网站开发

Hello world

helloWorld.go

func main() {
    http.HandleFunc("/hello-world", func(w http.ResponseWriter, r *http.Request) {
        w.Write([]byte("hello world"))

    })
    http.ListenAndServer(":8080", nil)
}

a

create folder api

api/server.go

package api

import (
    "encoding/json"
    "net/http"

    "github.com/google/uuid"
    "github.com/gorilla/mux"
)

type Item struct {
    ID   uuid.UUID `json: "id"`
    Name string    `json:"name"`
}

type Server struct {
    *mux.Router

    shoppingItems []Item
}

func NewServer() *Server {
    s := &Server{
        Router:        mux.NewRouter(),
        shoppingItems: []Item{},
    }
    s.routes()
    return s
}

func (s *Server) routes() {
    s.HandleFunc("/shopping-items", s.listShoppingItems()).Methods("GET")
    s.HandleFunc("/shopping-items", s.createShoppingItem()).Methods("POST")
    s.HandleFunc("/shopping-items/{id}", s.removeShoppingItem()).Methods("Delete")
}

func (s *Server) createShoppingItem() http.HandlerFunc {
    return func(w http.ResponseWriter, r *http.Request) {
        var i Item
        if err := json.NewDecoder(r.Body).Decode(&i); err != nil {
            http.Error(w, err.Error(), http.StatusBadRequest)
            return
        }

        i.ID = uuid.New()
        s.shoppingItems = append(s.shoppingItems, i)

        w.Header().Set("Content-Type", "application/json")
        if err := json.NewEncoder(w).Encode(i); err != nil {
            http.Error(w, err.Error(), http.StatusInternalServerError)
            return
        }
    }
}

func (s *Server) listShoppingItems() http.HandlerFunc {
    return func(w http.ResponseWriter, r *http.Request) {
        w.Header().Set("Content-Type", "application/json")
        if err := json.NewEncoder(w).Encode(s.shoppingItems); err != nil {
            http.Error(w, err.Error(), http.StatusInternalServerError)
            return
        }
    }
}

func (s *Server) removeShoppingItem() http.HandlerFunc {
    return func(w http.ResponseWriter, r *http.Request) {
        idStr, _ := mux.Vars(r)["id"]
        id, err := uuid.Parse(idStr)
        if err != nil {
            http.Error(w, err.Error(), http.StatusBadRequest)
        }

        for i, item := range s.shoppingItems {
            if item.ID == id {
                s.shoppingItems = append(s.shoppingItems[:i], s.shoppingItems[i+1:]...)
                break
            }
        }
    }
}