package main

import (
    "log"
    "bytes"
    "fmt"
    "os"
"github.com/astaxie/beego/logs"
)

func main() {

    //1.日志寫入一段緩存里
    var buf bytes.Buffer
    logger := log.New(&buf, "logger: ", log.Llongfile)//三個參數(shù)對應(yīng)輸出對象，前綴，文件名然后整合成前綴
    logger.Print("Hello, log file!") //實際log信息
    fmt.Println(&buf)

    //2.日志寫入一段文件里,執(zhí)行完刷新工程，會有文件debug.log打開來看
    fileName := "debug.log"  //在工程路徑下和src同級，也可以寫絕對路徑，不過要注意轉(zhuǎn)義符
    logFile,err  := os.Create(fileName)  //創(chuàng)建該文件，返回句柄
    defer logFile.Close()      //確保文件在該函數(shù)執(zhí)行完以后關(guān)閉
    if err != nil {  
        log.Fatalln("open file error !")  
    }  

    //庫里的log包不存在級別，只有Print，F(xiàn)atal，Panic三種，想要7種級別，可以用syslog包或者框架
    debugLog := log.New(logFile,"",log.Llongfile)  
    debugLog.Print("找到一個低級bug,低級別的日志報告，執(zhí)行debug記錄后繼續(xù)執(zhí)行")
    debugLog.Fatal("發(fā)現(xiàn)一個嚴(yán)重bug，日志已記錄，程序在此終止")
    debugLog.Panic("哎呀，我沒有被執(zhí)行，好慘")

    //3.使用beego框架的log包進(jìn)行l(wèi)og處理 ，對應(yīng)7種級別
    logInstance:=logs.GetLogger()
    logInstance.Println("this is a message of http")
    //an official log.Logger with prefix ORM
    logs.GetLogger("ORM").Println("this is a message of orm")
    logs.Debug("my book is bought in the year of ", 2016)
    logs.Info("this %s cat is %v years old", "yellow", 3)
    logs.Warn("json is a type of kv like", map[string]int{"key": 2016})
    logs.Error(1024, "is a very", "good game")
    logs.Critical("oh,crash")
    logs.Notice("fuck")
    logs.Alert("alert")
    logs.Emergency("emergency")

}

package main

import (
    "os"
    "log"
)



func main() {
    file, err := os.OpenFile("./testLog/test.log",  os.O_CREATE | os.O_WRONLY | os.O_APPEND,os.ModePerm)
    if err != nil {
        log.Fatalln(err)
    }
    logger := log.New(file, "", log.LstdFlags|log.Llongfile)
    logger.Println("日志1.")
    logger.Println("日志23")
}