Golang实现小型任务提醒工具实例

答案:使用Go语言实现一个命令行任务提醒工具,通过Task结构体定义任务属性,JSON文件持久化存储,time.AfterFunc实现定时提醒,程序启动时加载任务并调度,支持添加、查看、完成和删除任务。

golang实现小型任务提醒工具实例

写一个小型任务提醒工具,用Golang实现,其实并不复杂,核心在于任务的定义、存储以及一个简单的调度机制。你可以把它想象成一个命令行下的迷你版日程助理,帮你记住那些不容错过的小事。

解决方案

要实现这样一个工具,我们可以从几个关键点入手:首先是任务的数据结构,它决定了我们能记录哪些信息;接着是任务的存储,确保数据不会随着程序关闭而丢失;最后,也是最关键的,是任务的调度和提醒,让程序能在正确的时间“叫醒”你。

我的思路是,用一个Go结构体来定义任务,包含ID、标题、描述、提醒时间以及完成状态。为了简化,存储部分可以考虑使用JSON文件,读写方便,对小型数据量非常友好。至于提醒,Go的

time.AfterFunc

配合goroutine就能优雅地实现单次提醒,而如果需要更复杂的周期性提醒,可以考虑引入像

robfig/cron

这样的库,不过对于“小型”工具,我们先聚焦在基础功能上。

程序启动时,会从文件加载所有未完成的任务,然后为每个任务设置一个

time.AfterFunc

,当时间到达时,就打印提醒信息。用户可以通过命令行指令添加、查看、完成任务。这样,一个基本的任务提醒工具就有了雏形。

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如何设计一个简洁高效的任务数据结构?

设计任务的数据结构,就像在给你的“备忘录”定规矩,得想清楚它需要记录什么。对我来说,一个任务至少得有几个基本属性:一个独一无二的标识符,方便操作;一个标题,一眼就知道是啥事;一个详细描述,记录更多上下文;当然,最重要的是提醒时间,这是提醒工具的灵魂;最后,一个状态,比如“已完成”或“待办”,管理起来才清晰。

我们可以在Golang中这样定义它:

package mainimport (    "fmt"    "time")// Task 定义了任务的数据结构type Task struct {    ID          string    `json:"id"`           // 任务唯一标识符    Title       string    `json:"title"`        // 任务标题    Description string    `json:"description"`  // 任务详细描述    DueTime     time.Time `json:"due_time"`     // 提醒时间    IsCompleted bool      `json:"is_completed"` // 任务是否已完成}// String 方法让Task在打印时更具可读性func (t Task) String() string {    status := "待办"    if t.IsCompleted {        status = "已完成"    }    return fmt.Sprintf("ID: %sn标题: %sn描述: %sn提醒时间: %sn状态: %sn",        t.ID, t.Title, t.Description, t.DueTime.Format("2006-01-02 15:04:05"), status)}

这里我用了

json:"..."

的tag,这在后续进行JSON序列化和反序列化时非常有用,能让字段名在JSON中更规范。

DueTime

使用

time.Time

类型是关键,它提供了强大的时间处理能力,比如格式化、比较等。

String()

方法则是一个小小的便利,让

fmt.Println(task)

时输出更友好,而不是一堆内存地址。ID用

string

类型,可以考虑使用

uuid

库生成,确保唯一性。

Golang中如何实现任务的持久化存储?

任务的持久化存储,对于一个提醒工具来说是必不可少的。总不能每次程序重启,任务就全没了,对吧?对于小型应用,我通常会选择JSON文件作为存储介质,它简单、直观,并且Go标准库提供了非常完善的

encoding/json

包来处理。

核心思路是:将内存中的

[]Task

切片编码成JSON格式的字符串,然后写入文件;反过来,从文件读取JSON字符串,解码成

[]Task

切片。

package mainimport (    "encoding/json"    "io/ioutil"    "os"    "path/filepath")const dataFile = "tasks.json"// saveTasks 将任务列表保存到JSON文件func saveTasks(tasks []Task) error {    data, err := json.MarshalIndent(tasks, "", "  ") // 使用MarshalIndent让JSON文件更易读    if err != nil {        return fmt.Errorf("序列化任务失败: %w", err)    }    // 确保数据文件所在的目录存在    dir := filepath.Dir(dataFile)    if dir != "" && dir != "." { // 如果dataFile不是在当前目录,需要创建目录        if _, err := os.Stat(dir); os.IsNotExist(err) {            if err := os.MkdirAll(dir, 0755); err != nil {                return fmt.Errorf("创建数据目录失败: %w", err)            }        }    }    err = ioutil.WriteFile(dataFile, data, 0644)    if err != nil {        return fmt.Errorf("写入任务文件失败: %w", err)    }    return nil}// loadTasks 从JSON文件加载任务列表func loadTasks() ([]Task, error) {    if _, err := os.Stat(dataFile); os.IsNotExist(err) {        // 文件不存在,返回空列表而不是错误        return []Task{}, nil    }    data, err := ioutil.ReadFile(dataFile)    if err != nil {        return nil, fmt.Errorf("读取任务文件失败: %w", err)    }    var tasks []Task    err = json.Unmarshal(data, &tasks)    if err != nil {        return nil, fmt.Errorf("反序列化任务失败: %w", err)    }    return tasks, nil}

这里我用了

json.MarshalIndent

而不是

json.Marshal

,只是为了让输出的JSON文件带缩进,更方便人类阅读和调试。

ioutil.WriteFile

ioutil.ReadFile

是读写文件的便捷函数。在

loadTasks

时,特意检查了文件是否存在,如果不存在就返回一个空的任务列表,这样程序启动时就不会因为文件不存在而报错,用户体验会更好。

如何构建一个可靠的任务调度和提醒机制?

任务调度和提醒是这个工具的核心功能,也是最需要一点“魔法”的地方。在Golang里,实现一个简单的调度机制,其实比想象中要直接。我们主要利用

time.AfterFunc

这个函数,它可以在指定延迟后执行一个函数,非常适合单次提醒的场景。

关键在于,程序启动后,我们需要遍历所有未完成的任务,为每个任务计算出距离提醒时间还有多久,然后设置一个

time.AfterFunc

。由于

time.AfterFunc

是非阻塞的(它会在一个新的goroutine中执行你的函数),所以可以同时调度多个任务。

package mainimport (    "sync"    "time")// scheduler 用于管理所有任务的调度type Scheduler struct {    tasks      []Task    mu         sync.Mutex // 保护tasks切片的并发访问    stopChans  map[string]chan struct{} // 存储每个任务的停止信号通道}func NewScheduler(initialTasks []Task) *Scheduler {    s := &Scheduler{        tasks:      initialTasks,        stopChans:  make(map[string]chan struct{}),    }    return s}// ScheduleTask 为单个任务设置提醒func (s *Scheduler) ScheduleTask(task Task) {    if task.IsCompleted {        return // 已完成的任务无需调度    }    now := time.Now()    if task.DueTime.Before(now) {        // 提醒时间已过,可以直接触发提醒或标记为过期        fmt.Printf("【过期提醒】任务 '%s' (ID: %s) 提醒时间已过: %sn", task.Title, task.ID, task.DueTime.Format("15:04:05"))        return    }    duration := task.DueTime.Sub(now)    if duration <= 0 { // 避免负数或零导致time.AfterFunc立即执行        duration = time.Millisecond // 至少等待一毫秒    }    stopChan := make(chan struct{})    s.mu.Lock()    s.stopChans[task.ID] = stopChan // 记录停止通道,以便取消    s.mu.Unlock()    fmt.Printf("【调度】任务 '%s' (ID: %s) 将在 %s 后提醒。n", task.Title, task.ID, duration.String())    go func(t Task, sc chan struct{}) {        select {        case <-time.After(duration):            fmt.Printf("n? 【任务提醒】时间到了!n%sn", t.String())            // 提醒后,可以考虑自动标记为已完成或需要用户手动确认            // 这里为了简化,我们只打印提醒        case <-sc:            fmt.Printf("【取消调度】任务 '%s' (ID: %s) 的提醒已被取消。n", t.Title, t.ID)        }        s.mu.Lock()        delete(s.stopChans, t.ID) // 任务完成后从调度器中移除        s.mu.Unlock()    }(task, stopChan)}// CancelTask 取消一个任务的提醒func (s *Scheduler) CancelTask(taskID string) {    s.mu.Lock()    defer s.mu.Unlock()    if ch, ok := s.stopChans[taskID]; ok {        close(ch) // 发送停止信号        delete(s.stopChans, taskID)    }}// StartAllTasksScheduler 启动所有任务的调度func (s *Scheduler) StartAllTasksScheduler() {    s.mu.Lock()    defer s.mu.Unlock()    for _, task := range s.tasks {        s.ScheduleTask(task)    }}// AddTaskToScheduler 添加新任务并调度func (s *Scheduler) AddTaskToScheduler(task Task) {    s.mu.Lock()    s.tasks = append(s.tasks, task)    s.mu.Unlock()    s.ScheduleTask(task)}

这里我引入了一个

Scheduler

结构体来管理所有任务的调度,包括一个

sync.Mutex

来保证并发安全,以及一个

stopChans

映射来存储每个任务的停止信号通道,这在需要取消某个任务的提醒时非常有用。

select

语句结合

time.After

stopChan

,可以优雅地实现定时提醒或提前取消提醒。

需要注意的是,

time.AfterFunc

创建的定时器,如果程序退出,这些定时器也会随之消失。所以,一个真正“可靠”的提醒工具,在生产环境中,可能需要一个长期运行的后台进程,或者结合操作系统的计划任务(如Linux的cronjob,Windows的任务计划程序)来确保即使程序意外退出,也能在下次启动时重新加载并调度任务。但对于我们这个小型工具,当前这种内存调度方案已经足够演示核心概念了。

命令行交互与任务管理

一个没有用户界面的工具是孤独的。虽然是命令行,但我们仍然需要一些指令来与它互动,比如添加任务、查看任务列表、标记任务完成,或者干脆删除一个任务。这部分,通常会用到Go的

flag

包或者更高级的命令行解析库如

spf13/cobra

我们可以设计几个简单的命令:

go run main.go add -t "买菜" -d "晚上做饭用" -time "2023-10-27 18:00:00"

:添加一个新任务。

go run main.go list

:列出所有任务。

go run main.go complete -id 

:标记任务完成。

go run main.go delete -id 

:删除任务。

这需要我们在

main

函数中解析命令行参数,并根据参数执行相应的逻辑。例如,

main

函数可能长这样:

package mainimport (    "bufio"    "fmt"    "os"    "strings"    "time"    "github.com/google/uuid" // 引入uuid库生成唯一ID)var scheduler *Schedulervar tasks []Task // 全局的任务列表func main() {    // 加载现有任务    loadedTasks, err := loadTasks()    if err != nil {        fmt.Printf("加载任务失败: %vn", err)        os.Exit(1)    }    tasks = loadedTasks    scheduler = NewScheduler(tasks)    scheduler.StartAllTasksScheduler() // 启动所有任务的调度    fmt.Println("任务提醒工具已启动。输入 'help' 查看命令。")    reader := bufio.NewReader(os.Stdin)    for {        fmt.Print("> ")        input, _ := reader.ReadString('n')        input = strings.TrimSpace(input)        parts := strings.Fields(input)        if len(parts) == 0 {            continue        }        command := parts[0]        args := parts[1:]        switch command {        case "add":            handleAddCommand(args)        case "list":            handleListCommand()        case "complete":            handleCompleteCommand(args)        case "delete":            handleDeleteCommand(args)        case "help":            printHelp()        case "exit":            fmt.Println("退出任务提醒工具。")            // 在退出前保存所有任务            if err := saveTasks(tasks); err != nil {                fmt.Printf("保存任务失败: %vn", err)            }            return        default:            fmt.Println("未知命令。输入 'help' 查看命令。")        }    }}func printHelp() {    fmt.Println(`可用命令:  add     - 添加新任务 (due_time格式: "2006-01-02 15:04:05")  list                                  - 列出所有任务  complete                     - 标记任务为已完成  delete                       - 删除任务  help                                  - 显示帮助信息  exit                                  - 退出程序`)}func handleAddCommand(args []string) {    if len(args) < 3 {        fmt.Println("用法: add <title>  ")        return    }    title := args[0]    description := args[1]    dueTimeStr := strings.Join(args[2:], " ") // due_time可能包含空格    dueTime, err := time.Parse("2006-01-02 15:04:05", dueTimeStr)    if err != nil {        fmt.Printf("时间格式错误,请使用 'YYYY-MM-DD HH:MM:SS' 格式: %vn", err)        return    }    newTask := Task{        ID:          uuid.New().String(),        Title:       title,        Description: description,        DueTime:     dueTime,        IsCompleted: false,    }    tasks = append(tasks, newTask)    scheduler.AddTaskToScheduler(newTask) // 添加到调度器    if err := saveTasks(tasks); err != nil {        fmt.Printf("保存任务失败: %vn", err)    }    fmt.Printf("任务 '%s' 已添加,ID: %sn", newTask.Title, newTask.ID)}func handleListCommand() {    if len(tasks) == 0 {        fmt.Println("当前没有任务。")        return    }    fmt.Println("--- 任务列表 ---")    for _, task := range tasks {        fmt.Println(task.String())    }    fmt.Println("----------------")}func handleCompleteCommand(args []string) {    if len(args) < 1 {        fmt.Println("用法: complete ")        return    }    taskID := args[0]    found := false    for i := range tasks {        if tasks[i].ID == taskID {            tasks[i].IsCompleted = true            scheduler.CancelTask(taskID) // 任务完成,取消调度            found = true            break        }    }    if found {        if err := saveTasks(tasks); err != nil {            fmt.Printf("保存任务失败: %vn", err)        }        fmt.Printf("任务 '%s' 已标记为完成。n", taskID)    } else {        fmt.Printf("未找到ID为 '%s' 的任务。n", taskID)    }}func handleDeleteCommand(args []string) {    if len(args) < 1 {        fmt.Println("用法: delete ")        return    }    taskID := args[0]    newTasks := []Task{}    found := false    for _, task := range tasks {        if task.ID == taskID {            found = true            scheduler.CancelTask(taskID) // 删除任务,取消调度        } else {            newTasks = append(newTasks, task)        }    }    if found {        tasks = newTasks        if err := saveTasks(tasks); err != nil {            fmt.Printf("保存任务失败: %vn", err)        }        fmt.Printf("任务 '%s' 已删除。n", taskID)    } else {        fmt.Printf("未找到ID为 '%s' 的任务。n", taskID)    }}</pre>
<div class="contentsignin"></div>
</div>
<p>我这里直接用了一个简单的</p>
<div class="code" style="position:relative;padding:0px;margin:0px">
<pre class="brush:php;toolbar:false;">bufio.NewReader(os.Stdin)</pre>
<div class="contentsignin"></div>
</div>
<p>来读取用户输入,并通过</p>
<div class="code" style="position:relative;padding:0px;margin:0px">
<pre class="brush:php;toolbar:false;">strings.Fields</pre>
<div class="contentsignin"></div>
</div>
<p>来分割命令和参数。这种方式虽然不如</p>
<div class="code" style="position:relative;padding:0px;margin:0px">
<pre class="brush:php;toolbar:false;">cobra</pre>
<div class="contentsignin"></div>
</div>
<p>等库强大,但对于一个“小型”且注重示例的工具来说,足够了。它能让你清晰地看到命令解析和逻辑执行的整个流程,并且在退出时,别忘了保存任务,这是持久化的最后一步。</p>
<p>以上就是Golang实现小型任务提醒工具实例的详细内容,更多请关注创想鸟其它相关文章!</p>
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                                    <span class="item-meta-li date">2025年12月15日</span>
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                                    <span class="item-meta-li date">2025年12月15日</span>
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                                 去除 []byte 中的 C 风格注释            </a>
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            <p>本文介绍了如何使用 Go 语言去除 byte 数组中的 C 风格注释(包括单行 // 和多行 /* */ 注释)。通过使用正则表达式,我们可以有效地从 JSON 文件或其他文本数据中移除这些注释,使其符合 JSON 规范,从而能够使用 json.Unmarshal 等函数进行解析。 JSON(Jav…</p>
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                                    <span class="item-meta-li date">2025年12月15日</span>
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                                    <span class="item-meta-li date">2025年12月15日</span>
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                                    <span class="item-meta-li date">2025年12月15日</span>
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                                    <span class="item-meta-li date">2025年12月15日</span>
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                                    <span class="item-meta-li date">2025年12月15日</span>
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