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 }
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