Golang搭建简单JSON API教程

package main
import (
"encoding/json"
"net/http"
)
type User struct {
ID   int    json:"id"
Name string json:"name"
Email string json:"email"
}
func getUser(w http.ResponseWriter, r *http.Request) {
user := User{
ID:    1,
Name:  "Alice",
Email: "alice@example.com",
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(user)
}

func main() {
    http.HandleFunc("/user", getUser)
http.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
    w.WriteHeader(http.StatusOK)
    w.Write([]byte("OK"))
})

println("Server is running on :8080")
http.ListenAndServe(":8080", nil)
}

func createUser(w http.ResponseWriter, r *http.Request) {
    if r.Method != "POST" {
        http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
        return
    }
var user User
err := json.NewDecoder(r.Body).Decode(&user)
if err != nil {
    http.Error(w, "Invalid JSON", http.StatusBadRequest)
    return
}

// 模拟保存成功，返回带ID的结果
user.ID = 100
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusCreated)
json.NewEncoder(w).Encode(user)
}