基本使用Go语言没有像Java一样的注解快速进行参数的校验，但可以通过struct tag（结构体标签）进行序列化。常用的如：
type User struct {
ID string `json:"id"`
Name string `json:"name"`
Age string `json:"age"`
}
但需要更复杂的校验，这时需要用一些专业的库来完成。go-playground / validator作为一款优秀的Go语言校验库，基于标记为结构体和单个字段实现值验证。使用简单、快捷。
添加依赖
go get github.com/go-playground/validator
代码
package main
import (
"fmt"
"github.com/go-playground/validator"
)
var validate *validator.Validate //定义
type User struct {
Name string `validate:"required"` //非空
Age uint8 `validate:"gte=0,lte=120"` // 0<=Age<=120
Email string `validate:"required,email"` //非空，email格式
//dive关键字代表 进入到嵌套结构体进行判断
Address []*Address `validate:"dive"` // 可以拥有多个地址
}
type Address struct {
Province string `validate:"required"` //非空
City string `validate:"required"` //非空
Phone string `validate:"numeric,len=11"` //数字类型，长度为11
}
func main() {
validate = validator.New() //初始化（赋值）
validateStruct() //结构体校验
validateVariable() //变量校验
}
func validateStruct() {
address := Address{
Province: "北京",
City: "北京",
Phone: "17694911282x",
}
user := User{
Name: "朝阳",
Age: 23,
Email: "[email protected]",
Address: []*Address{
&address},
}
err := validate.Struct(user)
if err != nil {
//断言为：validator.ValidationErrors，类型为：[]FieldError
for _, e := range err.(validator.ValidationErrors) {
fmt.Println("Namespace:", e.Namespace())
fmt.Println("Field:", e.Field())
fmt.Println("StructNamespace:", e.StructNamespace())
fmt.Println("StructField:", e.StructField())
fmt.Println("Tag:", e.Tag())
fmt.Println("ActualTag:", e.ActualTag())
fmt.Println("Kind:", e.Kind())
fmt.Println("Type:", e.Type())
fmt.Println("Value:", e.Value())
fmt.Println("Param:", e.Param())
fmt.Println()
}
fmt.Println("结构体输入数据类型错误！")
return
} else {
fmt.Println("结构体校验通过")
}
}
//变量校验
func validateVariable() {
myEmail := "[email protected]" //邮箱地址：[email protected]
err := validate.Var(myEmail, "required,email")
if err != nil {
fmt.Println(err)
} else {
fmt.Println("变量校验通过！")
}
}
