明智的是，Iris不提供内置数据验证。但是，它允许您附加一个验证器，该验证器将自动调用诸如Context之类的方法。ReadJSON ReadXML… 在这个示例中，我们将学习如何使用go-playground/validator/v10进行请求体验证。

    在这里检查完整的文档和结构标记的用法。

    1. $ go get github.com/go-playground/validator/v10@latest

    注意，您需要在所有想要绑定的字段上设置相应的绑定标记。例如，当从JSON绑定时，设置JSON:“fieldname”。

    1. package main
    3. import (
    4.     "fmt"
    6.     "github.com/kataras/iris/v12"
    8.     "github.com/go-playground/validator/v10"
    9. )
    11. // User contains user information.
    12. type User struct {
    13.     FirstName      string     `json:"fname"`
    14.     LastName       string     `json:"lname"`
    15.     Age            uint8      `json:"age" validate:"gte=0,lte=130"`
    16.     Email          string     `json:"email" validate:"required,email"`
    17.     FavouriteColor string     `json:"favColor" validate:"hexcolor|rgb|rgba"`
    18.     Addresses      []*Address `json:"addresses" validate:"required,dive,required"`
    19. }
    21. // Address houses a users address information.
    22. type Address struct {
    23.     Street string `json:"street" validate:"required"`
    24.     City   string `json:"city" validate:"required"`
    25.     Planet string `json:"planet" validate:"required"`
    26.     Phone  string `json:"phone" validate:"required"`
    27. }
    29. func main() {
    30.     // Use a single instance of Validate, it caches struct info.
    31.     //使用Validate的单个实例，它会缓存结构信息。
    32.     v := validator.New()
    34.     // Register a custom struct validation for 'User'
    35.     // NOTE: only have to register a non-pointer type for 'User', validator
    36.     // internally dereferences during it's type checks.
    37.     //为“User”注册自定义结构验证
    38.     //注意:只需要为'User'， validator注册一个非指针类型
    39.     //在类型检查期间内部解除引用。
    41.     v.RegisterStructValidation(UserStructLevelValidation, User{})
    43.     app := iris.New()
    44.     // Register the validator to the Iris Application.
    45.     app.Validator = v
    47.     app.Post("/user", func(ctx iris.Context) {
    48.         var user User
    50.         // Returns InvalidValidationError for bad validation input,
    51.         // 如果验证输入错误，返回InvalidValidationError，
    52.         // nil or ValidationErrors ( []FieldError )
    55.         err := ctx.ReadJSON(&user)
    56.         if err != nil {
    57.             // This check is only needed when your code could produce
    58.             // an invalid value for validation such as interface with nil
    59.             // value most including myself do not usually have code like this.
    60.             //这个检查只在你的代码可以生成的时候才需要
    61.             //一个无效的验证值，比如nil接口
    62.             //大多数人，包括我自己，通常没有这样的代码。
    64.             if _, ok := err.(*validator.InvalidValidationError); ok {
    65.                 ctx.StatusCode(iris.StatusInternalServerError)
    66.                 ctx.WriteString(err.Error())
    67.                 return
    68.             }
    70.             ctx.StatusCode(iris.StatusBadRequest)
    71.             for _, err := range err.(validator.ValidationErrors) {
    72.                 fmt.Println()
    73.                 fmt.Println(err.Namespace())
    74.                 fmt.Println(err.Field())
    75.                 fmt.Println(err.StructNamespace())
    76.                 fmt.Println(err.StructField())
    77.                 fmt.Println(err.Tag())
    78.                 fmt.Println(err.ActualTag())
    79.                 fmt.Println(err.Kind())
    80.                 fmt.Println(err.Type())
    81.                 fmt.Println(err.Value())
    82.                 fmt.Println(err.Param())
    83.                 fmt.Println()
    84.             }
    86.             return
    87.         }
    89.         // [save user to database...]
    90.     })
    92.     app.Listen(":8080")
    93. }
    95. func UserStructLevelValidation(sl validator.StructLevel) {
    96.     user := sl.Current().Interface().(User)
    98.     if len(user.FirstName) == 0 && len(user.LastName) == 0 {
    99.         sl.ReportError(user.FirstName, "FirstName", "fname", "fnameorlname", "")
    100.         sl.ReportError(user.LastName, "LastName", "lname", "fnameorlname", "")
    101.     }
    102. }

    JSON形式的请求示例:

    1. {
    2.     "fname": "",
    3.     "lname": "",
    4.     "age": 45,
    5.     "email": "mail@example.com",
    6.     "favColor": "#000",
    7.     "addresses": [{
    8.         "street": "Eavesdown Docks",
    9.         "planet": "Persphone",
    10.         "phone": "none",
    11.         "city": "Unknown"
    12.     }]
    13. }

    示例可以在以下地址找到: https://github.com/kataras/iris/tree/master/_examples/request-body/read-json-struct-validation/main.go。