Golang表单多字段验证与数据绑定项目

go get -u github.com/gin-gonic/gin
go get -u github.com/go-playground/validator/v10

type RegisterForm struct {
    Username string `form:"username" binding:"required,min=3,max=20"`
    Email    string `form:"email" binding:"required,email"`
    Password string `form:"password" binding:"required,min=6"`
    Age      int    `form:"age" binding:"gte=0,lte=120"`
}

func main() {
    r := gin.Default()
    r.LoadHTMLFiles("templates/register.html")

    r.GET("/register", func(c *gin.Context) {
        c.HTML(200, "register.html", nil)
    })

    r.POST("/register", func(c *gin.Context) {
        var form RegisterForm
        if err := c.ShouldBind(&form); err != nil {
            c.JSON(400, gin.H{"error": err.Error()})
            return
        }

        // 验证通过，处理业务逻辑
        c.JSON(200, gin.H{
            "message": "注册成功",
            "data":    form,
        })
    })

    r.Run(":8080")
}

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

var validate *validator.Validate

func init() {
    validate = validator.New()
    validate.RegisterValidation("unique_username", uniqueUsername)
}

func uniqueUsername(fl validator.FieldLevel) bool {
    username := fl.Field().String()
    // 模拟数据库查询
    return username != "admin" // 假设admin已被占用
}

type RegisterForm struct {
    Username string `form:"username" binding:"required,min=3,unique_username"`
    // 其他字段...
}