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NodeJS+Koa学习笔记(1-1)Node.js logger日志系统 - fs文件读写

  • 2026-05-13 15:26:25
NodeJS+Koa学习笔记(1-1)Node.js logger日志系统 - fs文件读写

Node.js logger日志系统 - fs文件读写

logger日志系统为实际功能,学习如何通过fs文件系统学习node.js有关文件系统的相关操作,在学习fs文件系统的同时,实现对node服务的运行日志进行存储

logger日志系统设计

主要作用于记录后端服务的调用日志记录,以中间件身份进行使用或函数方式手动调用

核心功能列举

  • • 1、日志中间件触发
  • • 2、子线程处理,预防高并发数据丢失
  • • 3、日志存储目录设计,有清晰结构树
  • • 4、writeLog函数,写日志value进txt文件
  • • 5、创建txt文件
  • • 6、删除txt文件
  • • 7、日、月切换自动补充目录与文件

日志存储目录结构

根据 config.js 的默认配置体系,生成的日志将遵循严谨的时间轴自动归档排列,如下树状图所示:

日志存储文件夹{LogPath}             # 根据包管理自适应的项目根目录└── log/                          # 顶层总日志文件夹 (LogName)    ├── 2026-04                   # 历史月份归档目录 (YYYY-MM)    │   ├── 2026-04-30(01).txt    # 每日日志分卷 1    │   └── 2026-04-30(02).txt    # 每日日志分卷 2 (因达到 100KB 大小限制触发自动切分)    └── 2026-05                   # 历史月份归档目录 (YYYY-MM)        ├── 2026-05-11(01).txt    # 每日日志分卷 1        └── 2026-05-12(02).txt    # 当前系统正处于活跃写入状态的最新日志文件

fs文件系统使用功能列举

  • • appendFileSync: 追加文件内容,文件不存在则创建
  • • mkdirSync: 创建目录,如果父目录不存在则一同创建
  • • existsSync: 检查文件或目录是否存在
  • • writeFileSync: 写入文件内容,文件不存在则创建,存在则覆盖
  • • unlinkSync: 删除文件,文件不存在则报错
  • • statSync: 获取文件或目录的状态,文件不存在则报错
  • • rmSync: 递归强制删除目录及其内部所有文件

1、创建文件

在日志系统中,当新一天的日志或日志分卷发生截断时,需要使用 fs.writeFileSync 同步创建新的 txt 文本。使用fs.existsSync 进行判断文件存在性,防止重复创建或覆盖已有文件

import fs from"node:fs";// 判断文件是否存在,不存在则创建并写入初始内容if (!fs.existsSync(filePath)) {  fs.writeFileSync(filePath, content || """utf-8");}

提示:本项目中,日常向文件追加日志主要使用 fs.appendFileSync,该方法自带“若不存在则自动创建文件”。

2、创建目录

日志的存储涉及按月份构建文件夹(例如:2026-05)。使用 fs.mkdirSync创建目录,并开启 recursive: true 配置来一次性创建缺失的多级连带目录。

import fs from"node:fs";// 递归创建所需的所有父级和目标目录结构if (!fs.existsSync(dirPath)) {  fs.mkdirSync(dirPath, { recursivetrue });}

3、删除文件

若需清除特定的过时日志或测试产生的日志文件,可使用 fs.unlinkSync它会同步从文件系统中删除指定的目标文件

import fs from"node:fs";// 删除单个文件。需提前验证文件是否存在,否则会抛出异常if (fs.existsSync(filePath)) {  fs.unlinkSync(filePath);}

4、删除目录

若需清理整个月份或测试子模块的嵌套目录结构,使用 fs.rmSync 方法

import fs from"node:fs";// 递归且强制删除目标目录及其中包含的所有嵌套文件与子目录if (fs.existsSync(dirPath)) {  fs.rmSync(dirPath, { recursivetrueforcetrue });}

参考文档

Node文件系统https://node.org.cn/docs/latest/api/fs.html#fsrmsyncpath-options

结语

本日志系统通过将上述的 fs文件系统 核心方法统一封装进 plugin/lee-logger 目录下相关文件内,实现了日志的写入、创建、删除等操作,便于通过txt文件查看服务运行日志。

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  1. CONNECT:[ UseTime:0.001290s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001995s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000810s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000708s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001359s ]
  6. SELECT * FROM `set` [ RunTime:0.000527s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001460s ]
  8. SELECT * FROM `article` WHERE `id` = 488388 LIMIT 1 [ RunTime:0.001373s ]
  9. UPDATE `article` SET `lasttime` = 1778676449 WHERE `id` = 488388 [ RunTime:0.001923s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000698s ]
  11. SELECT * FROM `article` WHERE `id` < 488388 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001245s ]
  12. SELECT * FROM `article` WHERE `id` > 488388 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008726s ]
  13. SELECT * FROM `article` WHERE `id` < 488388 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005389s ]
  14. SELECT * FROM `article` WHERE `id` < 488388 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002203s ]
  15. SELECT * FROM `article` WHERE `id` < 488388 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002087s ]
0.202721s