log4j

log4j：能夠輸出日誌到控制檯或文件。

 

1、導入包：log4j

2、新建src/log4j.properties文件：

• #set log level and output place
• log4j.rootLogger = debug,stdout,D
• log4j.appender.stdout = org.apache.log4j.ConsoleAppender
• log4j.appender.stdout.Target = System.out
• log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
• log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n
• log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
• log4j.appender.D.File = log.log
• log4j.appender.D.Append = true
• log4j.appender.D.Threshold = DEBUG
• log4j.appender.D.layout = org.apache.log4j.PatternLayout
• log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

3、使用log4j：

• Logger log=Logger.getLogger(Test.class);
• log.debug("this is a 測試");

4、在mybatis中開啓log4j：

• <configuration>
•        <settings>
•               <setting name="logImpl" value="log4j"/>
•        </settings>

5、log4j.propertie控制輸出內容：

• log4j.rootLogger = error,stdout,D
• log4j.logger.com.mybatis=debug    (只輸出com.mybatis中的日誌)