Shulou(Shulou.com)06/03 Report--

This article mainly introduces "how to use the structure in the gin framework to obtain parameters". In the daily operation, I believe that many people have doubts about how to use the structure to obtain parameters in the gin framework. The editor consulted all kinds of data and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubt of "how to use the structure to obtain parameters in the gin framework". Next, please follow the editor to study!

When we write a http request, we will encounter how the backend Handler accepts the parameters of the request. We have a form request, ajax request (parameter is json), as follows:

Http://localhost:8080/bind?name=tim&age=1

How do we use structures to get parameters in the gin framework? Actually, it's very simple. Let's just look at the code.

Engine.GET ("/ bind", handler.BindHandler) package handlerimport ("fmt"github.com/gin-gonic/gin") / / define the structure 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 Gin.H {"code": "ok",})}

Is to use the Bind function to bind parameters to the structure.

/ / 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)}

The comments of Bind can see how to bind and the format of binding has a lot to do with Content-Type. From the source code, we can see that there are many types of data that can be bound.

/ / 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} this is the end of the study on "how to use structures to obtain parameters in the gin framework". I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.