logback

 

转载自：http://yuri-liuyu.iteye.com/blog/954038。仅供学习，谢谢原文作者

 

首先介绍下logback的前世今生。

 

slf4j由log4j作者Ceki开发，逐步取代apahce commons logging。

logback由log4j作者Ceki开发，逐步取代log4j。

slf4j等于commons-logging，是各种日志实现的通用入口，会根据classpath中存在下面哪一个Jar来决定具体的日志实现库。

 

logback相比较log4j的优势

slf4j支持参数化的logger.error("帐号ID：{}不存在", userId);

告别了if(logger.isDebugEnable()) 时代。

另外logback的整体性能比log4j也较佳，hibernate等项目已经采用了slf4j。

 

要在工程里面使用logback需要以下jar文件：

 

slf4j-api-1.6.1.jar

官网网址：http://www.slf4j.org/

下载地址：http://www.slf4j.org/dist/slf4j-1.6.1.zip

 

logback-access-0.9.29.jar

logback-classic-0.9.29.jar

logback-core-0.9.29.jar

官网网址：http://logback.qos.ch/

下载地址：http://logback.qos.ch/dist/logback-0.9.29.zip

 

 

slf4j和logback的使用

1.如果日志的参数超过3个，需要写成

 

 

Object[] params = {newVal, below, above};
logger.debug("Value {} was inserted between {} and {}.", params);

 

2.因为内部已优化，作者认为slf4j的logger不需要定义为static。

3.可设置缓存后批量写日志文件(但服务器如果重启，可能会丢失未写到磁盘的记录)

4.MDC，用Filter，将当前用户名等业务信息放入MDC中，在日志format定义中即可使用该变量。

5.JMS Appender用于告警, DB Appender用于业务日志等可以使用插件，如生成Log代码的Eclipse插件Log4E。

6.tomcat和glassfish中，设定日志路径为../logs/xxxx.log 都能将日志放入应用服务器本身的logs目录。

 

最后把最近完善的一个logback.xml贴上，毕竟实际项目中的文件最能说明问题。

 

 

<?xml version="1.0" encoding="UTF-8"?>

<configuration>
    <substitutionProperty name="log.base" value="d:\\logback\\logback" />
    <jmxConfigurator />
    <appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
        <filter class="ch.qos.logback.core.filter.EvaluatorFilter">
            <evaluator name="myEval">
                <expression>message.contains("dao")</expression>
            </evaluator>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <layout class="ch.qos.logback.classic.PatternLayout">
            <pattern>%date [%thread] %-5level %logger{80} - %msg%n</pattern>
        </layout>
    </appender>
    <appender name="logfile-dao"
        class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.core.filter.EvaluatorFilter">
            <evaluator name="myEval_dao">
                <expression>message.contains("dao")</expression>
            </evaluator>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <Encoding>UTF-8</Encoding>
        <File>${log.base}_dao.log</File>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>${log.base}.%d{yyyy-MM-dd}_dao.log.zip
            </FileNamePattern>
        </rollingPolicy>
        <layout class="ch.qos.logback.classic.PatternLayout">
            <pattern>%date [%thread] %-5level %logger{80} - %msg%n</pattern>
        </layout>
    </appender>
    <appender name="logfile-service"
        class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.core.filter.EvaluatorFilter">
            <evaluator name="myEval_service">
                <expression>message.contains("service.impl")</expression>
            </evaluator>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <Encoding>UTF-8</Encoding>
        <File>${log.base}_service.log</File>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>${log.base}.%d{yyyy-MM-dd}_service.log.zip
            </FileNamePattern>
        </rollingPolicy>
        <layout class="ch.qos.logback.classic.PatternLayout">
            <pattern>%date [%thread] %-5level %logger{80} - %msg%n</pattern>
        </layout>
    </appender>
    <appender name="jms_dao" class="ch.qos.logback.classic.net.JMSQueueAppender">
        <InitialContextFactoryName>
            org.apache.activemq.jndi.ActiveMQInitialContextFactory
        </InitialContextFactoryName>
        <ProviderURL>tcp://192.168.1.120:61616</ProviderURL>
        <filter class="ch.qos.logback.core.filter.EvaluatorFilter">
            <evaluator name="myEval_service">
                <expression>message.contains("dao")</expression>
            </evaluator>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <QueueConnectionFactoryBindingName>ConnectionFactory
        </QueueConnectionFactoryBindingName>
        <QueueBindingName>cms_dao_log</QueueBindingName>
    </appender>
    <appender name="jms_service" class="ch.qos.logback.classic.net.JMSQueueAppender">
        <InitialContextFactoryName>
            org.apache.activemq.jndi.ActiveMQInitialContextFactory
        </InitialContextFactoryName>
        <ProviderURL>tcp://192.168.1.120:61616</ProviderURL>
        <filter class="ch.qos.logback.core.filter.EvaluatorFilter">
            <evaluator name="myEval_service">
                <expression>message.contains("service.impl")</expression>
            </evaluator>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <QueueConnectionFactoryBindingName>ConnectionFactory
        </QueueConnectionFactoryBindingName>
        <QueueBindingName>cms_service_log</QueueBindingName>
    </appender>
    <logger name="com.cms5.cmsservice.jms">
        <level value="DEBUG" />
    </logger>
    <logger name="java.sql.PreparedStatement">
        <level value="DEBUG" />
    </logger>
    <logger name="java.sql.Connection">
        <level value="DEBUG" />
    </logger>
    <logger name="java.sql.Statement">
        <level value="DEBUG" />
    </logger>
    <logger name="com.ibatis">
        <level value="DEBUG" />
    </logger>
    <logger name="com.ibatis.common.jdbc.SimpleDataSource">
        <level value="DEBUG" />
    </logger>
    <logger name="com.ibatis.common.jdbc.ScriptRunner">
        <level value="DEBUG" />
    </logger>
    <logger name="com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate">
        <level value="DEBUG" />
    </logger>
    <logger name="com.danga.MemCached">
        <level value="INFO" />
    </logger>
    <logger name="org.springframework.test">
        <level value="DEBUG" />
    </logger>
    <logger name="org.apache.struts2">
        <level value="DEBUG" />
    </logger>
    <root>
        <level value="INFO" />
        <!--<appender-ref ref="stdout" />
        -->
        <appender-ref ref="logfile-dao" />
        <appender-ref ref="logfile-service" />
        <appender-ref ref="jms_dao" />
        <appender-ref ref="jms_service" />
    </root>
</configuration>