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HttpRouter是一個輕量級但卻非常高效的multiplexer。

手冊：

https://godoc.org/github.com/julienschmidt/httprouter https://github.com/julienschmidt/httprouter

安裝httprouter

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go get github.com/julienschmidt/httprouter

用法示例

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代碼如下：

?main.go 文件

package mainimport ("github.com/julienschmidt/httprouter""net/http"//"log" )func RegisterHandlers() *httprouter.Router {//New()方法創建了實例，啟動web服務router := httprouter.New()//注冊handlerrouter.GET("/", Index)router.GET("/hello/:name", Hello)//注冊handlerrouter.POST("/user", CreateUser)router.POST("/user/:user_name", Login)return router }func main() {registerHandler := RegisterHandlers()//log.Fatal(http.ListenAndServe(":8080", router))http.ListenAndServe(":8080", router) }

這種模式"/hello/:name"，它可以用來做命名匹配，類似于正則表達式的命名捕獲分組。

?Handlers.go 文件

定義httprouter中的handler，處理對應請求

package mainimport ("github.com/julienschmidt/httprouter""net/http""io" )func Index(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {fmt.Fprint(w, "Welcome!\n") }func Hello(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {fmt.Fprintf(w, "hello, %s!\n", ps.ByName("name")) }func CreateUser(w http.ResponseWriter, r *http.Request, p httprouter.Params) {io.WriteString(w, "create User Handler") }func Login(w http.ResponseWriter, r *http.Request, p httprouter.Params) {userName := p.ByName("user_name")io.WriteString(w, userName) }

測試

瀏覽器上輸入路由即可

如：

http://localhost:8080/hello/xxxx

瀏覽器上輸出：hello, xxxx!

httprouter用法說明

Variables func CleanPath(p string) string type Handle type Param type Paramsfunc ParamsFromContext(ctx context.Context) Paramsfunc (ps Params) ByName(name string) string type Routerfunc New() *Routerfunc (r *Router) DELETE(path string, handle Handle)func (r *Router) GET(path string, handle Handle)func (r *Router) HEAD(path string, handle Handle)func (r *Router) Handle(method, path string, handle Handle)func (r *Router) Handler(method, path string, handler http.Handler)func (r *Router) HandlerFunc(method, path string, handler http.HandlerFunc)func (r *Router) Lookup(method, path string) (Handle, Params, bool)func (r *Router) OPTIONS(path string, handle Handle)func (r *Router) PATCH(path string, handle Handle)func (r *Router) POST(path string, handle Handle)func (r *Router) PUT(path string, handle Handle)func (r *Router) ServeFiles(path string, root http.FileSystem)func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request) type Handle

httprouter中的Handle類似于http.HandlerFunc，只不過它支持第三個參數Params。

type Handle func(http.ResponseWriter, *http.Request, Params)Handle is a function that can be registered to a route to handle HTTPrequests. Like http.HandlerFunc, but has a third parameter for the values ofwildcards (variables).

例如前面示例中的Index()和Hello()都是Handle類型的實例。

func Index(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {fmt.Fprint(w, "Welcome!\n") }func Hello(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {fmt.Fprintf(w, "hello, %s!\n", ps.ByName("name")) }

注冊handler httprouter.Router類型類似于http包中的ServeMux，它實現了http.Handler接口，所以它是一個http.Handler。它可以將請求分配給注冊好的handler。

type Router struct {} func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request)

除此之外，Router提供了不少方法，用來指示如何為路徑注冊handler。

func (r *Router) Handle(method, path string, handle Handle) func (r *Router) Handler(method, path string, handler http.Handler) func (r *Router) HandlerFunc(method, path string, handler http.HandlerFunc)

httprouter.Handle()用于為路徑注冊指定的Handle，而httprouter.Handle對應于http.HandlerFunc，所以是直接將Handle類型的函數綁定到指定路徑上。同時，它還可以指定http方法：GET, POST, HEAD, PUT, PATCH, DELETE, OPTIONS。

轉載于:https://my.oschina.net/u/3683692/blog/3038920

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