• main.go # 程序入口
• handler/ # HTTP处理器
• model/ # 数据模型定义
• storage/ # 数据持久化逻辑（内存或文件）

package model
type Todo struct {
ID     int    json:"id"
Title  string json:"title"
Done   bool   json:"done"
}

package storage
import "your-project/model"
var todos = []model.Todo{}
var nextID = 1
func GetAll() []model.Todo {
return todos
}
func Add(todo model.Todo) model.Todo {
todo.ID = nextID
nextID++
todos = append(todos, todo)
return todo
}
func Update(id int, updated model.Todo) bool {
for i, t := range todos {
if t.ID == id {
todos[i] = updated
todos[i].ID = id
return true
}
}
return false
}
func Delete(id int) bool {
for i, t := range todos {
if t.ID == id {
todos = append(todos[:i], todos[i+1:]...)
return true
}
}
return false
}

package handler
import (
"encoding/json"
"net/http"
"strconv"
"your-project/model"
"your-project/storage"
)
func GetTodos(w http.ResponseWriter, r *http.Request) {
todos := storage.GetAll()
json.NewEncoder(w).Encode(todos)
}
func CreateTodo(w http.ResponseWriter, r *http.Request) {
var todo model.Todo
json.NewDecoder(r.Body).Decode(&todo)
saved := storage.Add(todo)
w.WriteHeader(http.StatusCreated)
json.NewEncoder(w).Encode(saved)
}
func UpdateTodo(w http.ResponseWriter, r *http.Request) {
id, _ := strconv.Atoi(r.URL.Path[len("/todos/"):])
var updated model.Todo
json.NewDecoder(r.Body).Decode(&updated)
if !storage.Update(id, updated) {
http.Error(w, "Task not found", http.StatusNotFound)
return
}
json.NewEncoder(w).Encode(updated)
}
func DeleteTodo(w http.ResponseWriter, r *http.Request) {
id, _ := strconv.Atoi(r.URL.Path[len("/todos/"):])
if !storage.Delete(id) {
http.Error(w, "Task not found", http.StatusNotFound)
return
}
w.WriteHeader(http.StatusNoContent)
}

package main
import (
"log"
"net/http"
"your-project/handler"
)
func main() {
http.HandleFunc("GET /todos", handler.GetTodos)
http.HandleFunc("POST /todos", handler.CreateTodo)
http.HandleFunc("PUT /todos/{id}", handler.UpdateTodo)
http.HandleFunc("DELETE /todos/{id}", handler.DeleteTodo)
log.Println("Server starting on :8080")
log.Fatal(http.ListenAndServe(":8080", nil))
}

# 创建任务
curl -X POST localhost:8080/todos \
  -H "Content-Type: application/json" \
  -d '{"title":"Learn Go", "done":false}'
获取所有任务
curl localhost:8080/todos
更新任务
curl -X PUT localhost:8080/todos/1 \
-H "Content-Type: application/json" \
-d '{"title":"Learn Go", "done":true}'
删除任务
curl -X DELETE localhost:8080/todos/1