Log processing in the go language, using a log packet

Golang provides a native log library "log", which is easy to use and is described in code as an example.

Package Mainimport ("OS" "Log" "FMT") func main () {//open log File///The second parameter is open file mode, optional as follows:/* o_rdonly//Only Read mode Open file O_wronly//write-only mode open file O_rdwr//read-write mode open file O_append//write data append to file tail o_create//if not present     A new file will be created O_EXCL//and O_create together, the file must not exist O_sync//Open file for synchronous I/O o_trunc//If possible, empty the file when open */ The third parameter is file permissions, refer to Linux file permissions, 664 here for octal, for: rw-rw-r--logFile, err: = OS. OpenFile ("E:/go.log", OS. o_wronly | Os. O_create | Os. O_append, 0644) if err! = Nil {log. Fatal (ERR)}//The first parameter is output IO, which can be a file or an object that implements the interface, here is a log file, the second parameter is a custom prefix, the third parameter is the format option for the output log, and the optional combination///third parameter can be selected as follows:/* Ld             ate = 1//date: 2009/01/23 Ltime = 2//time: 01:23:23 lmicroseconds = 4        Microsecond resolution: 01:23:23.123123 (for enhanced ltime bit) Llongfile = 8//File full path name + line number:/a/b/c/d.go:23 Lshortfile = 16//File no path name + line number: d.go:23 (will overwrite llongfile) Lstdflags = Ldate | Ltime//Standard Logger initial value */debuglog: = log. New (LogFile, "[Debug]", log. Ldate|log. Ltime|log. llongfile)//Log output Debuglog.print ("Log test print output, processing with FMT. Print ") debuglog.println (" Log test Println output, processing with FMT. Println ") debuglog.printf (" Log test%s output, processing with FMT. printf "," printf ")//log output, while terminating the program directly, subsequent operations will not execute Debuglog.fatal (" Log test Fatal output, processing equivalent to: Debuglog.print (), then execute the OS. " Exit (1) ") Debuglog.fatalln (" Log test Fatalln output, processing equivalent to: Debuglog.println (), then execute OS. Exit (1) ") debuglog.fatalf (" Log test%s output, processing equivalent to: Debuglog.print (), then execute OS. ") Exit (1) "," fatalf ")//log output, while throwing an exception, available recover snap defer func () {if r: = Recover (); r! = nil {fmt. Println ("===========", R)}} () Debuglog.panic ("Log test Panic output, processing equivalent to: Debuglog.print (), then execute Panic ()") Debuglog. PANICLN ("Log test PANICLN output, processing equivalent to: Debuglog.println (), then execute panic ()") DEBUGLOG.PANICF ("Log test%s output, processing equivalent to: debuglog.printf () After that, execute panic () "," PANICF ") fmt. Println ("prefix:", Debuglog.prefix ())///prefix: [Debug] FMT. Println ("Output option is:", Debuglog.flags ())//Output options are: 11//Set prefix Debuglog.setprefix ("[INFO]")//Set OUTPUT option Debuglog.setflags (log. Lstdflags) fmt. Println ("prefix:", Debuglog.prefix ())///prefix: [INFO] FMT. Println ("Output option:", Debuglog.flags ())//Output option: 3}

Note: The above code executes when you want to fragment the comment, otherwise execute to:

debugLog.Fatal("日志测试Fatal输出，处理等价于：debugLog.Print()后，再执行os.Exit(1)")

Will terminate

Log processing in the go language, using a log packet