Golang实现Todo列表开发教程

• 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
<p>type Todo struct {
ID     int    <code>json:"id"</code>
Title  string <code>json:"title"</code>
Done   bool   <code>json:"done"</code>
}</p>

package storage
<p>import "your-project/model"</p><p>var todos = []model.Todo{}
var nextID = 1</p><p>func GetAll() []model.Todo {
return todos
}</p><p>func Add(todo model.Todo) model.Todo {
todo.ID = nextID
nextID++
todos = append(todos, todo)
return todo
}</p><p>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
}</p><p>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
}</p>

package handler
<p>import (
"encoding/json"
"net/http"
"strconv"</p><pre class="brush:php;toolbar:false;">"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
<p>import (
"log"
"net/http"
"your-project/handler"
)</p><p>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)</p><pre class="brush:php;toolbar:false;">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}'
<h1>获取所有任务</h1><p>curl localhost:8080/todos</p><h1>更新任务</h1><p>curl -X PUT localhost:8080/todos/1 \
-H "Content-Type: application/json" \
-d '{"title":"Learn Go", "done":true}'</p><h1>删除任务</h1><p>curl -X DELETE localhost:8080/todos/1</p>