这篇文章主要介绍“如何在gin框架中利用结构体来获取参数”,在日常操作中,相信很多人在如何在gin框架中利用结构体来获取参数问题上存在疑惑,小编查阅了各式资料,整理出简单好用的操作方法,希望对大家解答”如何在gin框架中利用结构体来获取参数”的疑惑有所帮助!接下来,请跟着小编一起来学习吧!
我们在写http请求的时候都会遇到后端的Handler是如何来接受请求的参数,我们在请求的时候有表单请求,ajax请求(参数是json),如下:
http://localhost:8080/bind?name=tim&age=1
在gin框架中我们是怎么利用结构体来获取参数呢? 其实很简单我们直接看代码
engine.GET("/bind", handler.BindHandler)
package handler
import (
"fmt"
"github.com/gin-gonic/gin"
)
// 定义结构体
type Member struct {
Name string `form:"name"`
Age int `form:"age"`
}
func BindHandler(c *gin.Context) {
m := &Member{}
c.Bind(m)
fmt.Println(m)
c.JSON(200, gin.H{
"code": "ok",
})
}
就是利用Bind函数将参数和结构体进行绑定
// Bind checks the Content-Type to select a binding engine automatically,
// Depending the "Content-Type" header different bindings are used:
// "application/json" --> JSON binding
// "application/xml" --> XML binding
// otherwise --> returns an error.
// It parses the request's body as JSON if Content-Type == "application/json" using JSON or XML as a JSON input.
// It decodes the json payload into the struct specified as a pointer.
// It writes a 400 error and sets Content-Type header "text/plain" in the response if input is not valid.
func (c *Context) Bind(obj interface{}) error {
b := binding.Default(c.Request.Method, c.ContentType())
return c.MustBindWith(obj, b)
}
Bind的注释可以看出如何绑定和绑定的格式和Content-Type有很大的关系,从源码可以看出有很多类型格式的数据都都可以进行绑定
// BindJSON is a shortcut for c.MustBindWith(obj, binding.JSON).
func (c *Context) BindJSON(obj interface{}) error {
return c.MustBindWith(obj, binding.JSON)
}
// BindXML is a shortcut for c.MustBindWith(obj, binding.BindXML).
func (c *Context) BindXML(obj interface{}) error {
return c.MustBindWith(obj, binding.XML)
}
// BindQuery is a shortcut for c.MustBindWith(obj, binding.Query).
func (c *Context) BindQuery(obj interface{}) error {
return c.MustBindWith(obj, binding.Query)
}
// BindYAML is a shortcut for c.MustBindWith(obj, binding.YAML).
func (c *Context) BindYAML(obj interface{}) error {
return c.MustBindWith(obj, binding.YAML)
}
// BindHeader is a shortcut for c.MustBindWith(obj, binding.Header).
func (c *Context) BindHeader(obj interface{}) error {
return c.MustBindWith(obj, binding.Header)
}
// BindUri binds the passed struct pointer using binding.Uri.
// It will abort the request with HTTP 400 if any error occurs.
func (c *Context) BindUri(obj interface{}) error {
if err := c.ShouldBindUri(obj); err != nil {
c.AbortWithError(http.StatusBadRequest, err).SetType(ErrorTypeBind) // nolint: errcheck
return err
}
return nil
}
到此,关于“如何在gin框架中利用结构体来获取参数”的学习就结束了,希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习,快去试试吧!若想继续学习更多相关知识,请继续关注亿速云网站,小编会继续努力为大家带来更多实用的文章!
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原文链接:https://my.oschina.net/isxiaoge/blog/5037664