Golang初级项目中日志轮转与管理实现

log

lumberjack

io.Writer

log

zap

go get gopkg.in/natefinch/lumberjack.v2

package main

import (
    "log"
    "gopkg.in/natefinch/lumberjack.v2"
)

func main() {
    // 配置 lumberjack 作为日志写入器
    logger := &lumberjack.Logger{
        Filename:   "logs/app.log",        // 日志文件路径
        MaxSize:    10,                    // 每个日志文件最大 10MB
        MaxBackups: 5,                     // 最多保留 5 个旧文件
        MaxAge:     7,                     // 文件最多保存 7 天
        Compress:   true,                  // 启用 gzip 压缩旧日志
    }

    defer logger.Close()

    // 设置标准 log 输出到 lumberjack
    log.SetOutput(logger)

    // 模拟写入日志
    for i := 0; i < 1000; i++ {
        log.Printf("这是第 %d 条日志", i)
    }
}

app.log

lumberjack

app.log.1

app.log

uber-go/zap

lumberjack

package main

import (
    "gopkg.in/natefinch/lumberjack.v2"
    "go.uber.org/zap"
    "go.uber.org/zap/zapcore"
)

func main() {
    // 配置 lumberjack
    writeSyncer := zapcore.AddSync(&lumberjack.Logger{
        Filename:   "logs/app_structured.log",
        MaxSize:    10,
        MaxBackups: 5,
        MaxAge:     7,
        Compress:   true,
    })

    // 构建 zap 日志核心
    encoderCfg := zap.NewProductionEncoderConfig()
    encoderCfg.TimeKey = "ts"
    encoderCfg.EncodeTime = zapcore.ISO8601TimeEncoder

    core := zapcore.NewCore(
        zapcore.NewJSONEncoder(encoderCfg),
        writeSyncer,
        zap.InfoLevel,
    )

    logger := zap.New(core)
    defer logger.Sync()

    // 写入结构化日志
    logger.Info("用户登录", zap.String("user", "alice"), zap.String("ip", "192.168.1.100"))
}

import "os"

func ensureLogDir() {
    if err := os.MkdirAll("logs", 0755); err != nil {
        log.Fatal("无法创建日志目录:", err)
    }
}

ensureLogDir()

lumberjack

log

zap