golang package log
发布时间:2020-12-16 09:30:11 所属栏目:大数据 来源:网络整理
导读:package mainimport ( "log" "os")var logger *log.Loggerfunc main() { file,err := os.OpenFile("test.log",os.O_APPEND|os.O_CREATE,666) if err != nil { log.Fatalln("fail to create test.log file!") } defer file.Close() logger = log.New(file,"",
package main import ( "log" "os" ) var logger *log.Logger func main() { file,err := os.OpenFile("test.log",os.O_APPEND|os.O_CREATE,666) if err != nil { log.Fatalln("fail to create test.log file!") } defer file.Close() logger = log.New(file,"",log.LstdFlags|log.Lshortfile) // 日志文件格式:log包含时间及文件行数 log.Println("输出日志到命令行终端") logger.Println("将日志写入文件") logger.SetFlags(log.LstdFlags | log.Lshortfile) // 设置日志格式 log.Panicln("在命令行终端输出panic,并中断程序执行") logger.Panicln("在日志文件中写入panic,并中断程序执行") log.Fatal("在命令行终端输出日志并执行os.exit(1)") logger.Fatal("在日志文件中写入日志并执行os.exit(1)") } Logger结构体所有字段都是私有的,提供了一个工厂函数获取结构体实例 // New creates a new Logger. The out variable sets the // destination to which log data will be written. // The prefix appears at the beginning of each generated log line. // The flag argument defines the logging properties. func New(out io.Writer,prefix string,flag int) *Logger { return &Logger{out: out,prefix: prefix,flag: flag} } flag参数的常量 const ( Ldate = 1 << iota // the date in the local time zone: 2009/01/23 Ltime // the time in the local time zone: 01:23:23 Lmicroseconds // microsecond resolution: 01:23:23.123123. assumes Ltime. Llongfile // full file name and line number: /a/b/c/d.go:23 Lshortfile // final file name element and line number: d.go:23. overrides Llongfile LUTC // if Ldate or Ltime is set,use UTC rather than the local time zone LstdFlags = Ldate | Ltime // initial values for the standard logger ) (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |
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