drcrc28428 2018-12-10 15:21
浏览 58
已采纳

通过Golang记录器写日志

I am trying to write log by using log.Logger, my code is like bellow. I don't understand why my log can be written using Error inside initLog function but in main function it can't be written to the log file.
Can anybody explain for me?
Thanks.

package main

import (
    "log"
    "net/http"
    "os"
)

const (
    PORT = ":8081"
)

var (
    Error *log.Logger
)

func initLog() {
    errorFile, err := os.OpenFile("error.log", os.O_RDWR|os.O_APPEND, 0660)
    defer errorFile.Close()

    if err != nil {
        log.Fatal(err)
    }

    Error = log.New(errorFile, "ERROR: ", log.Ldate|log.Ltime)
    Error.SetOutput(errorFile)
    Error.Println("Log error will be written into error.log")

}

func main() {
    initLog()
    Error.Println("Test write log")
    http.ListenAndServe(PORT, http.FileServer(http.Dir('.')))
}
  • 写回答

2条回答 默认 最新

  • dongxie2749 2018-12-10 15:29
    关注

    You're closing the file when returning from initLog() using defer errorFile.Close() so inside main() the file errorFile is closed.

    So comment this line:

    defer errorFile.Close()
    

    And move it to the main().

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
查看更多回答(1条)

报告相同问题?

悬赏问题

  • ¥15 jupyterthemes 设置完毕后没有效果
  • ¥15 matlab图像高斯低通滤波
  • ¥15 针对曲面部件的制孔路径规划,大家有什么思路吗
  • ¥15 钢筋实图交点识别,机器视觉代码
  • ¥15 如何在Linux系统中,但是在window系统上idea里面可以正常运行?(相关搜索:jar包)
  • ¥50 400g qsfp 光模块iphy方案
  • ¥15 两块ADC0804用proteus仿真时,出现异常
  • ¥15 关于风控系统,如何去选择
  • ¥15 这款软件是什么?需要能满足我的需求
  • ¥15 SpringSecurityOauth2登陆前后request不一致