모든것에 오예스!!

mkdir go-rest-api
cd go-rest-api
go mod init example.com/go-rest-api

package main

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

type User struct {
    ID    int    `json:"id"`
    Name  string `json:"name"`
    Email string `json:"email"`
}

var users = []User{
    {ID: 1, Name: "Heejune", Email: "hee@example.com"},
    {ID: 2, Name: "Jihyun", Email: "jihyun@example.com"},
}

func main() {
    http.HandleFunc("/users", getUsersHandler)

    log.Println("✅ Server started on port 8080")
    log.Fatal(http.ListenAndServe(":8080", nil))
}

func getUsersHandler(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-Type", "application/json")
    json.NewEncoder(w).Encode(users)
}

go run main.go

[
  { "id": 1, "name": "Heejune", "email": "hee@example.com" },
  { "id": 2, "name": "Jihyun", "email": "jihyun@example.com" }
]

func createUserHandler(w http.ResponseWriter, r *http.Request) {
    if r.Method != http.MethodPost {
        http.Error(w, "Invalid request method", http.StatusMethodNotAllowed)
        return
    }

    var newUser User
    if err := json.NewDecoder(r.Body).Decode(&newUser); err != nil {
        http.Error(w, err.Error(), http.StatusBadRequest)
        return
    }

    newUser.ID = len(users) + 1
    users = append(users, newUser)

    w.Header().Set("Content-Type", "application/json")
    w.WriteHeader(http.StatusCreated)
    json.NewEncoder(w).Encode(newUser)
}

func main() {
    http.HandleFunc("/users", func(w http.ResponseWriter, r *http.Request) {
        switch r.Method {
        case http.MethodGet:
            getUsersHandler(w, r)
        case http.MethodPost:
            createUserHandler(w, r)
        default:
            http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
        }
    })

    log.Println("✅ Server started on port 8080")
    log.Fatal(http.ListenAndServe(":8080", nil))
}

{
  "name": "Siyu",
  "email": "siyu@example.com"
}

go-rest-api/
├── main.go
├── handler/
│   └── user_handler.go
├── model/
│   └── user.go
├── service/
│   └── user_service.go

package model

type User struct {
    ID    int    `json:"id"`
    Name  string `json:"name"`
    Email string `json:"email"`
}

package service

import "example.com/go-rest-api/model"

var users = []model.User{
    {ID: 1, Name: "Heejune", Email: "hee@example.com"},
    {ID: 2, Name: "Jihyun", Email: "jihyun@example.com"},
}

func GetAllUsers() []model.User {
    return users
}

func AddUser(u model.User) model.User {
    u.ID = len(users) + 1
    users = append(users, u)
    return u
}

package handler

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

    "example.com/go-rest-api/model"
    "example.com/go-rest-api/service"
)

func GetUsersHandler(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-Type", "application/json")
    json.NewEncoder(w).Encode(service.GetAllUsers())
}

func CreateUserHandler(w http.ResponseWriter, r *http.Request) {
    if r.Method != http.MethodPost {
        http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
        return
    }

    var user model.User
    if err := json.NewDecoder(r.Body).Decode(&user); err != nil {
        http.Error(w, err.Error(), http.StatusBadRequest)
        return
    }

    created := service.AddUser(user)
    w.Header().Set("Content-Type", "application/json")
    w.WriteHeader(http.StatusCreated)
    json.NewEncoder(w).Encode(created)
}

package main

import (
    "log"
    "net/http"

    "example.com/go-rest-api/handler"
)

func main() {
    http.HandleFunc("/users", func(w http.ResponseWriter, r *http.Request) {
        switch r.Method {
        case http.MethodGet:
            handler.GetUsersHandler(w, r)
        case http.MethodPost:
            handler.CreateUserHandler(w, r)
        default:
            http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
        }
    })

    log.Println("🚀 Go REST API Server started on port 8080")
    log.Fatal(http.ListenAndServe(":8080", nil))
}

go run main.go

curl http://localhost:8080/users

curl -X POST -H "Content-Type: application/json" \
-d '{"name":"Chihyun","email":"chi@example.com"}' \
http://localhost:8080/users