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在java、.net平台有非常有名的日志类，golang 也有对应的版本
安装： go get github.com/alecthomas/log4go
type Level int const ( FINEST Level = iota FINE DEBUG TRACE INFO WARNING ERROR CRITICAL )
可以看到作者定义了一个 Level 类型来定义日志级别，使用的时候注意。
1. ConsoleLogWriter ：控制台输出日志
logger1 := log4go.Logger{} logger1.AddFilter("logger1", log4go.INFO, log4go.NewConsoleLogWriter()) logger1.Log(log4go.INFO, "logger1:", "hello log4go")
2. FileLogWriter ：文件输出日志
logger3 := log4go.Logger{} logger3.AddFilter("logger3", log4go.ERROR, log4go.NewFileLogWriter("file.log", false)) logger3.Log(log4go.ERROR, "logger3:", "hello log4go")
3. FormatLogWriter : 格式化输出日志
format 解释：
Known format codes: %T - Time (15:04:05 MST) %t - Time (15:04) %D - Date (2006/01/02) %d - Date (01/02/06) %L - Level (FNST, FINE, DEBG, TRAC, WARN, EROR, CRIT) %S - Source %M - Message Ignores unknown formats
Recommended: "[%D %T] [%L] (%S) %M"
logger2 := log4go.Logger{} std := os.Stdout logger2.AddFilter("logger2", log4go.DEBUG, log4go.NewFormatLogWriter(std, "[%D %T] [%L] (%S) %M")) logger2.Log(log4go.DEBUG, "logger2:", "hello log4go")
额… 这个等用到再补吧
5. NewXMLLogWriter : xml格式输出日志
logger4 := log4go.Logger{} logger4.AddFilter("logger4", log4go.ERROR, log4go.NewXMLLogWriter("file.xml", true))
logger4.Log(log4go.ERROR, "logger4:", "hello log4go")
<log created="2016/02/02 14:17:10 CST"> <record level="EROR"> <timestamp>2016/02/02 14:17:10 CST</timestamp> <source>logger4:</source> <message>hello log4go</message> </record>
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原文地址：http://www.cnblogs.com/loveyx/p/5177531.html
