英文:
How to change the date/time format of Go's log package
问题
使用log包时，Go语言会输出类似以下格式的内容：
2009/11/10 23:00:00 Hello, world
我该如何将日期和时间格式更改为类似于 dd.mm.yyy hh:mm:ss 的格式？以下是一个示例（playground链接）：
package main
import "log"
func main() {
log.Println("Hello, playground")
}
英文:
When using the log package, Go outputs something like
2009/11/10 23:00:00 Hello, world
How can I change the date and time format to something like dd.mm.yyy hh:mm:ss? Example (playground link):
package main
import "log"
func main() {
log.Println("Hello, playground")
}
答案1
得分: 63
像yed posterior所说的那样，你可以通过实现一个write函数来定义一个自定义的io.Writer。你可能还想执行log.SetFlags(0)来完全控制日志输出。下面是一个示例，它改变了日期格式，并添加了一些日志级别信息。
type logWriter struct {
}
func (writer logWriter) Write(bytes []byte) (int, error) {
return fmt.Print(time.Now().UTC().Format("2006-01-02T15:04:05.999Z") + " [DEBUG] " + string(bytes))
}
func main() {
log.SetFlags(0)
log.SetOutput(new(logWriter))
log.Println("This is something being logged!")
}
输出结果为：
2016-03-21T19:54:28.563Z [DEBUG] This is something being logged!
英文:
Like yed posterior said, you can define a custom io.Writer by implementing a write function. You'll also probably want to do a log.SetFlags(0) to take full control. Here's an example that changes the date format as well as adds some log level info.
type logWriter struct {
}
func (writer logWriter) Write(bytes []byte) (int, error) {
return fmt.Print(time.Now().UTC().Format("2006-01-02T15:04:05.999Z") + " [DEBUG] " + string(bytes))
}
func main() {
log.SetFlags(0)
log.SetOutput(new(logWriter))
log.Println("This is something being logged!")
}
outputs:
2016-03-21T19:54:28.563Z [DEBUG] This is something being logged!
答案2
得分: 6
根据来源（http://golang.org/src/pkg/log/log.go），没有内置的方法来实现这一点：
26 // 用于控制打印的位或操作。无法控制它们出现的顺序（在此处列出的顺序）或它们的格式（如注释中所述）。这些项目后面会有一个冒号：
29 // 2009/01/23 01:23:23.123123 /a/b/c/d.go:23: message
你需要使用第三方包来实现，或者像yed描述的那样拦截日志输出。
英文:
According to the source (http://golang.org/src/pkg/log/log.go) there is no built-in way to do that:
26 // Bits or'ed together to control what's printed. There is no control over the
27 // order they appear (the order listed here) or the format they present (as
28 // described in the comments). A colon appears after these items:
29 // 2009/01/23 01:23:23.123123 /a/b/c/d.go:23: message
You'll need to use a 3rd party package for that, or intercept the log output as yed described.
答案3
得分: 5
使用自定义的写入器来过滤日志行并将其修改为所需的格式。这应该很容易，因为标题的格式是规则的且固定宽度的。然后调用log.SetOutput(myFilterWriter(os.Stderr))。
英文:
Use a custom writer that filters the log lines to modify them to the format you need. It should be easy because the format of the header is regular and fixed-width. Then call log.SetOutput(myFilterWriter(os.Stderr)).
答案4
得分: 0
使用Logger系统内部的标志更容易。
log.SetFlags(log.Lmicroseconds)
使用此标志将时间戳添加到日志中，精确到微秒。
其他可用选项包括：
const (
Ldate = 1 << iota // 本地时区的日期：2009/01/23
Ltime // 本地时区的时间：01:23:23
Lmicroseconds // 微秒分辨率：01:23:23.123123。假设Ltime。
Llongfile // 完整的文件名和行号：/a/b/c/d.go:23
Lshortfile // 最终文件名元素和行号：d.go:23。覆盖Llongfile
LUTC // 如果设置了Ldate或Ltime，则使用UTC而不是本地时区
Lmsgprefix // 将“前缀”从行的开头移到消息之前
LstdFlags = Ldate | Ltime // 标准记录器的初始值
)
Golang记录器文档可在此处找到。
英文:
It's much easier to use the flags from Logger system internal.
log.SetFlags(log.Lmicroseconds)
Use this flag to add timestamp with microseconds to the log.
Other available options are :
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
Lmsgprefix // move the "prefix" from the beginning of the line to before the message
LstdFlags = Ldate | Ltime // initial values for the standard logger
)
Golang logger documentation is available here
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