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我们上一篇已经提到了gin中binding时候可以指定json字段大小等限制，但是那个错误却是英文的，现在想搞成中文的，以便前端可读，demo如下

package mainimport ("net/http""reflect""github.com/gin-gonic/gin""github.com/go-playground/validator/v10"
)// binding 指明了json字段的限制，msg是自定义的错误提醒
type UserInfo struct {UserName  string `json:"username" binding:"required,min=4,max=6" msg:"username验证失败"`Age       int    `json:"age" binding:"gt=18,lte=120" msg:"age验证失败"`Password  string `json:"password" binding:"required" msg:"密码校验失败"`Password2 string `json:"password2" binding:"required,eqfield=Password" msg:"必填，切要与password一致"`
}//any是泛型func CoustomError(err error, obj any) map[string]string {var errors map[string]string = make(map[string]string)if err2, ok := err.(validator.ValidationErrors); ok {// 反射getObj := reflect.TypeOf(obj)// 循环错误的验证for _, v := range err2 {if sf, exist := getObj.Elem().FieldByName(v.Field()); exist {// 获取结构体中的msg属性errors[v.Field()] = sf.Tag.Get("msg")}}return errors}return nil
}func validationcustomerror(c *gin.Context) {var user UserInfoerr := c.ShouldBindJSON(&user)if err != nil {errors := CoustomError(err, &user)c.JSON(http.StatusBadRequest, gin.H{"msg": errors})} else {c.JSON(http.StatusOK, gin.H{"msg": user})return}
}func main() {router := gin.Default()router.POST("/validationcustomerror", validationcustomerror)router.Run("localhost:8888")
}