gin中multipart/urlencoded绑定

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package main   import (     "fmt"     "github.com/gin-gonic/gin"     "net/http" )   type LoginForm struct {     // form："user" 表示前端提交form表单时User对应的key的名称为：user     // binding: "required" required表示前端必须传入该键才可以     User string `form:"user" binding:"required"`     Password string `form:"password" binding:"required"` }   func main() {     router := gin.Default()     router.POST("/login", func(c *gin.Context) {         var form LoginForm         // 你可以使用显示绑定声明绑定 multipart form         //if err := c.ShouldBindWith(&form, binding.Form); err == nil {         // 先校验用户传参是否符合LoginForm的校验约束         // 或者简单的使用ShouldBind方法自动绑定,在这种情况下将自动选择合适的绑定         if err := c.ShouldBind(&form); err == nil {             // 在校验传入的用户名密码是否正确             if form.User == "user" && form.Password == "password" {                 c.JSON(http.StatusOK, gin.H{"status": "you are logged int"})             } else {                 c.JSON(http.StatusUnauthorized, gin.H{"status": "Unauthorized"})             }         } else {             fmt.Println(err)             c.JSON(http.StatusBadRequest, gin.H{"key": "key error"})         }     })     router.Run() }