopkg.in/go-playground/validator.v9" "unicode/utf8")// User contains user informationtype UserInfo struct { Name string `validate:"checkName"` Number float32 `validate:"numeric"`}// 自定義驗證函數func checkName(fl validator.FieldLevel) bool { count := utf8.RuneCountInString(fl.Field().String()) fmt.Printf("length: %v \n", count) if count > 5 { return false } return true}func main() { validate := validator.New() //注冊自定義函數，與struct tag關聯起來 err := validate.RegisterValidation("checkName", checkName) user := &UserInfo{ Name: "我是中國人，我愛自己的祖國", Number: 23, } err = validate.Struct(user) if err != nil { for _, err := range err.(validator.ValidationErrors) { fmt.Println(err) } return } fmt.Println("success")} |
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：https://www.tuicool.com/articles/ZZFNNrF
