参数模型绑定
最后更新于：2022-04-02 02:47:49
[TOC]
## 继承绑定模型
> [demo](https://github.com/gin-gonic/gin#bind-form-data-request-with-custom-struct)
```
type StructA struct {
FieldA string `form:"field_a"`
}
type StructB struct {
NestedStruct StructA
FieldB string `form:"field_b"`
}
type StructC struct {
NestedStructPointer *StructA
FieldC string `form:"field_c"`
}
type StructD struct {
NestedAnonyStruct struct {
FieldX string `form:"field_x"`
}
FieldD string `form:"field_d"`
}
```
## 模型绑定
```
type User struct {
Username string `form:"username" json:"username" binding:"required"`
Passwd string `form:"passwd" json:"passwd" binding:"required"`
Age int `form:"age" json:"age"`
}
router.POST("/login", func(c *gin.Context) {
var user User
var err error
err := c.Bind(&user)
if err != nil {
log.Fatal(err)
}
c.JSON(http.StatusOK, gin.H{
"user": user.Username,
"passwd": user.Passwd,
"age": user.Age,
})
})
```
### 非自动绑定
Bind，BindJSON，BindXML
```
contentType := c.Request.Header.Get("Content-Type")
switch contentType {
case "application/json":
err = c.BindJSON(&user)
case "application/x-www-form-urlencoded":
err = c.BindWith(&user, binding.Form)
}
```
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