精通Go语言日志记录高效日志管理

package main
import (
    "log"
    "os"
)
func main() {
    // 创建日志输出文件
    file, err := os.OpenFile("app.log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
    if err != nil {
        log.Fatal("Failed to open log file: ", err)
    }
    defer file.Close()
    // 设置日志输出目标
    log.SetOutput(file)
    // 记录日志
    log.Println("This is a test log entry")
}

go get github.com/sirupsen/logrus

package main
import (
    "github.com/sirupsen/logrus"
    "os"
)
func main() {
    log := logrus.New()
    log.Out = os.Stdout
    // 设置日志格式为 JSON
    log.SetFormatter(&logrus.JSONFormatter{})
    // 记录一条消息
    log.WithFields(logrus.Fields{
        "username": "admin",
        "module":   "booking",
    }).Info("User accessed booking module")
}

package main
import "go.uber.org/zap"
func main() {
    logger, _ := zap.NewProduction()
    defer logger.Sync() // flushes buffer, if any
    sugar := logger.Sugar()
    sugar.Infow("failed to fetch URL",
        // 结构化的上下文信息
        "url", "http://example.com",
        "attempt", 3,
        "backoff", time.Second,
    )
    sugar.Infof("Failed to fetch URL: %s", "http://example.com")
}