Golang表单验证技巧与实现方法

type User struct {
    Name  string `validate:"required,min=2,max=20"`
    Email string `validate:"required,email"`
    Age   int    `validate:"min=1,max=120"`
}

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

import "github.com/go-playground/validator/v10"

var validate *validator.Validate

func init() {
    validate = validator.New()
}

func main() {
    user := User{
        Name:  "",
        Email: "not-an-email",
        Age:   150,
    }

    err := validate.Struct(user)
    if err != nil {
        for _, err := range err.(validator.ValidationErrors) {
            fmt.Printf("Field %s failed validation: %v\n", err.Field(), err.Tag())
        }
    }
}

type LoginRequest struct {
    Email    string `form:"email" binding:"required,email"`
    Password string `form:"password" binding:"required,min=6"`
}

if err := c.ShouldBind(&req); err != nil {
    c.JSON(400, gin.H{"error": err.Error()})
    return
}

validate.RegisterValidation("eqfield", func(fl validator.FieldLevel) bool {
    field := fl.Field().String()
    other := fl.Parent().FieldByName(fl.Param()).String()
    return field == other
})

ConfirmPassword string `validate:"eqfield=Password"`