目前大都是使用 validator
安裝
go get gopkg.in/go-playground/validator.v9
原理
當(dāng)然只能通過反射來實(shí)現(xiàn)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(duì)里面的標(biāo)識(shí)符進(jìn)行識(shí)別,然后進(jìn)行驗(yàn)證了。具體可以去看源碼。
demo
簡(jiǎn)單使用:
package main
import (
"fmt"
"gopkg.in/go-playground/validator.v9"
)
// User contains user information
type 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(gè)例子:
1.IP
type UserInfo struct {
Ip string `validate:"ip"`
}
2.數(shù)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(yàn)證函數(shù)
package main
import (
"fmt"
"gopkg.in/go-playground/validator.v9"
"unicode/utf8"
)
// User contains user information
type UserInfo struct {
Name string `validate:"checkName"`
Number float32 `validate:"numeric"`
}
// 自定義驗(yàn)證函數(shù)
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(cè)自定義函數(shù),與struct tag關(guān)聯(lián)起來
err := validate.RegisterValidation("checkName", checkName)
user := UserInfo{
Name: "我是中國(guó)人,我愛自己的祖國(guó)",
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?jī)?nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家。
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